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1、qdh5VL!9张义民黄贤振张旭方吕春梅东北大学, 沈阳,110004K1:将可靠性理论与优化技术相结合,讨论了不完全概率信息牛头刨床机构运动精度的可靠性优化设计问题,提出了可靠性优化设计的数值计算方法。在已知基本随机参数前四阶矩的情况下,通过计算机程序实现了牛头刨床机构的运动精度可靠性优化设计,迅速准确地得到牛头刨床机构的设计信息。1oM:dh5;VL;!9;qms|:TH112.1cI|:1004132X(2008)19235504Optimization Design for Kinematic Accuracy Reliability of Shaping Mechanismunder
2、IncompleteProbability InformationZhang YiminHuang XianzhenZhang XufangLChunmeiNortheastern University, Shenyang, 110004Abstract:The optimization design for kinematic accuracy reliability of shaping mechanism underincomplete probability information is extensively discussed in this paper by combining
3、the reliabilitytheory and optimization technology, and a numerical method for reliability-based optimization designis proposed.Under the condition that the first four moments of basic random parameters are availa-ble, computer programs based on this model can complete the reliability-based optimizat
4、ion designfor kinematic accuracy of shaping mechanism, and acquire the design information accurately andquickly.Key words:shaping mechanism;reliability;optimal design;incomplete probability informationl:20070713:SE1S(50535010);SE863/?Z9(2007AA04Z442)0引言s!9(8)NXEs,O|T1,2 。.ds!9V,Y。7CL,y+Ms#/、yY,;N,sy
5、Y,s9VE 3-9 。y+VY,yNs!9HAsIntyY。-,s!9X。D10, 11S=,sY)W#Y;D12-14L!9M!9sqVB+s-4/,yVLs;D15-17VL!9;D18, 19!9Fr1p。s,48q+,#L!,s/,#Y。8Inq/F,Edgeworth)ZE#MTZE,dh,)qf/VL!95,?Zs!9。1 平面连杆机构的运动精度模型!、1V/BFZ:F(U,V,L)=0 (1)T,F= f 1 f 2 f n T;Un_,U = u1 u2 un T ;Vm_,V= v1 v2 vm T ;Lsq_,L= l1 l2 lsT 。2355qdh5VL!9fl:fZ
6、YVT(1)V、1/:U =U(V,L) (2)Es20 ,HYt|T(1)M()BTaylorZ7:FUTU+FVTV+FLTL=0 (3)T, F/ UT、 F/ VT F/ LTV1,M()|。(3)TVU=- F UT-1( F VTV+ F LTL) (4)7A=- F UT-1 F VT F LTX=v1v2vml1l2ls TT,A;X_X_,X= v1 v2 vm l1 l2 ls T 。5U=AX (5)2 牛头刨床机构运动精度可靠性模型m1Udh5vF。TH,.,wc1B,YVvAP2O2P,iYVvBTL,LCCTbV,V7MdT。m1dh5m1Udh5,_:U =xC2
7、lO2 AT ,:V =1,(!9)_:L =l1 l2l3l4T 。m5,IHZ_,OO97dh,Vy1(:F=xC-l2cos2l1cos1 -lO2 A cos2l1sin1 +l3 -lO2 A sin2(6)(Vp1V1,7VpU =xC2 lO2 AT 。dh5F,APxCS=。-xC (7)T,。yN,VL5ss),/K-xCVLR LKxC VLRU ,5VLR =RL +RU -1 (8)eV,)KxC HVL5,MZEVp/K-xCVL。sxCVLVlR =g(,r)0f(Z)dZ (9),f(Z)(=)r(r =xC)qf,g(,r)f,VVU:g(,r)0g(,r)0(10)T,g(,r)=0KZ,VK,9。fl,KfVVUg(,r)=-r (11)VrMM。f-VVUg =E g(,r) =-r2g =Var g(,r) =2+2rg =E g(,r)-g(,r)3 =-rg =E g(,r)-g(,r) 4 =+r +622r(12)VLSl=gg= E g(X)Var g(X)(13)_XVsH,VVLB9:R =() (14)T,()Ssf。Edgeworth)ZE 21 ,VV
