boom n. 1.(雷、炮等的)隆隆聲,轟轟聲,(波浪的)澎湃聲;(鼓等的)咚咚聲;(蜂等的)嗡嗡聲;(鷺鷥等的)鳴叫;有回響的聲音。 2.(市面的)忽然興旺,景氣,繁榮,勃興;(候選人等的)突然大得人心[出名];(形勢(shì)的)突然好轉(zhuǎn);(城市等的)急速發(fā)展;(物價(jià)等的)暴漲;(人口等的)激增。 the war boom 戰(zhàn)爭(zhēng)景氣。 a building boom 建筑業(yè)的興旺。 vi. 1.(雷等)隆隆響;(波浪聲)澎湃;(鼓等)咚咚地響;(蜂聲)嗡嗡;(鷺鷥等)鳴叫。 2.(市面等)突然興隆,繁榮;(物價(jià)等)暴漲;(人口等)激增;(城市等)急速發(fā)展;(形勢(shì)等)突然好轉(zhuǎn);(候選人等)突然得人心[出名]。 Guns are booming. 炮聲隆隆。 Not far off the Pacific boomed. 不遠(yuǎn)處,太平洋的濤聲轟鳴。 vt. 1.用隆隆聲發(fā)出。 2.(用廣告等)推廣銷(xiāo)路;捧(候選人等)。 3.使迅速發(fā)展,使興旺。 He boomed out the verse. 他用低沉的聲音朗讀詩(shī)句。 adj. 〔美國(guó)〕猛漲起來(lái)的,忽然發(fā)展[興旺]起來(lái)的。 boom prices 猛漲起來(lái)的物價(jià)。 n. 1.【造船】帆的下桁,帆遄,橫杠,吊桿;懸[轉(zhuǎn)、起重]臂。 2.橫江鐵索,(港口的)水柵,柵欄;水上航標(biāo);【林業(yè)】筏堰。 vt. (以下桁)張開(kāi)帆腳。 vi. (船)以最高速航行。 boom nets 【軍事】柵欄撳〔戰(zhàn)時(shí)港口的水底鐵絲網(wǎng)〕。 heavy boom 重吊杠。 lower the boom on 〔口語(yǔ)〕 1. 禁止。 2. 嚴(yán)懲。
This paper is focussed on the deployable boom system ( dbs ) of geospace double star exploration project ( dsp ) of chinese accademy of sciences . the main content of the paper is as following : 1 針對(duì)中國(guó)科學(xué)院“地球空間雙星探測(cè)計(jì)劃”的有效載荷探頭伸展機(jī)構(gòu),本文進(jìn)行了機(jī)構(gòu)動(dòng)力學(xué)和結(jié)構(gòu)動(dòng)力學(xué)的理論分析和研究,主要內(nèi)容如下:1
This paper gives out the theoretic bases of the deploying kinematic analysis of dbs, and based on the deploying principle of deployable booms, this paper derives an analytical model of deployable booms for dsp . considering the topology of the boom systems, this paper discussed the dbs's two placements on the satellite and two corresponding movements for the booms . in this paper, such two movements are discussed in depths, and digital simulations have been made to check the probability 本文給出了伸桿機(jī)構(gòu)展開(kāi)運(yùn)動(dòng)學(xué)分析的理論依據(jù),從伸桿機(jī)構(gòu)展開(kāi)原理出發(fā),建立了雙星伸桿機(jī)構(gòu)展開(kāi)運(yùn)動(dòng)學(xué)模型,根據(jù)雙星伸桿總體設(shè)計(jì)方案,分析了伸桿在星上的兩種主要布置方式并做了相應(yīng)的展開(kāi)運(yùn)動(dòng)分析和數(shù)值模擬,得到了兩種方式的結(jié)果并進(jìn)行了分析比較,為設(shè)計(jì)方案的選擇提供了依據(jù)。
This paper gives out the theoretic bases of the deploying kinematic analysis of dbs, and based on the deploying principle of deployable booms, this paper derives an analytical model of deployable booms for dsp . considering the topology of the boom systems, this paper discussed the dbs's two placements on the satellite and two corresponding movements for the booms . in this paper, such two movements are discussed in depths, and digital simulations have been made to check the probability 本文給出了伸桿機(jī)構(gòu)展開(kāi)運(yùn)動(dòng)學(xué)分析的理論依據(jù),從伸桿機(jī)構(gòu)展開(kāi)原理出發(fā),建立了雙星伸桿機(jī)構(gòu)展開(kāi)運(yùn)動(dòng)學(xué)模型,根據(jù)雙星伸桿總體設(shè)計(jì)方案,分析了伸桿在星上的兩種主要布置方式并做了相應(yīng)的展開(kāi)運(yùn)動(dòng)分析和數(shù)值模擬,得到了兩種方式的結(jié)果并進(jìn)行了分析比較,為設(shè)計(jì)方案的選擇提供了依據(jù)。
The analysis results show that the palcement styles and the rotating angles of such a large scale deployable boom systems are functional importantly . the motions and damps of the boom systems also take importance . if motions become larger, the time for the booms to reach their spreaded states is shorter, and the impact velocities become larger, the impact accelerations become larger too 分析結(jié)果表明,對(duì)于大尺度的伸桿機(jī)構(gòu),其布置方式和展開(kāi)角度對(duì)其展開(kāi)運(yùn)動(dòng)有重要的影響;同時(shí)也研究了鉸鏈處外力矩對(duì)展開(kāi)運(yùn)動(dòng)的影響,隨著該力矩的增大,伸桿到達(dá)鎖定狀態(tài)的時(shí)間減少,碰撞時(shí)的速度增加,由此產(chǎn)生較大的加速度;分析了伸桿彈性和阻尼對(duì)伸桿展開(kāi)過(guò)程的影響,彈性增大碰撞加速度增大,阻尼增大加速度減小,因此可將鉸鏈處外力矩和伸桿阻尼作為伸桿展開(kāi)運(yùn)動(dòng)調(diào)節(jié)的手段。