RU2429492C1 - System to measure linear acceleration parameters - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: invention may be used to measure acceleration, acceleration variations, integration time, linear acceleration integral, and constant voltage in tests at centrifugal units. Proposed system comprises address decoder, speed discrete transducer signal recorder, contact operation recorder, interruption request unit, frequency signal registration unit, discrete output unit, analog I/O unit, controller, network interface module, analog I/O unit control circuits and indicator.

EFFECT: expanded frequency range of speed discrete transducer signal registration, possibility to use Ethernet channel as interface.

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Description

The invention relates to the field of measuring equipment, namely to automated control systems, and can be used to measure the value of acceleration, rate of change of acceleration (front), integration time, linear acceleration integral, monitoring the state of contacts, measuring the value of constant voltage and generating constant voltage at test on centrifugal units (TsU).

The Orbit automated system is known (See the collection of reports of the scientific conference "Youth in Science", "Automated system for monitoring linear loading parameters on programmable logic integrated circuits" p. 434, published by Sarov, FSUE RFNC-VNIIEF. 2002 .), which allows to measure linear acceleration parameters using the indirect method of the measured angular velocity of the centrifuge: instantaneous values of acceleration, rate of change (fronts) of acceleration, acceleration integrals in the interval between contacts tested instruments, integration times. In the process of linear acceleration, a continuous sequence of periods of the signal of a discrete speed sensor (DDS) of a centrifugal machine and the moments of operation of the contacts are recorded. As a result of processing the primary information, the linear acceleration parameters are calculated at the moments of contact operation.

The system of measuring and monitoring linear acceleration parameters "Orbit" contains one channel for registering a signal of the DDS CPU, consisting of a series-connected high-pass filter and a frequency divider, a unit for recording the status of contacts, an interrupt unit, a memory register, the first, second and third counters, a differentiator, an inverter and a crystal oscillator, the output of which is connected to the second inputs of the first, second and third counters, the output of the frequency divider is connected to the first input of the interrupt unit, the first input of of the counter, the inverter input and the input of the differentiator, the output of which is connected to the first input of the third counter, the inverter output is connected to the first input of the second counter, the output of the contact detection unit is connected to the second input of the interrupt unit and the second input of the memory register, the first input of which is connected to the output the third counter, the outputs of the first, second and third counters, the output of the memory register and the output of the interrupt unit are connected to the computer data bus.

The above system is the closest in technical essence to the claimed system and therefore is selected as a prototype.

The following disadvantages can be noted in the Orbit system:

- the use of an obsolete ISA interface bus as a computer communication interface, which does not allow the system to be used on modern computers;

- the first and second counters work alternately and overflow when the frequency of the input signal of the DDS is below 25 Hz, which makes it impossible to control the initial acceleration of the control unit;

- there is no possibility to control and issue analog signals.

The task to be solved is the creation of a measurement and control system with advanced functionality.

Achievable technical result is the expansion of the frequency range of the DDS signal registration channel, the use of the Ethernet interface for communication with a PC, the measurement and generation of analog voltage signals.

To achieve a technical result in a linear acceleration measurement and control system containing an address decoder, a signal recording unit of a discrete speed sensor and a contact detection unit, the inputs of which are inputs of a measurement and control system, and the outputs are connected to the first and second inputs of the interrupt request block, respectively , new is that in addition a frequency signal recording unit, a discrete output unit, the outputs of which are the outputs of the measurement system and trol, analog output and input blocks, the outputs and inputs of which are respectively the outputs and inputs of the measurement and control system, controller, network interface module, control circuits of analog input and output blocks, an indicator, the input group of which is connected to the controller output group, input interrupt which is connected to the output of the interrupt request block, the third input of which is connected to the output of the frequency signal registration unit, the input of which is an input to the measurement and control system, a group of data input-outputs, the group of address outputs, the first and second outputs of the controller are connected respectively to the first group of address inputs, to the second group of address inputs, the first and second inputs of the address decoder, the outputs of which are connected, respectively, to the fourth input of the interrupt request block, the input of the signal recording unit of the discrete speed sensor , the input of the frequency signal registration block, the input of the contact response registration block, the input of the discrete output block, the inputs of the analog input and output blocks, the input of the network module interface, inputs of control circuits of analogue output and input units, groups of outputs of which are connected respectively to input groups of analogue output and input units, a group of inputs / outputs of controller data is connected to a group of inputs and outputs of an interrupt request unit and a network interface module, a group of inputs of a signal registration unit discrete speed sensor, frequency signal recording unit, discrete output unit, analog output unit, control circuits of analog input and output units, group of outputs of the re contact actuation and analog input block.

Introduction to the inventive system of measurement and control of linear acceleration parameters of analog input and output blocks and control circuits of these blocks allows you to control and issue analog signals.

The introduction of the network interface module allows you to use the Ethernet channel as a communication interface, and the use of two built-in controller timers allows you to expand the frequency range of the DDS signal registration channel.

The drawing shows a diagram of the inventive system.

The system for measuring and controlling linear acceleration parameters includes a controller 12, which contains two built-in timers, a unit for recording a signal of a discrete speed sensor 1, a unit for registering a frequency signal 2, a unit for detecting the operation of contacts 3, a unit for discrete output 4, an analog input unit 5 and output 6, a module network interface 10, control circuit of the analog input unit 7, control circuit of the analog output unit 8, indicator 13, address decoder 11, interrupt request unit 9. Outputs of the discrete signal registration unit yes speed sensor 1, frequency signal recording unit 2, contact response detection unit 3 are connected to the first, second and third inputs of interrupt request block 9, the output of which is an interrupt request signal of IRQ controller 12. Inputs-outputs of Addr / Data of controller 12 are connected to inputs- the outputs of blocks 1-11 and are multiplexed signals of the address / data, outputs Addr of the controller 12 are connected to the inputs of the decoder address 11 and are signals of the upper digits of the address. The outputs of the address decoder 11 are connected to the inputs of blocks 1-10 and are the selection signals for allowing the exchange of data via a common bus. The outputs of the control circuit of the analog input unit 7 are connected to the inputs of the analog input unit 5 and are control signals that specify the number of the measured channel and the gain of the input signal. The outputs of the control circuit of the analog output unit 8 are connected to the inputs of the analog output unit 6 and are control signals built into the analog output unit of the DAC. The inputs of the indicator 13 are connected to the outputs of the controller 12.

