Abstract: An active damping system for use in connection with a vibration isolation system is provided. The active damping system having an actuator for placement on the ground, and an intermediate mass supported on the actuator for acting as a stability point to which dynamic forces can be dampened and isolated from the payload. The active damping system also includes a passive damping element and a support spring, both coupled at one end to a payload and at an opposite end to the intermediate mass. At least one offload spring can be situated between the intermediate mass and the ground for partially supporting any weight from the payload acting on the actuator. A sensor can also be affixed to the intermediate mass to generate a feedback signal to the actuator for subsequent acting on the intermediate mass to permit the intermediate mass to act as a stability point. A system and method for isolating dynamic forces using such an active damper is also provided.

Abstract: A method and an arrangement for dampening vibration in a mast structure of a mast truck where the critical characteristics of the mast structure and/or of the vibration are measured, computed, measured and computed or at least some of the characteristics are fed to the computing system in advance, the lowest natural frequency (?n) of the mast structure and/or the phase of the vibration is computed from the collected data or determined directly from the mast structure, the order for movement is obtained from driver or master system, the critical characteristics are fed to the computing system, the movement guidance to the speed controller is generated from above mentioned characteristics of the vibration, the order for movement is divided at least two parts (impulses I), and the actuator is controlled with speed controller for moving the truck or load in the truck according to the order for movement.

Abstract: A rotary table mounting and drive device (1), including a rotary table (3) which is rotatably mounted on a frame (2) and for the mounting of which an axial/radial rolling bearing arrangement (4) and an active magnetic bearing arrangement (5) are provided, has an electric direct drive (19) which is preferably a torque motor having a rotor (20) rigidly connected to the rotary table (3) and a stator (21) rigidly connected to the frame (2).

Abstract: A system for balancing an aircraft propeller system receives a vibration signal from the aircraft propeller system and determines whether the vibration signal indicates a transient vibration condition. If it is determined that the vibration signal does not indicate a transient condition, the system enables a balance correction controller. The controller generates a balance correction signal based on the vibration signal, and balances the aircraft propeller system in response to the balance correction signal if the balance correction controller is enabled.

Abstract: An process device for use in an industrial process control or monitoring system is configured to couple to a process. A vibration sensor is configured to sense vibrations. Diagnostic circuitry provides a diagnostic output based upon the sensed vibrations.

Abstract: A method of damping tower oscillation in a wind turbine is provided. The method includes the steps of determining a rotor rotational speed of the wind turbine and controlling the rotor rotational speed such that a critical rotor speed is avoided, characterized in that it further comprises the following steps: selecting at least one input parameter value; selecting, according to the input parameter value, an operation mode for controlling the rotor rotational speed, wherein the operation mode is selected from a set of modes comprising a mode of auto tune operation; on the condition of the selected operation mode comprising the mode of auto tune operation, performing the following steps: detecting the tower oscillation frequency; calculating the critical rotor speed based on the detected tower oscillation frequency and controlling the rotor rotational speed to avoid the calculated critical rotor speed. An apparatus and a computer program product are also provided.

Abstract: Methods and apparatus for isolation system according to various aspects of the present invention comprise a plurality of elastic elements disposed in one or more planes between an equipment body and a mounting structure and are not symmetric about the center of gravity of the equipment body. The isolation system is configured to modally decouple vibration along one axis from other axes of vibration and provide an isoelastic mounting system in up to all six degrees of freedom.

Abstract: A method and a device for robust rejection of the periodic disturbances in a motor-position control structure of the RST type, wherein the assembly including the motor, the position sensor, the element for computing the functions 1/So(z?1) and Ro(z?1), in a loop, is called central controller. Within the framework of the invention, to the central controller are added two additional computing elements, the first one being an estimator block E(z?1) and the second one a modifier block Q(z?1), as well as an additional loop, the estimator block E(z?1) allowing a load disturbance estimation signal {circumflex over (v)}(t) to be computed, the modifier block Q(z?1) receiving the load disturbance estimation signal {circumflex over (v)}(t) as an input, to produce a modified signal, which is applied to a negative input of an additional adder arranged upstream from the element for computing the function 1/So(z?1) and then forming the additional loop, the modifier block having a variable transfer function.

