模態振型 的英文怎麼說
中文拼音 [mótàizhènxíng]
模態振型
英文
modal shape-
Based on a duralumin flexible beam with piezoelectric films attached, distributed parameter modal described by partial difference equations is builded, and then turned into a set of two order systems with the method of modal analyse. state feedback control and independent modal control is investigated. and simulation of the closed - loop system with thest two methods is performed in matlab
並用模態分析的方法，將系統的偏微分方程模型轉化成了模態模型；研究了狀態反饋和獨立模態方法；進一步完善了軟體界面以及軟體功能；在實際系統中，應用狀態反饋演算法，有效抑制了懸臂梁在受到外界瞬時脈沖擾動和激振引起的一階、二階模態振動。Basing the theory of finite elemental modeling and ansys software, this text build the entitative model and elemental model of the main parts and carry the modal analysis. and we get the natural frequency and shaking type of all steps. and then we compare the analysis results with the results of experimental modal analysis, testing the correctness of the elemental model
本文根據有限元建模理論，並利用ansys有限元分析軟體，分別對螺桿泵地面驅動系統的上述主要部件進行實體建模、有限元建模以及模態分析，確定這些部件的各階固有頻率和振型。Mode is structure ’ s inherence characteristics, each mode has specifically resonant frequencies, damping values, mode shapes, mode stiffness and mode mass
模態是結構的固有振動特性，每一階模態都具有特定的固有頻率、阻尼比、振型、模態剛度和模態質量。It shows that the modal shape and mode frequency are highly coupled with the viv response of a marine riser with low mass ratio
該模型的計算結果表明，立管的模態振型、模態頻率與渦激振動響應高度耦合，並且對于低質量比的情況尤為明顯。With dynamical modal analysis of electron gun by use of ansys software, we can get the inherent frequency and vibration model, which can avoid sympa - thetic vibration
利用ansys軟體對電子槍進行動力學模態分析可以得到電子槍的固有頻率和振型，從而在結構設計上避免共振。Presents the model proposed for analyzing the vibration characteristics of shrouded blades and their calculation method by employing a wave propagation theory and modal synthesis technology coupled with a finite element method from the view point it is possible not only to conduct frequency modulation of the shrouded blades of a gas turbine, but also to utilize the friction effects between them to dissipate energy, thereby attaining the aim of vibration alleviation, as shrouded blades have been widely used in the design of high - speed turbomachinery, such as modern gas turbines and steam turbines, and with the shrouded blades forming an integral whole in a centrifugal force field, the vibration characteristics of the whole ring of blades are different from those of a single isolated blade, and this makes it essential to take into account the integral effect of blade shrouds, concludes from the calculation examples and engineering application that the above approach is valid and correct along with the possibility of considerably reducing the scale of calculation and analysis, and points out it is necessary to take into consideration the coupled effect of the whole ring of blades while the dynamic characteristics of shrouded blades is being analysed
帶冠葉片不但能調頻，還可以利用葉冠之間的摩擦效應來耗散能量，達到減振的目的.帶冠葉片在離心力場中形成一整體，其整圈葉片振動特性不同於單個孤立葉片，需考慮葉冠的整體效應.利用帶冠葉片系統的循環對稱性，提出了採用波傳播理論和模態綜合技術，結合有限元方法研究燃氣輪機帶冠葉片振動特性的分析模型和計算方法.算例和工程應用證明了該方法是效性的、正確的，並可以大大降低計算分析規模.研究表明帶冠葉片動力特性分析時必須考慮整圈葉片的耦合效應Structure damage detection based on mode shape
基於模態振型的結構損傷識別Dynamic tests are applied to the beams, and during the course of the dynamic testing, mode parameters were obtained under the initial state, prestressed state and different damage degrees of the beams
振動測試分別在試驗梁的初始狀態，張拉完畢，以及各種不同的損傷狀態下進行，動力試驗數據主要包括自振頻率以及模態振型。In theoretical analysis, finite element method is firstly used to solve the mechanical - electric coupling problems in a flexible plate with piezoelectric elements and to obtain structural vibration modal shapes. focusing on collocated type of piezoelectric sensors / actuators, the maximum determinant of fisher information matrix criteria is chosen as the optimization function and then simplified to determine an optimal principle for the best location of piezoelectric elements
