RU4013U1 - DEVICE FOR DETERMINING RIGIDITY OF AN ELASTIC SUSPENSION OF A SENSITIVE ACCELEROMETER ELEMENT - Google Patents

Abstract

A device for determining the stiffness of an elastic suspension of a sensitive element of an accelerometer, comprising an accelerometer, a torque sensor, an adjustable potentiometer, a power source, a rotation angle sensor, a voltage meter, and the first output of the accelerometer is connected to the first input of the torque sensor, the second input of which is connected to the output of the power source, and the third - with the output of an adjustable potentiometer, the second output of the accelerometer is connected to a rotation angle sensor connected in series with a voltage meter, different the fact that it additionally introduces a stepper motor, a clock generator, a key, a torque calculator, two memory blocks, an analyzer, a control signal shaper, an analog-to-digital converter, an elastic suspension calculator for the accelerometer sensitive element, and the output of the moment sensor is connected in series with the first the input of the moment calculator, at the (n - 1) -th inputs of which the signals of the accelerometer passport parameters are supplied, the first memory unit, the analyzer, the output of which is connected to the first input of the second memory block, and the output of the clock generator is connected to the first input of the key, the second input of which is connected to the output of the power source, and the third to the output of the driver of the control signal, the input of which is connected to the second output of the first memory block, the output of the key is connected to the input of the stepper motor and the output of the stepper motor is connected to the input of an adjustable potentiometer, while the output of the voltage meter is connected in series with an analog-to-digital converter, the second input of the second memory unit and the first input

Description

The device for determining the stiffness of the elastic suspension of the sensitive element of the accelerometer

The utility model relates to instrumentation and can be used to control compensatory pendulum accelerometers with an elastic suspension of the sensing element.

A device for determining the stiffness of an elastic suspension of a sensitive element of an accelerometer is known (see USSR Author's Certificate No. 866482 class G 01 P 21/00, 1973).

The closest technical solution (prototype) is a device for determining the stiffness of an elastic suspension of a sensitive element of an accelerometer (see D.A. Braslavsky "Instruments and sensors of aircraft from Mechanical Engineering publishing house, M.1970, p. 352).

A disadvantage of the known device is the low accuracy of the measurement and the inability to automate the measurement process.

The purpose of the utility model is to increase accuracy and to be able to automate the measurement process.

The utility model consists in introducing additional blocks into a known device and creating new functional relationships between them, namely: a stepper motor, a clock generator, a key, a torque calculator, two memory blocks, an analyzer, a control signal shaper, and an analog- a digital converter, a calculator of the stiffness of the elastic suspension of the sensitive element of the accelerometer, and the output of the moment sensor is connected in series with the first input of the moment calculator, the (n 1) th inputs of which are the signals of the accelerometer passport parameters, the first memory unit, an analyzer, the output of which is connected to the first input of the second memory unit, and the output of the clock pulse generator is connected to the first input of the key, the second input of which is connected to the output of the power source and the third with the output of the driver of the control signal, the input of which is connected to the second output of the first

of the memory unit, the key output is connected to the input of the stepper motor, and the output of the stepper motor is connected to the input of the adjustable potentiometer, while the output of the voltage meter is connected in series with an analog-to-digital converter, the second input of the second memory unit and the first input of the stiffener elastic suspension of the accelerometer sensitive element, at the (n - 1) th inputs of which the signals of the passport parameters of the accelerometer are given.

In FIG. 1 presents a functional diagram of the claimed device for determining the stiffness of the elastic suspension of the sensitive element of the accelerometer, where:

1 - studied accelerometer;

2- torque sensor;

3- the moment analyzer;

4 - the first block of memory;

5- analyzer;

6 - driver of the control signal;

7- power supply;

8- adjustable potentiometer;

9-step motor;

10 - clock generator;

11- key;

12- angle sensor;

13- voltage meter;

14- analog-to-digital converter;

15- second memory block;

16 - calculator of the stiffness of the elastic suspension of the sensitive element of the accelerometer.

