The machine tool is tangential the design of controller of feed speed faintness

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Summary: According to the real need that some machine tool works, be based on faintness to control a principle, designed this machine tool tangential the ambiguous controller of feed speed, use MATLAB to emulated software to undertake emulation an analysis to its. The analysis makes clear as a result: Ambiguous control makes quantity of the system exceeding tone and stable state error are reduced somewhat, raised a system to dog the ability of speed signal, assured tangential the stability of feed speed. Ambiguous control is a kind of control that is based on regulation, it adopts language control regulation directly, its basis is the controls experience or relevant expert knowledge of field work personnel, in the accurate maths model that does not need to establish target be accusinged in the design, make consequently control mechanism and strategy are accepted easily with understanding, the design is simple, facilitating application. Some machine tool is in cut exercise process, in make sure tensile force is steady while, still should make tangential feed speed is maintained constant, because it is the cutting parameter with work efficiency of this machine tool and bigger impact of cutting tool service life, and efficiency and life are a pair of contradiction normally, existing in actual cutting process so an optimal value, in assure efficiency while the economy that cutting tool of give attention to two or morethings uses. The article is right of this machine tangential the ambiguous control method of feed speed undertakes designing an analysis. 1 tangential sheet of double input of structure of controller of feed speed faintness outputs ambiguous controller is the ambiguous controller that is used extensively at present, it is to have two inputs variable and the controller with a variable output. The change of the deviation E between the real value that motor of driving pulley hydraulic pressure chooses to output rotate speed in the design and set-point and its deviation leads C to regard an input as language variable, the main factor influence output rotate speed, discharge of exit of servo a powerful person regards output as language variable, formed sheet of a double input to output ambiguous controller so. Some machine tool is tangential the ambiguous controller structure of feed speed, of the metabolic ratio C that K1 and K2 are the deviation E that outputs rotate speed and deviation respectively quantify scale factor, k3 is those who control an amount to quantify scale factor. Take E of variable of two inputs language, C of variable of output of 2 controller input and ambiguous subclass certainly quantify grade to be 7 class, namely E, c={-3, - 2, - 1, 0, 1, 2, 3} , make output a language quantify grade to be 9 class, namely U={-4, - 3, - 2, - 1, 0, 1, 2, 3, 4} . Of deviation E it is by region [- 15, 15] , of deviation change C it is by region [- 1, 1] , control those who output Vj to be by region [- 30, 30] , then each quantify factor to be: K1=3=1K2=3=31551 scale factor is K3=30=7.

Decide E of variable of each language stage, C and U are in in 54 designs quantify by the ambiguous subclass inside region number all is 7, namely {NB, NM, NS, o, PS, PM, PB} . Those who express 1 faintness to control regulation to express NBNMNSOPSPMPBNBPBPBPBPMPMOONMPBPBPMPMPSONSNSPBPMPMPSONSNMOPMPSPSONSNSNMPSPMPSONSNMNMNBPMPSONSNMNMNBNBPBOONMNMNBNBNB to express E/C of 2 ambiguous variable is subject spend assignment to express - 3-2-10+1+2+3PB000000.

51PM00000.

510.

5PS0000.

510.

50O000.

510.

500NS00.

510.

5000NM0.

510.

50000NB10.

500000 those who express 3 ambiguous and variable U is subject spend assignment to express - 4-3-2-10+1+2+3+4PB00000000.

51PM000000.

5110.

5PS00000.

510.

500O0000.

510.

5000NS000.

510.

50000NM0.

5110.

500000NB10.

