弦構件 的英文怎麼說
中文拼音 [xiángòujiàn]
弦構件
英文
chord member-
3. the principle of the interleaver based on the interference of polarized light is analyzed theoreticallyand the interleaver architecture of this kind is presented. a 50ghz interleaver is designed and the two series of interleaved spectrum like cosine function is obtained experimentally ; by using the tandem of two birefringent crystals with different optical path difference, we get the flattop spectrum
3 、分析了pbi型interleaver濾波器的基本原理，給出了一種pbi型interleaver濾波器結構；設計了50ghz光學梳狀濾波器，實驗得到了該器件兩組交錯分波類餘弦輸出光譜；採用不同光程差的晶體級聯方案，實現了輸出光譜平頂化。Based on the 3d geometry vision, using java3d, for each of worktable and sine welding seam part of sheet, the ve modeling experiments achieve the construct of macrostructure, security virtual thickness and virtual guide based on error, and accomplish the space restriction of robot running. via the structured laser sensor ’ s getting three - dimension information, the experiments achieve the modeling of sine welding seam part of sheet by using programming
在立體視覺傳感系統獲得三維信息的基礎上，利用java3d建模技術，分別對工作臺、薄板正弦曲線焊縫工件進行建模實驗，完成了虛擬環境中宏觀環境模型的建立，並根據誤差建立了安全虛擬厚度和虛擬向導，完成了對機器人運動的空間約束;通過結構光傳感器獲得三維信息，編程實現對薄板正弦曲線焊縫模型的建立。Two - level algorithm is developed to deal with the two objective function optimal designs that are the radial constraint force and the axial force of the upper structure. corresponding program has been developed to optimize the prestress of the lamella ' s suspen - dome and kiewitt ' s suspen - dome. analysis of construction process is the key problem to suspen - dome
本文採用二級優化的步驟對徑向約束反力和上部桿件軸力兩個優化目標同時進行了預應力優化，並編制了相應的程序對聯方型和kiewitt型弦支穹項結構進行了預應力優化設計。The possible shear of the upper chord will change beam from flexural member to member under flexure and compression force. this is emphasised through design example. as a result ， we find that composite floor system is good for reducing the height of floor system
在組合樓蓋體系設計中，筆者指出，可能的桁架弦桿剪力會使作為桁架弦桿側向支承的梁由彎曲構件變為壓彎構件，這是在與桁架體系相適應的樓蓋體系設計中應該注意的一個環節。Several key techniques of carving and milling machine cnc system are deeply studied they include : the transformation, data rebuild and interface design of huge volume nc program produced by cam ; the algorithm of cubic parametric spline pre _ interpolation and high speed real time interpolation in the cnc system, which. will gain a much higher surface precision and cutting speed ; methodology and algorithm of movement velocity acceleration control on a real time forecast _ and _ prejudge basis is designed. therefore, a smooth movement is insured. the shake and noise problem caused by non _ uniform pules for driving stepping or servo motor is solved by an improving algorithm to generate uniform pules
同時，本文對基於統一的pc平臺的雕銑機數控系統中的幾項關鍵技術進行了深入的研究，包括： cam生成加工程序的傳送、接收、讀取及其加工鏈表的生成和實時重構；對cam生成的離散數據進行三次參數樣條插值和基於累加弦長的三次參數樣條插補控制，保證加工工件表面的精度和光順性；設計具有「前瞻」功能的自動升降速控制方法，保證加工過程的平穩性；通過脈沖均勻化，有效地解決加工過程中因為脈沖不均勻而引起的震動問題。The main work of this paper was as fellows : ( 1 ) generalized the development of pre - stressed steel structure in our nation and abroad, and pointed out the main problem in practice ; ( 2 ) presented the mechanism of pre - stressed steel structure and revealed its applicable range ; ( 3 ) established the optimization design model for pre - stressed steel structure, which accounts for constraints on stresses and displacements of structure ; ( 4 ) brought forward the optimization design method, which combined linear programming and the principle of full restriction, through which