Abstract: A method of estimating parameters of time series data using a Fourier transform is disclosed. The parameter estimation method of the present invention can directly estimate modes and parameters, indicating the characteristics of a dynamic system, on the basis of the Fourier transform of the time series data. Accordingly, the present invention is advantageous in that it can estimate parameters of the system through a single Fourier transform without repeatedly calculating a Fourier transform, thus shortening the time required to estimate the parameters.

Abstract: According to the invention, in a method for determining the angular position of a rotor, a reference voltage is set in a calibration phase, such that when the rotor, rotating at a calibration speed, passes through a particular detection position, said voltage is the same as the electromotive force induced in the one winding coil. In a subsequent measuring phase the reference voltage is updated to a value (UR) which is equal to the product of the voltage value set in the calibration phase and the ratio of the instantaneous motor rotational speed to the calibration rotational speed. The angular position of the rotor (?1) at which the electromotive force corresponds to the updated reference voltage is thus identified as the detection position.

Abstract: An inspection and verification system includes an inspection fixture for inspecting a finished part prior to its placement in a shipping container. The inspection fixture signals a processor that the finished part has “passed” or “failed”. A finished part that passes is placed in the shipping container, which is locked in a loading position on the weighing platform of an electronic scale. If the weight of the finished part does not match a standard finished part weight, the part is rejected, the shipping container is removed and quarantined, and a new shipping container is locked in the loading position. When the weight of the finished part matches the standard weight, the part is accepted and it remains in the shipping container. When the processor receives a number of “accept” signals equal to a standard shipping container quantity, it releases the shipping container.

Abstract: A method and apparatus for detecting the defects of at least one rotor of a rotary wing aircraft, in particular a helicopter, in order to adjust the rotor. In the method, in a preliminary step, a reference aircraft is used corresponding to a particular type of aircraft and having a rotor (6, 10) without defect and adjusted so that the level of vibration is at a minimum, a series of measurements are taken on the aircraft (1), and a neural network is deduced therefrom illustrating the relationships between accelerations representative of vibration, and defects, and adjustment parameters. Thereafter, in a later step, for a particular aircraft (1) of the same type, measurements are taken on the particular aircraft (1) and on the basis of said measurements and on the basis of the neural network, the defects, if any, are detected and values for the adjustment parameters are determined that will enable the level of vibration of the aircraft (1) to be minimized, which parameters are applied to the rotor (6, 10).

Abstract: A reduced order model called the Fundamental Mistuning Model (FMM) accurately predicts vibratory response of a bladed disk system. The FMM software may describe the normal modes and natural frequencies of a mistuned bladed disk using only its tuned system frequencies and the frequency mistuning of each blade/disk sector (i.e., the sector frequencies). The FMM system identification methods—basic and advanced FMM ID methods—use the normal (i.e., mistuned) modes and natural frequencies of the mistuned bladed disk to determine sector frequencies as well as tuned system frequencies. FMM may predict how much the bladed disk will vibrate under the operating (rotating) conditions. Field calibration and testing of the blades may be performed using traveling wave analysis and FMM ID methods. The FMM model can be generated completely from experimental data. Because of FMM's simplicity, no special interfaces are required for FMM to be compatible with a finite element model.

Abstract: A method, apparatus and computer program product are provided for implementing physical interconnect fault source identification. Interconnect test data are processed and each unique failing chip combination is identified. Each common failing chip of the identified unique failing chip combinations is identified. A selected probability failure is reported for each identified common failing chip.

Abstract: One embodiment of the present invention provides a system that validates sensor operability in a computer system. During operation, the system perturbs the computer system with an excitation, wherein the excitation may be physical or software-based. The system then receives a number of responses to the excitation through sensors in the computer system, wherein each response is represented as a value of a variable which may vary with time. Next, the system compares the received responses with a set of reference responses gathered from properly functioning sensors in a reference computer system. The system then determines from the comparison whether the sensors in the computer system are operating properly.

