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Based on finite element method,it is obtained to the trend of part modal frequency and the amplitude by simulating different extent of damage.
应用有限元程序进行模态分析和频响分析,得到在不同损伤度的条件下轮对局部模态频率和振幅幅值的变化趋势。
THE MODAL FREQUENCY RESPONSE ANALYSIS OF AXLE BASE OF STEYR
ENGINE COOLING FAN IN THE CASE OF AXLE LENGTHENED 160 mm
Steyr 发动机冷却风扇轴加长 160mm 后轴座的模态频率响应分析
IDENTIFICATION OF MODAL FREQUENCY AND WEAK MODAL OF MACHINE TOOL VIA DDS METHODOLOGY
用DDS方法识别机床模态频率和薄弱模态
STRUCTURE DAMAGE MONITORING BASED ON SUPPORT VECTOR MACHINE AND MODAL FREQUENCY
基于支持向量机和模态频率的结构损伤诊断
Dynamic Optimum Design of High-speed Precision Press based on Modal Frequency
基于模态频率的高速精密压力机动态优化设计
the first mode frequency of the switch is 500Hz.
测到第一模态频率是500Hz。
Identifying Mode Frequency of Vibration Systems with Wavelet Transform and SVD
利用小波变换与SVD识别振动系统模态频率
Accelerators are not suitable for controlled structures with lowest mode frequency less than 1.0 rad/s.
对于最低阶模态频率较低(小于1.0 rad/s)的受控结构的主动控制系统不宜采用加速度传感器.
First according to the matching of driving mode frequency and detection mode frequency, the structure dimensions of the comb
gimbal micromachined gyroscope are optimized using a
finite element method (FEM).
根据驱动模态频率和检测模态的频率相互匹配 ,用有限元法优化了振子框架式微机械陀螺的结构尺寸 ;
The simulation of the mode frequency and the study of the relation between the displacements and the stress indicate that this flexure hinge has good flexibility and linearity between the displacement and the maximum stress.
研究了基于复合式悬臂梁柔性铰链的二维十字对称柔性铰链结构，对其模态频率以及位移应力特性进行仿真试验; 结果表明此种结构形式的运动对称性很好;
Error of physical parameters and modal frequencies decrease to 1% and 2% respectively when the simulated data is used as reference.
基于仿真数据的修正,模态频率误差在1%以内,参数误差在2%以内。
Correlation analysis of modal frequencies and physical parameters in stochastic structure
随机结构模态频率与物理参数的相关分析
In this paper, the finite element analysis software (ANSYS) is applied to the modal analysis of model ZJ30/1700CZ drilling machine derrick under natural condition and loaded condition separately. The preceding 9 steps modal frequencies and the corresponding vibration modes of the derrick are calculated.
应用有限元分析软件 ANSYS对 ZJ30 / 170 0 CZ型钻机井架分别在自然状态下和有钩载状态下进行模态分析 ,计算得出了井架的前 9阶模态频率及相对应的主振型。
Results of these comparisons identified by the two methods showed coherence and maximum discrepancies of 5.4 percent on modal frequencies and 9.9 percent on modal damping values.
试验结果显示,二种方法对模态频率和阻尼比的识别误差分别不超过5.4%和9.9%。
The results show that the wall thickness t1 affects the modal frequencies more than the thickness t2 of the working board. So the dynamic stiffness of the base can be increased and also the production cost can be reduced through improving the wall thickness t1.It offers evidence for structural optimized design.
分析表明 :机座外壳四周壁厚t1 对机座的前四阶模态频率有较大影响 ,而机座工作面板厚度t2 对机座的前四阶模频率影响不大 ,故可以通过改变机座四周壁厚t1 来提高机座结构的动刚度 ,同时又使材料消耗最少 (t1 =1 5mm时为最佳 ) ,为机座的结构优化设计提供了依据。
4. The four models 、parameters and the frequency of fluid are obtained andthe relation between fluid depth and model frequency is studied through the modelanalysis experiment to the rectangular elastic fluid-shell coupled system.
4.对矩形弹性壳液耦合系统进行了模态实验分析,给出四阶振型和模态参数及液体的若干阶模态频率; 研究了液体深度与模态频率的关系。
FEA simulation method was applied to rigid gear of model XB-80-134H harmonic drive. The model frequency and model shape were given by applying constraints with real work condition to rigid gear, such as more precise element and high density of meshing.
以XB-80-134H型谐波减速器的刚轮作为研究对象,运用有限元分析的方法,对其施加满足实际工况的约束,在计算机容量允许的情况下,选择精度更高的单元和划分更细的网格密度,计算出刚轮的模态频率以及模态振型。
The results of numerical experimentations show that, with the creasing of structural parameters variation, the varies of mean values of modal frequencies are monotonic, the mean value of low-order modal frequency is monotonic decreasing, the mean value of high-order model frequency is monotonic increasing, all the mean values of modal damping ratios are monotonic increasing for the small damping scale-model, and the relative mean value deviation factors of first order mode are very small.
