CN105716887B - A kind of hydraulic static load test control method - Google Patents
A kind of hydraulic static load test control method Download PDFInfo
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- CN105716887B CN105716887B CN201410736965.7A CN201410736965A CN105716887B CN 105716887 B CN105716887 B CN 105716887B CN 201410736965 A CN201410736965 A CN 201410736965A CN 105716887 B CN105716887 B CN 105716887B
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Abstract
The technology belongs to control method field, and in particular to a kind of hydraulic static load test control method.A kind of hydraulic static load test control method is provided, during static loading test, the manually and automatically switching of corresponding control mode can be carried out as the case may be；The handover security that power control and position are controlled between two kinds of control modes is reliable, it is easy to accomplish；The shock response of hydraulic cylinder, improves working efficiency when different control modes switching processed.
Description
Technical field
The technology belongs to control method field, and in particular to a kind of hydraulic static load test control method.
Background technology
Finite element analysis is experimentally intensity under dead weight of observation and research structure or component, just
Degree, stability and stress, a practical engineering section for deforming distribution situation.It is for determining structural member in certain load
Stress distribution, bearing capacity and stability under lotus effect, to examine whether structural member meets design requirement, while can be right
Current proof theory analysis and numerical computations are tested, and the reliability of computation model is improved, or propose new theory and
Computational methods.Static loading test is all widely used in numerous areas such as national defense and military, aerospaces, in large-sized structural parts
Development and design during and it is formal be delivered for use before, slow test will be carried out.
Before static loading test (power control) starts, from the point of view of facilitating test operator, displacement is used first
The installation of testpieces is realized in control, and gives test specimen to load a upper small value force in advance, it is made to meet power control condition, then manually or certainly
It is dynamic to be switched to power prosecutor formula, it is brought when test specimen not only being installed to test operator conveniently, but also play a protective role to test specimen.And
And in testing loading procedure, test specimen is likely to occur abnormal conditions (unknown abnormal sound such as occur, breaking property destroys), needs at this time
Test specimen, stopping is protected to continue to power load, be switched to displacement-control mode in time, make hydraulic cylinder stop motion.
The purpose of pattern switching is the experiment application met under different operating modes in static loading test.Designing control system needs
The critical issue to be solved is：Which kind of strategy to realize that hydraulic cylinder switches without impact using, with the safety of protection test part.Tradition
Mode handoff techniques, be all to control same physical quantitiess under different control modes or control parameter, so the principle of pattern switching
All it is the effect of being fade-in fade-out for pursuing its controlled quentity controlled variable, ensures the steady no impact of executing agency.But involved in static loading
Pattern switching not only has the variation of control parameter, the also variation of control feedback physical quantity, institute compared with traditional pattern switching
Not to be suitable for the test requirements document of static loading pattern switching using the pattern switching principle being fade-in fade-out.
Invention content
It is an object of the invention to：A kind of hydraulic static load test control method is provided, realizes the switching of control mode,
And ensure hydraulic cylinder switching instant without impact, guarantee test part safety.
Technical scheme is as follows：A kind of hydraulic static load test control method, includes the following steps：
Step 1：Whether just to detect oil pump, hydraulic cylinder, hydraulic efficiency servo-valve and hydraulic pressure auxiliary element and measuring and controlling instrument device
Often, it is ensured that control mode is Bit andits control；
Step 2：Start oil supply pressure, sets Bit andits control instruction to the value of feedback of current displacement, pass through closed-loop control
Ensure that hydraulic cylinder is motionless in original position；
Step 3：Hydraulic cylinder is controlled using displacement-control mode, until force snesor has signal output, can be constituted
When feedback force closed-loop control, it is switched to power prosecutor formula, switchover policy is force feedback signal of the power control instruction equal to switching instant, is led to
The error of exertin calculates controlled quentity controlled variable u power (t) with power control parameter and exports to hydraulic efficiency servo-valve, to maintain force feedback when switching
Be worth it is constant, to make hydraulic cylinder not generate impact；
Step 4：After being switched to power prosecutor formula, then multistage loadings should be carried out by the power control load spectrum pre-set, by
Force snesor has had a small force value when being switched to power control, loads time spectrum when starting loading force control, control strategy is first to press
It is transitioned into load first load(ing) point of spectrum according to the ramp signal set, is then followed by and is loaded according to power control load spectrum.
