机械控制工程基础课后答案-董玉红、徐莉萍主编

....?r_。具体地谢谢阅读感谢阅读;谢谢阅读:(谢谢阅读感谢阅读感谢阅读谢谢阅读?谢谢阅读精品文档放心下载内在反谢谢阅读专业word可编辑....?精品文档放心下载。为了提高控制系统的精度，增谢谢阅读精品文档放心下载?:;;精品文档放心下载?精品文档放心下载谢谢阅读精品文档放心下载专业word可编辑....设回流电流为i由电压定律有：ui同时：u(t)01(t)(t)1(t)Cu0(t)u0uu(t)0CRi(t)1(t)u(t)0i0(t)1(t)u(t)0

i0解：d(x(t)ix对x)FB0对)F'Kxx(t)00d(x(t)xBKxi00(t)0))(t)K(t)0x(t)B0i设RCu(t)1RC由电压定律有：u(t)u(t)u(t)感谢阅读iRC0u(t)(t)又R及电容并联的电流为iCRCRC1RRC1iu(t)0R2R2u(t)u(t)(t)CRC0RCRR21u(t)u(t)u(t)d(u(t)u))

C感谢阅读000

iiRR21(t)11(t)1C()u(t)Ciu(t)精品文档放心下载0R0RRi121专业word可编辑....解：d(x(t)ix))k(x(t)对x)左端：F0Bx01i对)右端：F'Kx(t)x020d(x(t)x))))x(t)k(x(t)B0K20xi01i(t)(t)(t)B0k)x(t)Bikx1201i0(t))iu(t)Riui101(t)同时：u(t)Ri02Cu(t)u(t)由（）ii0R1u(t)u(t)1u(t)u(t)

u(t)R谢谢阅读dtii00RCR0211(t)Rdu(t)(t)1

()(u(t)u))020感谢阅读iRC

R0

i11R(t)R(t)R(t)1感谢阅读)(u(t)20202

iRRRCRi1111(t)(t)(t)(RRRC0RCiu(t)精品文档放心下载01212i专业word可编辑....f.解：设kx2k2对x)Fk(x(t)x))精品文档放心下载010

id(x(t)x))对x)F'B0k2

0Bd(x))k(x(t)x))

(t)0xk210id(x(t)))对左端：F0xk2k2B对k右端：F'kx(t)22k2d(x(t)x))Bkx(t)(2)0k22k2(2)有：k(t)x))x(t)10(xk2ki2代入（）(t)(t)(x(t)xB0Bk2i))k01(t)kd(x(t)x))B0B1k(x(t)x))精品文档放心下载i0k10

i2(t)kdx)k(t)BB1kxB1ik(t)感谢阅读x00k1k01

i22(t)(t)(kk)Bkx(t)Bkik(t)谢谢阅读kkx012120112i1111(s)L(f))-ssTs1s1T专业word可编辑....(2)f(t)0.030.03cos2t精品文档放心下载1ss24-s20.12F(s)L(f(t))0.030.030.03谢谢阅读ss22s(s2）s(s2）谢谢阅读2f(t))5t)3F(s)L(f(t))55tes15ss22(4)cos12t及复位移0.4s0.4F(s)L(f(t))（s0.4）2专业word可编辑....2.5(t)x(t)x12)

(t)K(t)x(t)

x(t)mxxBx'1313232(t)mxxBx"(t)K(t)x(t)x'(t)K2213232

2两边进行拉氏变换：ms2X(s)(s)k(s)XkBsXX312(s)k(s)131Xms2X(s)kBsXX122213ms2X(s)k(s)BsX(s)kXX1313312kX(s)BsX(s)KX(s)ms2X133212(s)BsX3(s)BsX(s)2(s)-K(s)(s)KX21X22X(s)2（）232(s)BsX(s)）2(s)BsX(s)K(s)kX22221由（）(ms2Bs(s)k)X

X3(s)11Bsk21代入（）(ms2BsKk)(ms2Bs

k)X(s)kX感谢阅读(s)BsX(s)KX(s)221113Bsk13321

1(ms2BsKk)(ms2Bsk)X(s)精品文档放心下载-kBs）X(s)KX(s)221113谢谢阅读Bsk13211X(s)K32X(s)(ms2BsKk)(ms2Bsk)精品文档放心下载-kBs）122111Bsk11K(Bsk)21(ms2BsKk)(ms2Bsk)-kBs(Bsk)谢谢阅读22111111精品文档放心下载精品文档放心下载xot,t0(t)1eT专业word可编辑....3.4典型二阶系统G(s)2ns2s22

nn感谢阅读c(t)1et12dt),t0arctg12arccosdn12专业word可编辑....2x)o10tp5t1t)enn1c(t)11e(21)1e1)2221)tn(2t1)，t0n专业word可编辑....(s)1/(s111/(ss2谢谢阅读(j)1

j2）124(）-22、当r(t)sin时(j)218(j2)t(1g22)c(t)0.35sin(2t）专业word可编辑....开环频率特性：2(jj212142-tanarctan121.510.5sixAyranigamI0-1-1012图1专业word可编辑....闭环传递函数为：(s)G(s)1G(s)0.05s30.15s2

s(j)j)30.15(j)2(j)2)j(3))2)2(

3)2令)d率1,代入)得rMr1.838?精