Abstract: A method of the invention is for controlling an MR-fluid hydraulic mount connected to a vehicle engine. The mount includes an internal MR-fluid cavity. The mount includes a partition plate assembly partitioning the cavity into first and second MR-fluid chambers. The partition plate assembly has an orifice extending from the first MR-fluid chamber to the second MR-fluid chamber. The mount includes an electric coil positioned to magnetically influence the orifice. The method includes, when the vehicle engine is at idle, determining a reference pressure as a fluid pressure within the second MR-fluid chamber. The method includes, when the vehicle engine is above idle, determining a command electric current to be applied to the electric coil using at least a difference between the reference pressure and a current fluid pressure within the second MR-fluid chamber. The method includes applying the command electric output current to the electric coil.

Abstract: A method for vibration avoidance in automated machinery produces actuator space-time contours that meet design objectives of the machinery while suppressing energy content at frequencies in the space-time contour, by concatenating multiple space-time contour segments together in such a way as to be mostly free of energy at the frequencies of interest while meeting other specified design goals. The segments used to construct these frequency-optimized-contours are a series of concatenated polynomial segments, the independent variable t being time. These segments can define the variable to be controlled (e.g. speed or distance) versus time, or define one of the controlled variable's time-derivatives (e.g., the slope of the speed vs. time, etc.).

Abstract: An aircraft with at least one rotating machine creating troublesome vibrations, the aircraft comprised of an aerostructure, the aircraft including: a power source, the power source outputting a plurality of electromagnetic force generator power outputs, the aerostructure including a plurality of distributed active vibration control system sites, at least a first distributed active vibration electromagnetic force generator, the first distributed active vibration electromagnetic force generator including a first distributed electronic control system and a first electromagnetically driven mass, the first distributed active vibration electromagnetic force generator fixed to the aerostructure at a first distributed active vibration control system site, at least a second distributed active vibration electromagnetic force generator, the second distributed active vibration electromagnetic force generator including a second distributed electronic control system and a second electromagnetically driven mass, the seco

Abstract: An apparatus (7) for reduction of vibrations of a structure (1) has a vibration sensor (8) which is arranged in a structure (1), an actuator (11) which acts on the structure, and a control system (9) which drives the actuator (11) as a function of a signal (10) from the vibration sensor (8). The control system (9) itself has an electrical resonant circuit (14), which defines the profile of a transfer function of the control system (9) between the signal (10) from the vibration sensor (8) and the drive (12) of the actuator (11).

Abstract: A shock detection circuit housed in an electronic device includes an output shock signal that is indicative of vibration amplitude. To compensate for vibrations that are experienced by the electronic device, the output shock signal is analyzed. The analysis of the output shock signal allows a vibration frequency of the output shock signal to be identified and used in vibration compensation.

Abstract: The present application provides for apparatuses and methods for monitoring steam turbine valve assemblies. In one embodiment of the present application a method for monitoring valve assemblies is provided. First, the vibration characteristics of at least one valve assembly prior to operation may be measured. Next, the behavior of that valve assembly may be monitored during operation of the valve assembly, then compared to the vibration characteristics determined prior to operation. Comparing the valve assembly behavior monitored during operation to the valve assembly characteristics measured prior to operation may allow for estimating the stress levels experienced by the valve assembly during operation.

Abstract: A vibration control system and a method for controlling vibration in a material surface are disclosed, wherein the vibration control system provides a desired motion of the material surface while militating against any undesirable motion of the surface. The vibration control system includes a sensor disposed adjacent a material surface having a first set of dynamic vibration properties, a displacement generating device disposed adjacent the material surface adapted to generate a localized motion in the material surface, and a controller adapted to receive an input signal from the sensor and transmit a control signal to the displacement generating device thereby controlling the localized motion in the material surface.

Abstract: A vibration suppressor system includes an annular electric motor system which independently controls rotation of at least two masses about the axis of rotation to reduce in-plane vibration of the rotating system. A method of reducing vibrations in a rotary-wing aircraft includes independently controlling a relative angular position of a multiple of independently rotatable masses to reduce vibrations of a main rotor system.

