The invention is adapted to properly suppress noises of various frequency bands. An input unit (10) includes an acquiring element (11) for periodically acquiring signals from a load cell, so as to obtain time series signals; a plurality of frequency filters (121-123) for filtering the time series signals according to frequencies; and a transfer element (13) for transferring the signal filtered by at least one of the frequency filters (121-123) according to the frequency to a control device (90). The suppressed frequency bands of the frequency filters (121-123) are not repeated.

A rotorcraft comprising a rotor blade designed to flap about a hinge point, a measurement system designed to measure blade flapping, and a processing system designed to alter blade flapping measurements. The processing system further comprises a correction process to alter a blade flapping measurement dependent on rotor RPM or rotor torque.

A resolver system includes a rotatable primary winding, a secondary winding fixed relative to the rotatable primary winding, a tertiary winding fixed relative to the rotatable primary winding and positioned π/2 radians out of phase with respect to the fixed secondary winding, an excitation module electrically connected to the rotatable primary winding and configured to provide an excitation signal to the rotatable primary winding where the excitation signal is an alternating current waveform having a fundamental frequency, and a controller electrically connected to the secondary winding and configured to sample a voltage across the secondary winding at 18 times the fundamental frequency, sample a voltage across the tertiary winding at 18 times the fundamental frequency, and determine an amplitude of the fundamental frequency based on the sampled voltages across the secondary and tertiary windings, where the alternating current waveform includes a third harmonic frequency.

A resolver disposed to monitor a rotatable member is described, along with an associated method for evaluating an output signal therefrom. The method for monitoring the resolver includes supplying an excitation signal to the resolver, and monitoring, at an oversampling rate, first and second output signals from the resolver. An oversampling routine is executed to determine averages of the first and second output signals from the resolver. A demodulation angle error is determined based upon the first and second output signals from the resolver, and provided as feedback. A position of the resolver is also determined based upon the first and second output signals from the resolver.

A motor control device is configured to control a motor as a dynamic force source depending on a position of a rotation detection object that rotates while interlocking with the motor, the motor and the rotation detection object being included in a mechanical apparatus including a plurality of constituent elements that interlock with each other. The motor control device includes a computation circuit configured to compute an absolute rotation angle of the rotation detection object, using a relative rotation angle of a first constituent element of the mechanical apparatus that is detected through a relative angle sensor provided in the mechanical apparatus, and a rotation number conversion value resulting from converting an absolute rotation angle of a second constituent element of the mechanical apparatus that is detected through an absolute angle sensor provided in the mechanical apparatus, into a rotation number of the first constituent element.

A method and arrangement keep track of the cumulative absolute drift of a measurement device, in connection with calibration actions performed by a calibrator. Measurement results are saved (22) in each measurement instant, and if they exceed a threshold value (23), an adjustment step is performed (24). Irrespective of the adjustment steps, the latest drift value (25) during the latest calibration interval is summed (26) with the previous cumulative drift value. The cumulative drift value, i.e. AbsDrift, is saved to a server, from where it can be illustrated visually (27). If there is an uncommon pattern or large cumulative drift present, an indication or alarm (28) can be sent to the user of the calibrator.

A method and arrangement keep track of the cumulative absolute drift of a measurement device, in connection with calibration actions performed by a calibrator. Measurement results are saved (22) in each measurement instant, and if they exceed a threshold value (23), an adjustment step is performed (24). Irrespective of the adjustment steps, the latest drift value (25) during the latest calibration interval is summed (26) with the previous cumulative drift value. The cumulative drift value, i.e. AbsDrift, is saved to a server, from where it can be illustrated visually (27). If there is an uncommon pattern or large cumulative drift present, an indication or alarm (28) can be sent to the user of the calibrator.

ABSTRACT A control method of a measurement supplied by a first turbomachine sensor by a first channel, and by a second turbomachine sensor by a second communication channel includes: acquiring the first signal from the first communication channel and the second signal from the second communication channel; determining of a validity status of each of the acquired signals; and transmitting of a signal to be processed.

ABSTRACT A control method of a measurement supplied by a first turbomachine sensor by a first channel, and by a second turbomachine sensor by a second communication channel includes: acquiring the first signal from the first communication channel and the second signal from the second communication channel; determining of a validity status of each of the acquired signals; and transmitting of a signal to be processed.

A method is provided for improving the EMC robustness of Integrated Capacitive Sensor systems with a sensor Signal-Conditioner (SSC). The SSC is connected with a capacitive integrating converter to convert a received signal into a bit stream. An oscillator provides a plurality of sampling frequencies. A counter connected with the capacitive integrating converter collects the bit stream and calculates the digital representative of the physical input which is than stored in an output register. The method includes performing some conversions with different sampling frequencies from the oscillator or a frequency divider by the capacitive integrating Signal-Converter; storing the results of the samplings and using the results in the following cycle to calculate for each sampling frequency a difference to the prior sampling of the same frequency; and calculating the digital representative of the input signal from the external sensing capacitor as the reverse weighted average of the samplings of the different frequencies.