Thirdly , to improve the application of light gauge steel structure in our country , some experimentations of institute of new - style steel structure which adopting native productions are induced nally , three - dimensional finite element model is presented . compared with the tests , mumerical results are verified much accurate and efficient , therefore a reliable way is provided to utilize the computational technique adequately to reduce the tests and to utilize the experimental results adequately to improve design quality , ( 3 ) study on floor system . not only adequate strength , stiffness and integer stabilization must be provided , but also insulation , fire and acoustics must be satified 本文首先論述了lgsfcbw各種破壞模式及其原因,總結(jié)了各因素對(duì)lgsfcbw抗剪性能的影響,從而為我國(guó)引進(jìn)和應(yīng)用輕鋼龍骨結(jié)構(gòu)體系奠定了基礎(chǔ);其次從試驗(yàn)?zāi)P汀⒃囼?yàn)方法和試驗(yàn)結(jié)果三方面探討了國(guó)外lgsfcbw抗震性能的研究,并分析該體系的破壞模式和抗震特性、提出研究建議;然后介紹了為推動(dòng)輕鋼龍骨住宅國(guó)產(chǎn)化,我們采用國(guó)產(chǎn)材料開(kāi)展的系列試驗(yàn);最后提出了lgsfcbw的有限單元分析法,數(shù)值計(jì)算與試驗(yàn)結(jié)果一致,為充分利用計(jì)算技術(shù)減少試驗(yàn)數(shù)量和充分利用試驗(yàn)成果提高設(shè)計(jì)水平提供了一條可靠途徑。
Abstract : two computational techniques for inverse fight dynamics , namely derivation - iteration and integration - iteration techniques , are investigated . the application of inverse dynamics to determine control power requirements for post - stall maneuvering is researched , and a maneuvering flight trajectory based algorithm is provided , which lays a numerical foundation for simplifying design criteria for post - stall aircraft . with the model of inverse dynamics employed , a flight control mode for the outermost loop of the control system , named maneuver generator , is designed to follow desired complicated maneuvering flight trajectories . an example of rapid heading - reversal maneuver and other numerical simulations show the feasibility of the algorithm and the design idea 文摘:考察了求解輸入類(lèi)飛行逆動(dòng)力學(xué)問(wèn)題的微分-迭代與積分-迭代算法;探討了利用逆動(dòng)力學(xué)確定過(guò)失速機(jī)動(dòng)操縱效能要求問(wèn)題,這構(gòu)成了進(jìn)一步提出過(guò)失速機(jī)動(dòng)飛機(jī)設(shè)計(jì)簡(jiǎn)化判據(jù)的數(shù)值基礎(chǔ);利用逆動(dòng)力學(xué)設(shè)計(jì)機(jī)動(dòng)發(fā)生模塊進(jìn)行飛控系統(tǒng)的最外環(huán)控制,以便跟蹤期望的復(fù)雜機(jī)動(dòng)軌跡.飛機(jī)最速反向示例及其它數(shù)值仿真結(jié)果表明設(shè)計(jì)思想與算法是可行的
Data mining is defined as the nontrivial extraction of implicit , previously unknown , and potentially useful information from data or known as knowledge - discovery in databases ( kdd ) . to do this , data mining uses computational techniques from statistics , machine learning and pattern recognition such as discriminate analysis , regression method , mathematical programming , decision tree , k - nearest neighbor , artificial neural network etc . although many positive attempts are done , the development and application of personal credit assessment model in chinese bank industry is still in its infancy 數(shù)據(jù)挖掘是20世紀(jì)90年代后期人工智能和數(shù)據(jù)庫(kù)領(lǐng)域興起的一種數(shù)據(jù)處理和知識(shí)發(fā)現(xiàn)( kdd )理論,是從大量的、不完全的、有噪聲的、模糊的和隨機(jī)的實(shí)際應(yīng)用數(shù)據(jù)中,提取隱含在其中的信息和知識(shí)的過(guò)程。對(duì)數(shù)據(jù)進(jìn)行分類(lèi)和預(yù)測(cè)是數(shù)據(jù)挖掘的主要功能。數(shù)據(jù)挖掘用于信用評(píng)估的優(yōu)勢(shì)主要在于: ( 1 )能處理和修正實(shí)際數(shù)據(jù)問(wèn)題,算法模型具有自檢