SU82600A1 - Method of measuring mechanical quantities on rotating parts of machines - Google Patents

Description

A method is proposed for measuring mechanical quantities (for example, displacements, velocities, accelerations) of rotating parts of machines and other devices by acting on the variable capacitance or inductance of the sensor included in the electronic generator circuit.

The main disadvantage of the known methods of this kind is that the resistance of the transitional contact device (for example, current collector and current-carrying ring) has the same effect on electric current passing through it as the measured value itself, as a result of which it is impossible to accurately determine the measured value according to the output device.

This lack of the proposed method is not. The method is based on the principle of frequency modulation and is characterized in that the capacitance and inductance of the sensor incorporate in oscillatory the circuit of an electrical generator with a frequency module in the form of the 5th parameter of its parameter.

The availability of the proposed method lies in the fact that either a shocking agent (mechanical acoustic 11 et al.) Can be connected to one of the electrical parameters of the electrical oscillator circuit, the main frequency of which changes the aforementioned loop parameters. The fundamental frequency of the oscillator L is in time corresponding to the serpent of the modulating parameter, and in further stages of the sizing of the device, the frequency does not change to 1 change of the output current nl (direction.

The technique is carried out 1 of the proposed method 1t in that a sensor is placed on the rotating part, the capacitance plp inductance of which varies according to the measured mechanical value (displacement, speed, accelerated 1, etc.).

№ 82600

The sensor is connected via sliding contacts to the driver circuit of the electronic generator so that the sensor parameter (C or and),) is included as part of the total value of the corresponding circuit parameter (c, L). Under the action of the measured mechanical value, the sensor parameter (for example, C e.) Varies with time with the frequency according to the equation:

WITH ,. Sd sinl- /.

According to the principle of frequency modulation, the oscillator frequency will also change with the same frequency:

0) -: + L (0 sin --t.

The next stage (limiter) of the measuring device eliminates the influence on the measurement results of current oscillations or voltages taken from the generator. After the limiter, the current is directed to the frequency detector; the current or voltage that is removed from the detector has the same frequency and is proportional to the amplitude of D w, i.e., the measured mechanical value.

Due to the cumulative effects of the limiter and the frequency detector, the output current does not depend on the magnitude of the oscillating current within the limits that fully meet the needs of the measurement.

Subject and d on and e and

A method of measuring mechanical quantities on rotating parts by scaling the effects of a measured value on sensors with varying inductance or capacitance included in an oscillator circuit of an electronic generator, characterized in that, in order to eliminate the effect of transition contact, for example, contact rings and brushes , inductance or capacitance are included in the oscillating circuit of a frequency-modulated oscillator as a modulating parameter.