Method to search for faulty block in discrete dynamic system
FIELD: information technologies.
SUBSTANCE: previously a reaction of a knowingly good time-discrete system is registered for discrete beats of diagnostics with discrete permanent pitch in the observation interval at reference points, and integral estimates of output signals of the discrete system are determined repeatedly (simultaneously) for the values of the discrete integration parameter. For this purpose at the moment of test signal supply to the inlet of the discrete system with rated characteristics, simultaneously discrete integration of control system signals is started with the pitch in seconds for integration parameters in each of the reference points with weights with the pitch in seconds, by supplying of control system signals to the first inlets of the multiplication blocks. Discrete exponential signals are supplied to the second inputs of the multiplication blocks with the pitch in seconds for discrete integration blocks, output signals of the multiplication blocks are supplied to the inputs of the discrete integration blocks with the pitch in seconds. Integration is stopped at the moment of time, estimates of output signals produced as a result of discrete integration are registered. The number of considered single defects of blocks is fixed, integral estimates of model signals are determined for each of the reference points and parameters of discrete integration, produced as a result of test deviations of parameters of each block. For this purpose in turns for each block of the discrete dynamic system they introduce test deviation of the parameter of its discrete transfer function, and integral estimates of output signals of the system are found for parameters of discrete integral conversions and the test signal. Estimates of output signals produced as a result of discrete integration for each of the reference points, every test deviation and every parameter of discrete integration are registered. Deviations of integral estimates of discrete model signals are determined, being produced as a result of test deviations of parameters of appropriate structural blocks, the rated values of deviations of integral estimates of discrete model signals are determined, being produced as a result of test deviations of parameters of appropriate blocks for parameters of discrete integration. The system with rated characteristics is replaced with a controlled one, an identical test signal is supplied to the inlet of the system, integral estimates are determined for signals of the controlled discrete system for reference points and for parameters of the discrete integration. Deviations of integral estimates of controlled discrete system signals are determined for reference points and parameters of discrete integration from rated values. Rated values of deviations of integral estimates of controlled discrete system signals are determined for parameters of discrete integration, diagnostic criteria are determined with parameters of discrete integration, by the minimum value of the diagnostic criterion, a faulty block is determined.
EFFECT: improved noise immunity of the method for diagnostics of discrete systems of automatic control by improvement of defects observability.
The invention relates to the field of control and diagnostics of automatic control systems and their elements.
There is a method of finding a defective block in the dynamic system (Patent for invention №2439648 from 10.01.2012 to application number 2010142159/08(060530), MKI6G05B 23/02, 2012), based on the multiple integration of the output signal of the block with weights
The disadvantage of this method is that it enables the detection of defects only in a continuous dynamic system.
The closest technical solution (prototype) is a way of finding a defective block in the discrete dynamical system (Patent for invention №2444774 from 10.03.2012 on application No. 2011101271/08(001575), MKI6G05B 23/02, 2012).
The disadvantage of this method is that it enables the detection of defects with low visibility, that is, has low noise immunity.
Technical problem on which this invention is directed, is to improve the noise immunity of the method of diagnosis of discrete automatic control systems by improving the distinctiveness of defects. This is achieved by applying many the times of calculation of integral estimates of the dynamic characteristics for several different values of the parameter of integration α 1α2...αn.
This object is achieved in that pre-register response known good discrete-time system fj(t), j=1, 2..., k for N discrete quanta diagnosis t∈[1,N] with discrete constant step Ts to the observation interval [0,Tk] (where Tk=Ts·N) in the k control points, and repeatedly define (simultaneously) integral evaluation of the output signals
replace the system with a nominal characteristics controlled at the input of the system serves a similar test signal x(t), define the integral evaluation of the signals controlled discrete system for the k control points and n parameters of the discrete integration αl:Fj(αl), j=1, ..., k; l=1, ..., n define the deviation of the integral estimates of the signals controlled discrete system for the k control points and n parameters of the discrete integration of the nominal values of ∆ Fj(αl)=Fj(αl)-F
determine diagnostic characteristics for n parameters of the discrete integration of the ratio
the minimum values of the diagnostic characteristic to determine a defective unit.
