Multi-channel loading system
FIELD: experimental equipment, possible use in stands for testing mechanical properties of structures.
SUBSTANCE: multi-channel loading system contains a controlling computer, hydro-power source and tracking loading channels with check force connection. Loading channel includes digital controller, hydro-cylinder and dynamometer with inbuilt normalizing amplifier, servo-valve, mounted on it. Loading channel additionally contains generator of load-setting signals, while generator and regulator are mounted on hydro-cylinder and connected to controlling computer by field bus interface.
EFFECT: increased reliability and increased manufacturability of a multichannel system.
The invention relates to means experiment and is intended to automate the process of loading of the structures during strength testing.
Known digital control system test facility containing a digital computing device, digital-analog converters, vibrators, mechanically connected to a test object, the feedback sensors and analog-to-digital converters.
A disadvantage of the known systems is the difficulty with a large number of control channels (see Hetmans A.G. and other Automatic control of vibration tests. M: Energy, 1978, p.78).
Closest to the invention is a multi-channel system loading, containing measuring and computing complex (CPI), the channel loading and the source hydrophonia (see Manual of specialized measuring and computing complex "Arrow", registered in the State. The registry 24192-02 from 15.01.2003, certificate RVC 34.082.A No. 13948/1 and A.S. CCCP No. 920638, CL G05B 19/18, 1982).
In the system each channel loading is a servo hydraulic actuator with force feedback and contains a hydraulic cylinder, a servo valve, the dynamometer with normalizing amplifier. Channel control loading is carried out using the CPI containing control computer and computer lower the level, communicating between a device input / output. In the lower level computer programmed General on the group of channels of the signal generator of job stress and digital regulators all channels. The output of each regulator is set to analog Converter (DAC), an analog signal which goes to the servo valve of the corresponding channel loading. To the regulator each channel loading with dynamometer this channel for use as feedback comes in the analog signal. This signal is amplified normalizing amplifier through an analog-to-digital Converter (ADC) is fed to the controller.
The disadvantages of the known system load is above the analog connection, significantly complicating the installation and maintenance of the system and reduces its reliability.
The objective of the invention is to improve the reliability and manufacturability of the multichannel system loading by improving its structure and application of modern devices transmit information.
The solution of the problem and the technical result is achieved by the fact that in a multi-channel system loading that contains the control computer, the source hydrophane and witness channels loading with force feedback, each of which includes a signal generator of job stress, regulator, cylinder, and the mouth is fixed on it dynamometer with built-normalizing amplifier, and the servo valve, each channel loading contains a digital signal generator of job stress and the controller is microprocessor-based, installed on the cylinder, and connected to the control computer of the field bus interface.
Figure 1 shows the block diagram of the multichannel system loading.
Figure 2 - the specific location of the digital controller, servo valve and the digital signal generator of job stress on the cylinder.
Channel loading N1includes cylinder 1, reproducing the load on the structure, the dynamometer 2 with built-normalizing amplifier 3, the digital controller 4, the servo valve 5, the digital sine wave signal generator of the job stress 6. Field bus interface 7, the computer 8 and the source hydrophane 9 are common to the channels in the loading of the N1...Nn. The cylinder is loaded with design connected through the dynamometer. The servo valve 5 is installed on the cylinder 1 and the hose connected to the cavities, as well as source hydrophane 9. The electrical input of the servo valve 5 is connected to the digital controller 4, which is electrically connected to the normalizing amplifier 3 dynamometer 2 and the digital signal generator of job stress 6. The digital signal generator of job stress 6 and the controller 4 via the field bus interface 7 with the IDE with the computer 8.
The digital signal generator of job stress and the control channel loading is installed on the cylinder. Digital controller 4, the servo valve 5, the hydraulic cylinder 1 and the dynamometer 2 form a closed loop servo channel loading within the dimensions of the cylinder.
Multi-channel system loading works as follows. From the computer 8 on all digital signal generators of job stress 6 in advance on the field bus interface 7 consistently do the job (the value of the next load level and time of access). On the Start signal all digital signal generators of job stress at the same time begin to play a sinusoidal reference signals received at the inputs of digital controllers 4. For each digital controller also receives a feedback signal from the dynamometer 2 through normalizing amplifier 3, which is algebraically summed with the reference signal. The difference of these signals (the error signal) is supplied to the control servo valve 5, performing throttle control cylinder 1, load the design. Hydrophilinae all servo-valves 5 comes from a source of hydrophane 9. On command from the computer 8, the digital signal generator of job stress 6 can stabilize the reference signal at any level and continue to build the W on the new command from the computer. Setting the digital controllers is performed by commands from the computer 8.