本文研究柔性板振動控制中壓電元件的位置優化設計問題，針對壓電傳感器和驅動器的同位布置結構型式，將壓電元件的有限元分析方法與d優化設計準則相結合，直接利用結構的模態振型確定壓電元件在柔性板上的最優位置。Take the wheel of underground as the model, use the analysis to solve its modals and natural frequency, and make sure that the biggest vibration amplitude below five thousands hz comes out at the tread and the web
以地鐵車輪為模型，求解其固有頻率及模態振型，確定車輪在0 ~ 5khz頻率范圍內的主要振動為踏面的徑向振動和輻板的軸向振動。By analysis of the transfer function and modal shape, we can draw a conclusion that this system is different from the common frame structure and even different from other types of structure with special - shaped columns. so the necessity of the studying has been verified
通過對傳遞函數的分析以及對模態振型的回歸計算，找到了該結構體系由於其特殊的施工方式和構造措施與一般框架結構體系及異形柱填充墻體系相比所具有的特點。As to the polyreference implemention of the least - squares complex frequency - domain estimator in mathematical separation technique of modes, this thesis builds a right matrix - fraction description model to estimate the system poles. then frequency point stabilization diagram is set up and analyzed to automatically determine natural frequencies, modal damping ratios and modal participation factors. finally mode shapes are identified based on the least squares theory
對于模態數學分離技術的多參考點最小二乘復頻域識別技術，先建立右矩陣分式頻響模型，識別出系統極點，再通過建立和分析頻率點穩態圖，能自動的確定出結構的固有頻率、模態阻尼比和模態參與因子，最後根據最小二乘原理識別出模態振型向量。A finite elements model of rail is built in this paper. after model analysis in ansys, natural frequencies and modes is get
本文用有限元法建立鋼軌模型，進行模態分析，得到鋼軌模型的固有頻率和模態振型。On the basis of finite element modal analysis and experiment modal analysis, parameters identification is done and the inherent frequencies and modal shapes are obtained
利用有限元模態分析和實驗模態分析進行參數識別，得出了固有頻率和模態振型。Theoretically speaking, certain crack or damage in structure will result in reduction of stiffness in the local part, and also will result the stress and strain concentration in the same part
理論上，結構的局部裂縫或損傷必然會導致結構局部剛度降低，從而使應變在損傷處發生集中，應變模態振型數值發生突變。In this thesis, the author combined the theory analysis and the finite elements analysis to study the vibration performance of the elastic arm. found the natural frequencies and the modal shapes of the elastic arm of 1 inch hdd around the working frequencies
本文通過理論分析和軟體模擬相結合的方法，對微硬盤磁頭彈性臂的振動特性進行了研究，找到了一英寸微硬盤磁頭彈性臂在工作頻率附近的固有頻率和模態振型。Then the author gives emphasis to the analysis of the elastic arm in microdrive, builds the simplified continuous model, analyzes the model with vibration theory. the natural frequencies and modal shapes are deduced. the author builds discretized models of a few structures of the elastic arm, simulates the influences of the structure with ansys software
接下來，重點對微硬盤磁頭彈性臂進行了分析，建立了簡化的連續系統模型，並用振動理論來分析該系統，求取其固有頻率和模態振型，並對微硬盤磁頭彈性臂的幾種結構進行了離散化建模，分析了這些結構對整體特性的影響，並用ansys有限元軟體進行了模擬。After meshed the model, the finite element model is built. make a structural analysis to the finite element model, the author found the frequencies of the elastic arm in microdrive. and the natural frequencies that are around the working frequencies and the modal shapes of the elastic arm are analyzed
並將建立好的三維實體模型導入ansys中進行網格劃分，建立了微硬盤磁頭彈性臂的有限元模型，並對其進行有限元結構分析，得到了微硬盤磁頭彈性臂的各階固有頻率，並對其工作頻率附近的各固有頻率和模態振型進行了分析。Based on the simplified principle, the modal shapes of selected structural modes are converted into modal strains. to minimize the calculation error, curve - fitting technique is used in the process. the modal strains are summed together to determine the global distribution of the structure for selected vibration modes so that the position of piezoelectric elements could be optimally determined according to the simplified optimization principle
通過二階中心差分運算將模態振型轉化為模態應變，採用應變曲線擬合方法降低離散誤差，進而將各階待控模態應變進行疊加，獲取系統整體特徵應變分佈情況；最後根據壓電元件位置優化的簡化目標函數，將壓電片的最優位置確定為柔性板疊加模態應變的極值區域。This paper aims at model of vertical tail based on certain type aircraft. the method of distributed actively vibration control based on multi dsp has been carried on this model. a distributed actively vibration control system based on dsps is designed to real timely control the structural vibration of two modes
本文以某型飛機的尾翼模型為目標，採用基於多dsp處理器的分散式控制方法實現對垂直尾翼模型的振動主動控制，開發出了一套基於dsp的振動主動控制系統，針對結構的兩階模態振動實施了分散式振動主動控制，並進行了相關的理論和實驗研究。分享友人