下載本文檔
版權(quán)說明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請進行舉報或認領(lǐng)
文檔簡介
1、 234 JOURNAL OF VIBRAT I ON AND S HOCK Vo. l 29 No . 6 2010 F luctua ting force of across2w ind a ct in g on rectangu lar super2ta ll bu ild ings . par tÑ : basic character istics 1 1 , 2 1 GU M ing , TA NG Yi , QUA N Yong ( 1. Sate Key Laboratory for D isaster R eduction in C ivil Eng ineer in
2、g , TongjiUn iversity , Shangha i 200092 , Ch ina ; 2. Ch ina Acade m y of Building R esea rch , Be ijing 100013, China Abstr act : The paper is the first part of the serial research works about across2 w in d forces actin g on rectangular super2ta ll bu ild ings. Seven rectangular super2tall bu ild
3、ing mode ls w ith d ifferent sid e ratios were tested w ith synchronous pressure measuring technique in a w in d tunne.l Basic characterist ic s of the across2 w in d flu ctuating force , in clud ing RMS force coefficients , power spectra l densities , vertical corre lation coeffic ients and coheren
4、ce f unctions of th e tall bu ild ings were investigated . The effects ofw ind exposure cond ition and side ratio of th e buildin gsp across2sect ion on the across2 w ind flu ctuat ing forces were also studied . The results indicate that the side ratio has the most effect on the across2 w ind fluctu
5、a2 t ing forces ; and the mechan isms of the across2 w ind fluctuating forces are possib ly d ifferent for the build in gsw ith d ifferen t sid e ratios. K ey w ords : super2tall bu ilding ; w ind tu nne l tes; t across2 w ind flu ctuat ing force ; RMS force coe fficien; t po wer spec2 tru m; orrela
6、t ion coeffic ient ( pp : 42- 45 , 104 F luctua ting force of across2w ind a ct in g on rectangu lar sup er2ta ll bu ild ings . par t Ò : m a th em a tica lm odel 1 , 2 1 1 TA NG Yi , GU M ing , QUA N Yong ( 1. Sate Key Laboratory for D isaster R eduction in C ivil Eng ineer ing , TongjiUn iver
7、sity , Shangha i 200092 , Ch ina ; 2. Ch ina Acade m y of Building R esea rch , Be ijing 100013, China Abstr act : The basic characterist ics of fluctuating w ind forces of across2 w in d act ing on rectangular super2ta ll build2 ings have been describ ed in P artÑ of the series of papers . In
8、present paper , m athematical model of flu ctuat ing w ind forces of across2 wind were investigated based on the results sho wn in PartÑ . U sing the nonlinear least2squaresm ethod , for m u la s for the RMS force coefficients , vert ica l correlat ions and po wer spectrum densities ( PSD s in
9、short were fitted as the func2 t ions of side ratio of bu ild ing cross2section and terrain category cond it ion. By co mpar ison w ith the orig in al test results , the prec ision of the present for m u las were fina lly verified . These formu las for the fluctuating w ind forces of across2 w ind c
10、ou ld be applied to w in d resistance design of rectangular super2tall bu ild ings. K ey w ord s : rectangular super2tall bu ild ing ; w ind tunnel tes; t across2 w in d flu ctuat ing force ; mathe m atica l model ( pp : 46- 49 R esea rch on flu id2structure interaction in flu id2filled p ipes LI Ya
11、n2hua , LIU Gong 2 m in , MA Jun 1 1 2 ( 1. College of Power and Energy Engineer ing , H arbin Engineering University , H arb in 150001, China ; 2. M ilitary R epresen tative O ffice a t F actory 431, Hu ludao 125004, China Abstr act : The mode ls of t w o k in ds of the most co mmon p ip e section
12、structures and the ir analyt ical solu t ions were stud ied . For straight p ip es , a ti m e2do ma in equation model consid ering flu id 2structure in teraction describ ed by part ial differenc ial equation was set up . A nd the equation was transferred into frequency do m ain by Laplace transfor m
13、 at ion, fro m which an analyt ica l solu tion was obtained . For curved p ip es, th e model was directly solved to get an overa ll solu t ion and also an analyt ic al solution was obtained . Then the single2bend p ip e model set up by Davidson was taken as an exa mp le to si m ply illustrate and ve
14、rify the solving method for the co mb in ed structure co mposed of th ese t w o pipe sect ions. F ina lly , the factors a ffecting the characteristics of flu id 2structure in teraction were analyzed by changing the bend radiu s and angle of curved pipe. The results sho w that the smaller the bend ra
