Faintness controls the application in system of synchro control of 10 thousand tons of hydraulic press

1mm/m, namely random two complementary crock is on horizontal distance apart 1 when, the position error between them cannot exceed 0.

1mm. Graph sketch map of 1 hydraulic press 2, the system is designed 2.

1 systems analysis is in fluid drive system, synchro control demand is very global, but large flow, high accuracy, much carry out implement synchronous, it is all the time relatively scabrous difficult problem. Because the liquid of hydraulic pressure system is compressed, the characteristic such as leak, damp, especially outer hold power bigger force carries to change ceaselessly outside mixing those who reach equipment itself is lopsided below as bigger as equipment campaign travel factor, realize the synchronous precision with taller crock of many hydraulic pressure to have very great difficulty, the research of the respect such as because this is right method of the design program of synchronism system, control, synchronous function, can matter to the runs condition actually to whether can achieve a design truly requirement of hydraulic press finally. Ask in this system crock of 5 hydraulic pressure spends synchronism in athletic middling speed not only, and positional synchronism also has very high demand, and the discharge span when the system moves with low speed in high speed is bigger (the flow when low speed is spent is little, big) of the discharge when high speed is spent, so this system is one changes the synchro control system of discharge, high accuracy. According to hydraulic pressure principle knowable, electro-hydraulic a powerful person of control system cent accuses system and pump to control a system two kinds. Because a powerful person accuses a system to have control precision to be mixed high,respond the good point with sharp speed, because of this requirement to can achieve a design, this system uses a powerful person to charge means of hydraulic pressure crock, namely the scale servo a powerful person that crock of each hydraulic pressure employs a high accuracy will dominate the synchronous result with getting high accuracy. The system controls in a powerful person in, the transfer function that core of a powerful person inputs output of piston of crock of the hydraulic pressure that it is Xv to be Y can write for: In type, for hydraulic pressure natural frequency; Compare for hydraulic pressure damp; K δ E is total discharge pressure coefficient. Make clear from this, when stable state Xv of displacement of core of a powerful person and piston displacement do not have affirmatory corresponding relation, but hydraulic pressure crock has affirmatory stable state concern between velocity of piston and displacement of core of a powerful person, following type place show: This shows, be in theoretic the displacement of core of a powerful person that should have dominated each a powerful person or family only, achieve the goal that synchronism of crock of 5 hydraulic pressure runs likely. Because this system is,actually one changes the synchro control system of discharge, high accuracy, its control is had nonlinear, when metamorphic characteristic, its many parameter are had nonlinear characteristic, and follow operating mode and change, and, as a result of 5 crocks of mutual influences in moving, want to build model of accurate maths of 5 crocks of synchronous processes to have very great difficulty, special those who point out is to as a result of,be in in moving process advocate the crock is located in position of slide block center, the actual place that runs to its cannot detect, and advocate the main pressure when the crock produces the job again, if be in working process,control to its undeserved, the certain crock in can causing complementary crock can follow therewith action only, and make the adjustment of itself of this complementary crock motive be no longer in force, cause whole and synchronous failure, because this is right advocate the performance that the control stand or fall that the crock runs can affect whole system directly. Because be in effective system, detect of high accuracy on 4 complementary crocks device (the grating feet) that precision is 1 micron, can detect in real time slide block quadrilateral the speed of be issued to lower levels and displacement, control precision to assure consequently, 4 complementary crocks use PID to control and advocate the control of the crock should get the influence of 4 complementary crocks, namely advocate the control decision that the control of the crock wants to make his from inside the moving circumstance of 4 complementary crocks, accordingly advocate the control of the crock uses faintness to control a technology. 2.

2 advocate faintness of displacement of core of a powerful person of a powerful person of crock scale servo controls design faintness is in order to blur the computer intelligence control that variable of set theory, vague language and inference of ambiguous manage collect are a foundation, its are basic the concept is by Cha De (L.

A.

Zadeh) puts forward above all, through old development, in ambiguous control respect of theory and applied research all gains very great success [because 3] is ambiguous the advantage of controller is the accurate maths model that does not ask to master controlled object, change when the big lag that comes up against to be in industrial control process so, nonlinear wait for the complex system that cannot build accurate maths model the method that ambiguous control is a kind of effective undoubtedly. Because ambiguous controller is the core of ambiguous control system, a faintness controls function actor bad of the system, depend on inference of the structure of ambiguous controller, adopts ambiguous regulation, synthesis is algorithmic, and the element such as ambiguous and decision-making method. Accordingly, what the variable in ambiguous to this hydraulic press system considers region is affirmatory, subject spend function choose and the alternative that sees ambiguous method leaves to get through experimenting for many times in spot circumstance. According to synchronous design index asks the biggest error (0.