Thus, the proposed method of finding the defective block is to perform the following operations:
1. As a discrete dynamical system consider the system, for example with discrete zero-order interpolation, with sampling interval Ts, consisting of randomly connected dynamic blocks, number of single defects m blocks.
2. Pre-determine the testing time TTo≥TPPwhere TPPthe time transition of the discrete system. Transition time estimate for the nominal values of the parameters of the dynamic system.
3. Define n parameters that are multiples of 5/Tkmultiple signal integration.
4. Record the number of control points k.
5. Pre-determine the normalized vector
6. Serves the test signal (a single step, linearly increasing, rectangular pulse and so on) to the input of the control system with a nominal characteristics. Fundamental limitations on the type of input test the impact of proposed method does not.
7. Record the response of the system fj(t), j=1, 2, ..., k on the interval t∈[1,N] with a discrete step Ts seconds, the observation interval [0,Tk] (where Tk=Ts·N) in the k control points define discrete integral evaluation of the output signals
8. Define the integral evaluation of the signals of the discrete model for each of the k control points and each of the n values of the discrete integration αlobtained in the course of the trial deviations couples who metres of each of the m blocks,
why alternately for each block in the discrete-time dynamical system is administered trial deviation parameter of the discrete transfer function and perform item 7 for the same test signal. The resulting discrete integration of the evaluation of the output signals for each of the k control points, each of the m test variance and each of the n parameters of the discrete integration
9. Determine the deviation of the integral of the estimated signals of the discrete model, the resulting trial deviations of the respective blocks ΔPji(αl)=Pji(αl)-Fj(αl), j=1, ..., k; i=1, ..., m; l=1, ..., n.
10. Define the normalized Delta values of the integral estimates of signals discrete model, the resulting trial deviations of the respective units according to the formula:
11. Replace the system with a nominal characteristics controlled. At the input of the system serves a similar test signal.
12. Define the integral evaluation of the signals controlled discrete system for the k control points and n parameters integration
13. Determine the deviation of the integral estimates of the signals controlled discrete system for the k control points and n parameters of integration from the nominal values ∆ Fj(αl)=Fj(αl)-Fj(αl), j=1, ..., k; l=1, ..., n.
14. Calculate the normalized values of the variance of the integral estimates of the signals controlled discrete system according to the formula:
15. Calculate the diagnostic signs of a defective block (with n parameters of integration) by the formula (3).
16. The minimum values of the diagnostic sign determine the defective block.
Consider the implementation of the proposed method of finding the defect for discrete-time systems, block diagram of which is presented on the figure (see Fig. Block diagram of the diagnostic object).
Discrete transfer function block:/p>
rated: K1=5; Z1=0.98; K2=0.09516; Q2=0.9048;3=0.0198; Q3=0.9802. When you search for a single structural defect in the form of deviation of the gain by 20% (k1=4) in the first link, when the flow speed of the test input signal of unit amplitude and the integral of the estimated signals for parameters α1=0.5, α2=0.1, α3=2.5 and Tto=10, using three control points located at the outputs of blocks using a trial deviation to a value of 10%, the obtained values of diagnostic signs by the formula (3): J1=0.2511; J2=0.9382; J3=0.5738. Analysis of the values of the diagnostic signs shows what the defect is in the first block of the controlled system is correct. It should be noted that the method is operable at larger values of the test deviations (10-40%). The limitation on the amount of trial deviation is the need to preserve the stability of models with a trial deviations.
Modeling of finding defects in the first block (in the form of reducing the parameter k120%) leads to the calculation of diagnostic features in three dimensions of integration (α1=0.5, α2=0.1 and α3=2.5) according to the formula (3): J1=0, J2=0.8254, J3=0.0898. The appearance of the defect: ΔJ=J3-J1=0.0898.
For comparison, see diagnostic signs of a defective block (in the form of reducing the parameter k120%) with one parameter of integration α=0.5: J1=0; J2=0.7843; J3=0.0717. The appearance of the defect ΔJ=J3-J1=0.0717.
