例123:铣削凸台轮廓 N10G54G90G00Z200: N20T01M06 N40S1200M03 N50Z5M08 N60G42X0Y0 N70G01Z-5F50

例88:G81指令编程实例 %0088 N10 G92 XO Z100 N15M6T101 N2091g00S300M03m07 N30g99g81-10.0Z-22.0r-98.0f150 N40Y30.0 N50X10.0y-10.0

12.1 The Nature of Autocorrelation 1. Definition (1) CLRM assumption: No autocorrelation exist in dishurbances ui; E(iμi)=0 Autocorrelation means: E(μiμ)≠0 (2) Autocorrelation is usually associated with time series data, but it can also occur in cross-sectional data, which is called spatial correlation

台并直流电动机,-220V,=15k n1000r/min,定液率几=85%,电回路总电阻(包括 电刷接触电阻R0.2,励磁回路总电阻R=110 将电机接在L=220V的直流中网上,并用原动机拖动使 其作发电机运行:(1)当保持发电机电电流为电动机 额定工况下的枢电流时,求发电机的转速、电磁转矩、 输出的电功率;(2)当该电机作发电机运行但其输出电 功率为0时,求发电机的转速(不计电枢反应的影响)

1.无空化区:大于初生空化数此时水轮机的能量特性不发生变化。 2.空化发展区:0<0后,水中空泡增多,空化现象也从周期性不稳定出现变得经常出现,继续减小,开始出现过流壁面的空烛破坏,但对水轮机的能量特性效尚无明显影响

例46:小手柄的数控车床加工 0004 N10G50X100Z100; (对刀点,也是换刀点) N20T0101M03S600F0.2M08:(F0.2是每转进给量)

Lecture D32: Damped Free Vibration Spring-Dashpot-Mass System k Spring Force Fs =-kx, k>0 Dashpot Fd =-cx, c>0 Newton's Second Law (mx =EF) mx +cx+kx (Define)Natural Frequency wn=k/m,and

Lecture D33: Forced Vibration Fosinwt m Spring Force Fs =-kx, k>0 Dashpot Fd =-ci, c>0 Forcing Fext Fo sin wt Newton's Second Law (mix =CF) mx+cx+kx= Fo sin wt =k/m,=c/(2mwn)

1.试计算下属序列的DFT(a)(13,17,19,23)(b)(2,1,3,7,5,4,0,6) 2.试计算下述序列的逆DFT(a)(16,-0.76+8.66i,-6+6i,-9.25+2.66i0,-9.25-

第二章非线性方程求根 l* Solutions of Nonlinear Equations* 求f(x)=0的根 1多项式基础* Polynomials*(自习) 2二分法l* Bisection Method*1 原理:若f∈C[a,b,且f(a)f(b)<0,则f在(a,b)上必有一根