RU2329512C1 - Device for measurement of accelerations - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: invention proposes a sensitive element in systems of stabilisation, navigation and guidance to be used in compensation-type devices of measurement of mechanical magnitudes. The device contains a sensitive element, a pickup of angle, a wideband amplifier, a pick of moments, a positive feedback from the amplifier output to the first converter input, a voltage-to-current converter via the phase detector of the positive feedback, a negative feedback from the amplifier output to the second voltage-to-current converter via the negative feedback phase detector and the filter of upper frequencies, a negative integrating feedback from negative feedback phase detector output to the sign switch input, and, also, a constrained nonlinear component from the output of the positive feedback phase detector to the input of the first voltage-to-current converter and a nonlinear no-sensitivity zone component from the output of the upper frequencies filter to the input of the second voltage-to-current converter.

EFFECT: nonlinear components in positive and negative feedback allows increasing the accuracy of measurement.

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Description

The invention relates to measuring equipment and can be used as an element in stabilization systems for navigation and guidance. It can find application in devices for measuring mechanical values of the compensation type.

A device for measuring accelerations is known (AS No. 742801, IPC ⁶ G01P 15/13, published in BI No. 23, 1980), comprising a sensor, an angle sensor, an integrated feedback amplifier, a torque sensor, an additional integrated amplifier, electronic a key, a threshold element, wherein the first output of the angle sensor is connected through an integrating feedback amplifier to the moment sensor, and the second output of the angle sensor through a threshold element and an additional integrating amplifier is connected to the control input of the electronic key.

The disadvantage of this device is the low accuracy of the measurement, due to the accuracy of the integrating analog amplifiers and the threshold element. In addition, the accuracy of the measurement depends on the parameters of the electronic key circuit that selects the information. The main error of the device is associated with the finiteness of the charge time of the capacitor of the integrating amplifier. This error leads to an aperture error inherent in a similar sampling and information processing scheme.

The closest in technical solution is the device (RF patent No. 2165625, IPC ⁷ G01P 15/13, published in BI No. 11, 04/20/2001) containing a sensing element, an angle sensor, a broadband amplifier and a torque sensor, positive feedback introduced from the output of the amplifier to the input of the torque sensor through a series-connected phase detector of positive feedback and a voltage-current converter, negative feedback introduced from the output of the amplifier to the input of the torque sensor through a series-connected phase detector from negative feedback filter, high-pass filter, voltage-current converter, negative integrating feedback input from the output of the negative feedback phase detector to the input of the torque sensor and containing a series-connected integrating amplifier, a comparator, a waiting synchronous generator, a reversible binary counter, an additional code converter in direct, collection circuit, binary multiplier, smoothing filter, sign switch and synchronization circuit, the outputs of which are the input For comparators and standby synchronous generators, the second output of the comparator is connected to the second input of the reversible binary counter via the standby synchronous generator, while the second output of the reversible binary counter is connected to the second input of the sign switch and the second input of the collection circuit, the output of which is the output of the digital code of the device, in addition, the device contains a reference voltage generator, the outputs of which are inputs to the angle sensor, the phase detector is positive and negative x ties.

The disadvantage of this device is the low accuracy.

The present invention solves the problem of increasing the accuracy of measuring accelerations.

This is achieved by the fact that in the device for measuring acceleration containing a sensing element, an angle sensor, a broadband amplifier, a torque sensor, positive feedback from the output of the broadband amplifier to the input of the first voltage-current converter through a phase detector of positive feedback, negative feedback from the output a broadband amplifier at the input of the second voltage-current converter through a series-connected phase detector of negative feedback, a high-pass filter, neg negative integrating feedback from the output of the phase detector of negative feedback to the input of the sign switch through a series-connected integrating amplifier, comparator, a pair of waiting synchronous generators, a reversible binary counter, the output of which is connected to the inputs of the additional code converter in direct, and the collection circuit, one of the inputs the collection circuit is also connected to the output of the additional code to direct converter, a binary multiplier, a smoothing filter, one of the inputs of the sign a switch is connected to the output of the reversible binary counter, as well as a synchronization circuit, the outputs of which are connected to the comparator input and the inputs of a pair of waiting synchronous generators, and a reference voltage generator, the outputs of which are connected to the inputs of the angle sensor, phase detector of positive and negative feedbacks, a nonlinear link with restriction from the output of the phase detector of the positive feedback to the input of the first voltage-current converter and a nonlinear link with a dead zone from the output ltra highpass input to the second voltage-current converter, the outputs of the first, second voltage-current converters and the sign switch are connected to inputs of an adder whose output is connected to the input and output of the torque sensor reversible binary counter is the output of the digital code.