The results show that the actual appearance of finding defects by this method above, therefore, will be higher and the robustness of the method.
Modeling of finding defects in the second and third blocks for the object of diagnosis, with the same parameters α and integration with unit step input signal gives the following values of diagnostic features:
The model is the formation process of finding defects in the second block (in the form of reducing the parameter k 220%) leads to the calculation of diagnostic features in three dimensions of integration (α1=0.5, α2=0.1 and α3=2.5) according to the formula (3): J1=0.8387; J2=0; J3=0.7703. The appearance of the defect: ΔJ=J3-J1=0.7703.
For comparison, see diagnostic signs of a defective block (in the form of reducing the parameter k220%) with one parameter of integration α=0.5: J1=0.7845; J2=0; J3=0.7481. The appearance of the defect ΔJ=J3-J1=0.7481.
Modeling of finding defects in the third block (in the form of reducing the parameter k320%) leads to the calculation of diagnostic features in three dimensions of integration (α1=0.5, α2=0.1 and α3=2.5) according to the formula (3): J1=0.09889; J2=0,7714; J3=0. The appearance of the defect: ΔJ=J3-J1=0.09889.
For comparison, see diagnostic signs of a defective block (in the form of reducing the parameter k320%) with one parameter of integration α=0.5: J1=0.07173; J2=0.7481; J3=0. The appearance of the defect ΔJ=J3-J-=0.07173.
The minimum value of the diagnostic sign in all cases correctly points to the defective block.
Thus, all three defects are better at using the proposed method.
The way of finding a bad block in a discrete dynamicsystems,
based on the fact that record the number m of blocks included in a system, determine the testing time TTo≥TPPdetermine the parameter integral transforms of the signals from the relation
FIELD: electrical engineering.
SUBSTANCE: in the switching device with "-" and "+" feed bars and n of single-type reserved relay cells consisting of four relays and four isolation diodes, the first, second and third switchable "+" feed bars, the fourth switchable "+" feed bar is introduced with four remote switches with two normally closed contacts, five current sensors, controller. The secondary outputs of windings in each cell are connected respectively to the first, second, third and fourth switchable "+" feed bar; the first, second, third and fourth current sensor is installed respectively at first, second, third and fourth switchable "+" feed bar through which the first normally closed contacts of the first, second, third and fourth remote switch is connected with common "+" feed bar while the fifth sensor is installed at switchable "-" feed bar. Outputs of current sensors are connected to data inputs of the controller which signal inputs trough the second normally closed contacts respectively of the first, second, third and fourth remote switch are connected to the common signal input of the controller.
EFFECT: fault monitoring of the relay in a cell in process of manufacturing and operation.
FIELD: process engineering.
SUBSTANCE: method of defining parameter setimate inherent in segment related with engineering process circuit of control over operation of control devices, say, valves. It comprises generating signal data corresponding to signal from engineering process control circuit, storing said data, dividing it into segments of signals, and executing statistic analysis at the first segment of data segments selected from said data segments to generate first estimate of parameters inherent in said segment.
EFFECT: higher accuracy of estimation.
20 cl, 9 dwg
FIELD: electrical engineering.
SUBSTANCE: according to the invention, the control system contains at least one hood drive (actuated by at least one electric motor), electric motor and drive controls, an electric circuit including several electric components, multiple gauges intended for measurement of, respectively, the characteristic value of the electric circuit electric component or group of electric components, fault detectors intended to detect a fault at the electric circuit electric component level when the measured characteristic value pertaining to the component concerned exceeds the preset value of falls within a certain preset range of values.
EFFECT: control system fault robustness enhancement.
9 cl, 3 dwg
FIELD: information technology.
SUBSTANCE: reaction of a good system on an interval at control points is recorded, and integral estimates of output signals of the system are determined, for which at the moment of transmitting a test or operating signal to the input of the system with nominal characteristics, integration of signals of that system is simultaneously started for each control point with a weight function equal to the arithmetic average value of moduli of derivatives of its signals at the control points, where averaging is carried out on the number of control points.