Abstract: The present invention discloses a method and device for suppressing vibration of boom of concrete pump truck, in which the boom cylinder is connected with the vibration suppression cylinder; the information about hydraulic pressure in the boom cylinder and/or about changing of concrete pumping direction is monitored by a pressure sensing unit in real time; the monitored information about hydraulic pressure and/or about changing of concrete pumping direction is transmitted to the control unit for vibration suppression cylinder; the control unit for vibration suppression cylinder analyzes and processes the monitored information and adjusts the volumes of the rod side chamber and the non-rod side chamber in the vibration suppression cylinder such that the vibration suppression cylinder may generate a pulsed vibration and the pulsed vibration at the end of the boom is less than or equal to the vibration amplitude caused by the intermittent concrete supply at the end of the boom in amplitude, with a phase differen

Abstract: A method for vibration avoidance in automated machinery produces actuator space-time contours that meet design objectives of the machinery while suppressing energy content at frequencies in the space-time contour, by concatenating multiple space-time contour segments together in such a way as to be mostly free of energy at the frequencies of interest while meeting other specified design goals. The segments used to construct these frequency-optimized-contours are a series of concatenated polynomial segments, the independent variable t being time. These segments can define the variable to be controlled (e.g. speed or distance) versus time, or define one of the controlled variable's time-derivatives (e.g., the slope of the speed vs. time, etc.).

Abstract: A civil engineering damper for damping civil engineered structures comprising a damper housing including two dynamic fluid chambers within a piston cylinder and two static fluid chambers straddling the dynamic fluid chambers along an axis of the housing a piston mounted for reciprocation along the axis of the damper housing. A piston web portion divides the piston cylinder into the two dynamic fluid chamber. A restricted passageway through the piston web portion includes an orifice that provides a resistance to fluid flow between the dynamic fluid chambers. The damper also includes regulated passageways between adjacent dynamic and static fluid chambers valved to allow a flow of fluid from the static fluid chambers to the dynamic fluid chambers and check flows of fluid from the dynamic fluid chambers to the static fluid chambers.

Abstract: This invention relates to a control unit for an unbalanced mass adjusting device in a vibration generator, in particular in a soil compaction machine, having an adjusting cylinder which is hydraulically adjustable to adjust a relative position of contrarotating unbalanced masses in the vibration generator, having a control valve to adjust the adjusting cylinder so that the vibration behavior of the vibration generator is adjusted and having a control unit for triggering the control valve according to a pulse width modulation signal to adjust the relative position of the unbalanced masses as a function of the pulse duty factor of the pulse width modulation signal.

Abstract: A method and an apparatus for determining cooling fan speeds that should be avoided to prevent vibational resonance with system enclosures, given ambient conditions, and/or current geographic altitude. An exemplary method to determine one or more ranges of fan speed for one or more cooling fans in a chassis with one or more systems to avoid vibrational resonance in the chassis caused by the one or more cooling fans is provided. The method includes determining a range of operable fan speed for the one or more cooling fans that meets the cooling goal of the one or more systems in the chassis, wherein the one or more cooling fans are used to cool the chassis, and the one or more systems. The method also includes scanning fan speed for the one or more cooling fans over the determined range of operable fan speed, and collecting and analyzing read or write rates on a hard disk drive in the one or more systems over the determined range of operable fan speed.

Abstract: The item-carrying system comprises: a robot comprising: a gripping portion for gripping an item; external force detecting means for detecting an external force applied to the gripping portion; opening-degree detecting means for detecting an opening-degree of the gripping portion; autonomous movement means; and receiving/passing motion deciding means for deciding a motion of the robot in an item receiving/passing operation, wherein the receiving/passing motion deciding means comprises: means for determining to start receiving an item that causes the gripping portion to start a receiving motion if the external force detecting means has detected an external force not less than a first predetermined value, when the gripping portion is not gripping an item; and means for determining the completion of a receiving motion on the basis of at least one of an external force and an opening-degree during the receiving motion.

Abstract: A system for damping audible noise from a drive train. One embodiment is a system with an audible noise signal from a drive train wherein a damping circuit produces a damping torque that is a phase shifted and amplified version of the noise signal that is applied to the air-gap torque of a generator or motor coupled to the drive train and effectively reduces the audible noise.

Abstract: Disclosed are a method and a device for suppressing vibrations (18) in an installation comprising an actuator (14) for actuating a flap (12) or a valve (70) used for metering a gas or liquid volume flow (16), especially in the area of HVAC, fire protection, or smoke protection. Vibrations (18) of the flap (12) or valve (70) caused by an unfavorable or wrong adjustment or configuration of the controller and/or by disruptive influences are detected and dampened or suppressed by means of an algorithm (1) that is stored in a microprocessor (49). Said algorithm is preferably based on the components recognition of vibrations (46), adaptive filtering (48), and recognition of sudden load variations (50).

