SU1226324A1 - Apparatus for visual inspection of vibration-testing machine infralowfrequency periodic signal - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is improving the accuracy of control. The device contains a digital transducer 1 of angular displacement, a platform 2 of the shaker of low-frequency accelerations, an analog-digital converter 3, a generator 6 of read pulses, a multiplexer 7, a control pulse generator 8 and an indicator 9. Use of a digital converter of angular displacement, multiplexer, control pulse generator and generator read pulses allowed to ensure continuous monitoring of the output signal of the shaker. 1 il. S

Description

The invention relates to a measurement technique and is intended to monitor and measure infra-low-frequency periodic signals when testing products for the effect of infra-frequency periodic accelerations.

The purpose of the invention is to improve the control accuracy by providing continuous control of the output signal of a shaker with a rotating platform.

The drawing shows a structural electrical circuit of the device.

The device comprises a digital transducer 1 of angular displacement mechanically connected with the axis of the rotating platform of the shaker 2 infra-frequency accelerations, an analog-digital converter 3, a block 4, a digital-to-analog converter 5 a read pulse generator 6, a multiplexer 7, a control pulse driver 8 and an indicator 9. Digital converter 1 has two outputs, the first output for a signal proportional to the angle of rotation of the platform, expressed as a digital code, the second for a pulse signal, corresponding to to treat a single angular displacement of the stand platform, providing an increase in the number at the digital output per unit, while the shaker 2 is connected to the input of the analog-digital converter 3, the outputs of the converter 1 are connected to the first input of the multiplexer 7 and the analog-digital converter 3, the output of which is connected with the first input of block 4, to the second input of which the output of multiplexer 7 is connected,. the other output of block 3 is connected via the imaging unit 8 to the third input of block 4 and the second input of multiplexer 7, the output of generator 6 is connected to the third input of multiplexer 7, the output of block 4 is connected via digital-to-analog converter 5 to indicator 9.

The device works the footing in a skinny way.

When the platform rotates, the instantaneous values of the output signal received on the bench are rigidly and uniquely associated with the digital code generated by the digital transducer.

an angular displacement device, which ultimately provides a tight binding of each instantaneous value of the output signal to a specific cell of the memory block, and in the memory block itself information will be recorded on the output signal for one revolution of the platform, i.e. one period of the output signal. As the platform rotates further, the information in the memory unit will be updated as it arrives, but the condition of strict correspondence to the instantaneous value of the output signal and the rotation angle of the platform will allow information to be updated in the memory unit. Information is recorded in the following order. Rotation of the platform at an angle fixed by the digital transducer 1 of the angular displacement, as a single increment, allows generating the corresponding digital code at the first output of the converter, which goes to one of the inputs of the multiplexer 7, and a pulse signal is generated at the second output, which starts the converter 3 , the latter converts the instantaneous value of the output signal of the stand 2 into a digital code, and this code goes to the information inputs of the memory block 4. In addition, at the additional output of converter 3, a signal is generated, indicating the end of analog-digital conversion, which is converted by the generator 8 into a short control signal for memory block 4 and translates it from p (read) to Write mode, simultaneously the same signal switches multiplexer 7 in such a way that the digital code from the output of the angular displacement transducer 1 is fed to the address input of memory block 4. It should be noted that the recording speed is determined by the speed rotation of the platform, and the number of layers (samples) the number of unit increments recorded by the DIGITAL Converter I of the angular displacements per revolution of the platform.The playback mode takes up most of the time the memory unit is running, since several read cycles occur during a single write cycle. regardless of the recording process;

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at the speed required to obtain a stable picture of the process. In the Read mode, the control signal from the generator 8 permits the passage of the digital code from generator 6 through multiplexer 7 to the address input of memory block 4, and at the output of the latter, digital signals of instantaneous values of the output signal of the stand appear synchronously and sequentially with the appearance of read pulses in a memory unit, and the diffro-analog converter converts these signals to analog form. If the stand output does not change from period to period, then an analog signal takes place at the output of the device, which coincides in shape with the signal coming from the stand output in one period but reproduced at high speed and many times, which allows to get information fixed, convenient to observe a picture of the recorded process.

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Claims (1)

Invention Formula Device for visual monitoring of infra-low-frequency period Compiler G. Examination Editor R. Tsitsik Tehred L. Oleinik Proofreader L. Patay Order 2125/42 Circulation 728 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 ten 26324 vibrostand signal, containing a series-connected analog-to-digital converter, a storage unit, a digital-to-analog converter, and an indicator, which is distinguished by the fact that, in order to improve the control accuracy, a digital angular displacement converter and a multiplexer are introduced into it. , a control pulse shaper and a read pulse generator, wherein the digital angular displacement transducer is mechanically connected to the axis of the rotating platform of the shaker, which is connected to the analog-to-digital input th transducer, the first output of the digital angular movement transducer connected to the first input of the multiplexer, a second input of which is connected generator br shulsov read, the second output digital converter angular movement coupled with the triggering input of the analog-to-digital 25, the other output of which is connected to the control inputs of the multiplexer and the memory unit through the control pulse generator, and the output of the multiplexer is connected to the corresponding input of the memory unit. 15 20