方向餘弦 的英文怎麼說

中文拼音 [fāngxiàngyúxián]
方向餘弦 英文
direction cosine
  • 方 : Ⅰ名詞1 （方形; 方體） square 2 [數學] （乘方） involution; power 3 （方向） direction 4 （方面） ...
  • 餘 : Ⅰ同「余」Ⅰ-Ⅳ1. Ⅱ名詞（姓氏） a surname
  • 方向 : direction; orientation
  1. The bar directions are conveniently specified by direction cosines.

    桿的方向通常用方向餘弦來表示。
  2. The nine elements of the matrix are products of cosines of angles between the direction of a streamline at a point and the coordinate axis.

    這矩陣的9個元素系一點的流線方向和座標軸之間夾角餘弦的乘積。
  3. On the basis of the theory of thin shells and the non - moment assumption, the equations of the motion of the conical shells under lateral cosinoidal loading are derived in the case of ignoring shearing stress

    基於薄殼理論和無矩假定，在略去剪切應力的情況下推導了圓錐殼在側向餘弦載荷作用下的運動方程，並採用半解析差分方法進行了數值求解。
  4. At first, some advances in the research of dynamic response of cylindrical shells and conical shells are reviewed, and those approaches for studying such kind of problems are summarized here as well. the main objects studied in this paper are the transient response of cylindrical shells under longitudinal line - loading and that of conical shells under cosinoidal impulsive loading

    首先回顧總結了圓柱殼和圓錐殼動力響應的研究進展情況，並簡單歸納了該類問題研究的方法，確定了本文的研究對象主要是縱向線載荷作用下的圓柱殼瞬態響應和餘弦沖擊載荷作用下的圓錐殼瞬態響應。
  5. Following, using the experimental methods, the dynamic response of the stiffened conical shells under cosinoidal impulsive loading is studied. the changes of dynamic response of points along circumferential line of the conical shells are analyzed, and the characteristics of dynamic response of points are studied by both the time - domain analytic method and the frequency - domain analytic method

    採用實驗方法研究了加筋圓錐殼在側向餘弦載荷作用下的動力響應，分析了沿環向各點的響應變化，並從時域和頻域分析了它們各點的響應特性。
  6. On the base of above it, this paper discuss the synthesis of optimum distributed arrays by nonuniform spacing in the sense of dolph - chebyshev. having derived the equations of optimum element distribution, we analyze the exponentially spaced array, which are optimum when the elements are isotropic and equally weighted, and the array by general raised cosine function. the formulate for estimating the sidelobe envelope, beamwidth of the array pattern and clean region width are obtained

    推導了最佳陣元分佈方程，分別對陣元無方向性和等加權時的最佳分散式陣列? ?指數間隔陣列和採用廣義升餘弦加權的最佳分散式陣列進行了分析，推導了天線方向圖旁瓣包絡、波束寬度，干凈掃描區寬度的估計公式，給出了近軸旁瓣電平與陣列參數的關系。
  7. A method of face detection based on support vector machine ( svm ) is put forward. the features are extracted by applying the discrete cosine transform ( dct ) to the preprocessing image. the dct coefficients are inputted to the svm and the svm are trained using the cropped face samples and the " bootstrapping non - face " samples

    對預處理后的圖像進行離散餘弦變換提取特徵，取dct系數作為支持向量機的輸入，將經過裁剪的「人臉」樣本與「自舉」方法得到的「非人臉」樣本一起用來訓練支持向量機。
  8. 2. the updating algorithm of strapdown matrix is one of the crucial techniques of sins. there are several kinds of attitude updating algorithms of sins, such as direction cosine algorithm and quaternion algorithm

    捷聯矩陣更新演算法是捷聯系統的關鍵技術之一，捷聯慣導系統姿態演算法有歐拉角法、方向餘弦法、四元數法和圓錐補償演算法等幾種方法。
  9. Two approaches to evaluating the performance of this similarity measure and the comparison with standard cosine vector similarity measure are also described

    進一步給出了對基於本體的相似性測度方法進行效果評價的2種策略以及該方法與經典餘弦向量測度方法的比較結果。
  10. To improve document clustering, a document similarity measure based on cosine vector and keywords frequency in documents is proposed, but also with an input ontology

