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测控技术与仪器专业英语教程(第2版)课后答案


第一章 1.简谐信号是最简单和最重要的周期信号。任意一个周期信号可以用简谐信号来表达,两者 之间联系的桥梁是傅里叶级数,所以傅里叶级数是周期信号分析的理论基础。 翻译:Harmonic signal is the simplest and the most important periodic signal. Any one of the periodic signal can

use harmonic signal to express, contact between the bridge is Fourier series, so Fourier series is periodic signal analysis of the theoretical basis. 2.一个在时域上显得很复杂的信号,将其变换或映射到频域(包括 s 和 z 域) ,就能够分解 为非常简单的基本信号形式,进行分析和求解。 翻译:A time domain appear very complex signal, its transformation or mapping to the frequency domain (including s and z domain), can be decomposed to A very simple basic signal form, carries on the analysis and solution. 第二章 1.信号不是周期性出现,而只是持续一段时间,不再重复出现,如过渡过程、爆炸产生的冲 击波、 起落架着陆时的信号等, 把这一类信号看成为非周期信号。 分析非周期信号的思路是: 在时域上,当周期 A,周期信号变成为非周期信号:在频域上,周期信号的频谱在 A 时的 极限,变为非周期信号的频谱,即傅里叶变换。 翻译:Signals are not periodic appear, but only for a period of time, and shall not repeat appear, such as the transition process from an explosion, the shock wave, landing gear landing signal, this kind of signal see as a periodic signal. Analysis of the thinking of the periodic signal in time domain, when A cycle, cycle signal into non periodic signal: in the frequency domain, the signal spectrum in A cycle of limit, A non periodic signal spectrum, namely Fourier transform. 2.信号在时域压缩α 倍(α >0)时,则在频域中频带加宽,幅值压缩 1/α 倍;反之信号在时 域扩展时(α <1) ,在频域中将引起频带变窄,但幅值增高。 翻译:Signal in time domain compression α times (α > 0), the band in frequency domain widened, amplitude compression 1 / α times; And signal in time domain extension (α < 1), in the frequency domain will cause narrow band, but increased amplitude. 第四章 1.随机信号是不能用精确的数学关系式描述的信号,但它的变动服从统计规律,可以用概率 统计特性来描述。对随机信号按时间历程所做的各次长时间观测记录称为样本函数。 翻译:Random signal is not a precise mathematical relation description of the signal, but it changes to obey statistical rule, can use probability statistics characteristic to describe. To random signal according to the time course of the long time observation record called sample function. 2.随机信号的时域和频域特性可以用统计方法进行研究,其幅值特性用信号的均值、均方值 和概率密度函数表示。 信号的时域特性也可以用自相关函数描述, 频域特性用功率谱密度函 数描述。 翻译: Random signal of time domain and frequency domain properties can use statistical methods, the characteristics of the signal amplitude with the mean and the mean square value and probability density function said. The signal characteristics in time domain, also can use the autocorrelation function description, the frequency domain characteristics with power spectral density function description. 第五章 1.当被测量不随时间变化或变化缓慢时,输出 y 与 x 之间的关系成为静态特性;当被测量随 时间迅速变化时,输出 y 与 x 之间的关系称为动态特性。 翻译:When measuring don't change over time or changes slowly, output y and the relationship

between the x as static characteristic; When measuring over time and rapid change, the output y and the relationship between the x is called dynamic characteristics 第六章 1.输出信号稳态值与响应曲线在垂直方向的差值为系统的动态误差。它与时间 t 有关,当 t 时,动态误差趋于零。显然,在相同时刻,输出与输入之间的差异也越小,所以应尽可能采 用时间常数τ 值小的测试系统。 翻译: Signal output steady-state value and response curve in the vertical direction of the difference for the system dynamic error. It and time t relevant, when t, the dynamic error tends to zero. Obviously, at the same time, the difference between the input and output and the small, so should as far as possible the time constant τ value small test system. 2.实际的测量系统往往难以做到完全符合不失真测试条件, 被测信号也不可能包含所有的频 率分量。根据测试精度的要求,只要被测信号的率带宽度处于测试的带宽。 翻译:The actual measurement system is often difficult to do fully comply with no distortion test conditions, the measured signal can't contain all of the frequency component. According to the test accuracy requirements, as long as the measured signal rate band width in the bandwidth of the test. 第七章 1.电阻应变式测力传感器是目前使用最广泛的一种测力传感器。它不仅灵敏度高,而且可用 于测量力的瞬时值, 另外, 还可以应用合理应变片的位置及接桥方式消除切削分力的相互干 扰,从而使其结构简化。 翻译:Resistance strain type force transducer is currently the most widely used a force transducer. It not only high sensitivity, and can be used for measuring force instantaneous value, in addition, also can be used reasonable strain gauge position and the bridge cutting force way to eliminate the mutual interference, so that the structure simplification. 2.半导体应变片的突出优点是:灵敏度高,可测微小应变。其不足之处是:电阻温度系数大, 对环境温度的变化敏感;测量大应变时灵敏度的非线性严重。 翻译:Semiconductor strain gauge outstanding advantage is: high sensitivity, measurable small strain. The deficiency is: temperature coefficient of resistance to the environment, the change of the temperature sensitive; When measuring large strain sensitivity of nonlinear serious. 第八章 1.电感式传感器的应用十分广泛,凡是与位移有关的物理量都可通过它转换成电量输出。常 用来测量振动、厚度、应变、压力、加速度等各种物理量。 翻译:Inductive sensor used widely, all and displacement related physical quantities can be converted into electricity output through it. Commonly used to measure vibration, thickness, strain, stress, acceleration, etc. Various kinds of physical quantity. 2.根据电容式传感器的原理,利用极间距和极板遮盖面积的变化,可以测量直线位移或角位 移。通过弹性膜片可以测量压力,通过弹性梁可测量振动和加速度等。 翻译:According to the principle of the capacitive sensor, using pole spacing and plate cover area change, can measure linear displacement or angular displacement. Through the elastic diaphragm can measure pressure, through the elastic beam can be used to measure the vibration and acceleration, etc.


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