economical variable 中文意思是什麼

economical variable 解釋
經濟變數
  • economical : adj. 1. 節儉的，儉約的；經濟的，合算的。2. 經濟學上的。adv. -ly
  • variable : adj 1 易變的，變化無常的，無定的 （opp constant steady）。2 可變的，能變的；變換的。3 【數學】變...
  1. The continuously variable transmission ( cvt ) is an ideal transmission form for economical automobiles

    金屬帶式無級變速器（ cvt ）是經濟型轎車的理想傳動裝置。
  2. Steel frame with welding joint easily occur brittle collapse because of having a low ductility at joints then ， a semi - rigid connected steel frame has large the energy absorption capacity which can resist dynamic loads and the using steel qualities of bracing system and joints are small so adopting a semi - rigid jointed steel frame is economical and stable but for semi - rigid connections are complex and variable ， in conventional analysis and design of steel structures ， it is usually assumed that the connections between columns and beams are either rigid or pinned the analysis of steel frames adopting the assumption can simplify the procedure of analysis and design ， but cannot precisely reflect structural practical circumstance and the errors of calculating results are large ， even ， get incorrect conclusions semi - rigid connection was referred to in chinese code for design of steel structures ( 2001 ， 10 ) ， however ， it isn ’ t specified how to apply semi - rigid joints in design in fact it cannot be carry out the purpose of the paper give a calculating method that accords practical engineering and easily put into effect worthwhile it is going to promote the development of semi - rigid jointed steel frame in design and heighten structural stability in the paper ， at first some commonly employed methods for the modeling of connection behavior are introduced richard abbott function modeling of connection is adopted for extended end plate bolted connection by the 34 test data comparing to regression analysis indicate richard - abbott function modeling of connection represents an excellent fit to test data then after a semi - rigid joint behavior can be modeled as a finite stiffness rotation spring ， base on rotation and displacement equation derive the element stiffness matrixes with semi - rigid connections where the effects ofj ointed flexibility geometric non - linearity and shear forces in the connection deformations have been considered in and fixed - end forces are modified finally, a program for calculating semi - rigid with incremental - iterative method has been

    本文的目的就是為半剛性連接鋼框架的設計提供一種既符合工程實際又簡便易行的計算方法，供規范使用過程的補充、延伸或參考；同時，也將促進半剛性連接鋼框架設計技術的發展，為提高結構安全性能、節省工程成本發揮應有的作用。本文首先介紹了常見的幾種應用較為廣泛的樑柱連接彎矩轉角關系模型，在分析比較的基礎上，選用richard ? abbott函數模型作為外伸端板連接彎矩轉角關系模型，通過對34個外伸端板連接的實驗數據與回歸分析得到的參數比較可知，經回歸分析得到的此模型參數與實驗數據符合較好。然後用彈簧表徵連接點的轉動剛度，根據梁的轉角位移方程推導出半剛性連接的剛度矩陣，在單元剛度矩陣中考慮了節點柔性、幾何非線性和剪切變形的影響，並對固端力進行了修正，最後用增量迭代法編制有限元程序進行計算和分析。
  3. In this zone, the ocean wave fields are complex and variable due to the influences such as geological, bottomed, shoaling, ocean - engineering factors and currents in coastal zone etc. so the lattice ( multi - point ) situ - observation is not applied and is not practised based on the economical and practical consideration

    特別在長江口區海域，地質、底質、灘塗、海洋建築、航運以及徑流等諸多因素造成波浪場的復雜多變，如依靠多布點的現場觀測在效益上不可取，實際操作也是不可行的。
  4. Coordinated control system is a complicated multi - variable control system. it is valuable to study the coordinated control system for improving the automatic degree and security economical operation level of thermal power plant

    單元機組協調控制系統是一個復雜的多變量控制系統，研究單元機組協調控制系統，將有助於提高火電廠的自動化程度和安全經濟運行水平，因此有重要意義。
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