SU966601A1 - Device for measuring angular acelerations - Google Patents

Description

(54) DEVICE FOR MEASURING ANGULAR ACCELERATION OF BIG, GREMIN AND SHROOT

one

The invention relates to the measurement of motion parameters, in particular, piezoelectric angular acceleration meters.

Known angular acceleration meters with piezoelectric transducers tl and 2 3

However, such devices are relatively complex and have limited functionality.

Closest to the proposed technical essence and the achieved result is the device containing the packages of piezoelements 3j installed along the perimeter between the base and the load.

A disadvantage of the device is the limited functionality in the measurement of angular accelerations, due to the single-channel configuration of the piezoelectric elements.

The purpose of the invention is the expansion of functional capabilities.

The goal is achieved by the fact that the device is equipped with differential amplifiers, the number of which is equal to the number of packages of piezoelectric elements, and the inputs

J of each amplifier is connected to the middle terminals of the pairs of piezoelements of adjacent packets of piezoelements with the same polarization.

FIG. i presents constructs 10 on the device diagram; in fig. 2 shows section A-A in FIG. one; in fig. 3 - electrical circuit of the device.

The load 1 (Fig. 1) is mounted on the piezo elements 2, placed on the base

15 3. The preliminary elastic preload of the piezoelectric elements 2 is carried out by means of a stud 4 with a washer 5 and a nut 6. The piezoelectric elements 2 are combined into three groups of packages of piezoelectric elements 7, 8

Claims (3)

20 and 9, associated with the connection circuit of piezoelectric elements, consisting of corresponding differential amplifiers 10, 11 and 12 (Fig. 3). The inputs of each differential amplifier are connected to the average outputs of 13.14 and 15 pairs of packets of piezoelectric elements of adjacent packets of the same e polarization. The device for measuring angular acceleration works as follows. If an acceleration is reported to the sensor, directed along its main axis OO, then the piezoelements in each packet are affected by the component forces, which in total are equal to the inertial force from the movement of the load 1, directed along the axis O-Yu. However, since on average outputs of pairs of piezoelectric elements in 9TC "vi" case, signals of the same polarity occur, they are compensated for by differential amplifiers 10.11 and 12 and there are no signals at their outputs. The signals to the output of the differential amplifiers 1O, 11, and 12 are also absent if the sensor has lateral accelerations. If acceleration is reported to the sensor at torsional oscillations around any axis lying in the plane of the piezoelectric elements, for example around the X, Y or X axis (Fig. 2), signals of different polarities appear at the middle terminals of the piezoelectric elements, which are summed and amplified by differential amplifiers. and, at their outputs, signals appear proportional to the acceleration at torsional oscillations around the axis X, Y or, respectively. In the event that the sensor is reported to accelerate at torsional oscillations around any axis directed at an angle But if the plane is in the same plane with them, then the middle terminals of the pairs of piezoelectric elements again receive signals of different polarity, which are also added up and amplified by differential amplifiers, and signals are produced at their outputs proportional to the corresponding accelerations. By the magnitude of the signals with the output of differential amplifiers (since the arrangement of groups of piezo elements is known for a particular sensor), you can always determine the direction of the axis around which the sensor torsional vibrations occur, and its acceleration. Thus, the proposed device provides a measurement of accelerations in torsional oscillations in two directions, and in a signal proportional to the measured acceleration, Morjrr, there are no components from accelerations in linear oscillations. An apparatus for measuring angular accelerations containing piezoelement packages installed along the perimeter between the load and the load, characterized in that, in order to expand its functionality, it is equipped with differential amplifiers, the number of which equals the number of piezoelectric element packets, and the inputs of each amplifier are connected to average outputs of pairs of piezoelectric elements of neighboring packages of piezoelements with the same polarization. Sources of information taken into account in the examination 1. US patent number 3789935, cl. G O1 P 15 / OO, 05.02.74. 2. US patent number 3147391, cells, G 01 R 15/09, 03/27/61. - 3. USSR author's certificate No. 4646778, cl. Q 01 6 1/16, 14.06.71 (prototype).