The drawing shows a block diagram of a device for measuring acceleration.

The proposed device contains a sensing element 1, the angle sensor 2, the output of the angle sensor 2 is connected to the input of the broadband amplifier 3. One of the outputs of the amplifier 3 is connected to the input of the phase detector of negative feedback (FDOOS) 4, and the other output to the input of the phase detector of positive feedback (FDPOS) 5. The input of the angle sensor 2, FDOOS 4, FDOS 5 is also connected to the output of the reference voltage generator (GON) 6. The output of FDOS 5 is connected to the input of a nonlinear link with a restriction zone 7. The output of a nonlinear link with a restriction zone 7 soy inen with the input of the first voltage-current converter 8. The output of the FDOOS 4 is connected to the input of the high-pass filter 9, the output of which is connected to the input of the nonlinear link with the dead zone 10. The output of the non-linear link with the dead zone 10 is connected to the input of the second voltage-current converter 11. The output of FDOOS 4 is also connected to the input of the integrating amplifier 12, the output of which is connected to the input of the comparator 13. The output of the comparator 13 is connected both to the input of the standby synchronous generator 14 and to the input of the standby synchronous generator 1 5. The outputs of the standby synchronous generators (ZhSG) 14 and 15 are connected to the inputs of the reversible binary counter 16, one output of which is connected to the input of the additional code converter in line 17, and the other output of the reverse binary counter 16 is connected to one of the inputs of the collection circuit 18. Another the input of the pickup circuit 18 is connected to the output of the additional code converter in the line 17. The output of the pickup circuit 18 is connected to the input of the binary multiplier 19. The output of the binary multiplier 19 through the smoothing filter 20 is connected to the sign switch input switch 21, the other input of which is connected to one of the outputs of the reversible binary counter 16. The output of the synchronization circuit 22 is connected to the inputs of the comparator 13 and the inputs of the standby synchronous generators 14 and 15. The outputs of the voltage-current converters 9, 11 and the sign switch 21 are connected to the inputs of the adder 23, the output of which is connected to the input of the torque sensor 24.

The internal contents of FDOOS, FDPOS, a comparator, waiting synchronous generators, a reversible binary counter, an additional code converter in a direct line, a collection circuit, an adder, nonlinear links with zones of limitation and insensitivity, a binary multiplier, a sign switch, a synchronization circuit are given in the book: P. Horowitz , W. Hill. The art of circuitry. M.: Mir, t.1-3, 1993.

A device for measuring acceleration works as follows.