数值试验结果表明,对于小阻尼比例模型,随着结构参数变异性的增大,系统模态频率均值单调变化,较低阶模态频率均值单调减小,高阶模态频率均值单调增加; 模态阻尼比均值单调增加;
Using the AR model auto - regression coefficient to form function of distance - based identification, defining structural damaging diagnostic parameter and introducing statistic analytical method to identify abnormal structural state and lacate damage. Numeric experiments have shown that the method has a relative higher capacity of the damaging identification compare to those which bases on the variety of the model frequency.
利用AR模型的自回归系数构造距离判别函数、定义结构损伤特征参数,并引入统计分析方法,对结 构的异常状态诊断及损伤定位．数值实验表明,与基于模态频率变化的方法相比,该方法具有更高的损伤 识别能力．
The vibration characteristic of the smart structure is measured to obtain the variety of model frequency at different temperatures.
对结构的振动特性进行了测试,得到了不同温度下的模态频率变化。
查询“模态频率”译词为用户自定义的双语例句&&&&我想查看译文中含有：的双语例句
为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& In order to develop a mathematical model of the frame of Automobile Type 221 for dynamic analysis, a modal test is conducted by the appropriate harmonic multipoint-excitation technique, and the first eight modal frequencies and mode shapes are obtained. The corresponding generalized masses and structaral darnings are found through the method of complex power supplied, as well as through the method of added mass and the method of force in quadrature under the same conditions. A comparison is made among the r... &&&&&&&&&&&&为了建立221型汽车车架动力分析数学模型,用适调多点激振法进行了模态试验,测出了前八阶模态频率和(空间)振型。用复数功率法测出了它们相应的广义质量和结构阻尼系数。并在同样条件下,还用附加质量法、正交力法测出了同一试件前八阶模态的广义质量。本文将这些结果与复数功率法所得的结果作了比较和分析。&&&&&&&& Torsional vibration of engine crankshaft is an important dynamic problem.This paper uses the modal analytical method to study the torsional vibration of crankshaft system, which is the same as torsional vibration of single degree of freedom. The test method, using linear acceleration transducer to measure torsional vibration response and how to isolate torsional vibration mode is discussed in detail. Finally, based on modal principles, a modal frequency response fun and using these moda... &&&&&&&&&&&&扭转振动是发动机一个重要的动力问题。本文用模态分析方法研究曲轴系统扭转振动。已经证明,曲轴系统扭转模态与车自由度扭振系统是等效的。进一步讨论曲轴系统扭振模态试验方法,指出用线加速度传感器测量扭振响应是行之有效的和说明如何分离曲轴系统扭振模态。本文最后根据扭振模态原理,建立模态频率响应函数,应用模态数据确定发动机临界转速,计算曲轴扭振变形、应力和截面扭矩等响应。&&&&&&&& This paper deals with the elimination of the self-excited vibration of the front wheels of Jiefang CA-10 tanker through varying the modal parameters of the vehicle's suspended structure. A brief description about the mathematical model of front wheel shimmy is given. &&&&&&&&&&&&本文介绍了改变悬置上结构模态参数消除解放CA-10油罐车导向轮自激振动的方法,并简述了导向轮摆振的数学模型。模型计算结果的分析表明改变悬置上结构一扭模态频率可以消除油罐车导向轮自激振动。为找出改变一扭模态频率的简便途径,建立了油罐—车架组合结构的数学模型。计算与试验的结果表明相当吻合。改变连接条件是改变一扭模态频率消除油罐车自激振动的简易方法。&nbsp&&&&&&&&相关查询:
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摘要关键词：振动系统；单自由度；MATLAB；多自由度
AVibration system is to study the kinematics and dynamics of mechanical vibration, the vibration of a single free system has practical significance, because there are many engineering problems by simplifying, using the vibration theory of a single degree of freedom system can be satisfied with the results.
Vibration system problems is a relatively virtual problems, more abstract and theoretical analysis, problem analysis for a mathematical model can be materialized by MATLAB can be converted into images. Single degree of freedom frequency, damping, mode shape analysis, we can create mathematical models, the final program data through the use of MATLAB many degrees of freedom main matrix iterative solution, our analysis based on abstract theory, while MATLAB programming The last iteration of data can be the desired data, so our calculations easier
Using MATLAB programming and verify the correctness of the program.Through the process of operation, can quickly obtain multiple degrees of freedom vibration system and the main vibration mode natural frequency for the design to prevent resonance provide the theoretical basis for the preliminary analysis of the vibration of each component, and laid the decoupling of system response basis.
Key words: Single Degree of FMATLAB; multiple degree of freedom
1.1问题的提出
机械振动是一门既古老又年轻的科学，随着人类科学技术的不断进步振动理论得到不断的发展和完善。机械振动在许多情况下是有害的，人们想方设法避免它：另一方面，人们利用机械振动原理制造了各种机械或仪表来为人类服务。振动机械是20世纪后半期得到迅速发展的一类机械，它是利用振动原理来完成各种工艺过程的机械设备。其中，Mathorks公司推出的MATLAB以其强大的功能和易用性受到越来越多科技工作
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