Abstract: A micro vibration body includes a curved surface portion, a recessed portion recessed from the curved surface portion, a bottom surface protruding portion protruding from a bottom surface of the recessed portion, and a through hole in the bottom surface protruding portion. A mounting substrate has a positioning recess, into which the bottom surface protruding portion is inserted, and electrode portions surrounding the inner frame portion. A joining member is in the positioning recess and joins the bottom surface protruding portion with the mounting substrate. The bottom surface is in contact with a region of the mounting substrate around the positioning recess. The bottom surface protruding portion has a tip end surface that is at a distance from the positioning recess. The joining member at least partially enters the through hole and is electrically connected to the conductive layer.

Abstract: A method of analyzing a vibratory signal derived from rotation of at least one moving part belonging to a rotary mechanism forming all or part of a drive train for transmitting drive torque, the rotary mechanism being fitted to an aircraft and the method comprising at least one first measurement step including measuring vibration in at least one direction and generating a vibratory signal representative of the operation of the rotary mechanism as a function of time, the first measurement step being performed by means of at least one vibration sensor; and at least one second measurement step including measuring an angular position of the moving part, the moving part having at least one degree of freedom to move in rotation about a respective axis of rotation Z. Such an analysis method makes it possible to determine at least one usable range for the vibratory signal.

Abstract: A reference block for ultrasonic shear waves calibration, comprising slots, wherein the reference block has at least two different thicknesses, each thickness comprising two cavities with at least one slot being provided at each cavity. Preferably, the reference block comprises a plurality of steps, each step defining a different thickness.

Abstract: A method for calibrating an output of a torsional vibration transducer can include: providing a torsional vibration transducer proximate to a body of a shaft configured to rotate along an axis of rotation, the torsional vibration transducer configured to measure a torsional vibration of the shaft; actuating the shaft to cause rotation of the shaft; while the shaft rotates, acquiring, using the torsional vibration transducer, a plurality of zero-stress measurements of the shaft across a plurality of gaps between the torsional vibration transducer and the shaft; calculating at least one calibration coefficient using the plurality of zero-stress measurements; and calibrating the output of the torsional vibration transducer according to the at least one calibration coefficient to reduce a sensitivity of the torsional vibration transducer to changes in gap between the torsional vibration transducer and the shaft when the torsional vibration of the shaft is measured.

Abstract: A compact Inertial Wave Angle Gyroscope (IWAG) is operated using a phase lock loop to track resonator phase and a baseband regulator to null quadrature. The resonator velocity or its components computed from precession angle are first determined at baseband and then applied to gain matrices in order to generate the feedback control forces for self-precession, cancellation of damping and compensation of anisodamping. The inertial rotation input is determined from the measured total precession angle by removing the computed or calibrated self-precession angle. The resonator energy can be regulated to a fixed magnitude and the baseband feedback force for self-precession at a fixed rate determined from components computed from precession angle such that the total force is in phase with baseband velocity but has fixed magnitude. The IWAG inertial rotation input can be determined from the measured total precession rate by removing the computed self-precession rate.

Abstract: A gyroscope includes a resonator, a transducer, and a comparator. The comparator is designed to receive an input signal from the transducer and compare the input signal with a reference signal to produce an output signal. Rising and falling edge transitions of the output signal are substantially synchronized with a motion of the resonator along a sense-axis of the transducer.

Abstract: A hemispherical resonator gyro includes: a vibration mode shape extractor to extract, based on sine and cosine wave signals corresponding to an actuator drive frequency and radial displacement of a hemispherical resonator, a vibration mode shape excited in the hemispherical resonator; a drive frequency corrector to cause, based on a resonance phase characteristic of the hemispherical resonator, the actuator drive frequency to match resonance frequency of the hemispherical resonator; a nodal quadrature vibration controller to generate, based on a vibration amplitude of a nodal quadrature vibration and azimuth orientation of wave antinode of a resonance mode, an actuator DC drive signal to suppress the nodal quadrature vibration; and a resonance controller to generate an actuator AC drive signal to control the vibration amplitude to be a constant value, and detect a rotational angle in an angle measurement axis direction from the azimuth orientation of wave antinode of the resonance mode.

Abstract: A reference vibrator 10 of the present invention includes: a vibrator body 11 configured to mount to a mount 4 in an unbalance measurement device 1 to which a rotary product is mounted at the time of unbalance measurement, in a same mounting state as the rotary product; a vibration generator 12 fixed to the vibrator body 11 and that applies vibrations to the vibrator body 11; and a control unit 13 that controls the vibration generator 12. Because vibration is caused by the vibration generator 12 fixed to the vibrator body 11, repeatability of vibration force is high. This makes it possible to apply vibrations for repeatability check to the unbalance measurement device 1 with an accurate vibration force. Thus, variations in vibration force can be eliminated, and the repeatability of the unbalance measurement device 1 can be properly checked.

Abstract: A method and a system for identifying failures in an aeroengine. The system includes: a mechanism defining a set of standardized indicators representative of operation of the aeroengine; a mechanism constructing an anomaly vector representative of a behavior of the engine as a function of the set of standardized indicators; a mechanism selecting in an event of an anomaly being revealed by the anomaly vector a subset of reference vectors having directions belonging to a determined neighborhood of a direction of the anomaly vector, the subset of reference vectors being selected from a set of reference vectors associated with failures of the aeroengine and determined using criteria established by experts; and a mechanism identifying failures associated with the subset of reference vectors.