Abstract: A heat source side controller of an air conditioner has an operating mode allocator and an operating mode setter. The air conditioner has a heat source unit and a plurality of room units. The heat source unit can be switched among a plurality of operating modes having different noise-reduction levels. The operating mode allocator allocates one operating mode to each of the operating room units. The operating mode setter sets the heat source unit to one operating mode from among the plurality of operating modes on the basis of the operating modes allocated by the operating mode allocator to each of the operating room units. In cases in which a specific operating mode is allocated to all of the operating room units, the operating mode setter sets the heat source unit to the specific operating mode.

Abstract: The aim of the method of controlling at least one mechanical system exhibiting at least one flexible structure element and at least one actuator or group of actuators is to reduce the level of vibrations of said element while controlling the actuator or group of actuators in such a way as to achieve at least one objective assigned to the mechanical system. The control consists of increments having to be carried out at a sampling period T, each of the increments being constant in amplitude in a sampling time interval extending between two successive sampling instants and each of the increments being applied during a duration which is less than or equal to the sampling period T. In each sampling interval, at least one of the initial and final instants of application of the increment is modified by adding a variable, random or pseudo-random, temporal deviation dT.

Abstract: A filter is set by a control apparatus automatically detecting a vibration frequency and determining a filter to be needed, in a simple method that does not require a special process. A servo control apparatus which drives a servo motor includes a vibration detection section which detects vibration of a control system, and a vibration frequency measuring and analyzing section. The vibration detection section detects the vibration when the vibration is generated during driving. The vibration frequency measuring and analyzing section measures a frequency of which vibration frequency component is large. Then, a frequency of a vibration suppression filter is set based on the vibration frequency.

Abstract: One embodiment of the present invention provides a system that efficiently conducts vibrational characterizations for a computer system having variable component configurations. During operation, the system receives a given component configuration associated with the computer system. Next, the system looks up the given component configuration in a resonant spectra library, which contains structural resonant frequencies for a number of possible component configurations for the computer system. If the given component configuration is found in the resonant spectra library, the system retrieves a set of structural resonant frequencies associated with the given component configuration. The system subsequently controls one or more vibration sources within the computer system to avoid the set of structural resonant frequencies.

Abstract: A digital processor (2, 102) for use in a digital controller (10) is disclosed. The digital processor (2, 102) includes a coefficient product memory (22) that stores previously calculated products of filter coefficients and each of a set of available input values. The memory (22) is addressed according to a received input value, and outputs a plurality of coefficient products associated with that input value. These coefficient products are combined across time samples (with one or more coefficient products delayed for use in later cycles), to produce an output value. The digital processor (2) can be used in combination with an analog-to-digital converter (4) and a pulse-width modulated circuit (6) to control a power supply. According to another embodiment of the invention, comparators (62H, 62L) and a counter (66) can be used instead of the analog-to-digital converter, for additional efficiency.

Abstract: Vibration protection in a compressor system with a variable speed compressor may include operating a variable speed compressor at a plurality of frequencies, measuring a plurality of vibration values associated with the plurality of frequencies, determining a frequency characteristic of the compressor system based on the plurality of vibration values, and identifying prohibited compressor frequencies based on the frequency characteristic.

Abstract: In a method of automatically setting the vibration suppression filter, when a vibration detection portion detects a vibration A2, a state variable frequency analysis portion analyzes the frequencies of data from a state variable trace portion to calculate a vibration frequency A3, and the frequency characteristics of the vibration suppression filter is set based on vibration frequency A5. A vibration level store portion stores the vibration level before the automatic setting of the vibration suppression filter, a filter setting selection portion compares the vibration level after the automatic setting with the vibration level before the automatic setting A6. When the vibration level after the automatic setting is larger than the vibration level before the automatic setting, restoring of the setting of the vibration suppression filter to the state before the automatic setting A7 and/or reducing the gain of a servo control portion.

Abstract: A system which calibrates notch filters in a digital servo system is presented. A notch filter can be calibrated by obtaining a frequency response curve of the digital servo system in a range of frequencies, searching the frequency response curve for at least one peak frequency, and adjusting parameters of the notch filter to filter out signals at the at least one peak frequency. The digital servo system, for example, can be a tracking servo system or a focus servo system of an optical disk drive.

Abstract: Control of an active vibration isolation system with a digital controller, which includes an FPGA system (5) as the control unit. The FPGA system (5) is made up of freely programmable gate arrays with a sensor control matrix (51), which calculates axis signals in required degrees of freedom, with a control cascade block (53) for the axis signals containing several biquad filters (531, 532, 533, 534, 535), and with an output signal calculation block (55) for calculating digital actuator actuation signals. A digital signal processor (9) is connected in parallel with the FPGA system (5) in order to calculate controls with low phase loss requirements.

