first natural frequency 中文意思是什麼

first natural frequency 解釋
一階自然頻率
  • first : adj 1 最初的，最早的。2 最上等的，第一流的。3 基本的，概要的。4 高音（調）的。n 1 最初，第一；第...
  • natural : adj 1 自然界的；關于自然界的。2 天然的；未開墾的；野生的。3 固有的 生來的 天賦的（opp acquired）...
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  1. Equation(4－198)yields a first approximation for the change in the natural frequency of vibration.

    方程（4198）給出了一級近似下的固有振動頻率的改變量。
  2. First natural frequency control and shape design of mast

    桅桿首階固有頻率控制與構形設計
  3. The first natural frequency map in working space was drawn, which can be useful for selecting proper working position to avoid resonance or low - order harmonic oscillation

    討論了頻率求解精度、收斂性與單元橫向彈性位移型函數以及單元數量之間的關系。
  4. ( 2 ) the crack compares with one depth with the first steps and the second steps natural frequency vibration, crack position near crank arm and main shaft transition round natural frequency little place under crankshaft ; with the third steps and the fourth steps natural frequency vibration, the smaller close to the second crank arm of crankshaft and round place natural frequency of the main shaft transition the position is

    （ 2 ）裂紋同一深度比以第1階和第2階固有頻率振動，裂紋位置越靠近曲軸中間曲柄臂與主軸過渡圓處固有頻率越小；以第3階和第4階固有頻率振動，位置越靠近曲軸第二個曲柄臂與主軸過渡圓處固有頻率越小。
  5. Then, we establish the finite element analysis models of the antenna in different structure layout, and obtain the corresponding frequencies and model shapes. finally, according to the importance of each object, we set up the model of multiple objects that aims to maximize the first natural frequency and minimize the mass. combining orthogonal experiment and variant weighting coefficient method, we formed an effective multiple objects optimized algorithm basing on the neural network and genetic algorithm

    本文首先詳細的敘述了天線結構的各組成單元，闡明了天線反射拋物面的形成原理；然後在ansys軟體環境中建立了不同結構布局下天線的有限元分析模型，分析計算了各種情況下天線的的固有頻率與振型；最後依據天線各指標的重要性，建立了以一階固有頻率最大、質量最小為目標的天線結構多目標優化設計模型，並基於神經網路和遺傳演算法，結合正交實驗和變加權系數技術，形成了一種有效的多目標優化演算法，在matlab平臺下實現了天線的結構多目標優化設計計算程序，求得了天線的最佳結構參數。
  6. Abstract : it is the first time to use powder damping technique in reducing the vibration and noise of cold saw clamp. through measurement and analysls of the noise reduction effects and frequency spectrum, it is found that powder damping is a simple and practical technique, and influences on the strength and natural characteristics of the clamp are small

    文摘:把粉體阻尼技術首次用於冷鋸機夾盤的減振降噪，通過對其降噪效果及頻譜的測量分析，發現粉體阻尼不但是一種簡單實用的技術而且對夾盤的強度和固有特性影響小。
  7. It is shown that the effects of the stiffness and inertia of the piezoelectric element that lead to higher first natural frequency on the natural frequencies of the beam are significant, and that of the elastic modulus of the bonding layer is small

    研究表明，壓電元件的剛度和慣量對梁的頻率影響很大，變截面智能壓電梁的一階固有頻率總是高於等截面梁的固有頻率。
  8. Based on the optimal topological, structural modification has been implemented ; and it makes the structure has higher first - order natural frequency and less weight

    在最優拓撲結構的基礎上進行結構修改後，一階固有頻率明顯提高，而重量有所減小。
  9. Studies indicate that : ( 1 ) it is the approach of the first natural frequency of the handle ( 43. 9hz ) and the working frequency under the rated rotate speed of the engine, due to the unreasonable mechanism design, that causes the serious vibration on the handle of the gn31 cultivator