Under the action of the acceleration W, the inertial moment acts on the sensor 1, under which the sensor 1 deviates. The deviation is detected by the angle sensor 2, the field winding of which is connected to the output of the GON 6. The signal from the angle sensor 2 after amplification by the broadband amplifier 3 is fed to the inputs of the PDOS 4 and FDOS 5. With the help of FDOS 4, FDOS 5 and GON 6, the phase of deviation of the sensor 1 is highlighted. At the output of FDOS 4, the signal (in the form of voltage) will be in antiphase of the deviation of the sensor 1, and at the output of FDOS 5, the signal in the phase of the deviation of the sensitive element 1. The signal from the output of FDOS 5, in the form of voltage, is fed to the input of a nonlinear link with a restriction zone of 7, and then to the input of the first voltage-current converter 8, the output signal of which is in the form of current , is fed to the input of the adder 23. The input of the adder 23 receives a signal from the negative feedback circuit from the output of the FDOOS 4 through the high-pass filter 9, a nonlinear link with a dead zone 10 and a second voltage-current converter 11. At high accelerations using non-linear link with a restriction zone of 7 eliminates the influence of positive feedback, and at low values of the effective acceleration, the influence of negative feedback is eliminated using a nonlinear link with a dead zone 10. The high-pass filter 9 included in the negative feedback is designed to stabilize the dynamics of the device for measuring accelerations. (A diagram of the implementation of the filter is given in the book by G. Lam. Analog and digital filters. Calculation and design. M .: Mir, 1982, p.127-195.) The signal, in the form of voltage, is also fed from FDOOS 4 to the input of the integrating amplifier 12. The voltage from the output of the integrating amplifier 12 is supplied to one of the inputs of the comparator 13. In the comparator 13, the signal from the output of the amplifier 12 is compared with a signal extracted from a signal that is stable in frequency and amplitude from the output of the synchronization circuit 22. If the signal from the output of the integrating amplifier 12 is greater triangular n conjugation output from the synchronization circuit 22, the output of comparator 13 will be logic high, if less, then the output of the comparator 13 - a low logic level. The signal level depends on the phase of the deviation of the sensing element 1. The signal from the comparator 13, in the form of a level, is fed to the inputs of the waiting synchronous generators 14 and 15, which, using the synchronization circuit 22, give out signals, in the form of a pulse at a frequency of 10 MHz, for each action of the input signal (output 13) equal to "1". The reversible binary counter 16 counts the unit pulses coming from the output of the standby synchronous generator 14 and subtracts the pulses coming from the output of the standby synchronous generator 15. The reverse binary counter 16 represents the positive information in the direct code, and negative in the additional code and the conversion of the additional code to the direct is carried out by the converter additional code in line 17. At the input of the collection circuit 18 receives signals from the reversing binary counter 16, if the deviation ity element 1 in phase EOU 6 and with additional code converter 17 directly, if the phase deviation of the sensor element 1 is equal to 180 °. After the logical addition of the signals by the collection circuit 18, the output signal from 18 is fed to the input of the binary multiplier 19, the output of which will be pulses, the number of which is proportional to the binary code supplied to the input of the collection circuit 18. The binary multiplier 19 converts the binary code to one. The smoothing filter 20, to the input of which pulses are received from the binary multiplier 19, not only eliminates the ripple of the input signal from 19, but also ensures the stable operation of the device, covered by feedbacks of different signs. The current coil of the torque sensor 24 receives a signal from the adder 23, the input of which receives a signal from the sign switch 21, with the sign of the digit of the reversible binary counter 16, and signals from the outputs 8, 11. The torque sensor 24 creates a moment that eliminates the deviation of the sensing element 1 caused by the action of acceleration. The output from the reversible binary counter 16 is the output of the digital code of the device for measuring accelerations.

The positive effect of the proposed device is that it improves the dynamic characteristics, stability and accuracy due to the introduction of non-linear elements. The introduction of non-linear links into the device in positive and negative feedbacks makes it possible to increase the accuracy of measurement, while the values of the restriction and insensitivity zones are directly dependent on the input signal level. Large input effects are compensated by positive feedback, and small negative. By changing the parameters of nonlinear links, you can also increase the sensitivity of the device and expand the range of measurement of accelerations.

Claims (1)

A device for measuring accelerations containing a sensor, an angle sensor, a broadband amplifier, a torque sensor, positive feedback from the amplifier output to the input of the first voltage-current converter through a positive feedback phase detector, negative feedback from the amplifier output to the input of the second voltage converter current through a series-connected phase detector of negative feedback, a high-pass filter, negative integrating feedback from the output of the phase a negative feedback detector to the input of the sign switch through a series-connected integrating amplifier, a comparator, a pair of standby synchronous generators, a reversible binary counter, the output of which is connected to the inputs of the additional code converter in direct, and a collection circuit, one of the inputs of the collection circuit is also connected to the output of the converter additional code in a direct, binary multiplier, smoothing filter, one of the inputs of the sign switch is connected to the output of the reverse binary with a counter, as well as a synchronization circuit, the outputs of which are connected to the input of the comparator and the inputs of a pair of waiting synchronous generators, and a reference voltage generator, the outputs of which are connected to the inputs of an angle sensor, a phase detector of positive and negative feedbacks, characterized in that a nonlinear link is introduced into it with restriction from the output of the phase detector of positive feedback to the input of the first voltage-current converter and a nonlinear link with a deadband from the output of the high-pass filter to the input to of the second voltage-current converter, the outputs from the first, second voltage-current converters and the sign switch are connected to the inputs of the adder, the output of which is connected to the input of the torque sensor, and the output of the reversible binary counter is the output of the device in a digital code.