RU1809167C - Device for registering parameters at acceleration- cyclic tests of turbo-unit rotors - Google Patents

Abstract

.Use: in the designs of test benches, to create simultaneously high-speed, temperature and vibration effects on the test object. SUMMARY OF THE INVENTION: the outputs of calculator 1 are connected to a display 2, a printing device 3, and a plotter 5, and the input is to a punched tape information input unit 4, sensors 7 of measured parameters are included in the current signal and voltage transmission circuits to other inputs of calculator 1. The signal transmission circuit of each sensor 7. is made in the form of a series-connected first voltage converter - current in the form of a normalizing amplifier 8, a current-voltage converter 9 and a scale amplifier 10 with output channels, one of which n in the form of series-connected second voltage-current converter 11, a low-pass filter in the form of normalization module 12, switch 13 and analog-to-digital converter 14, and the other channel in the form of series-connected relay element 15, proportional conversion unit 16 and galvanic isolation Visits from the non-measuring part of the circuit and the interrupt signal input module 17. 1 ill. (L C

Description

The invention relates to a turbopump construction and can be used in the design of test benches to create simultaneously high-speed temperature and vibration effects on the test object.

The aim of the invention is to expand the functionality for recording parameters of remote objects and enhancement. noise immunity.

The drawing shows a diagram of a device for recording parameters during acceleration-cyclic tests of rotors of turbine units.

The device contains a calculator 1, the outputs of which are connected to the display 2,

a printing device 3 and a plotter 5, and an input-unit 4 for inputting information from a punched tape, as well as sensors 7 of measured parameters included in the current and voltage signal transmission circuits (not indicated) to other inputs of the calculator 1. The signal transmission circuit of each sensor 7 is made in the form of series-connected first converter. Voltage-current in the form of a normalizing amplifier 8, a current-voltage converter 9 and a scale amplifier 10 with output channels, one of which is made in the form of a second voltage-current converter 11 connected in series, a low-pass filter in the form of module 12

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normalization, switch 13 and analog-to-digital converter 14, and the other channel is in the form of series-connected two-position relay element 1.5, proportional conversion unit 16 and galvanic isolation from the non-measuring part of the circuit and the interrupt signal input module 17.

A device for recording parameters during cyclic acceleration tests of turbine turbine rotors works as follows.

A low-power signal from the M-sensor 7 is fed to the input of a normalizing amplifier 8, which converts this signal into a unified current signal (0-5 A). The choice of the current signal is explained by increased noise immunity and low losses during signal transmission along long circuits in comparison with the output parameters of the sensor 7 in the form of voltage. Further, the signal from the output of the normalizing amplifier 8 is fed to the input of the current-voltage converter 9, where it is converted into a unified constant-voltage signal (0-10 V). From the output of the current-voltage converter 9, the signal is fed to the input of an amplifier 10 having a gain control. Amplifier output

10 signal is input to the converter

11 voltage-current, where it is converted into a unified current signal. As the signal from the N-sensor 7 increases, the output signal of the normalizing amplifier 8 increases, which leads to an increase in the signal at the output of the converter 9. This in turn leads to an increase in the output voltage of the amplifier 10 and the output signal of the voltage-current converter 11. From the output of the voltage-current converter 11, the signal is supplied to the normalization module 12, which serves for low-frequency filtering of the signal by an RC filter. From the output of the normalization module 12, the signal is supplied to the switch 13, which, based on the signal from the calculator 1, selects this signal from the set of signals received to the switch 13 and connects it to the analog-to-digital converter 14 which converts the signal received from the sensor 7 into a binary code (for example, 10-bit). Calculator 1 processes the resulting code by registering it on a printing device 3, display 2, or plotter 5. The signal from the output of amplifier 10

also comes to the relay element 15. having an output signal of logical O (0-0.5 V). e, if the signal at its input does not exceed the specified one. The output signal has a logical value of 1 (0-10 V) if the signal at its input exceeds the specified one. The relay element 15 has an adjustable threshold within 0-10 V. A discrete signal from the output of the relay element 15 is fed to the input of the galvanic isolation unit 16, which incorporates an optocoupler that serves to increase noise immunity. The signal from the output of the galvanic isolation unit 16 is input to the signal input module 17. When the state of the signal changes from logical 0 to logical 1, the signal input module 17 transmits a signal to the calculator 1 by interruption. The received signal, which indicates the excess of the signal from the sensor 7 over a predetermined one, is recorded on display 2 or printing device 3.

Claims (1)

The claims A device for recording parameters during acceleration-cyclic tests of rotors in turbine units, containing sensors of measured parameters included in the circuit for transmitting current signals and voltages to the inputs of the calculator, one input of which is connected to the data input unit from the punched tape, and three outputs are connected respectively to a plotter, display and printing device, characterized in that, in order to expand the functionality for recording parameters of remote objects and to increase noise immunity, the circuit signaling of each sensor is made in the form of a series-connected first voltage-current converter, a current-voltage converter and a scale amplifier with two output channels connected to the calculator, one of which is made in the form of a second voltage-current converter, a low-pass filter connected in series a switch and an analog-to-digital converter, and the other in the form of a series-connected relay element, a proportional conversion unit and galvanic isolation from the non-measuring part of the circuit and the interrupt signal input module. 7i N-sensors