we can obtain the magnitude of each time pre - stress and the optimized sections of each members of structure ; ( 5 ) analyzed the best times of pre - stress and pointed out that 2 ~ 3 times is preferable ; ( 6 ) conducted optimization design on large - space steel roof, horizontal parallel steel truss with local cables, horizontal parallel steel truss with global cable, and ultra - static steel truss, the result of which indicated that the multiple pre - stress structure is very economic ; ( 7 ) compared different schemes of cable placement for horizontal parallel steel truss, and the results showed that the local cable only unloaded the second girders, but had no response on the first girders and stomach poles, while global cable could unload the second girders and the stomach poles outside of turning point of cable, thus proving that global cable is more economic than local - cable
本文的主要工作是：對國內外預應力鋼結構的發展歷史及現狀作了綜述和總結，指出當前預應力鋼結構工程實踐中存在的主要問題；闡述了預應力鋼結構的受力機理，並指出預應力鋼結構的適用范圍和特點；在考慮結構應力和變位約束的條件下，建立預應力鋼結構優化設計模型；提出多次預應力鋼結構優化設計方法和步驟，採用線性規劃和滿約束準則相結合的優化方法，可優化設計出施加的每一級預應力的大小，並得到結構各部分的優化截面；對多次預應力最佳的施加次數作了分析，並建議以2 3次為宜；為驗證文中理論和方法，分別對大跨多次預應力鋼屋架、局部布索的水平平行弦鋼桁架、整體布索的水平平行弦鋼桁架和局部布索的超靜定鋼桁架等算例進行了優化設計，經濟效益明顯；對水平平行弦鋼桁架的幾種施加預應力的方案進行比較，對于局部布索，預應力只對下弦起到卸載作用，對上弦和腹桿基本不起作用；而整體布索預應力除對下弦卸載外，對索折點以外部分腹桿也起到卸載作用，經濟效益好於局部布索。In order to avoid the current ripple and the high switch frequency of fixed - band hysteresis current controllers, two hysteresis controllers of change hystersis - band are proposed. one is the sinusoidal - band hysteresis current controller, the other is the adaptive hysteresis current controller based on fuzzy theory
由於常規的滯環電流控制器不能有效地防止負載電流脈動，並且存在著容易導致逆變器的開關器件的開關頻率過高的問題，論文提出了兩種變環寬滯環電流控制器結構，其一是正弦環寬滯環電流控制器，其二是模糊變環寬滯環電流控制器。A system with repmsm ( rare earth permanent magnet synchro - nous motor ) as executing motor is presented in this thesis. the hardware platform for the ac speed regulating system is based on tms320f240 dsp controller and uses ipm ( intelligent power model ) as the power device in the invert circuit
系統選用正弦波永磁同步電動機為執行電機，以ti公司的tms320f240dsp晶元為控制核心，以智能功率模塊（ ipm ）為逆變電路功率開關器件，構成交流調速系統的硬體平臺。In this paper, the foundamental principles of fd _ bpm ( finite - difference beam propagation method ) used to simulate and calculate the process of beam propagation is first introduced. then ， the theory of boundary condition is carefully presented. based on those theories mentioned above, a new kind of fd _ bpm arithmetic is brought forward. compared with the traditional arithmetic, this one has much more advantages. in virtue of the new arithmetic, author accomplished the whole simulating designs with two kinds of optical splitter ( stright y - junction optical splitter and sine - type optical splitter ), including propagation field simulating, vital parameter calculating, acquired some optimized waveguide parameters ， and finished the template by those results at last
本文主要藉助這種改進的fd _ bpm演算法，對兩種結構的光分路器（直y型光分路器，上升正弦型光分路器）進行了器件設計的軟體模擬，包括對兩種結構光分路器傳輸場進行模擬，並對兩種結構光分路器的重要參數，如波導寬度，分叉角，縱橫比，損耗進行了模擬計算；得到了一些有價值的優化波導結構參數值，根據這些優化值設計製作了光刻模板。Throught the comparation between supsendome and single layer reticulate, the advantages of suspend - dome was expatiated. through the analysis of lamella ’ s, rib - loop, rib - loop tilted bar type shell, the influence of lattice type to member ’ s force, joint ’ s displacement, reaction, intergral stability was studied, the suitable lattice type for suspendome was put forward
