發(fā)布時(shí)間：2018-08-02 18:10

【摘要】：隨著電動(dòng)振動(dòng)臺(tái)推力的增大,特別是新型感應(yīng)式電動(dòng)振動(dòng)臺(tái)技術(shù)的成熟,振動(dòng)臺(tái)的冷卻散熱問(wèn)題逐漸凸顯。本文采用尋找熱源→計(jì)算熱功率→計(jì)算溫度→實(shí)驗(yàn)測(cè)量的思路,以35噸直接耦合式電動(dòng)振動(dòng)臺(tái)和16噸感應(yīng)式電動(dòng)振動(dòng)臺(tái)為例,研究了目前大推力振動(dòng)臺(tái)的主要熱問(wèn)題,主要內(nèi)容包括:(1)以35噸直接耦合式電動(dòng)振動(dòng)臺(tái)為例,研究直接耦合式電動(dòng)振動(dòng)臺(tái)的主要熱問(wèn)題:動(dòng)圈骨架底部容易出現(xiàn)局部高溫。研究借助傳統(tǒng)的計(jì)算公式和有限元方法進(jìn)行,計(jì)算動(dòng)圈骨架底端產(chǎn)生的感生電流和動(dòng)生電流。為得到與計(jì)算相關(guān)的電磁參數(shù),本文建立了臺(tái)體的磁路模型和電路模型,得到振動(dòng)臺(tái)的磁路分布和阻抗特性,進(jìn)而計(jì)算得到動(dòng)圈骨架中的電渦流,整理出骨架熱功率的計(jì)算式。針對(duì)動(dòng)圈骨架底端因電渦流產(chǎn)生的熱問(wèn)題,采用有限元法比較了現(xiàn)有三種不同結(jié)構(gòu)形式的動(dòng)圈骨架對(duì)感應(yīng)電流的抑制效果,并比較了三種結(jié)構(gòu)的動(dòng)力學(xué)特性。(2)以16噸感應(yīng)式電動(dòng)振動(dòng)臺(tái)為例,研究了感應(yīng)式電動(dòng)振動(dòng)臺(tái)主要的冷卻散熱問(wèn)題:長(zhǎng)時(shí)間大量級(jí)工作時(shí)感應(yīng)環(huán)的溫度往往偏高。這是由于感應(yīng)臺(tái)的感應(yīng)環(huán)只能采用風(fēng)冷的冷卻方式,而風(fēng)冷的冷卻效率較低。本文根據(jù)該感應(yīng)臺(tái)的設(shè)計(jì)參數(shù),著重對(duì)感應(yīng)環(huán)進(jìn)行研究:建立了感應(yīng)環(huán)的電路模型,計(jì)算得到了感應(yīng)環(huán)內(nèi)部的感應(yīng)電流;通過(guò)有限元法得到感應(yīng)環(huán)的感應(yīng)電流和工作溫度的分布狀況。首次設(shè)計(jì)并選擇了最佳的方案,對(duì)感應(yīng)環(huán)進(jìn)行溫度測(cè)量,實(shí)測(cè)數(shù)據(jù)與仿真結(jié)果吻合度較好。本文還采用仿真的方法,研究了冷卻氣體的風(fēng)速、風(fēng)壓、氣隙寬度對(duì)感應(yīng)環(huán)溫度的影響,增大風(fēng)壓和氣隙寬度可以提高冷卻效率,但也會(huì)帶來(lái)能源浪費(fèi)、噪聲增大、磁場(chǎng)減小的負(fù)面影響。(3)以16噸感應(yīng)式電動(dòng)振動(dòng)臺(tái)為例,研究了驅(qū)動(dòng)線圈的冷卻能力,采用有限元法建立了精確的驅(qū)動(dòng)線圈模型,并劃分了精細(xì)的網(wǎng)格。研究得到水壓與線圈最大溫升呈反比例關(guān)系;冷卻水水壓、溫度的分布沿著導(dǎo)線均勻變化,驅(qū)動(dòng)線圈在當(dāng)前工作狀態(tài)下有足夠的冷卻能力。課題設(shè)計(jì)了線圈的溫度測(cè)量方案,實(shí)測(cè)溫度數(shù)據(jù)與仿真結(jié)果偏差較小。
[Abstract]:With the increase of the thrust of the electric vibration table, especially the mature of the new induction electric vibrator, the cooling and cooling problem of the vibration table is becoming more and more obvious. This paper adopts the thinking of finding the heat source, calculating the heat power, calculating the temperature and measuring the experiment, and taking the 35 ton direct coupling electric vibration table and the 16 ton induction electric vibration table as an example. The main heat problems of the current large thrust shaking table are studied. The main contents are as follows: (1) taking the 35 ton direct coupled electric vibration table as an example, the main heat problem of the direct coupled electric vibration table is studied: the local high temperature is easy to appear at the bottom of the moving frame, and the study is carried out with the traditional calculation formula and the finite element method to calculate the bottom end of the moving frame. To obtain the induced current and movable current. In order to obtain the related electromagnetic parameters, the magnetic circuit model and circuit model of the platform are established. The magnetic circuit distribution and impedance characteristics of the vibrating table are obtained. Then the eddy current in the moving frame is calculated and the calculation formula of the thermal power of the skeleton is sorted. The finite element method is used to compare the effect of the current three different structural frames on the induced current, and the dynamic characteristics of the three structures are compared. (2) taking 16 ton induction electric vibration table as an example, the main cooling and cooling problems of the induction electric vibration table are studied. The temperature is often high. This is because the induction ring of the induction table can only adopt the cooling mode of air cooling, and the cooling efficiency of the air cooling is low. Based on the design parameters of the induction table, this paper focuses on the study of the induction ring: the circuit model of the induction ring is set up, the induction current inside the induction ring is calculated, and the sense of the induction loop is obtained by the finite element method. The distribution of the induced current and working temperature of the ring is designed and selected for the first time to measure the temperature of the induction ring. The measured data are in good agreement with the simulation results. This paper also uses the simulation method to study the influence of the wind speed, wind pressure and air gap width on the temperature of the induction ring, and increase the air pressure and the air gap width. Degree can improve the cooling efficiency, but it will also bring about energy waste, noise increase, and the negative effect of magnetic field. (3) taking 16 ton induction electric vibration table as an example, the cooling capacity of the driving coil is studied. The precise driving coil model is established by the finite element method, and the fine grid is divided. The maximum temperature rise of water pressure and coil is studied. The distribution of the cooling water pressure, the temperature distribution along the wire is uniform, and the driving coil has enough cooling capacity in the current working state. The project has designed the temperature measurement scheme of the coil, and the measured temperature data have little deviation from the simulation results.
【學(xué)位授予單位】：中國(guó)航天科技集團(tuán)公司第一研究院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB534.2

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本文編號(hào)：2160268