15、dius and angle of curved pipe, the lo wer the density of the spec2 tru m d ia gram , sho w ing th e less severity of coup led vib ration . Vo. l 29 No . 6 2010 JOURNAL OF VIBRATI ON AND S HOCK 235 K ey w ord s : flu id2filled pipes ; fluid2structure in teraction ; frequency do m ain; transfer matr i
16、x ( pp : 50- 53 , 124 Num er ica l si m u la tion of com ponen t2dropp ing2collision Y A NG Yong 2qiang , LI Shuang , XIE Li2li 1 2 1 , 2 ( 1. Institu te of Enginee ringM echanics , China E arthquake Adm inistration, H arb in 150080, Ch ina ; 2. School of C ivil Engineer ing and A rch itec ture , H
17、arb in Institute of Technology , H arb in 150090, Ch ina Ab stract: In order to study the e ffect of co mponen t2dropp in g2collision on structura l response , the constra in t condi2 t ion on d isplacemen t i mposed by collision was derived and the dynam ic equat ion of collision system was establi
18、shed . The presented method , wh ich co mbines H ertz2da mp ing model w ith fin ite element m ethod , can account for the in flu ence of mass d istr ibution of co mponents as well as the non lin ear stiffness and the energy loss during collision process. E ffects of mass , mass distribution and drop
19、p ing height of co mponent were ana lyzed based on co mponent2dropp ing2collision mode.l The resu lts indicate that neglect ing mass d istr ibution of collision body w ill lead to overesti m ation of collision effects wh ile collision body is asy mmetric along th e collision surface nor m a.l The pe
20、ak of collision load and the durat ion of single colli2 sion are exponential functions ofmass and dropping height of co mponen, t and the larger the mass and th e higher th e drop2 pin g heigh, t the larger w ill be the peak of collis ion load , but the durat ion of sin gle collision beco m es longe
21、r w ith the in crease of mass and the decrease of dropp ing heigh. t These coclusions can provid e reference for reduction of collision damage . K ey words : loss co mponent2dropp ing2collision; H ertz2da mp ing mode;l mass d istribution; nonlin ear st iffness ; energy ( pp : 54- 58 App lying EM D d
22、ecom position of the V olterra m odel to extract m echan ica l fau lt featur e QIU Y an, WU Y a2 feng, LI Ye ( Northwestern Polytechn ica lUn ive rs ity , Xi pan 710072, Ch ina Ab stract: The V olterra model for chaotic ti m e series prediction was in troduced intom ach in ery fault d ia gnosis . Th
23、e EMD and Volterra forecast parameters co mb in ed with sin gular value deco mposit ion m eth od were pu t in use to extract the character is tics of mechan ica l fa ilure . The method is superior to th e traditiona l feature extraction methods, o w in g to its obvious advantage of calcu lating si m
24、 plicity in characteristics detection . The si m ulations and actua l tests sho w the effective2 ness of the method proposed in mechan ica l fault featu re extraction. The method can effectively extract the character istics of mechanical failu re. K ey w ord s : Volterra mode;l fault feature ; EMD ( pp : 59- 61 , 128 N onlinear stocha stic response of tran s m ission tow er2line system under strong w ind WA NG D a 2ha i, LI J ie ( School of C ivil Engineer ing , TongjiUniversity , Shanghai 200092, C
溫馨提示
- 1. 本站所有資源如無特殊說明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請下載最新的WinRAR軟件解壓。
- 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
- 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁內(nèi)容里面會有圖紙預(yù)覽,若沒有圖紙預(yù)覽就沒有圖紙。
- 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
- 5. 人人文庫網(wǎng)僅提供信息存儲空間,僅對用戶上傳內(nèi)容的表現(xiàn)方式做保護處理,對用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對任何下載內(nèi)容負責(zé)。
- 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請與我們聯(lián)系,我們立即糾正。
- 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時也不承擔(dān)用戶因使用這些下載資源對自己和他人造成任何形式的傷害或損失。
最新文檔
- 豬肉供貨協(xié)議合同模板
- 裝修合同模板有收款帳戶
- 網(wǎng)絡(luò)平臺設(shè)計合同模板
- 房屋租賃合同模板 - 法
- 墻體打孔合同模板
- 樣查詢購房合同模板
- 耗材倉庫采購合同模板
- 倉儲協(xié)議合同模板簡短模板
- 超市包場合同模板
- 代辦工商注冊合同模板
- 園林灌木怎樣修剪
- 2023全國青少年文化遺產(chǎn)知識大賽試題及答案(第1201-1270題)
- SWITCH暗黑破壞神3超級金手指修改 版本號:2.7.7.92380
- 7.4.1二項分布教學(xué)設(shè)計-高二下學(xué)期數(shù)學(xué)人教A版2019選擇性
- 雪茄品牌培訓(xùn)課件
- 內(nèi)固定取出術(shù)護理查房課件
- 韓語發(fā)音課件
- 2021年中國中車公司組織架構(gòu)和部門職能
- 低氧血癥的護理課件
- 工程設(shè)計資質(zhì)專業(yè)人員專業(yè)對照表
- JTS-T 150-2022 水運工程節(jié)能設(shè)計規(guī)范
評論
0/150
提交評論