SU1363177A2 - Device for introducing values of measured parameters of quick-changing and pulsating flows of liquids and gas into computer - Google Patents

Abstract

The invention relates to devices for automating the measurement and analysis of the parameters of non-stationary flows of liquid and gas, in particular the thermophysical parameters of processes in transition modes. The purpose of the invention is to improve the reliability of the input information — parameters of liquid and gas flows having an electrical equivalent in the form of an alternating voltage frequency, by eliminating measurement error due to the discreteness of the frequency of the clock generator (T) in the frequency converter — the code at the beginning of the measurement period frequency (T). For this purpose, the filling of T with the frequency T is carried out only when the short pulses of adjustable duration, formed respectively from the leading fronts T,;, and T, coincide. 1 il. (L 00 o 00 MS)

Description

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The invention relates to computational and instrumentation technology, is intended to automate the measurement and analysis of parameters of non-stationary flows of liquid and gas, and can be used to measure the thermophysical parameters of processes in stationary and transient modes.

The aim of the invention is to increase the measurement accuracy.

The device contains a generator of 1 reference pulses, a register 2, a decoder of 3 addresses, a current time counter 4, a voltage converter 5 into a code, a frequency converter 6 into a code, a switch 7, a multiplexer 8, informational inputs 9 of the device, a channel 10 micro-commands, a gene RATI I 1 clock pulse, block 12 of memory of micro-commands, block 13 of control, arithmetic-logic block 14, decoder 15 of an external device, block 16 of special control signals, block 17 of channel representation, block 18 of interrupt control, block 19 of control of a channel scarlet resident memory block 20, transceivers 21, channel interface block 22, timer 23, input-output block 24, memory block 25, delay element 26, first pulse shaper 27, second pulse shaper 28, AND element 29.

The device also includes power supply units, a control panel and blocks.

information displays (not shown)

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The main functional block of the central processor is a microprocessor set of large integrated circuits (LSI).

The elements of the set are connected to each other by a 22-bit channel of 10 microcommands. All information exchange between the microprocessor and the channel interface unit 22 is carried out through the arithmetic logic unit, and the communication with the control signal lines of the channel interface unit 22 via the control unit 13.

The synchronization of the operation of all the CPU units is provided by four series of non-overlapping clock signals of generator II.

The control unit 13 communicates the microprocessor with the control signal lines of the interfacing unit 22.

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neither a channel through the channel control block 19, but also generates a sequence of microinstructions addresses that are used to access the microcommand memory block 12. The number of addresses of block 12 is determined by the current contents of the micro-instruction counter, executed by the command j of the current micro-command, interrupt control signals and some other special signals.

The arithmetic logic unit 14 is designed to perform arithmetic logic transformations on the data and to perform information exchange with the channel interface unit 22.

The microinstructions memory block stores microcommands that emulate the Electronics-60 computer command system, communication operations with the console terminal and the initial start-up program.

The decoder 15 of the external device is designed to generate during the address part of the channel cycle a signal that the address goes to the registers of external devices whose addresses are in the top 4K of the address space. The exchange of information between the central processor and other blocks 2,3,8,23 - 25 is performed

by means of standard access cycles to the channel interface unit 22.

Each external unit can have several different registers whose addresses are given by the corresponding jumpers on the address comparison inputs.

Block 16 of special control signals is designed to perform operations on the initial installation of channel devices, memory regeneration, as well as to implement some internal operations of the central processor.

The channel representation unit 17 provides for the use of the channel interface unit 22 by both the central processor and the direct memory access units.

The central processor controls the allocation of time of use of the channel interface unit 22 for information exchange by the timer 23, the input-output unit 24, the memory unit 25 and others, and also performs all the necessary arithmetic-logical operations for information processing. Whole

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information and control signals are exchanged under the control of the central processor through a single channel interface unit 22 using 16 data address lines and 18 control lines. And the 32 lines are bidirectional. This means that the information on the same line can both be received and transmitted relative to the same block. Thus, in accordance with the program previously recorded in block 25 of memory, the central processor provides the address control of the switches of switch 7, starts up voltage converter 5 into a code, or triggers frequency converter 6 into a code when it matches. element 29 of a short pulse from the leading edge of the period of the measured frequency (27) with a short pulse of the frequency generator of the frequency converter to the code (28), conjugation of the counter 4 of the current time, converters 5 and 6 multiplexer 8 with block 22.