Further include step 5 after the step 4：In testing loading procedure, if test specimen is abnormal situation, stop
Power load is continued to, displacement-control mode is switched to, makes hydraulic cylinder stop motion, switchover policy is equal to for displacement control instruction to be cut
The Displacement Feedback signal for changing the moment is calculated controlled quentity controlled variable u (t) by displacement error and position control parameter and exports to servo
Valve, Displacement Feedback value when maintaining to switch is constant, and hydraulic cylinder is avoided to impact.
Further include step 6 after the step 5：If the abnormal conditions described in step 5 are not caused by test specimen itself
, then it switches back into power control according to step 4 and continues to load；If confirming, test specimen itself is abnormal, can control liquid according to displacement-control mode
Cylinder pressure returns to home, closes oil supply pressure.
It is switched to power prosecutor formula and meets condition automatic switchover including manual or setting.
It is switched to power prosecutor formula and meets condition automatic switchover including manual or setting.
The abnormal conditions include unknown abnormal sound, breaking property destruction occur.
The remarkable result of the present invention is：During static loading test, can accordingly it be controlled as the case may be
The manually and automatically switching of mode；The handover security that power control and position are controlled between two kinds of control modes is reliable, it is easy to accomplish；System is different
The shock response of hydraulic cylinder when control mode switching, guarantee test part safety, improves working efficiency.
Specific implementation mode
A kind of hydraulic static load test control method of the present invention, includes the following steps：
Step 1：Whether normal detect oil circuit, circuit, it is ensured that control mode is Bit andits control；
Step 2：Start oil supply pressure, sets Bit andits control instruction to the value of feedback of current displacement, pass through closed-loop control
Ensure that hydraulic cylinder is motionless in original position；
Step 3：Hydraulic cylinder is controlled using displacement-control mode, until force snesor has signal output, can be constituted
When feedback force closed-loop control, it is switched to power prosecutor formula (including manual or setting meets condition automatic switchover), switchover policy is
Power control instruction calculates controlled quentity controlled variable u power (t) and defeated equal to the force feedback signal of switching instant by error and the power control parameter of power
Go out to hydraulic efficiency servo-valve, to make hydraulic cylinder not generate impact；
Step 4：After being switched to power prosecutor formula, then multistage loadings should be carried out by the power control load spectrum pre-set, by
Force snesor has had a small force value when being switched to power control, loads time spectrum when starting loading force control, control strategy is first to press
It is transitioned into load first load(ing) point of spectrum according to the ramp signal set, is then followed by and is loaded according to power control load spectrum.
Step 5：In testing loading procedure, if test specimen is abnormal situation and (unknown abnormal sound such as occurs, breaking property destroys
Deng), then stop continuing to power load, is switched to displacement-control mode (including manually or setting meets condition and cuts automatically
Change), it is the Displacement Feedback signal that displacement control instruction is equal to switching instant to make hydraulic cylinder stop motion, switchover policy, passes through displacement
Controlled quentity controlled variable u is calculated with position control parameter in errorPosition(t) it and exports to hydraulic efficiency servo-valve, to maintain Displacement Feedback value when switching
It is constant, avoid hydraulic cylinder from impacting；
Step 6：If the abnormal conditions described in step 5 are not caused by test specimen itself, switched back into according to step 4
Power control continues to load；If confirming, test specimen itself is abnormal, can control hydraulic cylinder according to displacement-control mode and return to home, close
Oil supply pressure.