500000003 building faintness to control regular faintness to control regulation is a lot of faintness that the control that operates personnel experience has summing up and reach essentially the gather of conditional statement. The principle that decides faintness controls regulation is the movement condition that the output that must assure controller can make systematic output is answered character is achieved optimal. Choosing control to measure metabolic principle is: When the error big bigger perhaps when, the choice controls a quantity to be given priority to with eliminating an error as soon as possible; And when the error is minor, the choice controls a quantity to want to notice to prevent to exceed tone, it is main jumping-off place with systematic stability. If the list of ambiguous control regulation that builds according to this regulation expresses 1 to show. The assignment with 4 affirmatory variable faintness expresses ambiguous variable C of change of deviation E, deviation and the ambiguous market that its dominate quantity U and after deciding by region, need is affirmatory to vague language variable subject spend function, assign to ambiguous variable namely, be opposite by the element inside region certainly of vague language variable subject degree. The ambiguous subclass that chooses ambiguous and variable E and C is subject the figure that spends function is a triangle, the ambiguous subclass of ambiguous and variable U is subject the mixture that spends function to be triangle and echelon. Watch 2 show with 3 those who be 3 ambiguous variable is subject spend assignment watch, they are according to this the machine tool works actually circumstance and specific and affirmatory. The 5 output that build ambiguous control to express ambiguous controller are an obscure part, it contains all sorts of information of control quantity, but object be accusinged can accept an exact control amount only, this undertakes blurring adjudicative with respect to need (ambiguous and decision-making) , measure ambiguous quantity translate into accurately, so that produce the decision-making result of ambiguous inference result better. The process that measures ambiguous quantity translate into accurately calls clarity to change, say to go again modular gelatinization (Defuzzification) , or weigh ambiguous court decision. The commonly used ambiguous court decision in automata has 3 kinds of methods normally: The biggest subject degree of law, take median law and way of centre of gravity. Because law of centre of gravity has more flowing output inference control, namely the correspondence little change at inputting signal, the final output of its inference also can produce constant change commonly, and this kind of change is compared apparently the biggest subject spend function law to want flowing, what because this article establishs ambiguous control,express place to use is law of centre of gravity. Law of centre of gravity is to point to take faintness subject the centre of gravity that spends function curve and abscissa to be surrounded into the area is ambiguous inference to export a worth finally. To having M the disperse that sendout changes grade to count considers region case, accurate sendout is: I=1 of Σ of I=1mµu(ui) of Σ of U0=mµu(ui) · Ui expresses 4 faintness to dominate a list - sampling and computation gain 3-2-10+1+2+3-34332210-2333210-1-132210-1-202210-1-2-3+1210-1-2-3-3+210-1-2-3-3-3+30-1-2-2-3-3-4 ground torsion deviation E and C of its change law, use on the exact value that type can seek an output to control an amount. Ambiguous control watch sees a table 4. Be being built as a result of what ambiguous control expresses undertake from the line, so its a bit won't affect the rate that ambiguous controller runs in real time. Once faintness controls a watch to be built, algorithm of pilot of ambiguous and logistic inference is simple checking expresses a law, its traversal speed is quite fast, pilot of the real time in complete quite can contented real work asks. After 6 faintness control system simulation faintness to control a watch to build, the special software tool of the process designing of knot composition of a picture that we used company of American MathWorks software to be MATLAB design technically to offer and system simulation -- SIMUlink emulation software built structure of control system simulation to if pursue,pursue show 2 times, the signal that emulation system inputs is a model rank jump signal and brae signal, sampling cycle takes Ts=0.

001s. Reach through analysing computation the open loop transfer function that controls a system is: G(s)=2.

03s2+0.

48s+12212221 underwater diamond the rope curiums machine is tangential feed speed faintness controls a system rank jump answer, systematic brae is answered. Can see, use ambiguous controller pilot tangential feed speed, will make quantity of the system exceeding tone and stable state error are reduced somewhat, raised a system to dog the ability of speed signal. 7 conclusion can see through emulating an analysis, be in tangential after feed adds ambiguous controller in control system, when will making this machine tool can produce change in cutting condition, adjust in time tangential feed speed, made maintenance is constant value, assure to curium cut operation successful ' efficient ' reliable ground undertakes. CNC Milling