SU1527616A1 - Device for measuring duration of impact effect - Google Patents

Abstract

The invention relates to a measurement technique, in particular, to devices for determining the dynamic characteristics of means for measuring linear acceleration parameters. The purpose of the invention is to improve the accuracy of measuring the duration of the impact. The device contains a constant voltage source 3, the colliding bodies 1 and 2, a pulse generator 4 connected to the input of the first key 7, and a frequency meter 12. The device is configured with a limiter 6, the input of which is connected to the second colliding body 1, and the output is connected to the second input of the first key 7 and the input of the differentiating circuit 9, the output of which is connected to one input of the second counter 10 and the R input of the trigger 11, the output of which is connected to another input of the second counter 10, the output of which is connected to the S input of the trigger 11 other output connected with the input of the second key 5, the other input of which is connected to the output of the first key 7 and the input of the third key 8, the output of the second key is connected to the input of the frequency meter 12 consisting of the first counter 13 connected in series, the decoder 14 and the digital indicator 15, and the output of the first counter 13 is also connected to the third input of the second counter 10, and the second input of the first counter 13 is connected to a button 16, the other contact of which is grounded. 2 Il.

Description

The invention relates to a measurement technique, in particular, to devices for measuring parameters of shock accelerations, and can be used to determine the metrological characteristics of drum sets.

The aim of the invention is to improve the accuracy of measuring the duration of an impact.

FIG. Figure 1 shows the ycTpoilcTsa structural diagram for measuring the duration of an impact; in fig. 2 - voltage diagrams at different points of the circuit, which explain its work.

In the event of a collision between two solid electrically conducting tep, as a result of the contact effects of a spark breakdown, in addition to the impact pulse of duration t uj, pulses of tinkle duration of t an occur before and after the impact.

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the total duration of bounce pulses can reach 15-20% of the duration of the impact.

A device for measuring the duration of an impact (Fig. 1) contains the first 1 and second 2 colliding bodies suspended on current-carrying suspensions, a constant voltage source 3 connected to the first colliding body, generator 4, which performs the function a reference generator and a pulse-forming circuit of a known device, the second key 5, which performs the function of a starting-up circuit of a known device, a driver-limiter 6, the first 7 and third 8 keys, a differential circuit 9, the second counter 10 and three ger 11. Frequency meter 12 is configured as a series-connected first counter 13, deshi | 1) Rathore 14, digital display 15 and buttons 16,

The device works as follows.

Before operation by pressing the button 16, the first counter 13 is set to the original zero state,

At the moment of impact of the first 1 and second 2 bodies, due to the electrical contact, the voltage U from the output of the source 3 of a constant voltage is fed to the input of the form 11. A body-limiting device 6 (U, Fig. 1a) with the limiting level UQ, at the output of which a pulse sequence with steep edges is formed (U ", fig. 26). The first pulse of the sequence, acting on the input of the first key, opens it to pass the clock frequency f to the inputs of the second 5 and third 8 keys. The leading edge of the pulse, separated by differentiating circuit 9, to the recording input of the second counter 10, overwrites the code from the output of the first counter 13. At the same time, the pulse from the output of the differential circuit 9 triggers 1J to the zero state and opens the third key 8, through which the frequency f is fed to the input of the subtraction of the second counter 10. As in

the time of the first pulse of the sequence from the first counter J3 to the second counter 10 is rewritten code zero, then the first pulse of frequency f causes the output

overflow of the second pulse counter 10 (and, fig. 2c), which sets the trigger 11 into one state. When this happens, the second key 5 and the frequency f pulses through

it is sent to the counting input of the first counter 13 (U ,,, Fig. 2e) before the end of the pulse from the output of the limiter 6. Thus, the first counter 13 records a code proportional to the duration of the first pulse of the sequence. Under the action of the second pulse of the sequence, the first key 7 is reopened, with the leading edge in the second

the counter 10 rewrites the code from the first counter 13, the trigger 11 is set to the zero state and the third key 3 is opened. 3 the result of the pulses of frequency f on the subtracting input of the second counter 10 (, Fig. 2d) the code value in it decreases even at the moment of equality to zero the overflow pulse from its output (, fig 2b) sets the trigger

11 into a single state in which the second key 5 opens and the frequency f pulses go to the counting input of the first counter 13 (Uj ,, FIG. 2d) before the end of the second pulse of the sequence. As a result, a code proportional to its duration.

The described operations are carried out until the duration after

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the blowing pulse from the sequence is longer than the previous one. If this condition is not fulfilled, then in the process of subtracting the 1-pulses of the frequency f from the code recorded in the second counter 10, its zeroing does not occur and an overflow pulse does not occur, with the result that trigger 11 remains in the zero state, the second key 5 remains closed and the code in the first counter 13 remains unchanged. Thus, in the first counter 13, a code is fixed that is proportional to the maximum distance of the pulse from the sequence. This code goes to decoder 14 and further to digital indicator J5, where the duration value is displayed in the corresponding dimension and scale.

Device of the device for measuring the duration of the impact, containing a constant voltage source with an input for connection to the first colliding body, a pulse generator connected to the first input of the first key and a frequency meter, approximately 266166

This is because, in order to increase accuracy, a shaper-limiter with an input dp connected to the second colliding body, a differentiating circuit, the second and third keys, the first and second counters, the trigger, the decoder, the indicator and the button, and the output

The Q limiter is connected to the second input of the first key and the input of the differentiating circuit, the output of which is connected to the R input of the trigger, the output of the first key is connected to the input of the second key and the first input of the third key, the second input of which is connected to the first output the key is connected to the first input of the first counter, the second input of which is grounded through a button, and the output is connected to the first input of the second counter and through a decoder with a digital indicator, the output of the third key is connected

25 to the second input of the second counter, the third input of which is connected to the output of the differentiating chain, and the output is connected to the S-output of the trigger.

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Claims (1)

Formula of the invention ^: A device for measuring the duration of the impact, containing a constant voltage source with an input for connecting to the first colliding body, a pulse generator associated with the first input of the first key and a frequency meter, characterized in that, in order to improve accuracy, a shaper is introduced into it - a limiter with an input for connecting to a second shocking body, a differentiating circuit, second and third keys, first and second counters, a trigger, a decoder, an indicator and a button, while the output 1Q of the driver-limiter is connected to the second input of the first key and the input of the differentiating circuit, the output of which is connected to the R-input of the trigger, the output of the first key is connected to the first input of the second key and the first input of the third key, the second input of which is connected to the first output of the trigger, the output of the second key is connected to the first input of the first counter 20, the second input of which is grounded through the button, and the output is connected to the first input of the second counter and through a decoder with a digital indicator, the output of the third key is connected 25 to the second input a second counter, a third input coupled to an output of the differentiating circuit, and an output connected to the S-output of the flip-flop. Fig g