SU613290A1 - Digital-analogue follow-up system - Google Patents

Description

(54) DIGITAL ANALOG FOLLOWING SYSTEM

When the input signal speed changes, the conversion factor of the 5-code-voltage converter automatically changes, the two-channel output keeps the dynamic tracking error at a minimum level, and the depth of the tachometric feedback ensures a decrease in oscillation.

The system works as follows.

At the t-th moment of time, the digital code of the specified function comes from the information source to the first register 1. At the same time, the register / second register 2 is rewritten {the one that was filled in the first register in (/ -1) time of the previous cycle {Receipt of information.

The working (CYCLE digital-analogue servo system consists of two clock cycles. B; first; tact; codes of the first and second registers corresponding to the states of the specified function. In the t-th and (i-1) -th moments, go to, respectively. the first and second inputs of the adder 3 with the regenerator; in their registers. In the cooler (you) reader 3 these codes are compared, and the resulting difference of the codes is recorded in block 4 of the analysis of the rate of change of the input signal.

In the second cycle, the code of the first register enters the first input of the adder 3 with regeneration in the register, and from the output of the converter 13, the code to the second input of the adder 3 is fed to the junction corresponding to the position of the output shaft of the digital-analogue tracking gearbox system. In the adder (subtractor), the codes are compared with the local code, the resulting code difference arrives at the first input of the converter 5, the voltage code, and from its output the signal enters through the comparison device 6 to the input of the amplifier 7, and after amplification, to the engine 9, which reflects There is a mismatch between the position code of the specified function at the i-th moment and the codes of the converter 13. On the output shaft of the motor 9, a tachogenerator iO is installed, the signal from / which enters through the unit 8 changes the feedback ratio to the comparison unit 6, where it is subtracted from the main signal of the transducer 5 jog - voltage.

At the same moment of time (in the second cycle of operation of the servo system) from the outputs of block 4 of the analysis of the rate of change of the input signal, the signal arrives at the second inputs of block 8 of the change of the feedback factor and the converter 5 code — voltage that switches the divisor stages in block 5 and in Converter 5, the code is a voltage, providing a change in the feedback depth and a coefficient. The converter 5, respectively, the increment value (CODA of the specified function per cycle

. receipt of information between the tth and (d-1) -th moment.

With an increase in the rate of change of the input signal, the difference in the codes of this function increases at the tth and (J, -1 )th moments. With THIS. M-block 4, the analysis of the rate of change of the input signal increases the transmission coefficient of the converter 5 and changes the depth of the tachymetric feedback so that

that the quality factor increases and the time constant of the circuit 1 of the drive changes, which reduces the dynamic tracking error and the oscillation of the apalo-digital tracking system for the corresponding range

rate of change of the given function. In the next two-cycle m cycle, the operation of the follow-up system proceeds similarly.

The use of the invention will make it possible to reduce the increase in the dynamic tracking error and the oscillation of the digital-analog tracking system with variations in the rate of change of the assigned function and improve the dynamic characteristics of the system.

Claims (2)

1. Krug E. K., Diligenokiy S. N. Principles of construction of single-digit digital controllers. M., "So; In. radio, 1969. 2. E. Gitis. Information converters for electronic digital computing devices, Moscow, Eporsi, 1970., p. 298-301.