SU1007019A1 - Linear overload digital meter - Google Patents

Abstract

A DIGITAL LINEAR LOADER METER containing a reference frequency generator and a pulse speed sensor, the outputs of which are connected to the inputs of a control device that has an input of the start and end of the integration, two counters, the first inputs of which are connectors to the outputs of the control device, and a radius setpoint unit different in order to increase accuracy and speed and enhance functionality, it is equipped with units for measuring angular velocity and acceleration. Bohoj & d are connected to the outputs of the control device, a third account, the first input of which is connected to the output of the control unit by two frequency dividers, whose inputs are connected to each other and to the output of the control unit, and the outputs to the third inputs of the first and the third counters, and five code-frequency converters, one input of the first of which is connected to the output of the control unit and one input of the third converter, and the output through the second and fifth converters - to the second inputs, respectively, of the first second and third counters, the output of the third transducer is through the fourth transducer (the driver is connected to the second input of the second counter, when stoM others are connected to the converter inputs, respectively; the first to the output of the radius setpoint unit, the second to the output of the angular velocity measurement unit, the third with the output of the first counter, the fourth with the code of the corresponding number and the fifth with the output of the angular acceleration measurement unit.

Description

Invention-1-onie relates to digital electrical engineering and is intended to measure motion parameters and use in automatic control systems.

Digital linear overload meters are known, whose operation takes place over two time intervals, during the first of which a number proportional to the angular velocity is formed, and the second one converts this number into a time interval filled by the output frequency of the pulse speed sensor. A number proportional to the square of the angular velocity, and, accordingly, whether the acceleration produced by the centrifugal installation. In order to ensure that the digital readout corresponds to the magnitude of the linear rooting at different distances of the center of gravity of the test object from the axis of rotation, in the meter enter the radius setpoint unit Cl

The disadvantages of these meters are reduced accuracy and speed of action, reduced functionality.

The closest in technical essence to the invention is a meter that contains a generator of reference and clock frequencies, a pulse speed sensor, the outputs of which are connected to the inputs of a control device, having an input of the start and end signals of integration and three counters, whose outputs are connected to the outputs of a control device and the output of one of them through the radius unit and the other directly to the inputs of the control unit. By introducing a clock generator and a counter into the device, the meter has a digital count proportional to the linear acceleration integral C2J.

The disadvantages of the known gauge are reduced accuracy and speed. This is due to the fact that the measurement of linear acceleration and the integral of the linear acceleration in it is carried out similarly to the measurement of angular velocity over frequency — the filling of a given time interval with pulses of the output frequency of the speed sensor. The advantage of this measurement is the proportionality of the output value to the parameter being measured.

The opposite is the measurement of the angular velocity over the period, filling the period of the output frequency of the speed sensor with pulses of the reference frequency, the advantage of which is the increased accuracy and speed, and the disadvantage is the inverse proportionality of the output value to the measured parameter;

Indeed, in the known meter both in the first and in the second time intervals, the corresponding numbers are formed by filling the counters with output pulses of the speed sensor. In addition, the need for two time intervals to form linear acceleration numbers and its integral also reduces the accuracy and speed of the known meter. The formation of the linear acceleration integral number in a known meter is carried out by sequential summation of linear acceleration numbers for each cycle. The discreteness of the result obtained in this case will also be determined by a unit lower-order bit, and in the limit by a linear acceleration number, which further reduces the accuracy of the linear acceleration integral.

One of the most important parameters characterizing the operation of centrifugal plants is the linear acceleration gradient. This parameter is not measured by a known device, which limits its functionality.

The purpose of the invention is to improve the accuracy and speed and expand the functionality of the meter.

