推导了固定四角薄型平板扬声器在单点激励下的振动方程，分析了在受激情况下的简正频率，并由简正频率方程导出其受力方程。
The vibration equation for thin flat plane loudspeaker with single point drive and four corners fixed is deduced and its simple harmonic vibration frequency in this condition is analyzed.
理论推导和实例结果表明，随机振动的声学响应特性取决于声学频率响应函数和激励谱密度函数。
The results show that acoustic response feature of random vibration depends on the acoustic response function and the spectral density function of the stimulating load.
对五柱塞泵机组的振动激励源进行了分析研究，并对主要激励源振动频率进行了分析、计算；
This paper describes the basic characteristics of the various exciting sources of the pumping set, and analyses and calculates the vibration frequencies of the sources.
典型尺度的雷暴低空风切变以长周期振动频率激励飞机，使其偏离预计下滑航迹。
A typical low-level wind shear of thunderstorm activates long periodic oscillation of an aircraft, causing tracking deviation of the aircraft.
本文为实际工程应用课题，重点在于研究桅杆振动固有频率的边界条件分析和在风激励下的涡激振动响应的计算研究。
This research subject is done for engineering application, mainly about boundary condition analysis of mode calculation and analysis of vortex-excited response for barrel-shaped mast.
结果表明，当外加激励的频率等于转子的固有频率时，将诱发转子产生大幅的轴向挠性振动。
The results show that the violent flexible vibration will happen if the motivation frequency equals to the natural frequency of the rotor.
试验研究了激励频率、比例阀输入电压及磁流变减振器输入电流对座椅振动特性的影响规律。
The effects of actuating frequency, proportional valve input voltage and MR damper input current on the vibration characteristics of seat were experimentally studied.
根据复合材料超声直线电机振动体具有两个固有频率的特点，设计了一种能综合调整激励信号幅值及频率的超声直线电机驱动源。
Based on the microcosmic elastic mechanics, a PWM driver of ultrasonic linear motor is proposed in this paper, whose frequencies and amplitudes could be adjusted synthetically.
推导出了描述油管柱振动规律的波动方程、固有频率方程、油管柱振动位移方程等数学模型。研究了引起油管柱产生共振的激励频率与油管柱固有频率的关系等。
From which the mathematical models like wave equation, natural frequency equation and tubing string vibration displacement equation used to describe the tubing string vibration laws have been educed.
实验结果表明：施加电场后的电流变液夹层圆柱壳体对处于中、高频率的声波没有明显的吸收和阻隔效果，但对于由声激励引起的结构振动有明显的控制作用。
The test results show that by adjusting applied electrical field strength, the properties of the ER material as well as the sandwich cylindrical shell can be changed.
再用振动信号记录系统记录此时实验激励的振动加速度的均方根值。将记录的数据利用最小二乘和优化设计的方法拟合成振动频率计权曲线。
The data were fitted to the same form of the frequency weighting Wk of ISO 2631-1 with the least square method and optimization of parameters.
再用振动信号记录系统记录此时实验激励的振动加速度的均方根值。将记录的数据利用最小二乘和优化设计的方法拟合成振动频率计权曲线。
The data were fitted to the same form of the frequency weighting Wk of ISO 2631-1 with the least square method and optimization of parameters.
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