Information about the work of the channels loading N1...Nnenters the computer 8 field bus interface 7.
By installing a signal generator of job stress on the cylinder substantially decreases the flow of information from the control computer to the TV loading that allows you to connect their field bus interface that simplifies cable installation multichannel system loading, and subsequent maintenance.
Thus, thanks to the digital signal generator of job stress in conjunction with a digital regulator on the cylinder is simplified connection of a computer to channels loading, fixed long (up to hundreds of meters) analog communications controller - servo valve and the dynamometer controller, characteristic of the known multi-channel systems of loading, which increases the noise immunity and accordingly, the reliability of the multi-channel system loading.
Multi-channel system loading for structural testing of structures containing computer source hydrophane, tracking channels loading with force feedback, each of which includes a signal generator of job stress, regulator, cylinder and installed it dynamometer with built-normalizing amplifier, and is also the servo valve, when the servo valve is connected by a hose with the cavities of the cylinder and a source of hydrophane, and the electrical input of the servo valve connected to the controller, which is electrically connected to the normalizing amplifier dynamometer, characterized in that each channel loading digital signal generator of job stress and the controller is microprocessor-based, installed on the cylinder, and with control Board digital signal generator of job stress and a controller connected to the field bus interface.
FIELD: processes for controlling metal cutting machine tools, namely number program control machine tools.
SUBSTANCE: method comprises steps of forming control signals, feeding them to step motors of machine tool. In order to enhance automation degree and quality of worked parts, control signals are generated on base of data of interaction between two-dimensional images of objects taking part in cutting process and formed on screen of computer monitor when contour of blank image is changed for imparting to it shape of ready part.
EFFECT: enhanced automation degree, improved quality of parts.
FIELD: automatics and computer engineering, possible use for engineering distributed systems for program control of technological processes, robots and robot complexes, and also systems for logical control of multilevel logical automatic control systems and broad range of multi-processor systems.
SUBSTANCE: due to regularity of inter-module connections, addition of new column or row of modules does not require insertion of new physical connections. Possibility of such buildup males it possible for network to adapt quickly for realization of more complicated control algorithms. Microcontroller network contains M*N modules of the same type, connected as matrix structure, where N - number of modules in a row of matrix structure of network, M - number of rows, while each module includes program memory block, address register, command register, logical conditions multiplexer, address commutator, synchronization block, elements OR from first to third, compliance vector register, buffer register, first and second decoders of synchronization vertex number, OR elements block, first and second univibrators, delay element, a group of blocks for controlling synchronization is inserted, while each block for controlling synchronization includes trigger of presence of neighbor on the left, trigger of presence of neighbor below, a group of NOT elements, a group of AND elements, OR elements from first to fifth, first and second AND elements, commutator, trigger and launch permission trigger.
EFFECT: expanded range of possible implementation of microcontroller network due to possible simple adding of modules to it.
2 cl, 8 dwg
FIELD: engineering of generic controlling and adjusting systems, possible use in systems for controlling compressor plants.
SUBSTANCE: controlling block has microcontroller, analog inputs expansion board, modular measuring transformer, galvanic decoupling board, control and protection board, distributing board, discontinuous output modules, module of discontinuous input ˜220, module of discontinuous output ˜220, indication board, operation time counter, keyboard, fan, secondary electric power module, power block. Control block realizes manual and automatic control modes for compressor plant.
EFFECT: expanded functional capabilities, increased reliability, improved cost characteristics.
7 dwg, 2 tbl
FIELD: engineering of automated systems for controlling technological processes, possible use for controlling preparation of multi-component slag-forming compositions at metallurgic industrial plants.
SUBSTANCE: automatic system for controlling preparation process of slag-forming compositions has visualization level, including serially connected tasks block, technological interface block and block for storing process data and level of controlling subsystem, including input signals block, diagnostics block, signaling and control block, inter-level data exchange block, block for controlling screw feeder of batcher, block for controlling mixer, block of output signals. Into level of controlling subsystem a technological process coordinator block is inserted, and into visualization level block for storing and receiving chemical analysis of mixture samples and source components is inserted, as well as block for computing main batching recipe and block for computing corrections batching recipe.
