modal frequency meaning in English
模态频率
众数频率
Examples
- Modal frequency and vibration response of the gear box are computed by structural fem with a 3 - d fe model
建立齿轮箱三维有限元模型，采用结构有限元法计算齿轮箱模态频率和振动响应。 - The modal parameter identification using natural excitation technique and eigensystem realization algorithm are studied . reasonable results are identified . by introducing statistics to dispose the modal frequency of the structure , the preciseness and precision of the identified system mode are improved
研究了利用环境荷载激励技术和特征系统实现算法进行模态参数识别，引入统计方法对模态频率进行统计平均处理，提高了系统模态识别的准确性和识别精度。 - In chapter 3 , the non - linear equation was linearized with the jacobi matrix , and then the linearized equation was transformed into fixed frame to analyze the stability problem with eigenvalue method ( on - ground or hovering ) or floquet theory ( forward flight ) . meanwhile , the equation was perturbed by sweep frequency excitation from steady state to get transit decay of lag response which was then transformed into fixed frame with a numerical fourier coordination transformation ( fct ) . the fixed frame response along with the body response was analyzed via an fft to determine modal frequencies
然后,在稳态响应的基础上利用雅各比矩阵对非线性方程进行了线化,线化后的方程利用多桨叶坐标变换转换到固定系下后,利用直接特征值分析(地面、悬停)或floquet理论(前飞)对系统进行了稳定性分析;同时,对系统进行了瞬态响应分析;在系统达到稳态的基础上进行扫频激励,用fft变换求得系统频率,进而用移动矩形窗方法分析得到系统的阻尼。 - Based on structural dynamics , different damage diagnosis index , such as modal frequency variety , modal assurance criterion , co - ordinate modal assurance criterion , modal strain energy , remains force vector , modal strain , rigidity change , flexibility matrix , modal curvature and so on , are studied in this thesis
基于结构动力学理论,本文论述多种损伤识别指标的基本原理和计算方法,主要包括:固有频率变化率、模态置信因子、改进的模态置信因子、模态应变能、残余力向量、应变模态、刚度变化、柔度矩阵、曲率模态等。 - Based on the mode analysis of the stator of a ultrasonic motor using in - plane bending vibration , three kinds of in - plane vibration modes are obtained , and the influence of the motors structural parameters on its modal frequencies are discussed . some helpful conclusions are given , which provide theoretical basis for the design of this type of motor
运用有限元方法对利用平面内弯曲模态超声电机定子进行了模态分析，获得了三种不同类型的面内振动模态，并讨论了电机结构参数对其模态频率的影响，在此基础上得到了一些有益的结论，为利用平面内旋转模态设计超声电机定子提供了理论依据。