Abstract: A system and method are provided to regulate resistance in a discontinuous time hot-wire anemometer. The solution removes supply voltage dependency on the mass airflow output signal. Operating the hot-wire anemometer using discontinuous time regulation offers lower system power, but introduces an inverse supply dependent term in the associated transfer function. This effect is removed by multiplying the output signal via a supply dependent signal.

Abstract: A system and a method for determining an angular position of a rotor and a radial position of the rotor are provided. The rotor has either a slot or a protrusion on the rotor. The rotor is centered about a center point. The method includes generating a first signal utilizing a first sensor disposed proximate the slot or protrusion of the rotor. The method further includes determining a first angular position of the rotor by identifying a first corrupted portion of the first signal. The method further includes removing the first corrupted portion of the first signal to obtain a second non-corrupted position signal. The method further includes determining a first radial coordinate of the center point of the rotor based on the second non-corrupted position signal.

Abstract: A system and method for generating a test signal used in measuring the speed of a rotating device, such as a fan in a computer system is disclosed. A pulse width modulated (PWM) signal may power the fan with the duty cycle of the PWM signal controlling the speed of the fan. The fan may generate tachometer pulses used for monitoring RPM of the fan. The frequency of the test signal may be selected to be at least twice the frequency of the tachometer pulses. The test signal may be generated from a base frequency signal using two cascaded frequency dividers. The first divider may output a scaled base frequency signal obtained by dividing the base frequency signal by a user programmable scale frequency coefficient corresponding to a maximum test signal frequency for the fan. The second divider may output the test signal by dividing the scaled base frequency signal by a fraction frequency coefficient obtained from and proportional to the current PWM duty cycle value.

Abstract: The rotary detector according to this invention comprises a rotary detector unit C1, C1? which detects rotary motion of a rotor; and a rotary calculator unit C2, C2?, C2? comprising a rotation angle detector, which detects the rotation angle of the rotor, and an angle speed detector 47 which detects the angle speed of the rotor, based on the output of the rotary detector unit. The rotary calculator unit comprises a trigonometrical calculator C3, C3?, C3? which calculates a sine value or a cosine value of the rotation angle detected by the rotary detector; a gain adjuster 57, 57?, 57? which multiplies the sine value or the cosine value, calculated by the trigonometrical calculator, by a predetermined gain; a multiplier 59, 59? which multiplies the output of the gain adjuster by the output of the angle speed detector; and a subtracter 61, 61? which subtracts the output of the multiplier from the output of the angle speed detector.

Abstract: A sensor system for determining distances is provided. A predefining unit controls an amplifier unit and/or a sensor unit as a function of selectable predefined values for a detection cycle. Contrary to known sensor systems, different detection cycles are implementable in a simple manner using this procedure.

Abstract: Signals from a plurality of sources are observed by a plurality of sensors disposed in two dimensions, and the observed signals are subject to a short-time Fourier transform, from which frequency domain signals are derived. Using the independent component analysis process on the frequency domain signals, separation matrices are produced, and an inverse matrix of each separation matrix is calculated. The direction of each source is calculated based on a ratio of a pair of elements in each column of the inverse matrix.

Abstract: A method of optimizing the timing between signals to be latched and a respective latching clock signal is suggested wherein test timings are provided according to which a delay test value of a clock delay line (CDL) are generated. According to the delay test values a clock signal (C) and a sample signal (S) are received through said clock delay line (CDL) and through said sample signal line (SSL), respectively. Respective phase differences for the distinct delay test values are obtained. A delay value is chosen and set for operation for which the respective obtained phase difference fits best to given target timing data.

Abstract: The invention proposes a method for detecting the motion of an element relative to a sensor device, in which signals (7 to 15) are evaluated as a function of a pulse generator (1) that is moved past the sensor (3, 4, 5). The signals (7, 8; 10, 11; 13, 14) of two sensor elements (4, 5) disposed next to each other in the movement direction are detected, wherein in order to detect vibrations perpendicular to the movement direction, the phase responses of the signals (7, 8; 10, 11; 13, 14) of the individual sensor elements (4, 5) and of the differential signals (9; 12; 15) of the individual sensor elements (4, 5) are evaluated as to whether all three signals are in phase.