時變系數 的英文怎麼說
中文拼音 [shíbiànxìshǔ]
時變系數
英文
time-varying coefficient-
Theoretical analysis and computer simulation studies show that performance comparable to that of electro - control active damping suspension systems can be achieved with the hydraulic network model which can self - adaptingly adjust the damping of suspension to realize the optimal control by virtue of response of vehicle. in chapter 5, the effects of time - variant factors in the new active damping suspension system on reduction are investigated
第五章研究了主動阻尼系統中的時變因數對減振系統的減振效果的影響（包括路況、車速、載重阻尼油的粘度系數隨油溫變化而引起的變化，油液的彈性模量等） ，並分析了模型簡化時一些被忽略的非線性因數對系統性能的影響。Creep analysis methods of high - rise buildings and large span buildings can only refer to creep coefficient method in bridge engineering or the method of degree of creep in hydraulic construction engineering under the present experiment conditions. in this paper, the incremental expressions of concrete creep and shrinkage strain when the initial computational age is not the same as the loading age are derived and corrected from the concept of concrete creep coefficient and the mean value theorem of integral and the principle of superposition. the differences of efficiency and accuracy of creep analysis between the finite element method with creep coefficient and the initial stress method with degree of creep are presented. this paper suggests that engineers should use the initial stress method with degree of creep to estimate the influences of creep on high - rise buildings and large span buildings on the basis of conceptual design
基於現有的試驗資料，高層及大跨度民用建築的徐變分析只能參照橋梁結構中的徐變系數方法或水工結構中的徐變度方法進行.從徐變系數的定義出發，利用積分中值定理和疊加原理，推導並修正了加載齡期與起算齡期不同時徐變收縮應變增量的表達式，對比了應用徐變系數分析徐變的有限元法和應用徐變度分析徐變的初應變法在效率和精度上的差別，並建議應從概念設計的角度出發，採用徐變度的初應變法來估算徐變對高層及大跨度民用建築的影響Abstract : creep analysis methods of high - rise buildings and large span buildings can only refer to creep coefficient method in bridge engineering or the method of degree of creep in hydraulic construction engineering under the present experiment conditions. in this paper, the incremental expressions of concrete creep and shrinkage strain when the initial computational age is not the same as the loading age are derived and corrected from the concept of concrete creep coefficient and the mean value theorem of integral and the principle of superposition. the differences of efficiency and accuracy of creep analysis between the finite element method with creep coefficient and the initial stress method with degree of creep are presented. this paper suggests that engineers should use the initial stress method with degree of creep to estimate the influences of creep on high - rise buildings and large span buildings on the basis of conceptual design
文摘:基於現有的試驗資料，高層及大跨度民用建築的徐變分析只能參照橋梁結構中的徐變系數方法或水工結構中的徐變度方法進行.從徐變系數的定義出發，利用積分中值定理和疊加原理，推導並修正了加載齡期與起算齡期不同時徐變收縮應變增量的表達式，對比了應用徐變系數分析徐變的有限元法和應用徐變度分析徐變的初應變法在效率和精度上的差別，並建議應從概念設計的角度出發，採用徐變度的初應變法來估算徐變對高層及大跨度民用建築的影響Identification of time - varying modal parameters by a linear time - frequency method
應用時頻分析方法辨識時變系統的模態參數The transverse stiffness limitation index ? the permissible ultimate width / span ratio b / l of the continuous steel truss girder of railway bridge is analyzed in accordance with the analytic theories of random vibration of train ? bridge time - variation system and the required derailment coefficients and comfort of drivers and passengers in train running through the bridge. the limitation index in question may be referred to in the design of the continuous steel truss girders of railway bridges
