SU830247A1 - Digital meter of shaft acceleration - Google Patents

Description

The invention relates to a technique for electrical measurements of motion parameters and can be used in discrete control and control systems for measuring acceleration of shafts. Devices are known that contain a pulse speed sensor, valves of a time interval generator, a reversible counter and a p-count device, which operate on the principle of counting sensor pulses in cold cycles and measure acceleration as the first velocity difference in the specified G11 cycles. The disadvantage of such devices is the impossibility of measuring the accelerations of both signs and the low speed of the device. A digital shaft acceleration meter is known that contains a pulse sensor located on the shaft and connected to input1 and two circuits I. The other inputs of the generator are connected to the direct and inverse outputs of the generator, and their clocks are connected to the inputs of the addition and subtraction of a reversible counter. The inverter inputs of the latter are connected through an incremental circuit with a single valve group, and the direct outputs are connected to an alternative valve group and a decoder, the outputs of which are connected to the control inputs of the valve groups whose outputs are connected to the reading device G2. The disadvantage of the device is low speed. The purpose of the invention is to increase speed. The goal is achieved by the fact that a summed-round counter, an additional group of gates and two delay elements are entered into the device, with the output of the generator connected by a switch. rarely with the control input of the decoder, through the first delay element - with the control input of the additional valve group, through the second delay element - with the installation input of the summing counter, to the summing input of which the output cxe№J I is connected, the outputs of the bits are connected through an additional group of valves with reversible counter recording inputs. The drawing shows a block diagram of the device. The device includes a shaft 1, on which is located a pulse sensor 2. CKOJpocTH. yakhod last and exit

generator 3 is connected to circuit 4 and whose output is connected to the summing input of counter 5, as well as to the subtractive input of counter 6. The discharge outputs of counter 5 through a group of gates 7 are connected to the input Ivш of the counter 6, the inverse outputs of which are connected through the incrementing circuit 8 with the valve group 9. The direct outputs of the counter b are connected to the inputs of the valve group 10 and the decoder 11 whose outputs are connected to the control inputs of the valve groups 9 and 10 whose outputs are connected to the reading device 12. In addition, the output of the generator 3 is connected indirectly to a control input of the decoder 11 through the delay element 13 is input with the installation of the counter 5 and via the delay element 14 - to the control input of gates 7. Working Group device is as follows.

Generator 3 generates a pulse sequence with a high fill factor. By the cutoff of the next pulse of the generator 3, the circuit 4 is closed. Thus, the flow of the pulses of the sensor 2 to the counters 5 and b is stopped. At the same time, the operation of the decoder 11 is enabled and, depending on whether the counter b goes through the zero state in the pulse counting process of sensor 2 or not, the operation of the valve groups 9 or 10 is permitted. In the first case, the additional counter code 6 is transmitted to the reading device 12 (adding one to the reverse code is done by an incrementing circuit 8) or a forward code of the counter b. At a time interval t | ,, determined by element 14, the census of the number recorded in the counter 5 through gates 7 into the counter b is resolved. Through a temporary inter. the shaft defined by the delay element 13, the information of the counter 5 is erased. Thus, by the time the generator 3 of the next pulse front was formed, the number 6 was recorded in the counter 6

N (i -) - F2. (I -) - T,

F-- is the average value of the frequency of the sensor signal sigde 2 for time T, equal to the duration of the generator 3 pulse.

At. This counter is reset. With the advent of the pulse front generator 3

circuit 4 And opens and the pulses of sensor 2 are fed to counters 5 and b. At the end of the generator 3 pulse, a number will be recorded in the counter b.

Since the frequency F ,, is proportional to the speed of rotation of shaft 1, the code in the counter b at the end of each cycle is proportional to the acceleration of shaft 1. Further, the operation of the device is repeated cyclically.

The duration t of the pause between the pulses of the generator 3 is chosen from the condition t tUjH in the general case is an insignificant part of the period of the pulses of the generator), since the delays are -fr and. are determined by the speed of the element base and are chosen sufficiently small.

Claims (2)

1.Patent UK No. 1396688 cl. G 1 N, pub. 1975. 2. USSR author's certificate for application number 2600469 / 18-10, cl. G 01 R 15/08, 1978 (prototype).