通過對聯方型、肋環型、肋環斜桿型、肋環斜桿型、肋環斜桿型弦支穹頂結構進行的分析優化比較，研究了網格形式對構件內力、節點位移、支座反力、整體穩定的影響，提出了適合弦支穹頂結構的合理網格形式。The asynchronous motor is widely used for its simple construction, ruggedness, high working reliability, relatively low cost, and high environmental adaptability. it is suit for the direction of high voltage, high speed and large capacity. vector control is its ideal speed modulation method. the harmonics of three - level inverter are less than the traditional two - level inverter ’ s, and it is convenient to realize high sinusoidal voltage output. the maximum voltage strength which each electric component bears is small, and it is easy for three - level inverter to realize large capacity. the research on the asynchronous motor vector control based on the three - level inverter is one novel work
異步電機結構簡單、堅固耐用、運行可靠、成本低、環境適應性強，容易向高壓高速和大容量方向發展，獲得了廣泛應用，矢量控制為其理想的調速方法;三電平逆變器輸出端諧波少，有利於實現輸出電壓的正弦化，且單個開關管承受的最大電壓小，適合向高壓大容量方向發展。對基於三電平逆變器的異步電機調速系統開展矢量控制研究，是一件有意義的工作。A s - bend symmetric y - branch has been proposed to obtain lower light transmission loss. 2. the design of electrode structure
在boa結構設計中，為了實現器件的低損耗設計，我們採用上升反正弦s彎曲構成對稱y分支。Taking beam with rectangular section as an example, the corresponding analytical solution of beam subjected to cosine distribution pressure is given through constructing the stress function satisfying all boundary conditions and biharmonic equation, which is a base of beam subjected to arbitrary distribution pressure
摘要以矩形截面簡支梁為例，通過構造一個滿足所有邊界條件和雙調和方程的應力函數，給出了梁受餘弦分佈力作用情況下相應的解析解，這為求解梁受任意分佈壓力作用下解的問題打下了基礎。Failure modes of two staggered truss steel framing buildings, the results indicate the plastic hinges mainly formed in truss members, especially concentrated to the vierendeel panel. it means the vierendeel panel in the center of the truss can provide significant ductility in the structural response and the failure mode is suitable for our performance services
指出分析所得的塑性鉸分布圖中，塑性鉸大量分佈在桁架腹桿和中間空腹節間弦桿處，而柱中塑性鉸發展則很少，這樣的破壞模式符合次要構件破壞，而主要受力構件基本不破壞的抗震設計思想。The working mechanism of shear connector of the staggered - truss system between reinforced concrete plank and steel chord was analyzed based on theoretical analysis and value computational methods, and details such as reasonable styles, types and quantity of the shear connector were introduced via a calculated example
摘要為推廣應用鋼結構交錯桁架體系，採用理論分析及數值計算方法，分析了交錯桁架結構樓板與鋼弦桿連接的抗剪連接件的工作機理。Valuable conclusion in engineering are drawn for practical design. the method of getting reasonable prestress degree for suspendoem which is restricted by intergral stability was discussed. optimizing programs are developed with the axis force and joint displacement of upper dome as object function respectively, the effective method of prestress degree for suspendoem which is
探討了穩定約束的弦支穹頂鋼索合理預應力度的優化方法，分別以網殼桿件內力、節點豎向位移和節點垂直向下位移為目標函數編制了優化程序，得到了整體穩定約束的弦支穹頂結構確定鋼索預應力值的可行方法。This thesis is part of the project of national science foundation of china “ study on color video coding based on four - dimensional matrix ”. a multi - matrix theory model has been established in the project. and the color video is presented into a four dimensional matrix model and the four - dimensional discrete cosine transform ( 4d - mdct ) is applied to reduce the correlation between color components and adjacent pixels
將多個彩色視頻幀構建在一個四維矩陣模型中進行運動補償預測、四維矩陣離散餘弦變換和矩陣量化，最後利用基於上下文的變長編碼方法進行壓縮，以全面去除彩色視頻各象素之間、各彩色分量之間以及連續幀之間的相關性，從而實現高信噪比條件下的高倍壓縮。Section design of symmetric reinforcement for compression rc members with small eccentricity
弦截法在對稱配筋小偏心受壓構件截面設計中應用分享友人