SU1167592A1 - Device for controlling vibration installations - Google Patents

Abstract

1. DEVICE FOR CONTROLLING VIBRATION INSTALLATIONS, contains its fixed frequency generator, the output of which is connected to the first input of the first mixer and through the first frequency divider to the first input of the second mixer, a variable frequency generator, the output of which is connected to the second input of the first mixer and through the second frequency divider - to the second input of the second mixer, the output of which is connected to the input of the low-pass filter, the output of which is the output of the device, the integrator, the output of which is connected to the control named by the variable frequency generator and the limiting amplifier, characterized in that, in order to increase the frequency stability of the output signal of the device, it contains a time interval generator connected by a control input to the output of the first mixer, a clock input to the output of the fixed frequency generator, and output - to the input of the amplifier-limiter, the output of which is connected to the input of the integrator. 2. The device according to claim 1, characterized in that in it the time interval generator contains two D-flip-flops and a counter-divider, and the control input of the form (L of the time-slider is connected to the C-input of the first D-flip-flop, the output of which is connected to the D-input of the second D-flip-flop and to the first input of the divider-counter, the output of which is connected to the S-input of the first D-flip-flop, C-input of the second D-flip-flop and O) the second input of the divisor-counter are connected to the clock input of the ram SP of the time interval, and the output of the second D-flip-flop is associated with output shaper time interval.

Description

1 The invention relates to a testing technique, namely to a device for controlling vibration installations. The purpose of the invention is to increase the frequency stability of the output signal of the device. The block diagram shows the block diagram of the proposed device. The device for controlling vibratory installations comprises a fixed frequency generator 1, a variable frequency generator 2, a first mixer 3, a time interval shaper 4, first and second dividers 5 and 6, a second mixer 7, a low-pass filter 8, an amplifier limiter 9, an integrator 10. In addition, the drawing shows the implementation of the first mixer 3 of the D-trigger 11 and the third divider 12, as well as the execution of the shaper 4 time interval in the form of D-triggers 13 and 14 and the counter-divider 15 Installation in the proposed device dis retnogo first mixer allows extremely simplify the mixer and simultaneously increase the stability of its operation, since the generator 1047 is used for this purpose analog mixer 7, transistors, passive low-pass filter and amplifier driver 7 tran ican. The device works in the following way. The signals from the outputs of the fixed frequency generator 1 and the variable frequency generator 2 are divided by frequency dividers 5 and 6, mixed in the second mixer 7, and the difference signal from the output of mixer 7 through the low-pass filter 8 goes to the power amplifier of the vibration exciter. To increase the frequency stability of the output signal of the device, discrete first mixer 3 and shaper 4 of the time interval are entered into it. A generator of fixed frequency generates a voltage in the form of a meander, which is fed to the first input of the first mixer 3 and to the tact input of the time interval generator. Generator 2 of variable n4 & generates a voltage in the whole meander with a change of frequency 922 which is fed to the second input of the first mixer 3. Mixer 3 is made of serially connected D-flip-flop 11 and divider 12 frequency. Thus, the inputs C and D of such a trigger receive signal voltages in the form of meanders with frequencies, respectively, f, from generator 1 and fn. From generator 2. Due to the change in frequency f, the clock edges of pulses on the Admission coincide alternately with positive half cycles of cobs on D-input, then with negative half-periods of pulses at the D-input, then with negative half-periods of these pulses. D The result at the output of the trigger 11 are pulses with a frequency equal to the frequency difference fm and f, i.e. f fa, - e. Dp increase the stability of the output frequency. This pulse signal is divided in divider 12 by a number acceptable for the selected range, and in general case by p. At the same time, the output frequency of the mixer 3 decreases p times, and the instability of the fronts of the output pulses does not affect the operation of the shaper 4 of the time interval. From the output of the first mixer 3, the pulse voltage with the frequency fi -S goes to the control input of the shaper 4 of the time interval. The shaper 4, according to the command pulse from the control input, forms from a clock sequence with a frequency fa, a pulse of duration C -, where q is the division factor in the counting divider 5, with a repetition frequency f. For normal operation of shaper 4, the ratio tf and shaper 4 operates as follows. In the initial state the trigger 13 is in the single state, and the trigger 14 is in the zero state. At the C input of the first trigger 13, the act of controlling pulses from the output of the first mixer 3 and at the time of their arrival the trigger 13 is transferred to the zero state. The inverse output of the flip-flop 13 is connected to the first input of the counter-divider 15, the second input of which receives clocks with a frequency fip. In the counter-divider 15, the clock pulses are divided by a factor, in the general form, equal q. The signal from the output of the counter-divider 15 flips the trigger 13 into one state at the S-input. Since the inverse output of the flip-flop 13 is connected to the D-input of the flip-flop H, and the C-input of the flip-flop 14 receives clock pulses, the duration of the pulse removed from the inverse of this flip-flop is determined by the conversion factor q of the divisor counter 15 and the generator frequency f fixed With the output time of the imaging device A of the time interval, pulses of a calibrated duration with a repetition frequency f, are fed to the amplifier-limiter 9, where they are calibrated in amplitude. Calibrated in duration and amplitude from the output of the limiter amplifier 9 are fed to the signal input of the integrator 10, to the control input of which it supplies voltage either from a manual frequency control potentiometer or from a sawtooth voltage sweep generator or from a sawtooth voltage generator frequency sweeps (not shown). Since the average value of the voltage calibrated in amplitude and duration of the pulses is directly proportional to their frequency, a control voltage is inserted at the output of the integrator 10, the value of which depends on the difference in the average values of the voltages at the inputs of the integrator 10, i.e. from the difference between the established and actual frequencies. This control voltage is applied to the input of variable frequency generator 2 and changes its frequency so that the difference between the set and actual frequencies V decreases. The presence of the integrator 10 in the frequency control circuit allows it to get a static control zero.

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Claims (2)

1. DEVICE FOR CONTROL VIBRATION UNITS, comprising a fixed frequency generator, the output of which is connected to the first input of the first mixer and through the first frequency divider to the first input of the second mixer, a variable frequency generator, the output of which is connected to the second input of the first mixer and through the second divider frequency - to the second input of the second mixer, the output of which is connected to the input of the low-pass filter, the output of which is the output of the device, an integrator whose output is connected to the control input m of a variable frequency generator, and an amplifier-limiter, characterized in that, in order to increase the frequency stability of the output signal of the device, it contains a time interval shaper connected by a control input to the output of the first mixer, a clock input to the output of a fixed frequency generator, and an output - to the input of the amplifier-limiter, the output of which is connected to the input of the integrator. 2. The device according to claim 1, characterized in that the time interval former comprises two D-flip-flops and a divider counter 5, the control input of the time interval former being connected to the C-input of the first D-trigger, the output of which is connected to D-input of the second D-flip-flop and to the first input of the divider counter, the output of which is connected to the S-input of the first D-flip-flop, the C-input of the second D-flip-flop and the second input of the divider-counter are connected to the clock input of the time interval shaper, and the output the second D-trigger is connected to the output of the form Vatel timeslot. The block diagram of the device is shown. for vibration control