基於列車-橋梁時變系統隨機振動分析理論，按照橋上列車脫軌安全系數和司機、旅客舒適度的要求，對鐵路連續鋼桁梁橋橫向剛度限值-橋梁容許極限寬跨比b / l進行了分析，對鐵路連續鋼桁梁橋的設計具有一定的參考作用。Abstract : the design problem of reduced - order state observer for a class of multi - input multi - output ( mimo ) nonlinear time - varying systems is studied in this paper. a new design method of nonlinear reduced - order state observer is proposed, and the exponential convergence is proved for the proposed state observer. the observer has the characteristics of that the speed of convergence is adjustable. finally, an example is given to show that this approach is effective
文摘:研究一類多輸入多輸出（ mimo ）非線性時變系統的降維狀態觀測器設計問題.提出一種非線性降維狀態觀測器設計方案，並從理論上證明了狀態觀測誤差的指數收斂性.其中設計的降維狀態觀測器具有收斂速度可調的特性.最後給出了數值算例，模擬結果表明了本文方法的有效性Cubic spline functions polynomial are used directly to approximate the time - varying coefficients
利用三次樣條基函數多項式逼近時變系數，將時變參數的佑計轉化為定常參數的估計。The 1st time coefficient shows the staged feature of the progression of the moisture transport over asian - australian monsoon region, which relates with the large - scale important weather incidents in asian - australian monsoon region. iv
第一特徵向量對應的時間系數圖表現了亞澳季風區4 - 9月份的水汽輸送階段性的時間演變特徵，可反映夏季亞澳季風區的大型天氣事件的發生變化過程。Based on the complex nonlinear system theory and contraposing the nonlinear time - dependent characteristic of complex economic system, this dissertation researches the structure, stability, equilibrium trajectory bifurcation and trajectory catastrophe phenomenon of evolution, the characteristics of the equilibrium catastrophe trajectory which is caused by parameters
以復雜非線性系統的理論為基礎，圍繞復雜經濟系統的非線性時變特點，對非線性時變系統的結構、穩定性、演化過程中平衡軌道分岔現象和參數引起的軌跡突變現象進行了理論研究，研究了突變軌跡的相關性質。There are lots of non - linear systems in the nature. because classical and morden control methods have common limitation : mathematical model of the plant has to be known in advance. but in fact many plants are intricate uncentaintied and time - varying. in addition, they also are non - linear. though there are methods of system identification in control theories, the identification theories and ways of non - linear and time - varying system are not mature and systematic. it is very difficult to carry out effective real - time control. the neural networks can approximate random non - linear relations and study by itself, and it provides new thoughts and new ways for solving these problems
由於經典和現代控制方法存在一個共同的局限性：就是要求預先知道被控對象的數學模型，但實際上許多對象具有復雜的不確定性和時變性；此外還具有復雜的非線性。雖然在控制理論中有系統辨識的手段，但是對于非線性時變系統尚無成熟的和系統的辨識理論與方法，要實行有效的實時控制就很難了。人工神經元網路有表示任意非線性關系和自學習等能力，給解決這些問題提供了新思想和新方法。Secondly, overcoming drawback of single variable fitting ar models lacking of other variables acting on factor variable, a set of the trace formulas are given about the time - change coefficient matrixes of multivariable fitting ar models
2應用逐段線性化的方法推導出了多維ar （ r ）自適應模型時變系數矩陣的遞推公式，克服了單變量ar （ r ）自適應模型沒有考慮其他變元對因變元的作用的缺陷。Numerical resultsdemonstrate the accuracy and the validity of the proposed method for identificationthe parameters of lti system and smoothly, periodically and abruptly time - varyingparameters of ltv system
對線性時不變系統和線性時變系統在參數連續平滑變化、周期變化、突變的情形下進行模擬驗證。Robust control of a class of nonlinear system with time - varying parametric uncertainties
一類具有時變參數不確定非線性系統的魯棒控制This paper lays emphasis on the research of internal connection of various time varying parameter identification methods
摘要本文重點研究了現有各種時變參數識別方法的內在聯系及各自特點。The paper consists of several parts as following : firstly, we probe an estimating method with the time - change parameters to overcome the problem with greater errors that us think a dynamical process with the time - change parameters as a static process with the no time - change parameters and forecast the time - change parameters system by the model with the no time - change parameters