The delay time of the element 26 must be no less than the delay time of the signal in the driver 27, element 29 and in the input circuits of the control input of the frequency converter 6 in the code.

The control of starting converter 5 or 6, the current time counter 4 and multiplexer 8 is carried out using a 3 address decoder. The address control of the channels of the switch 7 is carried out with the help of. register 2.

The timer 23 in the computer is designed to form and transfer to block 22 constant time intervals, on the basis of which the main program is interrupted to calculate the total current time with a constant step. A timer interrupt differs from an interrupt coming from an external unit with a higher priority and in that the address of the vector is not required to start the interrupt service routine, since the service starts through a vector with a previously known address. This address is reserved for interrupting the timer.

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The current time counter 4 is intended for counting the pulses from the generator 1 of the reference pulses and in the time interval between two pulses of the timer 23.

High accuracy of binding the results of measuring the parameters of fast-variable and pulsating flows of liquid and gas to the current time at the time of measurement is achieved by the fact that in the time interval between two timer pulses the current time at the time of the change is recorded by the counter, the code from which the multiplexer transmits and is a vernier correction to the current time program value at the time of measurement, generated by the timer pulses, causing the computer program to interrupt to calculate the time Meni in one of the memory cells.

Device 1 works as follows.

In computer block 25, a general program for measuring and analyzing the parameters of unsteady fluid and gas flow is recorded in advance. The program is recorded in block 25 through block 22 by an information input device of block 24 under the control of a central computer processor.

During the operation of the device, the computer performs the following tasks: program input; automatic control of the program in real time; in accordance with the program, automatic control of measurement, registration of parameters, mathematical and logical processing of measurement results, taking into account the nonlinearity of the calibration characteristics of sensors, transducers; bringing the measurement results to a physical scale; calculation of interconnected, directly non-measurable parameters. I.

Common to most of these tasks.

 is the measurement of the signal from the sensor (primary converter) on the selected channel of the switch 7, and recording in parameter 25 the value of the parameter from the output of one or another converter 5 or 6 (depending on the channel number) using multiplexer 8 and block 22 s simultaneous recording of the current time at the time of measurement. The signal from the timer 23 through the block 22 acts513631

The device receives time signals and supplies generator 1 and counter 4. The device information input is connected to the output of computer unit 22 g, through which a channel address code for the measured flow parameter from one of the sensors is fed through register 2 to switch 7 input.

Switching the addresses of the running converters 5 or 6, and then (in accordance with the program in block 25), the transmission of information from counter 4 or converters 5 and 6 to the computer is controlled by the address input of the device by the decoder 3 addresses. In this case, the start of the frequency converter 6 into the code is successful only when two short pulses in the AND 29 element coincide, formed by the formers 27 and 28, respectively, from the front of the period of the measured frequency r T and the leading edge of the period of the clock generator frequency Tf.,. fixing the coincidence of these pulses, the element 29 gives a signal to the control input of the frequency converter 6 in the code. The adjustable pulse duration of the formers 27 and 28 allows one to more accurately determine their coincidence on the AND 29 element.

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Claims (1)

Thus, in order to increase the accuracy of conversion of the measured frequency to the code, the filling of the period of the measured frequency Tu with the frequency of the clock generator begins at the moment of coincidence of the edges TX and Tr, i.e. the error is excluded, due to the discreteness of the account, at the beginning of the measured period T, the formula of the invention A device for inputting into the electronic computer a machine of the values of the measured parameters of fast-variable and pulsating flows of liquid and gas by the auth. No. 1054824, that is, in order to increase the measurement accuracy, the device contains a delay element, the first and second pulse shapers and the And element, the inputs of the first pulse generator and the delay element are connected to the second output of the switch, the output of the delay element is connected to the second input of the frequency converter in the code, the auxiliary output of which is connected to the input of the second pulse shaper, the inputs of the And element are connected to the outputs of the first and second pulse formers, and the output of the And element is connected to start input frequency converter in the code. Editor T. Parfenova Compiled by A. Zhenin Tehred L. Oliynyk. Proofreader L. Pilipenko Order 6362/39 . Circulation 671 Subscription VNIIPI State Committee - USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4