The device operates as follows:

The studied accelerometer 1 is installed in one of two positions, in which its measuring axis is vertical and connected respectively to the torque sensor 2 and the rotation angle sensor 12. When the power supply 7 is turned on, a current flows through the torque sensor circuit 2, the value of which is determined by the total resistance of the torque sensor winding RftM and series-connected load resistance Rn

adjustable potentiometer 8. The adjustable potentiometer 8 is controlled by a stepper motor 9, which is turned on when the signal from the clock generator 10 arrives at its input, through the key 11, if there is an enable signal from the driver of the control signal 6 determining one measurement cycle at its input . At each step of the stepper motor 9, a change in the value of the load resistance Rn in block 8 occurs and, accordingly, the moment value of the torque sensor 2 changes, which is calculated by the formula:

Mn Mo (j f -1), where (1)

UK C.P + Cdm

MO - pendulum accelerometer;

Rn is the load resistance;

RdM is the resistance of the winding of the torque sensor;

U6 is the voltage of the external signal source;

UK - the steepness of the output characteristics of the accelerometer;

MO, UK, Rn - are taken from the passport to the accelerometer in the moment 3 analyzer, then stored in the first memory block 4. From the first output of the first memory block 4, an information signal is fed to the input of the analyzer 5, in which the results are checked for “coincidence, t. e. the specific value of the addresses of the stepper motor is determined, at which the moment values coincide. The addresses of the stepper motor determine the specific values of the resistances that ensure equal moments. At the same time, from the second output of the first memory block 4, a service-enable / read signal is supplied to the input of the control signal generator 6, by which a control signal is generated allowing the next clock pulse to be transmitted to the stepper motor 9. A signal proportional to the angle of rotation of the torque sensor is generated at the output of the rotation angle sensor 12 Udy. in block 13, the voltage values Udy are measured in accordance with the position of the stepper motor and, through an analog-to-digital converter 14, is fed to the first input of the second memory block 15. Therefore, after determining the specific values of the addresses of the stepping motor, at which the moments coincided, the analyzer 5 at the output a signal is formed, according to which the voltage values are calculated from the second memory block 15 with equal moments and the increment value AUdy is determined, which enters the calculator the stiffness of the elastic suspension 16, in which the claim is calculated,

my value of the stiffness coefficient of the unrugged suspension of the sensitive element of the accelerometer Kt but the formula:

  ()

 c /; cA / aI + a) (+))

MO - pendulum accelerometer;

t / b is the external source signal strength;

UK - steepness of the accelerometer output characteristic;

Kdu is the gear ratio of the angle sensor;

bJJdy - change in the output voltage of the angle sensor;

Rn is the load resistance;

RdM is the resistance of the winding of the torque sensor;

Km is the resistance of the adjustable potentiometer for two positions of the sensitive element of the accelerometer.

Values MO, UK, Rn, Kdu - are taken from the passport to the accelerometer and entered into the scanner by the operator.

Using the claimed utility model allows to increase the measurement accuracy due to the precision selection of the parameters of the measuring system to determine the stiffness of the elastic suspension of the sensitive element of the accelerometer. And also automate the nano-process by measuring the parameters in the cycle of storing all the necessary results of the experiment, their mathematical processing and choosing the optimal values of the parameters to calculate the stiffness coefficient.

Claims (1)

A device for determining the stiffness of an elastic suspension of a sensitive element of an accelerometer, comprising an accelerometer, a torque sensor, an adjustable potentiometer, a power source, a rotation angle sensor, a voltage meter, and the first output of the accelerometer is connected to the first input of the torque sensor, the second input of which is connected to the output of the power source, and the third - with the output of an adjustable potentiometer, the second output of the accelerometer is connected to a rotation angle sensor connected in series with a voltage meter, different the fact that it additionally introduces a stepper motor, a clock generator, a key, a torque calculator, two memory blocks, an analyzer, a control signal shaper, an analog-to-digital converter, an elastic suspension calculator for the accelerometer sensitive element, and the output of the moment sensor is connected in series with the first the input of the moment calculator, at the (n - 1) -th inputs of which the signals of the accelerometer passport parameters are supplied, the first memory unit, the analyzer, the output of which is connected to the first input of the second memory block, and the output of the clock generator is connected to the first input of the key, the second input of which is connected to the output of the power source, and the third to the output of the driver of the control signal, the input of which is connected to the second output of the first memory block, the output of the key is connected to the input of the stepper motor and the output of the stepper motor is connected to the input of an adjustable potentiometer, while the output of the voltage meter is connected in series with an analog-to-digital converter, the second input of the second memory unit and the first input ohm of the calculator of the stiffness of the elastic suspension of the sensitive element of the accelerometer, to the (n - 1) -th outputs of which the signals of the passport parameters of the accelerometer are supplied.