固有频率 natural frequency基音频率 fundamental frequency泛音 overtones 答案 物体作自由振动时,其位移随时间按正弦规律变化,又称为简谐振动.简谐振动的振幅及初相位与振动的初始条件有关,振动的周期或频率与初始条件无关,而与系统的固有特性有关,称为固有频率或者固有周期Fundamental tone)一般的声音都是由发音体发出...
aat the equipment fundamental natural frequency, it will generally be possible to add a low amplitude sine beat signal to the time history at the equipment fundamental frequency to raise the test response spectrum above the RRS. 以设备根本固有频率,增加一个低高度正弦敲打信号到时间历史以设备基频提高...
Following Ewens' interpretation about Fisher's fundamental theorem of natural selection, the matrix game model for diploid populations undergoing non-overlapping, discrete generations is investigated. The total genetic variance is decomposed and it is shown that the partial change in the mean fitness, ...
vibrations/ fundamental natural frequencymaximum static deflectionrotating Timoshenko beamsnondimensional constantangular speed of rotation/ A4630M Vibrations, aeroelasticity, hydroelasticity, mechanical waves, and shocks A4340 Structural acoustics and vibration A4630C Elasticity...
The natural frequency of a beam plays an important role in not only vibration analysis but also understanding its dynamic characteristics. It is complicated to analyse the natural frequency of a stepped beam with discontinuously varying section. Approximate analysis methods such as Rayleigh-Ritz method...
This gives a quarterly-frequency series of forecasts, although from the first to the fourth quarters the actual horizons are 4, 3, 6, and 5, and the target moves from the current to the next year's growth rate between the second and third quarters. An alternative solution is to take a...
(2018) calibrate a New Keynesian OLG with investment adjustment costs, using age cohorts 20-99, and modeling the entire life-cycle at an annual frequency. Both studies mainly attribute the secular decline in the natural rate of interest since the 1980s to aging, with an estimated impact of ...
关键词: Theoretical or Mathematical/ civil engineering vibrations/ fundamental natural frequency shear wall multiple bands openings single-band structural component shear flexure cantilever racking shear bending fundamental lateral frequency coupled wall theory/ A4340 Structural acoustics and vibration ...
The time–frequency (t,f) approach is a preferred method to represent such multi-component signals as it allows solving the problem of estimating the characteristics of the components constituting the signal in Eq. (1). For example, it can provide a measure of the energy leakage that takes ...
4c). Of note, the optimal beat frequency was also not significantly different across the two visual experiments (exp. 3. vs. passive exp. 4: unpaired welsh t-test: t(46) = −.07, p = 0.95, Bayes factor = 0.29). Fig. 4: Motor contribution to visual temporal ...