Claims (6)
1. a kind of hydraulic static load test control method, it is characterised in that：Include the following steps：
Step 1：It detects oil pump, hydraulic cylinder, hydraulic efficiency servo-valve and hydraulic pressure auxiliary element and whether measuring and controlling instrument device is normal, really
Guarantor's control mode is Bit andits control；
Step 2：Start oil supply pressure, sets Bit andits control instruction to the value of feedback of current displacement, ensured by closed-loop control
Hydraulic cylinder is motionless in original position；
Step 3：Hydraulic cylinder is controlled using displacement-control mode, until force snesor has signal output, feedback can be constituted
When power closed-loop control, it is switched to power prosecutor formula, switchover policy is the force feedback signal that power control instruction is equal to switching instant, passes through power
Error and power control parameter calculate controlled quentity controlled variable uPower(t) it and exports to hydraulic efficiency servo-valve, force feedback value when maintaining to switch is not
Become, to make hydraulic cylinder not generate impact；
Step 4：After being switched to power prosecutor formula, then should by pre-set power control load spectrum carry out step by step, load, due to
Force snesor has had a small force value when being switched to power control, when start loading force control load time spectrum, control strategy be first according to
The ramp signal set is transitioned into power control load first load(ing) point of spectrum, is then followed by and is loaded according to power control load spectrum.
2. a kind of hydraulic static load test control method according to claim 1, it is characterised in that：The step 4 it
After further include step 5：In testing loading procedure, if test specimen is abnormal situation, stopping continues to power load, switches
To displacement-control mode, it is that displacement control instruction is believed equal to the Displacement Feedback of switching instant to make hydraulic cylinder stop motion, switchover policy
Number, parameter is controlled by displacement error and position, controlled quentity controlled variable u is calculatedPosition(t) it and exports to hydraulic efficiency servo-valve, when maintaining to switch
Displacement Feedback value is constant, and hydraulic cylinder is avoided to impact.
3. a kind of hydraulic static load test control method according to claim 2, it is characterised in that：The step 5 it
After further include step 6：If the abnormal conditions described in step 5 are not caused by test specimen itself, switched back into according to step 4
Power control continues to load；If confirming, test specimen itself is abnormal, can control hydraulic cylinder according to displacement-control mode and return to home, close
Oil supply pressure.
4. a kind of hydraulic static load test control method according to claim 1, it is characterised in that：It is switched to power prosecutor
Formula includes manually or setting meets condition automatic switchover.
5. a kind of hydraulic static load test control method according to claim 2, it is characterised in that：It is switched to power prosecutor
Formula includes manually or setting meets condition automatic switchover.
6. a kind of hydraulic static load test control method according to claim 2, it is characterised in that：The abnormal conditions
Including there is unknown abnormal sound, breaking property destroys.
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| CN201410736965.7A CN105716887B (en) | 2014-12-05 | 2014-12-05 | A kind of hydraulic static load test control method |
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| CN201410736965.7A CN105716887B (en) | 2014-12-05 | 2014-12-05 | A kind of hydraulic static load test control method |
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| CN105716887B true CN105716887B (en) | 2018-08-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106989941A (en) | 2017-03-30 | 2017-07-28 | 中车青岛四方车辆研究所有限公司 | Car lifting J-Horner lift unit load test TT＆C system and method |
| CN109372826B (en) * | 2018-12-13 | 2020-03-24 | 中国工程物理研究院化工材料研究所 | Linear continuous static force loading control method |
| CN109596437B (en) * | 2019-01-14 | 2021-04-02 | 中国工程物理研究院化工材料研究所 | Design method of loading force control system of static force accurate loading simulation device |
| CN109596436B (en) * | 2019-01-14 | 2021-04-06 | 中国工程物理研究院化工材料研究所 | Static force accurate driving method of large-tonnage safety static force accurate loading simulation device |
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| CN101101247A (en) * | 2007-01-25 | 2008-01-09 | 北京交通大学 | Digital type self-adaptive electro-hydraulic fatigue test machine and realization method |
| US8429907B2 (en) * | 2009-07-01 | 2013-04-30 | Hamilton Sundstrand Corporation | Active hydraulic regeneration for motion control |
| CN102141484B (en) * | 2010-12-29 | 2014-04-30 | 天津大学 | Multi-functional portable electric servo control loading device and loading method thereof |
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