SU789797A1 - Apparatus for determining parmonic-signal extremum moment - Google Patents

Description

I

The invention relates to measuring technology and can be used to automate the processing of the results of tests of structures or structures for vibration and shock, 5

 Extreme extrusion devices are known that contain comparator analog storage of a device, voltage-to-phase converters, a generator of rear voltages, a distributor of impulses, triggers of extremum extraction, and logical elements I 1.

 The disadvantage of such devices is the complexity of the circuit.

It is also known a device for determining the moment of extremum of a harmonic signal containing pulse shapers, a key, a logic element AND. 20

A disadvantage of the known device is the low dynamic range.

The purpose of the invention is to expand the dinginic range.

This goal is achieved by the fact that 25 in the device for determining the moment of extremum of a harmonic signal containing a pulse shaper, a key, a logical element AND, an asymmetrical limit is introduced.

and the integrator, the first pulse shaper, asymmetric stop, the integrator and the second pulse shaper are connected in series, the outputs of the first and second pulse shapers are connected to the first and second inputs of the logic element And, the output of which is connected to the output of the device and the control input of the key whose output is connected with integrator control input.

FIG. 1 shows a block diagram of the device; in fig. 2 - stress diagrams.

The device consists of pulse shapers 1 and 2, asymmetric limiter 3, integrator 4, logic element 5, key 6.

The device works in the following way.

A harmonic signal 0 is fed to the input of pulse generator 1. At the output of generator 1, under the influence of the signal Uj, rectangular pulses are produced with durations equal to half the periods (and) and coincide in phase with the input signal, the signal IJL is fed to the inputs of an unbalanced limiter 3 and logic element 5. At the output of the asymmetrical limiter 3, rectangular pulses () with stable amplitudes are formed, and the amplitude of the positive half period is two times smaller than the amplitude of the negative centerline. perio |. Yes (in Figures 2 and 2 and the amplitude oi}.

The signal is fed to the input of the integrator 4. The signal at the output of the integrator 4 is described by the expression

 K i-b | - -r-dct-o, (-,.,),

 i

where T is the period of the output signal. IL, a and O at tQ.

Signal Ud. 2 impulses are fed to the input of the inverter, at the output of which 1 1 rectangular voltage pulses are generated with negative amplitude if U. in and positive amplitude if 1) 0 (signal and 5 in Fig. 2).

The inputs of the logic element And 5 implements the logic o function AND, signals U and 115 are received.

The output signal Uj of the AND 5 logic element is fed to the output of the device and to the input of the key 6. When a positive voltage pulse arrives at the input of the key 6, the key b opens, shorting the capacity of the integrator 4 and setting it to the initial state. A positive pulse Ug appears at time t - T, corresponds to negative negative input signal (at U4 O), and ends at time t T. At the end of the pulse, key b closes, the capacity of integrator b unfolds, and the process described above repeats .

The leading edge of the pulse Uj corresponds to the moment of the extremum of the input signal.

The expansion of the dynamic range is ensured by the fact that in order to determine the extremum moment in the proposed device, it is not necessary to maintain information about the shape of the input signal, regardless of the amplitude of the input signal at the output of the pulse shaper 1, pulses with a constant amplitude are generated.

Claims (2)

1. Author's certificate of the USSR W 375483, cl. G 01 O 1/12, 1971. 2. USSR author's certificate number 368550, cl. G 01 R 19/22, 1970. Fie.2