《机械-工程测试技术基础》熊诗波课后习题答案.pdf
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1、 机械工程测试技术基础-第三版-熊诗波等著绪论0-1 叙述我国法定计量单位的基本内容。解答:教材P45,二、法定计量单位。0-2 如何保证量值的准确和一致?解答:(参考教材P46,二、法定计量单位五、量值的传递和计量器具检定)1、对计量单位做出严格的定义;2、有保存、复现和传递单位的一整套制度和设备;3、必须保存有基准计量器具,包括国家基准、副基准、工作基准等。3、必须按检定规程对计量器具实施检定或校准,将国家级准所复现的计量单位量值经过各级计算标准传递到工作计量器具。0-3 何谓测量误差?通常测量误差是如何分类表示的?解答:(教材 P810,八、测量误差)0-4 请将下列诸测量结果中的绝对误
2、差改写为相对误差。1.0182544V 7.8 V(25.048940.00003)g(5.482 0.026)g/cm2解答:-667.810/1.01825447.6601682/1060.00003/25.048941.197655/100.026/5.4824.7430-5 何 谓 测 量不 确 定度?国 际计 量 局于1980 年 提 出的 建 议 实验 不确 定 度的 规 定建 议书INC-1(1980)的要点是什么?解答:(1)测量不确定度是表征被测量值的真值在所处量值范围的一个估计,亦即由于测量误差的存在而对被测量值不能肯定的程度。(2)要点:见教材P11。0-6 为什么选用电
3、表时,不但要考虑它的准确度,而且要考虑它的量程?为什么是用电表时应尽可能地在电表量程上限的三分之二以上使用?用量程为150V 的 0.5 级电压表和量程为30V 的 1.5 级电压表分别测量 25V 电压,请问哪一个测量准确度高?解答:(1)因为多数的电工仪表、热工仪表和部分无线电测量仪器是按引用误差分级的(例如,精度等级为0.2 级的电表,其引用误差为0.2%),而引用误差=绝对误差/引用值其中的引用值一般是仪表的满度值(或量程),所以用电表测量的结果的绝对误差大小与量程有关。量程越大,引起的绝对误差越大,所以在选用电表时,不但要考虑它的准确度,而且要考虑它的量程。(2)从(1)中可知,电表
4、测量所带来的绝对误差=精度等级 量程/100,即电表所带来的绝对误差是一定的,这样,当被测量值越大,测量结果的相对误差就越小,测量准确度就越高,所以用电表时应尽可能地在电表量程上限的三分之二以上使用。(3)150V 的 0.5 级电压表所带来的绝对误差=0.5 150/100=0.75V;30V 的 1.5 级电压表所带来的绝对误差=1.5 30/100=0.45V。所以 30V 的 1.5 级电压表测量精度高。0-7 如何表达测量结果?对某量进行8 次测量,测得值分别为:802.40,802.50,802.38,802.48,802.42,802.46,802.45,802.43。求其测量结
5、果。解答:(1)测量结果=样本平均值 不确定度或?xsXxxn(2)81802.448iixx821()0.0403568 1iixxs?0.0142688xs所以测量结果=802.44+0.014268 0-8 用米尺逐段丈量一段10m 的距离,设丈量1m 距离的标准差为0.2mm。如何表示此项间接测量的函数式?求测此10m 距离的标准差。解答:(1)101iiLL(2)210210.6mmiLLiiLL0-9 直圆柱体的直径及高的相对标准差均为0.5%,求其体积的相对标准差为多少?解答:设直径的平均值为d,高的平均值为h,体积的平均值为V,则24 d hV2222222222222242V
6、dhdhdhVV dh ddhVVdh所以222244(0.5%)(0.5%)1.1%VdhVdh文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U
7、9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW
8、4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U
9、9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW
10、4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U
11、9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW
12、4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6文档编码:CP3Q8U9W4L4 HT7C6X8Q9A8 ZW4V4A6T7K6第一章信号的分类与描述1-1 求周期方波(见图1-4)的傅里叶级数(复指数函数形式),划出|cn|和 n 图,并与表1-1对比。解答:在一个周期的表达式为00 (0)2()(0)2TAtx tTAt积分区间取(-T/2,T/2)00000000220200021
13、11()d=d+d=(cos-1)(=0,1,2,3,)TTjntjntjntTTncx t etAetAetTTTAjnnn所以复指数函数形式的傅里叶级数为001()(1cos)jntjntnnnAx tc ejnen,=0,1,2,3,n。(1 cos)(=0,1,2,3,)0nInRAcnnnc2221,3,(1 cos)00,2,4,6,nnRnIA nAcccnnn n1,3,5,2arctan1,3,5,200,2,4,6,nInnRncncn没有偶次谐波。其频谱图如下图所示。图 1-4 周期方波信号波形图0 t x(t)T02T020TA-A T0文档编码:CR7F9G9I2R1
14、 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10
15、 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文
16、档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2
17、R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N
18、10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C
19、3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9
20、I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C31-2 求正弦信号0()sinx tx t的绝对均值x和均方根值rmsx。解答:00002200000224211()dsindsindcosTTTTxxxxxx ttx ttt t tTTTTT222200rms0000111 cos2()dsindd22TTTxx txx ttx t ttT
21、TT1-3 求指数函数()(0,0)atx tAeat的频谱。解答:(2)220220(2)()()(2)2(2)ajf tjf tatjf teAA ajfX fx t edtAeedtAajfajfaf22()(2)kX fafIm()2()arctanarctanRe()XfffXfa1-4 求符号函数(见图 1-25a)和单位阶跃函数(见图 1-25b)的频谱。|cn|n /2-/2 00305030502A/2A/32A/5幅频图相频图周期方波复指数函数形式频谱图2A/52A/32A/-0-30-50-0-30-50单边指数衰减信号频谱图f|X(f)|A/a0 (f)f 0 /2-/
22、2 文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G
23、9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1
24、Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4
25、Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F9G9I2R1 HH9C3C1Q3N10 ZX9J4A4Q4C3文档编码:CR7F
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