Abstract: A vibration damper including a first spline having a plurality of first teeth, a second spline having a plurality of second teeth, a third spline having a plurality of third teeth and at least one spring interconnected between the first and second splines, wherein the plurality of third teeth are intermediate the plurality of first teeth and the plurality of second teeth, and the at least one spring biases the plurality of first teeth and the plurality of second teeth against the plurality of third teeth.

Abstract: The invention relates to a control system for active vibration isolation of a supported payload with a control device that comprises a processing unit (41) for processing position data and orientation data of all available sensors to supply a sensor control matrix, as well as for subsequent calculation of axis input signals in orthogonal degrees of freedom from the sensor signals and the sensor control matrix, a downstream control-path cascade block (42) for processing axis input signals into axis output signals in orthogonal degrees of freedom, and a downstream processing unit (43) for processing position data and orientation data of all available actuators for vibration suppression into an actuator control matrix, as well as for subsequent calculation of actuator control signals from the axis output signals and the actuator control matrix.

Abstract: In order to control vibrations of two parts of a piece of machinery, a variable force may be generated to oppose the vibrations, with the variable force being generated under control of a controller on the basis of an iterative relationship, the iterative relationship being such as to generate the force of one iteration using a controller output signal in frequency domain vector form derived from the controller output signal of the immediately previous iteration in frequency domain vector form plus a frequency domain vector quantity derived from the resultant vibration of more than one previous iteration. Where these two parts are connected by multiple (f) mounting devices, the controller output signals a previous iterations are taken into account, and the frequency domain vector quantity derived from the controller output signals and more than f previous iterations.

Abstract: To achieve improved frequency-response correction of a vibration-signal transmitter in a vibration isolation system, the invention proposes a method in which an analog sensor signal representing vibrations is generated by means of a vibration-signal transmitter, this sensor signal is amplified for correcting frequency-dependent sensitivity of the vibration-signal transmitter, an actuator control signal is generated by processing the amplified sensor signal, and an actuator is controlled with the actuator control signal for counteracting the vibrations, wherein the amplification of the sensor signal includes first amplification by means of an analog amplification stage and second amplification by means of a digital amplification stage. The invention further proposes a correction device and also a vibration isolation system for carrying out the method.

Abstract: The subject of this disclosure concerns a screwing equipment comprising at least one rotary member (1), (21); (22), (3) mounted in a tool body (1)) and capable of producing at least one vibrational frequency representing a wear condition of said rotary member(s). The subject of this disclosure is characterized in that it comprises means for measure (5) said vibrational frequencies designed to communicate (1) with means for processing (52) said measurement enabling same to be compared to at least one reference frequency in order to determine said wear condition.

Abstract: A shock detection circuit housed in an electronic device includes an output shock signal that is indicative of vibration amplitude. To compensate for vibrations that are experienced by the electronic device, the output shock signal is analyzed. The analysis of the output shock signal allows a vibration frequency of the output shock signal to be identified and used in vibration compensation.

Abstract: A system and method for producing and controlling a random signal with simultaneous control of both the power spectral density (PSD) and kurtosis (100) where a controlled signal is measured from a transducer, and converted to a PSD (111) using a Fast Fourier Transform (FFT). The measured PSD is compared (117) with a reference PSD (121) where an adaptive filter (119) is updated to compensate for the error. Simultaneously the kurtosis of the measured data is computed (125) and compared to a reference kurtosis (123). A feedback control loop (127) is employed to adjust the kurtosis of a white noise random generator with variable kurtosis (101). This white noise is then filtered by the adaptive filter (119) to provide the output signal used to drive the control process.

Abstract: A method for actuating active vibration insulators includes the steps of generating an idling control signal in an idling range of a vehicle, generating a running control signal in a running range of the vehicle, and actuating an electromagnetic actuator of an active vibration insulator based on the idling control signal or the running control signal, thereby inhibiting vibrations of a vehicle engine from transmitting by the electromagnetic actuator. The idling control signal is produced by adding a higher order harmonic signal component with respect to a control frequency, based on a cyclic pulsating signal emitted from the vehicle engine, to a fundamental-wave signal component of the control frequency. The running control signal is composed of the fundamental-wave signal component of the control signal. The method can inhibit noises from generating by actuating simple electromagnetic actuators, and can damp vibrations of vehicle engines simply and less expensively.

