Numerical analyses of the allowed parametrical errors in tunable opo 參量允差的數(shù)值分析
Dynamical analysis of coupled oscillators with parametrical excitation 參數(shù)激勵(lì)耦合系統(tǒng)的復(fù)雜動(dòng)力學(xué)行為分析
Finally , parametrical uncertainty is studied to show that the controllers are robust 結(jié)果顯示,控制器具有較強(qiáng)的魯棒性。
An entire analysis on the closed loop system with the controller is presented , including stability analysis , response analysis , parametrical uncertainty analysis , and so on 最后對(duì)開(kāi)環(huán)系統(tǒng)及控制器作用下的閉環(huán)系統(tǒng)分別作了一個(gè)全面的分析,包括穩(wěn)定性分析、響應(yīng)分析等。
The conventional real - time monitoring method does not use the non - parametrical pdf of the principal components , which are capable of indicating the real - time changes of batch production processes 本文從這一背景出發(fā),重點(diǎn)是對(duì)用核函數(shù)法概率估計(jì)對(duì)間歇生產(chǎn)過(guò)程實(shí)時(shí)狀態(tài)監(jiān)測(cè)的方法進(jìn)行較廣泛、深入的研究。
( 3 ) profoundly developed the technical tools and apdl ( ansys parametrical design language ) of the ansys software based on the optimum design practice , and realized the aim of constructing the complicated parametrical fe model ( 3 )結(jié)合優(yōu)化設(shè)計(jì)工作實(shí)踐,深入挖掘開(kāi)發(fā)了ansys軟件所提供的技術(shù)工具和apdl語(yǔ)言,實(shí)現(xiàn)了復(fù)雜的參數(shù)化有限元建模。
The mostly aims of the thesis are developed the gravity dam parametrical model system . the system can automatic cut open for model and can export model to the universal finite element analysis ' software to calculate . finally , the author discuss in the place drawing 本文的主要目的在于建立重力壩的數(shù)字化三維模型系統(tǒng),并能夠在此基礎(chǔ)上對(duì)三維模型進(jìn)行自動(dòng)剖分,并導(dǎo)入通用有限元軟件進(jìn)行有限元計(jì)算,而且向二維施工圖的方向進(jìn)行了試探。
Following problems are mainly discussed in this work : how to build a parametrical finite element ( fe ) model how to choose the design parameters , constraints and objective of the correction model how to evaluate different sensitivity calculating methods and choose optimization algorithms how to get the normal mode - shapes and describe the relativity between normal mode - shapes how to solve the correction problem of fe model by using structure optimization techniques in each paragraph , illustrative examples are used to explain the methods and finally an engineering application of an aircraft correction is presented in the end 主要進(jìn)行了如下幾個(gè)方面的工作:參數(shù)化有限元模型的建立;修正模型設(shè)計(jì)參數(shù)、約束及目標(biāo)函數(shù)的確定;靈敏度方法的比較及優(yōu)化算法的選取;固有振型的獲取及模態(tài)相關(guān)性的定量描述;采用結(jié)構(gòu)優(yōu)化技術(shù)解決有限元模型修正問(wèn)題。在模態(tài)修正過(guò)程中,由于修正固有振型涉及大量的有限元計(jì)算結(jié)果數(shù)據(jù),此前,雖有不少文獻(xiàn)在理論上研究了它的修正方法,但都沒(méi)有給出工程應(yīng)用實(shí)例,而本文解決了固有振型修正的工程應(yīng)用問(wèn)題。
Since it is difficult for the cable or beam model to consider the large deformation in the pipe crossing section , the fem analysis with shell element has been proposed to investigate the response of pipe . takada ( 2000 ) proposed a simplified design formula to obtaining the maximum strain in steel pipes based on the parametrical study using a beam - shell hybrid fem 現(xiàn)在的抗震規(guī)范和有關(guān)研究中,還很少有估計(jì)大變形時(shí)管子內(nèi)的應(yīng)力應(yīng)變的方法,雖然2000年高田至郎等人基于殼有限元模型的參數(shù)研究提出了設(shè)計(jì)用的簡(jiǎn)化計(jì)算公式,但在他們的分析模型中存在一些問(wèn)題有待改進(jìn)。