SU577643A1 - Device for controlling vibration exciter - Google Patents

Description

15 and 16, a reversible counter 17, a key 18 and a code-to-analog converter 19.

The output of the generator 1 of a fixed frequency is connected via the generator 13 counting pulses to the input of the frequency divider 14, to the control input of which the speed master is connected to unwind 8, and the output of the divider

Frequency 14 is connected respectively to the first inputs of the first and second coincidence elements 15 and 16, the outputs of which are connected respectively to the summing and subtracting inputs of the reversible counter 17, the outputs of which are connected to the control input of the variable frequency generator 2 through the converter and to one of the the inputs of the first and second comparators 1 1 and 12, the second inputs of which are connected respectively to the setting devices of the upper 9 and lower 10 limits of the frequency range, and the outputs of the comparators 1 1 and 12 are connected respectively to the second inputs of the matching elements 15 and 16, the third inputs of which are connected via the key 18 to the zero potential bus.

A device for controlling a mechanical vibration exciter operates as follows.

A fixed frequency generator signal I is converted in driver 13 to a sequence of counting pulses. These impulses are divided in frequency in the frequency divider 14 and are fed to the same inputs of the element n coincidence.

15 and 16. Through the open element of the match

16 counting pulses arrive at the summing input of the reversible counter 17.

The increasing analogue voltage from the output of the converter, codalog 19, is compared in the comparator II with the voltage of the setpoint 9 of the upper frequency range. As long as the voltage of the equivalent code 19 is less than the setting voltage of the setting device 9, the match element 16 is open. When the voltages at the inputs of the comparator 11 are equal, the comparator overturns and closes the combination element 16, i.e. this prevents the counting pulses from passing to the summing input of counter 17. In this case, npCKpaina increases the voltage at the output of the converter 19. This voltage controls the frequency of the variable frequency generator 2. The frequency of this generator varies in proportion to the voltage. The signal of the fixed frequency generator 1 and the variable frequency generator 2 are combined in the modulator 3. A low difference frequency is detected by the detector 4, amplified in the preamplifier 5 and the MOHI amplifier 6 and fed to the vibrator 7.

As the frequency changes, the low frequency of the excitation changes. The upper limit of the range during the automatic sweep of the excitation frequency is determined by the voltage of the upper limit setting device 9, since the frequency sweep to the large 1 H – 1 frequency stops if the varying voltage from the output of the converter 19 is equal to the voltage of the setting device 9.

If necessary, reverse the drive frequency sweep direction key 18 is shifted to a different position and one of the inputs of the matching element 16 is connected to the zero potential terminal and the matching element 16 is closed. But this opens the coincidence element 15 and through it the counting pulses go to the subtracting input of the reversible counter 17. The decreasing voltage from the output of the converter is similar to code 19 compared in the comparator 12 with the setting voltage of the lower 10 limit of the frequency range. As long as the voltage of the converter 19 is greater than the voltage of the picker 10, the coincidence element 15 is open. When the voltages at the inputs of the comparator 12 are equal, the comparator drops and closes the coincidence element 15, i.e. in this case, the passage of the counting pulses to the subtractive input of the counter 17 is prohibited. The voltage reduction at the output of the converter 19 stops, i.e. the sweep of the frequency towards the lower frequencies stops.

Claims (1)

Invention Formula A device for controlling a mechanical oscillator, containing fixed and variable frequency generators, connected to both inputs of the modulator, the output of which is connected to a vibrator through a detector, preamplifier and power amplifier, in order to improve the accuracy and reliability of control into it the upper and lower frequency sweep rate adjusters, two comparators, count pulse generator, frequency divider, two coincidence elements, reversible counter, key, and A code analog transformer, wherein the output of a fixed frequency generator is connected to the frequency splitter input to the control input, to which the control input of the sweep speed regulator is connected, and the output of the frequency divider are connected to the first inputs of the first and second matches, respectively, whose outputs are connected respectively, with the summation and subtractive inputs of a reversible counter, whose inputs through the code-analogue converter are connected to the control-. I input the variable frequency generator and to one of the inputs of the first and second comparators, the second inputs of which are connected respectively to the setters of the lower and upper limits of the frequency range, and the outputs of the comparators are connected respectively to the second inputs of the matching elements, the third inputs of which are connected . Sources of information taken into account in the examination: I. Copyright testimony of the USSR № 197996 cl. G 01 and 1/00, 1965.