The linear acceleration measurement and control system measures the duration of the DDS and F _Bx signal periods, measures the voltage values at the analog inputs Ain1-Ain16, generates a constant voltage at the outputs Aout1-Aout4, monitors the status of the digital inputs K1-K24, sets the status of the digital outputs N1- N16. The values of the input and output signals are digitized and stored in the controller memory. The controller generates data packets that are transmitted through the network interface module to the computer. The system operates under control of a program code executed by a controller 12. The program code contains procedures for writing / reading data from blocks 1-10 through a common data bus. Each of the blocks is assigned an address, when accessed, data is exchanged between the controller and this block.

Measurement and installation of signal values is as follows. A periodic DDS signal is fed to the input of the DDS 1 signal registration unit. The DDS 1 signal registration unit contains a digital high-pass filter, a frequency divider and a differentiator. The DDS 1 signal registration unit generates short pulses on both edges of the DDS input signal. These pulses are fed to the first input of the interrupt request unit 9. The frequency signal 2 registration unit is identical to the DDS 1 signal registration unit and generates short pulses on both edges of the input signal F _in , arriving at the second input of the interrupt request unit 9. The contact detection unit 3 generates a short the pulse at any change in the state of inputs K1-K24, arriving at the third input of the interrupt request block 9. The state of the contacts is determined by reading the data from the contact response recording unit. The interrupt request block 9 generates a “generalized” IRQ interrupt request signal from the controller 12. The moment of arrival of the IRQ signal is determined programmatically using two built-in timers of the controller 12, the second timer being used to count the number of overflows of the first timer. The controller 12 switches to the interrupt processing routine and reads the values of the timers, thereby fixing the moment the interrupt occurred. The minimum recorded time interval t _min is determined by the duration of the interrupt processing program. If pulses from the DDS signal recording unit, the frequency signal recording unit, and the contact response recording unit arrive for a time interval shorter than t _min , the sequence of their occurrence and the time interval between them are determined by reading data from the interrupt request unit 9. Discrete output unit It is a 16-bit register, the outputs of which are galvanically isolated from an external device and are system outputs. The state of the outputs is set by writing the binary code to the discrete output block. The measurement of the voltage value at the analog inputs Ain1-Ain16 is as follows. The controller 12 performs a cycle of writing binary code to the control circuit of the analog input unit. This code contains the gain and channel number for which you want to measure. Next, the control circuit of the analog input unit gives an impulse to start the conversion of the steady-state value of the input voltage to a binary code. The voltage value is obtained by reading the binary code from the analog input block 100 μs after the output of the conversion start pulse. The DC voltage level at the outputs Aout1-Aout4 of the analog output block is set by writing the binary code corresponding to the voltage level to the analog output block and the control circuit of the analog output block. The control circuit block analog output performs the function of an intermediate buffer. The alphanumeric indicator 13 is connected to the controller 12 through a separate bus and is required to display the status of the system.

To confirm the practical feasibility of implementing the invention, a prototype of a measurement and control system was made and tested, made according to the diagram shown in the drawing. The tests carried out confirmed the feasibility of the claimed system and the possibility of implementing the following technical characteristics:

- the range of input frequencies of the signal DDS and F _in from 0.1 to 24000 Hz;

- the limit of the main relative error in measuring the periods of the signal of the DDS and F _x 0,01%;

- resolution of the channel for monitoring the state of contacts at least 50 μs;

- the resolution of the discrete output channel is at least 200 μs;

- sampling frequency of analog signals at least 1000 Hz.

Claims (1)

A linear acceleration measurement and control system comprising an address decoder, a discrete speed sensor signal registration unit and a contact response registration unit, the inputs of which are inputs of a measurement and control system, and the outputs are connected to the first and second inputs of the interrupt request unit, respectively, characterized in that In addition, a frequency signal recording unit, a discrete output unit, the outputs of which are the outputs of the measurement and control system, analog output and input units, the strokes and inputs of which are respectively the outputs and inputs of the measurement and control system, a controller, a network interface module, control circuits for analog input and output blocks, an indicator, the input group of which is connected to a group of controller outputs, the interrupt input of which is connected to the output of the interrupt request block, third the input of which is connected to the output of the frequency signal registration unit, the input of which is the input of the measurement and control system, the group of data input-output, the group of address outputs, the first and second The controller’s odes are connected respectively to the first group of address inputs, to the second group of address inputs, the first and second inputs of the address decoder, the outputs of which are connected respectively to the fourth input of the interrupt request block, the input of the signal recording unit of the discrete speed sensor, the input of the frequency signal registration block, the input of the block registration of contact operation, input of a discrete output block, inputs of analog input and output blocks, input of a network interface module, inputs of control circuits of blocks analog output and input, the output groups of which are connected respectively to the input groups of the analog output and input blocks, the controller data input-output group is connected to the input-output group of the interrupt request unit and the network interface module, the group of inputs of the signal recording unit of the discrete speed sensor, registration unit frequency signal, discrete output unit, analog output unit, control circuits of analog input and output units, group of outputs of the contact response recording unit and the an analog trunk input.