RU2754238C1 - Low-frequency vibration stand for calibrating piezoelectric sensors - Google Patents

Abstract

FIELD: measuring equipment.SUBSTANCE: invention relates to measuring equipment and is intended for calibration of piezometric sensors, in particular, for creating a controlled impact on calibrated piezoelectric sensors. The stand includes a massive base, a system of four guiding rods. The guiding rods are connected with a metal ring, whereto a pipe section is attached by four screws, on two parallel threaded holes whereof two test objects are rigidly attached using two pins, wherein the pipe section is movable.EFFECT: technical result consists in increasing the accuracy of the results due to the change in the design of fastening of the test objects to the calibration vibration stand.1 cl, 3 dwg

Description

The invention relates to measuring equipment and is intended for the calibration of piezometric sensors, in particular for creating a controlled effect on the calibrated piezoelectric sensors. The proposed solution can find application in instrumentation, mechanical engineering and other industries where it is required to test products for resistance to flat and spatial mechanical stress.

The prototype is a multidirectional test shaker (RF patent No. 178307 dated 03/29/2018, IPC G01M 7/02), which includes a plate and a massive base, characterized in that the plate on which the test object is attached with a magnet is movable and is connected in parallel with a massive the base is a system of elastic guides, consisting of four guide rods, on which eight identical springs are placed.

The disadvantages of the prototype include the insufficiently high reliability of the measurement results, due to the imperfection of the fastening mechanism of the calibrated and calibration sensors, namely, the attachment of the sensors to the plate, which, in turn, is subject to the influence of natural vibrations of the shaker.

The objective of the invention is to develop a low-frequency shaker for calibrating piezoelectric sensors, which eliminates the disadvantages of the prototype.

The technical result is to increase the reliability of the results by changing the design of the attachment of the test objects to the calibration shaker.

The technical result is achieved by the fact that a low-frequency vibration stand for calibration of piezoelectric sensors, including a massive base, a system of four guide rods, according to the invention, the guide rods are connected by a metal ring, to which a pipe section is attached with four screws, on two parallel threaded holes of which are rigidly attached two test objects using two pins, while the pipe section is movable.

The essence of the invention is illustrated by a drawing, where FIG. 1a, 1b shows a calibration shaker, Fig. 2 is a diagram of the implementation of the inventive device.

The numbers in the drawings indicate:

1 - pipe cut;

2 - metal ring;

3 - screw;

4- nut;

5 - rod;

6 - massive base;

7 - digital-to-analog and analog-to-digital converter (DAC-ADC);

8 - audio signal amplifier;

9 - electroacoustic emitter;

10 - shaker;

11 - calibrated piezoelectric sensor;

12 - calibration piezoelectric sensor.

A low-frequency vibration stand for calibrating piezoelectric sensors consists of a mechanism for securing a pipe cut 1, which is a metal ring 2 with four screws 3 and four nuts 4, a system of guides consisting of four rods 5 rigidly attached to a massive base 6.

To explain the operation of a low-frequency shaker for calibrating piezoelectric sensors, figure 2 shows a diagram of the implementation of the claimed device.

Calibrated 10 and calibration 11 sensors are installed on a section of pipe 1, the diameter of which can be up to 200 mm, with the help of two studs threaded into the previously prepared threaded holes, so that they are parallel to each other and at the same height. The axes of sensitivity of the sensors 11 and 12 must coincide with the direction of the vibrations excited by the electro-acoustic emitter 7 using a controlled regulated action, the amplitude and frequency of which lie within the corresponding ranges of the sensors. DAC-ADC 9 has an output to a personal computer (conventionally not shown in the drawing). The audio frequency generated by the program with the ability to adjust the signal frequency in a wide range, set in a personal computer, passes through the DAC-ADC 9 and is fed to the audio signal amplifier 8, which, in turn, transmits the signal to the electro-acoustic emitter 7, placed on a massive base 6 shaker. Oscillations are transmitted to the walls of the pipe section 1, fixed by means of the fastening mechanism, along the axis of sensitivity of the sensor being calibrated.

The parameters of vibrations of the pipe cut 1 are recorded by the calibration 11 and calibrated 10 sensors, the output signal from which is sent through the DAC-ADC 9 to a personal computer, in which the computer program determines the sensitivity of the sensors 10 and 11 in the operating frequency and amplitude range.

Claims (1)

Low-frequency vibration stand for calibration of piezoelectric sensors, including a massive base, a system of four guide rods, characterized in that the system of four guide rods is connected by a metal ring, to which a piece of pipe is attached with four screws, on two parallel threaded holes of which two test objects are rigidly attached with the help of two pins, while the pipe section is movable.

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