本文主要進行了以下幾方面的工作： 1探討了一種動態系統的時變參數的估計方法，克服了以往把一個時變參數的動態過程當作了非時變參數的靜態過程，而用非時變參數模型預報時變參數系統的狀態時帶來的較大誤差問題。Due to the fact that joint position errors decrease when the jerk decreases, comparisons with an alternative global optimum target relating to minimum - jerk ( mj ) trajectory are exposed and the favorable joint trajectories are obtained by introducing a factor
考慮到加速度變化率對路徑跟蹤的影響，比較與加速度變化率相關的不同的優化目標函數時的路徑跟蹤性能，提出引入一個時間系數來修正運動總時間，獲得跟蹤性能良好的關節軌跡。The variational trait of the first temporal coefficient is that the coefficient is often positive in 1960s, often negative in 1970s, the break point often happen in 1960s and 1970s, especialy 1970s ; the fluctuate of the second temporal coefficient of year. spring and autumn appears little change, but appears much change of summer and winter, the break point often happen in 1980s and 1990s, specially 1980s ; the change trend of the third temporal coefficient is not obvious during 1961 to 2000, only appears clear raise in the anaphase 1990s ; it is difficult to detail the positive and negative trend of the fourth temporal coefficient, the situation of the coefficient appears alternant change of positive value and negative value, the break points happen concentratively in 1990s, the situation of the fifth temporal coefficient is like the fourth ' s ; the alternate of positive value and negative value of the sixth temporal coefficient is obvious, then the negative trend take advantage after 1990s, the distribution of the break point is even, but most of them still in 1990s ; the break points happen many times, but it is limited that the break points attain 0. 05 significance test
第一時間系數變化大體有如下特點：對年和季節來說， 60年代系數多表現為正值， 70年代多表現為負值，突變點多發生於60 、 70年代，特別是60年代；第二時間系數在年、春季、秋季表現為波動很小，夏季和冬季則很大，突變點多發生於80 、 90年代，特別是80年代；第三時間系數正負變化趨勢不明顯，只是90年代後期在年和夏季降水中升高明顯；第四時間系數基本無明顯正負趨勢可言，只是正負交替出現，突變點集中出現在90年代；同第四時間系數相似，第五時間系數亦無明顯正負趨勢，突變點多出現在90年代；第六時間系數正負交替明顯，進入叨年代后負趨勢為主，突變點分佈較均勻，但仍以904atvjz多；突變點出良多，但突變區域艾擇no 05 ggrr著性以上的卻有限。The mach number control system need more sub - system to correspond working, which is th a typical more input and one output system
該風洞馬赫數控制在不同的工況下需要多個子系統協調完成，是一個典型多輸入單輸出，非線性時變系統。Based on an algorithm for solving the time - dependent coefficients nonlinear differential equations numerically, computer software is developed which has an easy - to - use interface. the dynamic response to elastic deformation and stress in key parts and forces acting on the bearings under various parameters and working conditions can be calculated
在研究求解該時變系數非線性微分方程組數值解法的基礎上，開發了具有良好人機界面的模擬軟體，可以計算出多種參數和工況條件下關鍵點的彈性位移、應力和運動副反力的變化規律。This thesis has made the contrast test of shrink and creep for plain concrete and concrete filled steel tubes on the basis of long term in - door test, obtains the principles of shrink - creep of concrete filled steel tube, simulates the test data, analyses and contrasts the coefficient of shrink and creep, thus offers reference for the calculation mode of creep, furthermore by introducing reasonable assuming at the same time, develops the calculation formula of equivalent elastic modulus at the same time, develops the calculation formula of equivalent elastic modulus, adopts common structure analyses procedure ansys to calculate the redistribution of section stress in the steel tube and concrete during operation
本文在長期的室內試驗的基礎上對素混凝土和鋼管混凝土做了收縮和徐變的對比試驗，得出鋼管混凝土的收縮徐變規律，對試驗數據進行了擬合，對鋼管混凝土的收縮和徐變系數進行了分析和比較，從而為鋼管混凝土的徐變計算模式提供參考，同時通過引入合理的假定，並結合由「齡期調整有效模量法」導出的混凝土徐變本構關系，推導出了鋼管核心混凝土考慮徐變影響后的等效彈性模量計算公式，並以此為基礎採用通用結構分析程序ansys對成橋后鋼管和混凝土應力重分佈進行了計算。分享友人