SU781598A1 - Apparatus for determining dynamic mechanic characteristics of substances - Google Patents

Description

one

The invention relates to a measurement technique and can be used to study the structural features and the physicomechanical properties of substances in all physical states.

The closest in technical essence to the invention is a device for determining the dynamic mechanical characteristics of substances, comprising an electronic unit including upper and lower level comparators, an electronic key including a coincidence circuit, and a driver connected to its output 1,

The drawback of the device is low accuracy due to the uncertainty of the operation of the comparators and the electronic key at the moments when the amplitude of the exponentially decaying signal approaches the values of the upper and lower discrimination thresholds. The purpose of the invention is to improve the accuracy

The goal is achieved by the fact that the device is equipped with an inverter, the electronic KJD04 is designed as a logical circuit of two triggers on AND and NOT elements with two inputs, the first of which is connected to the output of the upper level comparator, and the second is connected to the lower level, the other trigger is connected to one input the output of the first trigger, the other with the output of the low level comparator 5 through the inverter, and the first input of the coincidence circuit is connected to the output of the first trigger and the second to the output of the inverter.

FIG. 1 is a schematic isobris 0 but a device for determining the dynamic mechanical characteristics of substances; in fig. 2 shows voltage plots, ° where a) an exponentially decaying f5 signal from the output of the measuring transducer (not shown in the diagram);

b) pulses at the first input of the first trigger;

20 c) pulses at the second input of the first trigger;

d) pulse shape at the output of the first trigger;

d) pulses at the output of the inverter -, 25 e) pulses at the output of the second

trigger;

g) pulse shape at the output of the coincidence circuit;

h) pulses at the output of the electronic shaper.

thirty

A device for determining the dynamic response of mechanical mechanisms, contains an electronic unit, including comparators 1 and 2 of the upper and lower levels, an electronic key, including a circuit of 3 matches and a shaper 4 connected to its output.

The device is equipped with an inverter 5. Electronic: the key is made in the form of a logic circuit of two triggers 6 and 7 on the elements AND and NOT with two inputs, the first of which is connected to the output of the comparator 1 upper level, and the second - to the comparator 2 lower level through the inverter 5 , and the first input of the circuit 3 matches under; is connected to the output of the first trigger 6 and the second to the output of the inverter 5. The device works as follows

obrzhagb. ;;

Exponentially damped prod. A clocked signal from the output of the converter (not shown in the diagram) is fed to the inputs of Comparators 1 and 2 of the upper and lower levels. The ratio of discrimination levels is equal to the natural logarithm, i.e.

- 2.7, where And - is the top level of discrimination - - jj-gmfijv - -; ---

And - the lower level.

The pulses from the output of the upper level comparator 1 trigger the trigger 6 along 1 Ш5ВШ1Г в ХБу V computer. The lower level 2 flips the trigger b on the second input. From the output of the trigger 6, the pulses arrive at the first input of the second trigger 7, To the second input of the trigger f, pulses from the output of the comparator 2 of the lower level through the inverter 5.

The coincidence circuit 3 transmits to the shaper 4 pulses from the comparator 2 of the lower level only with the maximum voltage value at the output of the trigger 7. The pulses from the shaper 4 are recorded, and the number of pulses will be equal to the reverse double value of the logarithmic decrement, i.e.

Lz jj "

where N is the number of pulses from the output

shaper.

The main advantage of the present invention is measurement accuracy.

Claims (1)

Invention Formula A device for determining the dynamic mechanical characteristics of a Substance containing an electronic unit including upper and lower level Comparators, an electronic key including a coincidence circuit, and a driver connected to its output, characterized in that it is equipped with an inverter to improve accuracy in the form of a logic circuit of two triggers on None NOT elements with two inputs, the first of which is connected to the output of the comparator of the upper level, and the second - the lower level, the other trigger one Connected swing b output of the first flip-flop, the other - with a yield kokscharatora nnvertor through the lower layer, and a first input of a coincidence circuit connected to the output of the first flip-flop and to the output of the second inverter. Sources of information taken into account in the examination 1. USSR author's certificate  500500, cl. G 01 N 29/00, 1976 (prototype). four IV s