EFFECT: finding one or several faulty units at once in a dynamic system with arbitrary connection thereof, and lower computational costs associated with use of a simpler diagnostic feature.
FIELD: information technology.
SUBSTANCE: reaction of a good system on an interval at control points at discrete time instants to an input stimulus is recorded; output signals of a model are determined for each of the control points, obtained as a result of trial deviations of the examined single and multiple parametric defects of units.
EFFECT: improved noise-immunity of the method of detecting parametric defects in continuous automatic control systems by improving distinguishability of defects and broader functional capabilities of the method of finding one or several deviations at once of transfer function parameters of units of an arbitrary structure in a dynamic system with arbitrary connection of units, and reduced computational costs associated with calculation of the diagnostic feature.
SUBSTANCE: method of detecting malfunctions in bottles in bottle processing machines, wherein a signalling device lies independently from the point where malfunctions occur, preferably in the central part of the bottle processing machine, and the point of the malfunction is optically marked from a distance. The signalling device is optically modulated such that colour and/or image and/or beam direction and/or light pattern of the light source is time and/or spatially modulated.
EFFECT: fast detection and elimination of malfunctions.
17 cl, 1 dwg
FIELD: physics; control.
SUBSTANCE: invention relates to systems, devices and methods for monitoring and transmitting information from a system component sensor located in a high-risk zone. Transmission of information on a system component sensor located in a hazardous zone to a system controller involves use of an improved controller of the hazardous zone along with transmission of data over power lines in order to transmit diagnostic information obtained from the sensor located in the high-risk zone to a central monitor/controller located in a safe zone.
EFFECT: improved transmission of information from sensors lying in a high-risk zone to a central controller lying outside the high-risk zone.
26 cl, 4 dwg
FIELD: information technology.
SUBSTANCE: method involves mathematical planning of an experiment with a set of devices and constructing mathematical models reflecting the effect of input signals and operating action, as well as internal factors (component parameter spread), where said mathematical models are used to form sets of actions and the corresponding allowable deviation of input parameters of the devices (proof tests) in order to check conformity of the manufactured devices with given requirements.
EFFECT: high quality of inspecting manufactured devices.
2 cl, 5 dwg
FIELD: aircraft engineering.
SUBSTANCE: proposed method comprises connecting interface 14 of tester 12 to, at least, one input port of aircraft nose wheel control units 10. Said tester 12 incorporates nose wheel speed simulator to generate speed simulation signal. Nose wheel speed simulation signal is generated to represent definite simulated speed exceeding preset speed. Generated signal is transmitted to unit 10 via interface 14. Tester 12 is used to control simultaneously two separate units 10 to make one of them operate in instruction feed mode and another one in control mode. Output signal of said unit 10 in response to received speed simulation signal is controlled.
EFFECT: higher fault tolerance.
8 cl, 2 dwg
SUBSTANCE: number of dynamic units of a controlled system is determined, reaction of a good system is recorded on an interval at control points, and integral estimates of output signals of the system are determined, for which at the moment of transmitting a test or operating signal to the input of the system with nominal characteristics, integration of signals of that system is simultaneously started for each control point with a weight function equal to the arithmetic average value of moduli of derivatives of its signals at the control points, where averaging is carried out on the number of control points.
EFFECT: broader functional capabilities of the method by applying operating diagnosis, higher noise-immunity of the method of diagnosing continuous automatic control systems by improving distinguishability of defects and lower hardware expenses on calculating the weight function.
FIELD: automatic control, applicable in systems with excessive quality of transducers, for example, accelerometers, a failure of one of which should not result in a failure of the control system.
SUBSTANCE: the method is based on a periodic check-up of relation between the measured parameters of motion characterizing the correct operation of the transducers, fixation of the moment of failure of the relation, comparison of the readings of the transducers at this moment and at the moment preceding the moment of disturbance of the relation, and determination of the failed transducer by the results of the comparison.
EFFECT: expanded functional potentialities due to possibility of determination of the failed transducer in any excess system.