Abstract: A method of analyzing the vibro-acoustic optimization potential of a structure of vibro-acoustically coupled subsystems having internal and coupling loss factors by means of statistical energy analysis (SEA). The method optimizes the vibro-acoustic behavior of the structure.

Abstract: Methods and systems for analyzing engine unbalance conditions are disclosed. In one embodiment, a method includes receiving vibrational data from a plurality of locations distributed over an engine and a surrounding engine support structure, and inputting the vibrational data into a neural network inverse model. The neural network inverse model establishes a relationship between the vibrational data and an unbalance condition of the engine, and outputs diagnostic information indicating the unbalance condition of the engine. In a further embodiment, a method further includes subjecting the vibrational data to a Fast Fourier Transformation to extract a desired once per revolution vibrational data prior to input to the neural network inverse model.

Abstract: A digital system for controlling the quality factor in a resonant device. The resonant device can be any mechanically driven resonant device, but more particularly can be a device that includes a cantilever within its system, such as an atomic force microscope. The quality factor can be digitally controlled to avoid noise effect in the analog components. One of the controls can use a direct digital synthesizer implemented in a way that provides access to the output of the phase accumulator. That output drives a lookup table to produce a cosine or sine output wave. The output is also formed into a second number that drives a second lookup table to create an adjustment factor. The adjusted digital signal then drives a DA converter which produces an output drive for the cantilever.

Abstract: A detecting and suppressing control method for milling tool chatter. Milling parameters are defined. A milling device is initiated using the milling parameters. Milling signals are extracted using a sensor installed on the milling device. It is determined whether chatter relating to the milling device occurs, comprising determining whether the milling signals are high frequency signals, and, if the milling signals are high frequency signals, determining whether signal points generated based on the milling signals are located in a stable area derived using a sliding function. When the signal points are located in the stable area, the milling signals are stable milling signals. When the signal points are located outside the stable area, rotational rates of a spindle of the milling device are adjusted.

Abstract: The invention relates to a method of analyzing the vibro-acoustic optimization potential of a structure of vibro-acoustically coupled subsystems having internal and coupling loss factors by means of statistical energy analysis (SEA). The invention further relates to a method of optimizing the vibro-acoustic behavior of such a structure.

Abstract: A method controls tub oscillation in a drum type washing machine by utilizing a ball balancer. The method includes maintaining an rpm of a drum in a predetermined rpm level for a predetermine period of time during a dehydration operation, thereby reducing a differential rotation speed between the drum and a ball, and re-increasing the rpm, such that the tub is not subject to the oscillation that is greater than a predetermined level. The drum type washing machine adopts a single race having different ball sizes and viscosities, so that the manufacturing cost of the washing machine is reduced. The tub is prevented from being subject to oscillation greater than a predetermined level through precise calculation.

Abstract: A vibration reducing device that reduces the vibration of a control object includes a digital controller. A vibration state detection device detects the vibration of the control object and generates an analog signal of the vibration of the control object. An input-side bandpass filter has a passband that is narrower than a frequency range from a Nyquist frequency to a sampling frequency of the digital controller, and that contains no frequencies that are an integer multiple of the Nyquist frequency of the digital controller. The input-side bandpass filter allows a part of the analog signal that falls within the passband from the analog signal generated by the vibration state detection device to pass. An A/D conversion device converts the analog signal that has passed through the input-side bandpass filter into a digital signal.

Abstract: Methods and systems for analyzing engine unbalance conditions are disclosed. In one embodiment, a method includes receiving vibrational data from a plurality of locations distributed over an engine and a surrounding engine support structure, and inputting the vibrational data into a neural network inverse model. The neural network inverse model establishes a relationship between the vibrational data and an unbalance condition of the engine, and outputs diagnostic information indicating the unbalance condition of the engine. In a further embodiment, a method further includes subjecting the vibrational data to a Fast Fourier Transformation to extract a desired once per revolution vibrational data prior to input to the neural network inverse model.

Abstract: Methods and systems for analyzing engine unbalance conditions are disclosed. In one embodiment, a method includes receiving vibrational data from a plurality of locations distributed over an engine and a surrounding engine support structure, and inputting the vibrational data into a neural network inverse model. The neural network inverse model establishes a relationship between the vibrational data and an unbalance condition of the engine, and outputs diagnostic information indicating the unbalance condition of the engine. In a further embodiment, a method further includes subjecting the vibrational data to a Fast Fourier Transformation to extract a desired once per revolution vibrational data prior to input to the neural network inverse model.