工程测试技术基础-张春华-课后答案[1-5章]

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1、-667.810/1.01825447.6601682/1060.00003/25.048941.197655/100.026/5.4824.743sXxxxn8xii1x802.44882()xxii1s0.04035681s0.014268x810LLii1210L20.6mmLLii1LidhV2dhV422222VV22dh22dVdhdhdh242222dh2VVdh22Vdh2244(0.5%)(0.5%)1.1%Vdhx(t)AT0T0220tT0T0-A1-4T0At(0)2xt()T0At(0)2TT001jnt110jntjntc22x(t)e0d=tAe00d+t

2、AetdnT0T0T02TT0020000A=j(cosnn-1)(=0,1,2,3,)nx(t)cejnt00jA1(1cos)nejntn=0,1,2,3,nnnnAcn(1cos)nIn(n=0,1,2,3,)c0nR2AAn1,3,,22ccc(1cos)nnnnRnIn0n0,2,4,6,n1,3,5,2cnIarctann1,3,5,nc2nR0n0,2,4,6,

3、cn

4、n2A/2A//2030502A/32A/32A/52A/5-50-30-0-/2-50-30-003050x(tx)sintx0xrmsTT11TT2x24xxx202000x(t)dtxsinttdsi

5、nttdcost2x00T0T00TTT21T21TT22x001cos2tx00xx(t)dtxsindtttdrms0T0TT0022atx(t)Ae(at0,0)(aj2)ftj22ftatjfteAAAAa(j2)fX(f)x()tedtAeedtA0220(aj2f)aj2faf(2)kXf()22af(2)ImX(ff)2(f)arctanarctanReX()fa

6、X(f)

7、(f)A/a/20f0-/2fsgn(t)u(t)110t0t-1a)b)1-251-410tx(tt)sgn()10tatatet0x(t)etsgn()1atet0x(t)sgn(t)limxt(

8、)1a0j2ft0atj22ftatjft4fX(f)x()tedteedteedtj11220af(2)1X(f)Fsgn(t)limX()fj1a0f1Xf()ff02()ff02x1(t)1

9、X(f)

10、(f)/20t0f-/20f-1atx(t)etsgn()110tut()00t11ut()sgn()t221111111U(f)Fu(t)FFsgn(t)(f)j()fj22222ff112U(ff)()22f

11、U(f)

12、(f)/20f(1/2)-/20ft10tut()()d00tt1111Uf()F()d(f)(0)(f)()fjj2ff22cost0costtT0x(t)x

13、t()0tT1x(t)w(t)cos(2)ft0-T0TtW(f)2Tsinc(2)Tfcos(2)ft1eej22f00tjft-102w(t)x(t)11w(t)ej22ft00w()tejft12211X(f)W(ff)W()ff2200-T0TtTsinc[2T(ff00)]Tsinc[2T(ff)]1-26X(f)T-f0f0fatx(te)sint0x(t)1jtjtsin()tee0002jat1j00tjtx()teee2jatx(t)e(at0,0)1jtatjt1ajX(f)x()tedteedt11220aja11aj()aj()00X()XX()()101022

14、222j2jaa()()00222[aa()]2000j22222222[a()][a()][aa()][()]0000X()()0-0cost()cost00m0ft()cost00mf(t)F()0t-m0m1-271-7x(t)f(tt)cos()0F()F[ft()]1jtjtcos()tee000211jtjtx(t)f(t)e00f()te2211X(f)FF()()0022X(f)-00f0m2x(tx)sin()t0xx11TT02limx(t)dtxsin(t)d0tTx00TTT0002221TT210022x00T1cos2()txlimx(t)dtxsin(t)

15、dttdx0TT0TT002200Tttt2x012TT2txx0P[xx()txx]limTTTT00P[xx()txx]2tt2d1px()limlimxx0x0TxTxdx22x000x(t)ttx+xxt11Hs()H()s11j11AH()()1()2221()TA1100%58.6%T1s32.7%T2s8.5%T5s11H()A()()arctan(0.005)1j0.0051(0.005)21yAx(10)0.50.499010