FIELD: measuring and monitoring technique, possibly monitoring of different objects.
SUBSTANCE: system includes control unit, unit for calling testing programs, coupling unit, measuring unit, test stimulation unit, power sources, unit for distributing signals, memory unit, N matching units, N testing program units. Each testing-program unit has evaluation circuit and two memory devices.
EFFECT: lowered volume of equipment, simplified organization of monitoring process and development of software.
FIELD: electric measurements, applicable in check-up of tram and trolleybus electric apparatuses in the process of manufacture and in service.
SUBSTANCE: current in the current source is fed to the current winding of the current relay from the rectifier via a key, choke, shunt. The device uses a pulse-width modulator that controls the keys, slowly varying voltage is applied to the modulating input of the pulse-width modulator that is preliminarily modulated by the rectifier ripple voltage. Besides, use is made of a sample-release circuit of operate (release) currents and voltages. The signals from these circuits are fed to indicators via analog-to-digital converters.
EFFECT: reduced error of determination of operate and release current and voltage relays, enhanced capacity of check-up in the device due to reduced ripples of the source of smoothly varying current.
2 cl, 4 dwg
FIELD: mechanical engineering.
SUBSTANCE: method comprises determining variations of the parameter during acceleration and deceleration of the actuator. The device comprises generator and OR-NOT unit, the inputs of which are connected with the outputs of the relay. The output of the relay is connected with the input of the generator.
EFFECT: enhanced accuracy of the method and simplified device.
FIELD: instrumentation engineering; serviceability check of multichannel communication systems.
SUBSTANCE: proposed equipment includes personal computer, multiplexing switch, circuit checkup unit, control unit, multichannel comparison unit, virtual standard, switching unit, output signal shaper, multiplexer, and normalizing unit that has voltage meter and circuit meter.
EFFECT: enlarged functional capabilities of device.
3 cl, 1 dwg
FIELD: measuring equipment.
SUBSTANCE: as a source of standard signal not separate generator of test signal according to known code structure is used, but a component of modem, to provide for substantial simplification of process under unfavorable conditions.
EFFECT: higher efficiency.
FIELD: automated control and diagnostics systems.
SUBSTANCE: first variant of complex includes control computer, mating block, commutator, local data exchange main, tests forming block, logical analyzer, signature analyzer, synchronization block, digital oscillographs block, special form signals programmed generators block, programmed power-sources block. Second variant of complex additionally includes block for forming high-frequency test signals and block for measuring high-frequency signals.
EFFECT: broader functional capabilities, higher efficiency, higher reliability.
2 cl, 2 dwg
FIELD: automatic control.
SUBSTANCE: device has first and second analog-digital converters, first and second coefficients forming blocks, first and second multiplication blocks, counter, first and second integrator, control effect forming device, division block, buffer and registering block, while coefficients forming blocks are made in form of digital filters and all remaining blocks of device are made digital.
EFFECT: higher precision, higher resistance to interference.
FIELD: measuring equipment.
SUBSTANCE: device has block for forming control and stimulation signals, block for forming standard signals, multiplication blocks, frequency transformer, phase rotator, commutator, frequencies grid generator, integrators, blocks for square involution, adder, normalization block, key, analog-digital converter, comparison circuits, memory blocks, registers, information output block, interval estimation block (for setting lower and upper limits of trust range for each measured value of mutual difference coefficient of distorted and standard signals) and block for analysis of number of support values of mutual difference coefficient (to exclude from further processing results of measurements, for which within limits of trust interval number of support values of coefficient exceeds allowed limit).
EFFECT: higher precision.
2 cl, 2 dwg
FIELD: technical diagnostics.
SUBSTANCE: method includes, for each set of input test signals, forming of prior matching response signals for intermediate points of controlled device. Received response signals at outputs of product are compared to parameters of standard response signals and level of their match is determined, in case of mismatches broken branch of functional circuit is determined and diagnostics is repeated by substituting all formed combinations of input signals, after that diagnostics of erratic portions is started.
EFFECT: simplified method.