    為了改進文本聚類的效果，提出了將領域知識本體和文本關鍵詞詞頻相結合的基於餘弦向量的文本相似性測度方法。
  11. A method that combines category - based and keyword - based concepts for a better information retrieval system is introduced. to improve document clustering, a document similarity measure based on cosine vector and keywords frequency in documents is proposed, but also with an input ontology. the ontology is domain specific and includes a list of keywords organized by degree of importance to the categories of the ontology, and by means of semantic knowledge, the ontology can improve the effects of document similarity measure and feedback of information retrieval systems. two approaches to evaluating the performance of this similarity measure and the comparison with standard cosine vector similarity measure are also described

    介紹了一種綜合各層級分類類目和對應關鍵詞來構造概念體系並用於改進信息檢索系統效果的方法.為了改進文本聚類的效果，提出了將領域知識本體和文本關鍵詞詞頻相結合的基於餘弦向量的文本相似性測度方法.該本體面向特定領域，將關鍵詞以不同權值對應于各分類類目，通過其語義知識來改進文本相似性測度以及信息檢索系統的效果.進一步給出了對基於本體的相似性測度方法進行效果評價的2種策略以及該方法與經典餘弦向量測度方法的比較結果
  12. About the transducer between rotor and power source, the paper uses a cycloconverters, comprising 36 thyristors, and analyzes the control of circumfluence, the method of cosine crossing, the producing of trigger pulse, zero current detecting, commutating logic control and its mathematical model

    對雙饋電機轉子側所接變頻器類型，本文也進行了對比分析，對選用的循環變流器的原理還作了進一步的分析，包括環流控制方法、餘弦交截法原理、觸發脈沖產生、零電流檢測和換向邏輯控制等部分，並給出了其數學模型。
  13. Based on the transfer - matrix method, the general expressions of equivalent four - terminal network parameters of varying section torsional horn are derived, the relations between frequency equation and both the rotational velocity amplification and that of the surface tangential velocity of stepped type torsional ultrasonic horn with transitional section of cosine - like type are obtained

    摘要基於傳遞矩陣演算法，推導出了變截面桿扭轉振動時等效四端網路參量的一般表達式，研究了帶類餘弦過渡段階梯形變幅桿扭轉振動頻率方程與角速度放大倍數及外表面切向速度放大倍數等的關系。
  14. In the latter, that is in two - position alignment, the method of wavelet analysis is used to filter the output signal of optic fiber optic gyro, at last, the direction cosine matrix is gotten, the inertial components are demarcated,

    在自對準中，利用二位置初始對準，運用小波分析對光纖陀螺的輸出信號進行濾波，並且確定初始方向餘弦矩陣並對慣性元件進行標定。
  15. A method of face classification and recognition based on dct and svm is proposed. the features are extracted by dct and a small set of dct coefficients are inputted to svm. the experiments show that the performance is satisfactory

    提出了一種基於dct和支持向量機的人臉分類和識別方法，首先對人臉圖像作二維離散餘弦變換，取離散餘弦變換系數作為特徵輸入支持向量機，然後用支持向量機進行性別分類及人臉識別。
  16. We simply introduce the application of quaternion numbers in inertial measurement, research the calculation of direction cosine array and introduce equal rotating vector to analyze cone error

    介紹了四元數法在慣性測量中的應用，研究了方向餘弦矩陣的計算方法，並引入等效旋轉矢量對圓錐誤差進行了分析。
  17. By the analysing method of direction cosine matrix, we set up motion analysing model of spherical gear and fluted disc of this gear, thus provide the theoretical basis for control system design of actuating mechanism

    利用方向餘弦矩陣分析法建立了球齒輪機構和球齒輪齒盤機構的運動分析模型，為執行機構的控制系統設計提供了理論依據。
  18. This dissertation chiefly studied the theory of aoa detection using polarization. polarization coding aoa detection was put forward after compared with some other ways to detect laser aoa. the method based on law of cosines of radiation

    本論文分析和比較了激光束定向的幾種方法，基於輻射通量的餘弦定理，根據偏振光特性，提出了偏振編碼測向的方法。
  19. It has excellent estimation precision, pairs automatically the x - axis direction cosines with the y - axis direction cosines and suffers no doa ambiguity

    具有較好的估計精度，能實現方向餘弦的自動配對，不造成波達方向的模糊性。
  20. This direction finding algorithm may resolve uncorrelated monochromatic sources, but it assumes that all signal frequencies are distinct. it requires no a priori knowledge of the signals " frequencies, suffers no frequency - doa ambiguity, and pairs automatically the x - axis direction cosines with the y - axis direction cosines

    該演算法用單矢量水聽器，在無需知道信號先驗信息的條件下，可以實現對多個不相關信號的方位角估計，並且不受頻率模糊度的影響，自動匹配x軸、 y軸的方向餘弦。
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