Abstract: An apparatus for measuring forces produced by an unbalance of a rotary member 8 includes a support device 3 for supporting the rotary member 8 rotatably about its axis 1, and having at least one measurement sensor 4 placed at a vibratory location of the support device 3, wherein the at least one measurement sensor 4 is designed to measure vibratory accelerations of the location at which the measurement sensor 4 is placed.

Abstract: A device for calibrating and testing echotomographic equipment comprises an electric motor, a pair screw—female screw, wherein the screw is connected to an outlet shaft of the motor and the female screw is mobile with respect to a supporting plane, so as to transform a rotary motion of the motor shaft into a linear motion, a piston connected to the female screw and linearly mobile, coherently to the female screw, a membrane stressed by the piston, means apt to allow propagating ultrasound waves towards/from said membrane.

Abstract: A method of matching sensors in a multi-probe blade vibration monitor for a turbine. The method includes providing at least two probes mounted in a casing of the turbine adjacent to a rotating blade structure of the turbine. Targets are provided on radially outer portions of the blade structure. Each of the probes includes a sensor generating signals corresponding to target passing events, and a set of synchronous harmonics of the rotational speed of the rotor are produced for each sensor. The position of the sensors is adjusted such that the sets of harmonics of the sensors are substantially matched, indicating that the positions of the sensors are matched.

Abstract: A method to balance spindles in a plurality of disk drives is disclosed and claimed. An initial imbalance and initial phase for one of the plurality of disk drives is determined, the determination depending upon an amplitude and phase calibration. One of a plurality of balancing masses is selected based on the initial imbalance and attached at an angular position selected based upon the initial phase. A final imbalance after attachment is similarly determined. These determinations are repeated for each of the plurality of disk drives, with the final imbalance and the initial imbalance recorded for each. The amplitude calibration is adjusted based on a comparison of a measured distribution and a theoretical distribution of the final imbalance versus the initial imbalance.

Abstract: A manufacturing apparatus which includes a rotary machine, includes: a plurality of accelerometers configured to measure diagnosis time series data attached to the rotary machine at locations where variations of the rotary machine are different; a frequency analysis device configured to perform a frequency analysis on the diagnosis time series data measured by the plurality of accelerometers; a time series data recording module configured to generate diagnosis data based on variations in characteristics of vibration corresponding to an analysis target frequency and to record the diagnosis data; and a life prediction unit configured to analyze the diagnosis data to determine a life span of the rotary machine.

Abstract: A system and method for assessing and potentially correcting for non-translational motion in a resonance measurement apparatus is provided. The design measures the response of an article, such as an HGA assembly including a read/write head, as well as the excitation of a shaking device, such as a head resonance tester, and computes a correction factor using either two or three point measurement. The correction factor may be evaluated by subjecting the arrangement to further vibration at varying frequencies. Measurement of the shaking device may be accomplished using an accelerometer or by optical measurement using a light beam.

Abstract: Measurement is made of centrifugal force produced on a crankshaft to be tested that is being rotated about its rotation axis, to provide centrifugal force variation information of the crankshaft. Also, measurement is made of errors in respective rotational phases of crankpins of the crankshaft about rotation axes of the crankpins. Dummy information, comprising rotational unbalance data representative of rotational unbalance components to be removed from the centrifugal force variation information of the crankshaft, is created using the measured errors in the respective rotational phases. Then, an initial rotational unbalance value of the crankshaft is determined, using the dummy information and the centrifugal force variation information of the crankshaft.

Abstract: A drive location compensation system determines a deviation between an actual and nominal position of a drive location on a rotor relative to an attachment location on the rotor. The compensation system uses a balancing machine and a sensor that detects when one of the attachment locations passes a known position. Based on the output of the sensor and a known position of a drive spindle of the balancing machine that is coupled to the drive location on the rotor, a relation between the drive spindle and the attachment location is determined. This relationship is compared to a nominal relationship that is based on a calibration standard. The deviation is compensated for during the balancing or the rotor.

Abstract: A tissue mimicking material for ultrasound phantoms has ultrasound speed and attenuation characteristics that are characteristic of human tissue and well suited for use in measuring and calibrating the potential biological effects of ultrasound equipment. The material is formed of an aqueous mixture of large organic water soluble molecules condensed from skim milk with a total solids content in the range of 10% to 30% by weight. The total fat content is less than 1% by weight, with the residual lipid particles of a size sufficiently small to remain in suspension without agglomerating and separating from the mixture over extended periods of time.

Abstract: A transducer position adjustment method, performed to compensate for initial ultrasonic beam alignment error, includes the steps of providing a manipulator of an ultrasonic immersion testing system having a pointing direction and supporting a transducer generating an ultrasonic beam, providing a calibration body defining a target thereon, immersing the transducer of the manipulator and the calibration body in a coupling fluid in an immersion tank of the system, setting the manipulator initially at a first position such that the pointing direction of the manipulator is aligned with the calibration body target at known coordinates, and adjusting the manipulator subsequently to a second position such that the ultrasonic beam of the transducer is brought into alignment with the calibration body target at the known coordinates for initiating an inspection of a test object after replacing the calibration body with the test object.