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The goal is achieved by the fact that a digital linear overload meter containing a reference frequency generator and a pulse speed sensor, the outputs of which are connected to the inputs of the control device, which has an input of the start and end of the integration, two counters, the first inputs of which are connected to the outputs of the control device, and the setpoint unit radius, provided with units measuring angular velocity and acceleration, the inputs of which are connected to the outputs of the control device, the third counter, the first input of which is connected to the output of the mouth control devices, two frequency dividers, the inputs of which are connected to each other and to the output of the control device, and the outputs - to the third inputs of the first and third counters, and five converters Code - frequency, one input of the first of which is connected to the output of the control device and with one input of the third converter, and the output through the second and fifth converters - with the second inputs of the first and third counters, respectively; the output of the third converter through the fourth converter is connected to the second input of the second cell sensor, while the other inputs of the transducers are connected respectively: first with the output of the radius setpoint block the second with the output of the angular velocity measurement unit, the third with the output of the first counter, the fourth with the code of the corresponding number and the fifth with the output of the angular acceleration measurement unit. The drawing shows the block diagram of the proposed meter. The meter contains a control device 1, a reference frequency generator 2, a pulse speed sensor 3, an input 4 of the start and end integration signals, a radius setpoint unit 5, an angular velocity measurement unit 6, an angular acceleration measurement unit 7, 8-12 frequency converters, dividers 13 and. 14 frequency counters 15-17 and input 18 code of the corresponding number. The outputs of the counters 15-17 are the outputs of the meter. The inputs of the control device 1, having input 4 of the beginning and end of integration, are connected to the outputs of the generator 2 of the reference frequency and the pulse sensor 3 of the speed, and the outputs to the inputs of blocks 6 and 7 of the angular velocity and acceleration measurement and the first inputs of the counters 15-17, the inputs Converters 8 and 10 Code - frequency are connected between themselves and to the output of control device 1, and the output of converter 8 through converters 9 and 12 is connected to the second inputs of counters 15 and 17, the third inputs of which are connected to each other through dividers 13 and 14 with in the control device 1, the output of the converter 10 is connected via converter 11 to the second input of counter 16, the information inputs of converters 8-12 are connected to the outputs of block 5 of the radius setpoint, unit 6 measuring the angular velocity, counter 15 of the code of the corresponding number and unit 7 angular acceleration measurements. The meter works as follows. At the output of blocks 6 and 7, angular velocity and acceleration numbers are formed with high accuracy and speed. By filling the pulses of the reference frequency f fj with the generator 2 outputs of the time interval T pT multiple of the period T (n is the multiplicity factor) of pulses coming from the output of the speed sensor 3, in block b the number of the period Hf ff, T fpn T is measured (n 1 T const). Giving this number to the information input of the converter Code - ana. log, and on its other input is the frequency fo, we get at its output the frequency f fjj (where Nf is the capacitance of the transducer counter), the period of which after dividing it by the number n 2 is proportional to the frequency from the speed sensor output 3 and, therefore, angular speed and. Dividing the frequency fn by the number K and filling in the received new period KTg with pulses of frequency f, we obtain at the output of block 6 (taking into account that f Zto / 2J7, where Z is the number of teeth of the speed sensor) a number proportional to the angular velocity, N ui ykYt / 2.l f0. The coefficient K increases the accuracy of the conversion, and by varying it most simply can be obtained a decimal multiplicity factor between W and Hz. By taking the difference in the measurement results of a number in two adjacent time intervals T using a reversible counter in block 7, the number N, 3.j -2Jf7 is proportional to the angular acceleration. . In block 5 of the radius setpoint, the number NP RKp is proportional to the radius R (KP is the proportionality coefficient |. This number goes to the information input of the converter 8 Code - frequency, to another input which is fed through the control device 1 to the reference frequency f from the generator 2 output. the frequency of the converter is 8 fg (where Ng is the capacitance of the counter of the converter 8, chosen equal to the maximum number Ir (). It enters the input of the converter 9, the information input of which is supplied with the number NIJJ from the output of the block 6. Pulses output frequency returns of converter 9) / N8N9 (De Ng capacity of converter counter 9, we assume N9 Nfp) arrive at the input of counter 15 and fill it during the time interval K - | T2. This time is determined by the frequency fj formed in block b (see above) and coming from the output of the control device 1 through the frequency divider 13 (with the division factor K,) to the other input of counter 15. Thus, the output of the counter 15 forms the number N u, 2 proportional to R (2 Jffj2) centrifugal unit at a distance R from the axis of rotation. Dividing and multiplying the value of H) by the