    研究表明： （ 1 ） gn31耕整機扶手架的振動量過大主要是由於扶手架的1階固有頻率（ 43 . 9hz ）和耕整機發動機的額定轉速下的慣性力1階頻率（ 43 . 3hz ）接近，為扶手架結構設計不合理所致。
  10. Theoretical research on the type and mainframe tripled frequency converter : on the basis of building finite element models, dividing grid, application of load in the software of ansys, the dynamic and static performances are calculated, the value of the deformation, the first natural frequency and corresponding mode of the frequency converter are obtained, finally, the dynamic performances of the frequency converter are analyzed

    對型三倍頻組件和主機三倍頻組件的理論研究:採用通用ansys軟體對組件進行合理建模，劃分網格，施加載荷，在此基礎上對它們進行了靜態分析和動態分析，得到最大變形量、低階固有頻率和相應的振型，並對組件的動態性能進行了分析。
  11. Finally, the size of the crack is identified by using the identified crack location and the first natural frequency

    最後，利用已識別的裂紋位置和第一階固有頻率定量地識別了裂紋尺寸。
  12. Modal analysis, frequency response analysis, random vibration analysis and vibration fatigue analysis are carried out based on the modified finite element model. the first natural frequency of pcb is 57 hz, and the dynamic response in the first natural frequency is the largest. weak points are also found

    為分析該印製電路板可靠性及設計缺陷，需對修改過的有限元模型進行模態分析、頻率響應分析、隨機振動分析及疲勞壽命分析，以全面了解該印製電路板的動態特性（包括:印製電路板的固有頻率、隨機振動響應情況） ，以及存在的薄弱環節。
  13. The first natural frequency calculated from these models coincides well with measured result

    由修正模型計算得到的轉子系統固有頻率與實測的轉子系統固有頻率吻合良好。
  14. In order to gain high reliability, when designing pcb these questions must be considered : whether the first natural frequency of pcb is large enough or not ? what are the dynamic characteristics of pcb and where are the weak points of pcb

    因此，為了保證印製電路板的高可靠性，就必須在印製電路板的設計和振動分析過程中，考慮以下問題:印製電路板的固有頻率是多少，使用中是否會發生共振破壞
  15. Equation ( 4 198 ) yields a first approximation for the change in the natural frequency of vibration

    方程（ 4 198 ）給出了一級近似下的固有振動頻率的改變量。
  16. ( 5 ) by studying the natural frequency of the reinforced earth retaining wall, the basic discipline of the first four natural frequencies is found out

    （ 5 ）對加筋土擋墻的前四階自振頻率進行了研究，得到加筋土擋墻的前四階自振頻率的基本規律。
  17. At first the method for calculating the fundamental natural frequency of structure is researched

    首先研究了結構的最低階固有頻率的計算方法。
  18. An fem model of rotor - bearing system was set up for a single - span - two - disc test rig to obtain such model parameters as the first and second order natural frequency and vibration mode vectors

    摘要以某單跨雙盤模型轉子實驗臺為例，建立了該轉子軸承系統有限元模型，得到轉子系統前兩階固有頻率和振型向量等模態參數。
  19. Abstract : in this paper we establish a structure analysis model and a structure optimization design model for the outer ring of three - axis simulating table. via quasi - newto nmethod, which is based on characteristic model, optimization design is accomplished, and the scheme thereof is concluded within constraints of first - order natural frequency and static deformation

    文摘:建立了某三軸模擬轉臺的外框的結構分析模型和結構優化設計模型，利用基於性態模型的擬牛頓法對其進行了優化設計，得出了在一階固有頻率和靜態變形約束下的最優方案。
  20. ( 2 ) compared with one depth crack, with the first steps and the second steps natural frequency vibration, at 0. 5 o ' clock of position, the natural frequency is smaller ; with the third steps and the fourth steps natural frequency vibration, comparing with the time of nearing 0. 25 position, the natural frequency is smaller

    （ 2 ）裂紋同一深度比，以第1階和第2階固有頻率振動，位置比越靠近0 . 5時，固有頻率越小；以第3階和第4階固有頻率振動，位置比越靠近0 . 25時，固有頻率越小。
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