SU617738A1 - Arrangement for determining moments of harmonic extremum values - Google Patents

Description

one

The invention relates to the field of computer technology and to be used in automated systems for the design of vibration.

Devices are known for determining the moments of extrema using the principle of determining the moment of change of the sign of the derivative of the signal under study 1J. Their disadvantage is the relatively narrow frequency and amplitude di: apazons.

It is also known a device for determining MOMeHTOiB extrema, which contains a driver, a generator of reference pulses, three AND gates, two triggers, a reversible counter, and a waiting generator 2j. The drawback of the device is also the narrowness of the ampere n frequency ranges.

The aim of the invention is to expand the amplitude AND frequency dianazones. To achieve this goal, in the device the input terminal is connected to the input of the driver, the output terminal is connected to the input of the driver, the output of which is connected to the first inputs of the flip-flops; the output of the first of them is connected to the summing input of the reversible counter, and the output of the second trigger is connected through the first logic element I to the subtracting input of the reversible counter; second

the input of the nerve logical element I is combined with the input of the second logical element I and is not connected to the output of the generator / ator of the reference signals; the other input of the second logic element I is connected to the output of the driver and the control input of the reversing counter, and the EXIT (the second logic element AND is connected to the second input of the nerve trigger; one ns

the inputs of the third logic element I are connected to the output of the imaging device, and the other input - with the inverse output of the reversible counter; the output of the third logical element I is connected to the input of the waiting generator, the output of the iKoroporo is connected with the second input of the second trigger.

A block diagram of the proposed device is shown in the drawing. It contains the driver 1, the reversible counter 2, the generator 3 reference pulses, the logical element And 4, the triggers b n 6, the logical elements And 7 and 8 and the waiting generator 9.

Input harmonic signal

to the input of the former 1, at the output of which rectangular pulses are formed. Let the positive half period of the input signal at the output of the driver 1 be the voltage (signal "1), and

negative nolupole tension

equal to zero (signal “O). The signal "1 at the output of the imaging unit 1 sets the reversible counter 2 into the summed mode and enables the pulses with a stable frequency from the generator 3 to pass through the logic element AND 4 to the input of the trigger 5. At the same time, the trigger 6 and the output of the logic elementite 7 The impulses from the generator 3 reference pulses are missing. While at the output of the imager 1 there is a signal “1, 11rigger 5 and a reversible counter 2 sum the pulses of a stable frequency.

When the output of the driver 1 of the signal "About the logic circuit AND 4 is closed" is triggered, the trigger 5 goes into the initial state, in the reversible counter 2 the subtraction mode is set and the state 6 changes its state. stable frequency pulses appear, which begin to be subtracted from the number previously counted by a reversible counter 2. The subtraction process is twice as fast as summation, so "a stable frequency pulses do not pass through the trigger 5. WHEN is the reversible counter IR 2 is set to the zero state, the output of the logic circuit AND 8 is a signal that triggers the wait generator 9, which returns the trigger 6 to the initial state. In this case, the arrival of stable frequency pulses at the input of the reversible counter 2 is stopped. At the pulse impulse output of the waiting generator 9, it coincides with the moment when the negative semi-period reaches an extreme 1 magnitude. A new measurement cycle will begin when the output of shaper 1 of the signal "1.

The device allows to determine the moments of extremum of one sign for harmonic sipnals.

The extension expands the amplitude and frequency ranges, since to determine the moment of the extremum, it is not necessary to preserve the shape of the input signal.

Claims (2)

1. USSR author's certificate number 368550, cl. G 01R 19/22, 1970. 2. USSR author's certificate number 436298, cl. G 01R 19/02, 1972.