acceleration of the force of m, we obtain the relative units of the value of the linear acceleration. . ° OSKN Z C The coefficient K increases the accuracy of the conversion, and by varying it most simply can be obtained a decimal coefficient of multiplicity between WQ and,. The number of MCs from the counter 16 output; arrives at the information input of converter 10 (memory register of the number M (l, for simplicity in the block diagram is not shown), to the other input of which the reference frequency fjj is fed. Output frequency of converter 10 f-, o (the counter bone of converter 10, we assume N ) through converter 11 is fed to the input of counter 16, with which it is integrated. In order to convert relative linear acceleration units to absolute im / s, it is necessary to provide the ratio, numbers located at information input of converter 11, to the capacity of its counter multiple (we will get the number generated at the output of counter 16. N, where t-) and 2 is the arrival time of the start and end integration signals at input 4 of the control unit. Accordingly, the value of the integral linear acceleration VV 2. K kgKZ.o The algorithm for forming a number proportional to the linear acceleration gradient in the proposed meter is based on its expression dW / dt 2u Rdw / dt. The number Nduj / d From the output of block 7, goes to the information input of the converter 12, to another input which receives the frequency fd from the output of the converter S. The pulses of the output frequency of the converter 12 frt2 ° 8 aui / ai f2 ® T have the capacity of the counter of the converter 12 chosen to be the maximum number (Mat,) t, arrive at the input of the counter 17 and fill it during the time interval. This time is determined by the frequency (as well as when forming the number t received from the output of control device i through frequency divider 14 with dividing factor Kz another input 17. A number 2ujRaui / dt proportional to the linear acceleration gradient dW / dt 2u Rduydt is formed at the output of the counter 17. Enter the coefficient dd (as in the definition of WQ) according to the indication of the counter 17, we determine the linear acceleration gradient in relative units of 2uiRai.j7di 3fe (4) a i i / dt The coefficient Kg improves the accuracy of the conversion, and by varying it most simply produces a decimal coefficient of multiplicity between and, i- ,. Ndu, / at. ° Note that the formation of the linear acceleration gradient number | is possible in another way — by taking the difference in the results of measuring the number Njjjj for two adjacent time intervals t (as in the formation of the number, however, studies showed that In this case, it is almost an order of magnitude lower than the measurement accuracy using the proposed algorithm. The formation of linear acceleration numbers and its gradient is carried out simultaneously with the formation of angular velocity and acceleration numbers during each specified time interval. This is what determines the speed of the proposed linear-overload measurement device, which is faster than one or more orders of speed of known meters. The accuracy of measuring linear acceleration numbers, its gradient and integral is ensured by filling the Corresponding time intervals (through converters) with frequency reference pulses and one or more orders of magnitude greater than the accuracy of known gauges. The formation of the linear acceleration integral is reduced continuously between the signals of the beginning and end of the integrators They are filled with a counter by frequency pulses proportional to linear acceleration, which further increases the accuracy of the proposed 1 meter. The proposed algorithm allowed, using the available capabilities of the proposed meter, using simple means and with high accuracy and speed to measure the linear acceleration gradient, one of the most important parameters characterizing the movement, and thus expand the functionality of the digital linear overload meter. Possessing high accuracy and speed, the proposed device can be widely used not only for the purpose of measuring movement parameters, but also for using it in precision digital (analog) systems for automatically controlling movement parameters.

Claims (1)

A DIGITAL LINE OVERLOAD METER containing a reference frequency generator and a pulse speed sensor, the outputs of which are connected to the inputs of a control device having an input signal for the start and end of integration, two counters, the first inputs of which are connected to the outputs of the control device, and a radius setting unit, characterized in that, in order to improve accuracy and speed and expand the functionality, it is equipped with units for measuring angular velocity and acceleration, the inputs of which are connected to the outputs of the device a third counter, the first input of which is connected to the output of the control device by two frequency dividers whose inputs are 'interconnected'> and the output of the control device, and the outputs - with the third inputs of the first and third counters, and five Code-frequency converters, one input the first of which is connected to the output of the control device and to one input of the third converter, and the output through the second and fifth converters is about the second inputs of the first and third counters, respectively, the output of the third A through the fourth inverter connected to the second input of the second counter, the other inputs of the transducers are connected to responsibly; first - yield setpoint unit radius, the second - to You are a. With the stroke of the angular velocity measuring unit, the third with the output of the first counter, the fourth with the code of the corresponding number and the fifth with the output of the angular acceleration measuring unit.