EFFECT: increased efficiency of control over preparation of slag-forming compositions having given chemical composition by increasing precision of dosage of source components of composition due to automatic control over main operations of technological process.
FIELD: water provision control.
SUBSTANCE: result is achieved due to optimal distribution of load between pumping stations during whole working time ad minimizing excessive forces in water grid.
EFFECT: higher efficiency, higher reliability.
5 cl, 1 dwg
FIELD: blast furnaces.
SUBSTANCE: device has control subsystem level, and visualization level. Control subsystem level has system diagnostics block, technological process coordination block and inter-level exchange block.
EFFECT: broader functional capabilities.
FIELD: computer science.
SUBSTANCE: device additionally includes first and second block for address selection of minimal continual value, block for permission of program transfer receiving, first and second demultiplexer blocks, fatal breakdown detector block, support voltages forming block, first, second, third and fourth range selection blocks, vitality signals separation block, block for determining minimal continual value and block for forming vitality signals.
EFFECT: broader functional capabilities.
20 dwg, 1 tbl
FIELD: process control in machining parts for mechanical engineering, food industry, agriculture, and other industries.
SUBSTANCE: proposed method involves measurement of most descriptive process parameter in the course of operation of process system. Measurement results are converted by means of computer into amplitude-frequency spectrum wherefrom oscillation decrements at inherent frequencies of system are evaluated. Decrement values obtained are compared with critical value of 0.05 - 0.10. If they are below specified value, system load is reduced and if they are above it, load is increased.
EFFECT: optimized process, enhanced process capacity within permissible load conditions.
1 cl, 1 ex
FIELD: technology for studying frictional properties of metallic covers by means of electrochemical solution of micro-section of surface of sample to estimate linear wear.
SUBSTANCE: method for estimating wear of metallic covers is realized by means of determining thickness of cover before and after wear by means of electrochemical solution of micro-sections of surface of researched and standard samples. Electrochemical solution of micro-section of cover surface is performed so that electrochemical probe is lowered onto surface of sample, electrochemical process is performed, recording full perforation time, being linear function of thickness of cover, and then standard sample is dissolved up to full removal of cover material, recording time of perforation, while in both cases perforation time is used to compute cover thickness, while sample being researched represents cover after wear, while wear is less than thickness of cover, and standard sample represents non-worn cover of similar composition.
EFFECT: expanded functional capabilities, increased precision, information capacity and productiveness of analysis.
FIELD: test equipment.
SUBSTANCE: installation has bunker, mixer, chamber, sample's holder. To give oscillation motion to sample as in vertical and in horizontal planes, vibration exciter is used. Design of sample's holder allows making extending or pressing deformations of samples.
EFFECT: widened functional abilities; improved truth of tests.
FIELD: testing technology.
SUBSTANCE: proposed device has bearing plate, loading member, power source and programmer. Power source feeding the working fluid to loading member is made in form of pipe line mounted vertically for control of required height. Device is provided with level sensors, electrically controlled distributors which are connected with programmer and adjustable throttle valves fitted in working fluid delivery and return lines, as well as with tray for receiving the working fluid leakage in case of overload of members under test; this tray is connected with service tank through return line. Working fluid is fed to power source either by low-pressure pumping unit or by gravity from reservoir located above power source; said reservoir is connected to centralized power source through electrically controlled distributor and is provided with high and low level sensors; return line is connected with centralized power source.
EFFECT: enhanced accuracy of loading; enhanced reliability of protection of object under test.
FIELD: the invention refers to testing technique and may be used for evaluation of technical state of construction structures namely of the resource of an automobile bridge.
SUBSTANCE: the evaluation of the residual resource of an automobile bridge is carried out along the parameters of experimental amplitude-frequency characteristics under the influence of loading, the measurements are carried out in two stages with intervals between them of no less then 0,05 of the projected resource of the bridge. At that the current values of speed or accelerations in extreme angular dots of the upper plate of a girth rail of the bridge under the influence of a moving pack of transport vehicles out of no less then 5 automobiles each weights 19-20t, with an interval of 10-30m, with the speed of 40, 50, 60 km/h The number integration is carried out. The wave-length transformation is carried out, spectrograms of displacements on all regimes of moving of the pack are received. The speed of changing of the zone of maximal amplitudes are defined for an interval of time Δt between controlling tests and the residual resource T.
EFFECT: decreases labor-intensiveness and increases accuracy of definition of the resource of construction structures.