Mix under 4mm the spot is real the biggest error (5mm the following) , choose region of theory of error to be [0 5] , output is by region [0 10] , input error A0 is complementary crock 3 crock of opposite Yu Fu the position error of 1 (diagonal) , input error B0 is complementary crock 2 crock of opposite Yu Fu the position error of 1, input error C0 is complementary crock 4 crock of opposite Yu Fu the position error of 1, sendout is controlled to output D0 advocate the displacement of core of a powerful person of a powerful person of crock scale servo. There should be to be more than in 3 errors be equal to 0.

When 4mm, advocate the displacement of core of a powerful person of a powerful person of crock scale servo wants small, be worth when 3 errors hour, advocate the displacement of core of a powerful person of a powerful person of crock scale servo wants big. The actual condition of be issued to lower levels of the slide block when working according to hydraulic press establishs following regulation: D Is of output of big Then of C Is of error of input of big And of B Is of error of input of big And of A Is of If input error is small; D Is of output of the Then in C Is of error of input of big And of B Is of error of input of big And of A Is of If input error is small; D Is of output of small Then of C Is of error of input of big And of B Is of error of input of big And of A Is of If input error is small; D Is of output of the Then in C Is of error of input of the And in B Is of error of input of big And of A Is of If input error is lesser; In D Is of output of small Then of C Is of error of input of the And in B Is of error of input of the And in A Is of If input error; D Is of output of small Then of C Is of error of input of small And of B Is of error of input of the And in A Is of If input error is bigger; D Is of output of big Then of C Is of error of input of big And of B Is of error of input of the And in A Is of If input error is small; D Is of output of small Then of C Is of error of input of small And of B Is of error of input of small And of A Is of If input error is big; In D Is of output of the Then in C Is of error of input of the And in B Is of error of input of small And of A Is of If input error; D Is of output of big Then of C Is of error of input of big And of B Is of error of input of small And of A Is of If input error is small. 3, experimental test and verify 3.

1 sky carries place of experimental graph 2a to show for hydraulic press 4 complementary crocks use PID control, advocate the crock uses faintness to control technical circumstance to fall, hydraulic press slide block carries the curve of synchronous the biggest error when be issued to lower levels in low speed sky, x-axis is axis of the biggest error, unit: Mm; Cross axle is axis of real time time, show for present actual time. From the real time that the computer prints curve of the biggest error looks, when the biggest error makes an appointment with 5mm, controller begins to undertake adjustment to 5 crocks of synchronism, after 2min much bell, synchronous the biggest error is close to Yu Ling, although be in,a few wave motion appear in adjusting a process, time has a little some long, but total trend and settling time and the analysis that spend empty running to low speed agree basically, final synchronous result satisfies a requirement completely. 3.

Place of 2b of graph of 2 laden experiments shows what record when actual suppress workpiece for hydraulic press the biggest error real time curve. In process of hydraulic press suppress, if shut synchro control function temporarily, see by the graph, as the elapse of time, synchronous the biggest error will increase gradually, this kind of error will affect the figuration quality with final work badly, at the same time the service life of the whole system to hydraulic press also is met with use safety constitute menace, when the biggest simultaneous error is close to 4mm, put through synchro control function, the biggest simultaneous error is reduced quickly, be close to Yu Ling very quickly, this shows, when hydraulic press is taking laden job, synchronous time is compared when carrying for nothing short, the design of this and system of whole hydraulic press is concerned. As a result of hydraulic press the largest space between two complementary crocks is 4m much, design index according to hydraulic press knowable, be less than when the biggest simultaneous error 0.

The requirement can be satisfied when 4mm, but the synchronous precision of hydraulic press is far actually good at this index, because hydraulic press position detects,those who use is the grating feet that precision is 1Lm, consequently we can undertake the curve that is close to position of Yu Ling coordinate coordinate alternates junior travel observes, if graph 2c place is shown, drop when the biggest simultaneous error it is thus clear that 0.

4mm hind still continues to drop, be in till basic finally stability 0.

03mm left and right sides, it is namely when 4m of apart of position of two crocks of levels, the biggest simultaneous error is in maintain control in 30 micron. Graph 2 experiments curve 4, the last word looks from afore-mentioned experimental results, to this hydraulic press advocate after a powerful person of crock scale servo uses faintness to control a technology, make the synchronous effect of system of whole synchro control complete achieved design requirement, at present this hydraulic press is in our country some is large aviation forgings base investment moves more than two years to come function stability, result is favorable. CNC Milling