數(shù)據(jù)庫技術(shù)在船舯結(jié)構(gòu)設(shè)計(jì)中的應(yīng)用.pdf

1、摘要／船舯所受彎矩最大，是全船結(jié)構(gòu)主要矛盾之所在，組成了船體結(jié)構(gòu)酌全局性構(gòu)想，因而是船舶設(shè)計(jì)的重中之重。舯部結(jié)構(gòu)設(shè)計(jì)還是船體其他結(jié)構(gòu)設(shè)計(jì)的原則依據(jù)，必須嚴(yán)肅地對(duì)待。在進(jìn)行舯部結(jié)構(gòu)設(shè)計(jì)時(shí)，繪圖工作與計(jì)算工作～般是交叉進(jìn)行的；而且，隨著結(jié)構(gòu)設(shè)計(jì)階段的發(fā)展，局部性結(jié)構(gòu)設(shè)計(jì)不斷深化，舯部結(jié)構(gòu)的計(jì)算和圖紙的繪制均不免要反復(fù)加以修改，直到彼此能相互準(zhǔn)確呼應(yīng)。正是由于有了大量的反復(fù)工作，那么就給設(shè)汁人員帶來了很多不便。特別是在手工設(shè)計(jì)為主的時(shí)期，浪費(fèi)

2、了大量的人力物力。即便是在今天，計(jì)算機(jī)繪圖已經(jīng)全面取代了手工繪圖，但這種情況仍未得到有效的改變。這是因?yàn)樵诖蠖鄶?shù)設(shè)計(jì)或建造單位，微機(jī)的應(yīng)用僅僅限于“電子圖板”，麗那些與幾何元素相關(guān)的信息需用另一套系統(tǒng)來保存，即圖形與數(shù)據(jù)的分割。設(shè)計(jì)的大量工作仍是“以人為本”，未能充分發(fā)揮計(jì)算機(jī)的強(qiáng)大功能。本人注意到現(xiàn)今國(guó)內(nèi)外對(duì)船舯結(jié)構(gòu)設(shè)計(jì)的研究多集中在初步設(shè)計(jì)上，即定出舯剖面的框架；而在局部設(shè)計(jì)中卻鮮有作為。但事實(shí)上，在對(duì)舯部結(jié)構(gòu)進(jìn)行設(shè)計(jì)時(shí)，大量的精力

3、是被耗費(fèi)在反復(fù)的修改之中。出于圖形與數(shù)據(jù)被分割保存，在修改時(shí)構(gòu)件間的約束關(guān)系無以即使是細(xì)微的修改也會(huì)導(dǎo)致大規(guī)模的改動(dòng)。針對(duì)這～文的研究重心被定在了如何將圖形與數(shù)據(jù)相連，實(shí)現(xiàn)兩動(dòng)?！妒聦?shí)上是一種參數(shù)化的思想，關(guān)鍵在于如何實(shí)現(xiàn)經(jīng)過反復(fù)研究，最后決定用SQLServer數(shù)據(jù)庫來存儲(chǔ)有關(guān)數(shù)據(jù)，用VB開發(fā)一個(gè)數(shù)據(jù)庫管理系統(tǒng)，并在該系統(tǒng)中對(duì)AutocAD2000進(jìn)行二次開發(fā)實(shí)現(xiàn)圖形與數(shù)據(jù)的聯(lián)動(dòng)?！鸨敬窝芯坑袃蓚€(gè)重點(diǎn)，也是難點(diǎn)。一是如何設(shè)計(jì)一個(gè)數(shù)據(jù)

4、庫，使其能夠恰到好處地反映船舶的舯部結(jié)構(gòu)；簡(jiǎn)而言之，也就是研究舯剖面圖的數(shù)據(jù)結(jié)構(gòu)。另一個(gè)難點(diǎn)是利用vB丌發(fā)～個(gè)數(shù)據(jù)庫管理所論互。；本的法尋、0／問想找實(shí)之一法現(xiàn)者這AbstractMidshipsectiondesignisavitalstepamongship’sdesignThissectionendul‘eslnostbendillgload，andmateriaIizesthestructureofthewh0IeshipThe

5、refbre，theworkinthispartmustbetreatedseriouslyandparticularIyDuringtheprocessofthemidshipsectiondesign，drawingandcalculatingarecarriedthroughcrossly；moreoVer，、viththedeVelopmentofthisstep，designofdetailedstructureswouldb

6、edeepenedcontinuouslySodrawingandcaicu】a“ngofthenlidshipstructuremustbemodificatedagainandagain，un“l(fā)theperfectconsistencebetweenthedataandgraphisrealizedBecauseofsuchagreatdealofreiteration，designershavetodealwithmanyunn

7、ecessarytroubIesThereby，amassofmanpowerandmate“alresoLlrcesarewastedinthisstepEvenattoday，whenconlputeraideddrawinghasreplacednlanueldrawingentirely，thisconditionstilldoesn’tbechangedeffectiVelyThereasonisthatinthemostof

8、designingandconstructingun“s，computerisonlylookeduponasan“electricboard，”nearlyalloftheinformationrelatedtothegeOmetriceIementsmustbesavedbyanothersystemThatmeansdataandgrapharedividedcompletelyAuthornoticedthatthesedays

9、，manyresearchesaboutthedesignofnljdshjpsectjonarefbcusedonthescant“ngofthecomponentinthepre“minarydesignphaseHowever，thedetaildesignis“ignored’’bymostofresearchersInfact，agreatdeaIofenergyareusedintherepeatingmodiflcatio

10、nsBecausethedataandgrapharekeptrespectiVely，itisverydifnculttofindthegeometlictopologyanddimensionrestraininformationbetweenthecomponentsThen，thedirectresultisthatevenaspecificmodiflcationwouldleadtoalargescalechangeAime

11、datthepraxis，inthispaper，thecenter—gravityofresearchisplacedonhowtolinkthedataandgraphActually，itisakindofparametricidea，butthekeyishOwtealizeditAfterlaboriousresearch，AuthordecidedtochooseSOLServer70(thedatabase)tokeepa