In this thesis , the studies emphasize on optimization of concurrency control algor ithms for real - time database systems 針對這些資源浪費問題,本文著重研究了實時事務并發(fā)控制算法的優(yōu)化問題。
Paper gives out an algorithm for seeking the set of intersection intervals . by it , the i - collede algor ithm is reduced to o ( nlogn ) 其中,提出了一種求相交線段集的算法,把原i ? collde算法時間復雜度降為o ( nlogn ) 。
In order to coordinate internal force calculation in algor feas , the preceding processing program and post processing program are worked out 為了配合algorfeas的內(nèi)力計算,本文還用visualbasic編制了前處理程序和后處理程序。
At the mean time , algor , a famous fea program , is used to verify the results obtained by the program compiled . the results are proved to be correct 同時,學習了大型有限元程序algor ,用它分析了前述研究的箱梁,并把結(jié)果與自編程序計算的結(jié)果進行了比較,表明編制的程序計算的結(jié)果是正確的。
In this paper , the practical model for calculation torsion is set up in algor feas , which is 3 - d girder element model with rigid arms . the model is better used to calculate the effect of deviation load 本文在algorfeas中建立了一種計及扭轉(zhuǎn)的實用模型?帶剛臂的三維梁單元模型,用此模型能較好地計及荷載偏載效應。
Using large - scale current finite element software algor , the author builds 3d finite element models for the five project , and analyzes flexural , temperature deform and natural frequencies of the five guideway girder projects 運用大型通用有限元分析軟件algor ,對五種可能軌道梁結(jié)構(gòu)方案建立有限元空間分析模型,進行撓度、溫度變形及自振特性的對比分析。
In order to ascertain the character of cable - replaced bridge , in addition , the thesis calculates mode shapes and natural frequencies of the bridge using algor software and estimates the result of dynamic load test and calculation in details 為了評價換索后橋梁的工作特性,最后利用algor軟件對換索后的結(jié)構(gòu)進行了振型和自振頻率分析,并對動載試驗檢測和計算成果作了詳盡的分析和評價。
With the help of the electronic computers , engineers employ it to figure out nearly all kinds of engineering problems ranging from astronavigation , construction , waterpower projects , ship - building and mechanical engineering etc . owing to the strong power of finite element method , one kind of software pack which based on the method is exploited and named algor feas to resolve problems on structure analysis for trusses and shells . this paper also employ algor feas software pack to analyze and compute the cableway towers , giving the accurate result on stress and displacement both in location and whole . finally , we also bring out some advice on structure improving 在此分析過程中:首先將物理模型簡化為力學模型,主要是將塔架結(jié)構(gòu)按空間桿單元簡化為空間桁架結(jié)構(gòu),目的是將力學模型變換為數(shù)學模型;這一過程主要是利用autocad2000建立塔架的計算模型;再者,利用algorfeas軟件包讀入autocad建立的塔架計算模型生成初始數(shù)據(jù)卡利用計算機進行編程進行風載計算,再將計算結(jié)論整合入algorfeas產(chǎn)生的初始數(shù)據(jù)卡中,生成計算數(shù)據(jù)卡;接著,利用algorfeas軟件包計算塔架在不同載荷情況下的應力圖,位移圖,并且求出在不同載荷條件下的最大位移和最大應力等;然后,對塔架的穩(wěn)定性進行分析;最后;根據(jù)計算結(jié)果提出改進建議。
In this paper , the geogrids structure , the flexible beams strucrure , the geogrids and flexible beams structure are analysed with algor , and it is used to analys the influence of some paramenters . such as the modulus of structural layers , size of structure , place of structure , non - uniform settlements . and the contrast of the three structures is analysed in this paper . we can see the reasonable size and reasonable place through analyse . the analyse of the test road show that the structures worked well for about two years and the reflection cracks have not be found 本文首先借助algor有限元軟件對土工格柵處治結(jié)構(gòu)、柔性枕梁處治結(jié)構(gòu)及土工格柵與柔性枕梁復合結(jié)構(gòu)進行了力學分析,包括各結(jié)構(gòu)層模量影響規(guī)律分析,格柵及枕梁尺寸、位置影響規(guī)律分析,路基不均勻變形影響規(guī)律分析,各種處治結(jié)構(gòu)間的對比分析等。通過分析,得出了各結(jié)構(gòu)的合理尺寸及合理的布設(shè)方案。
In this paper , a high performance sma system applied to steel bridge deck is put forth in allusion to the pavement project of the wuhan junshan yangtze river highway bridge . it comprises steel slab , zn coating layer , closing layer , adhesive , pre - mixed asphalt stone and dual layer sma from bottom to top . it is based on the fea results of the forces and deformation of the pavement layer by means of the algor feas , according to this bridge ' s traffic and the ambient temperature varying range of the pavement layer 本文針對武漢軍山長江公路大橋鋼箱梁橋面鋪裝工程,從鋪裝層環(huán)境溫度變化范圍、交通量等使用條件出發(fā),在用algorfeas有限元分析軟件分析鋪裝層受力變形基礎(chǔ)上,提出了(即鋼板+金屬鋅涂層+封閉層+粘接劑+預拌瀝青碎石+雙層sma )的高性能鋼橋面sma鋪裝體系,并對這種sma的組成材料,包括改性瀝青、集料、礦粉、纖維進行了比較研究,設(shè)計了這種sma的配合比,對sma混合料的性能進行了對比試驗,對這種sma方案進行了疲勞性能研究,驗證了所選擇sma方案的可行性。