發(fā)布時(shí)間：2018-05-22 08:35

  本文選題：材料試驗(yàn)機(jī) + 復(fù)合加載　； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：管材液壓成形是一種實(shí)現(xiàn)結(jié)構(gòu)輕量化的塑性加工技術(shù),管材屈服行為的研究有助于預(yù)測(cè)材料成形的過(guò)程,分析缺陷產(chǎn)生的原因,對(duì)于液壓成形工藝的改進(jìn)具有指導(dǎo)性意義。為研究管材屈服行為,需要進(jìn)行大量的管材試驗(yàn),因此開發(fā)專用試驗(yàn)設(shè)備很有必要。針對(duì)適用于液壓成形的合金管材,本課題開發(fā)內(nèi)外壓復(fù)合加載試驗(yàn)機(jī)控制系統(tǒng),實(shí)現(xiàn)管材軸向壓力和內(nèi)外壁表面壓力的同步復(fù)合加載,進(jìn)行復(fù)雜三維應(yīng)力狀態(tài)下的管材屈服試驗(yàn)。在軸向力以及內(nèi)外壓力的復(fù)合作用下,管材負(fù)載受力情況復(fù)雜,對(duì)此進(jìn)行了應(yīng)力和應(yīng)變分析,建立管材中部位置的各向應(yīng)力與外界加載量的關(guān)系和各向應(yīng)變與管材形狀參數(shù)的聯(lián)系,并根據(jù)應(yīng)力應(yīng)變分析確定了需要采集的物理量,提出了具體的應(yīng)力加載方案。加載量的控制效果直接影響管材的試驗(yàn)效果,因此對(duì)試驗(yàn)機(jī)控制系統(tǒng)進(jìn)行了分析。首先建立了軸向推力缸和內(nèi)外增壓缸的數(shù)學(xué)模型,并進(jìn)行了單通道的仿真分析;然后根據(jù)加載原理搭建了多通道復(fù)合加載的試驗(yàn)機(jī)系統(tǒng),通過(guò)仿真分析得到了加載量之間的影響規(guī)律。針對(duì)復(fù)合加載的影響和管材負(fù)載的特性分析了試驗(yàn)機(jī)的控制策略。為消除復(fù)合加載時(shí)各加載量之間的相互影響,采用引入補(bǔ)償回路的方式改善了管材軸向壓力和內(nèi)外壁表面壓力的控制效果。對(duì)于管材在加載過(guò)程中剛度變化的問(wèn)題,設(shè)計(jì)了傳統(tǒng)PID和模糊理論結(jié)合的模糊PID控制器。根據(jù)試驗(yàn)需求和系統(tǒng)硬件參數(shù),編寫試驗(yàn)機(jī)控制程序,實(shí)現(xiàn)信號(hào)讀取、模式切換和數(shù)據(jù)保存。在完成系統(tǒng)單通道調(diào)試后,進(jìn)行了復(fù)合加載實(shí)驗(yàn),實(shí)驗(yàn)結(jié)果表明本試驗(yàn)機(jī)能夠穩(wěn)定的進(jìn)行復(fù)合加載,揭示了管材在內(nèi)外壓加載情況下的部分變形規(guī)律。
[Abstract]:Tube hydroforming is a light weight plastic processing technology. The study of tube yield behavior is helpful to predict the process of material forming and analyze the causes of defects. It is of guiding significance for the improvement of hydroforming process. In order to study the yield behavior of pipes, a large number of pipe tests are needed, so it is necessary to develop special test equipment. Aiming at the alloy pipe which is suitable for hydroforming, the control system of internal and external pressure compound loading testing machine is developed in this paper, which realizes the synchronous composite loading of tube axial pressure and inner and outer wall surface pressure. The tube yield test under complex three-dimensional stress state was carried out. Under the combined action of axial force and internal and external pressure, the load of pipe is complicated, so the stress and strain are analyzed. The relationship between the stress in the middle position of the pipe and the external loading quantity and the relation between the strain in each direction and the shape parameters of the pipe are established. According to the stress-strain analysis, the physical quantities that need to be collected are determined, and the concrete stress loading scheme is put forward. The control effect of loading quantity directly affects the test effect of pipe, so the control system of test machine is analyzed. Firstly, the mathematical models of axial thrust cylinder and internal and external pressurized cylinder are established, and the simulation analysis of single channel is carried out, and then the multi-channel composite loading testing machine system is built according to the loading principle. Through the simulation analysis, the influence law of the loading amount is obtained. The control strategy of the testing machine is analyzed according to the influence of composite loading and the characteristics of pipe load. In order to eliminate the interaction between the loading quantities during the composite loading, the axial pressure of the pipe and the surface pressure of the inner and outer wall were improved by introducing the compensation loop. A fuzzy PID controller based on traditional PID and fuzzy theory is designed to solve the problem of stiffness change in the course of loading. According to the test requirements and system hardware parameters, the control program of the test machine is written to realize signal reading, mode switching and data saving. After the single channel debugging of the system was completed, the compound loading experiment was carried out. The experimental results show that the test machine can carry out the composite loading stably, and reveal the partial deformation law of the pipe under the condition of internal and external pressure loading.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH87;TP273

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李卓;耿麒先;;大型多功能試驗(yàn)機(jī)系統(tǒng)設(shè)計(jì)及加載架力學(xué)特性[J];北華大學(xué)學(xué)報(bào)(自然科學(xué)版);2016年06期

2 王庭俊;趙東宏;周建華;;電子萬(wàn)能材料試驗(yàn)機(jī)測(cè)控系統(tǒng)的開發(fā)研究[J];測(cè)控技術(shù);2016年10期

3 黃志方;;國(guó)產(chǎn)試驗(yàn)機(jī)的發(fā)展現(xiàn)狀及趨勢(shì)——縱橫行業(yè)二十年 三思再續(xù)新篇章[J];理化檢驗(yàn)(物理分冊(cè));2016年08期

4 商玉美;吳子今;陳驍堯;龔俊杰;;基于測(cè)試與仿真的數(shù)控折彎?rùn)C(jī)滑塊剛性分析[J];機(jī)床與液壓;2016年14期

5 王一凡;呂曉東;;基于PID的多線程材料試驗(yàn)機(jī)數(shù)控系統(tǒng)研究[J];機(jī)械工程與自動(dòng)化;2015年02期

6 李和平;周星;徐惟誠(chéng);岑曉燕;沈佳誼;;GB/T 228.1-2010中應(yīng)力速率的三種理解及在宣貫和實(shí)施過(guò)程中出現(xiàn)的問(wèn)題[J];理化檢驗(yàn)(物理分冊(cè));2013年08期

7 董若男;常世芳;;淺談新三思微機(jī)控制電子萬(wàn)能試驗(yàn)機(jī)的常見故障及故障排除方法[J];計(jì)量與測(cè)試技術(shù);2013年02期

8 張波;孫黎波;;試驗(yàn)機(jī)剛度對(duì)金屬室溫拉伸試驗(yàn)結(jié)果的影響[J];科技創(chuàng)新導(dǎo)報(bào);2012年33期

9 劉東升;樊黎霞;;合金鋼管材液壓成形試驗(yàn)機(jī)合模機(jī)構(gòu)液壓系統(tǒng)的設(shè)計(jì)與仿真研究[J];機(jī)床與液壓;2012年13期

10 韓俊偉;;電液伺服系統(tǒng)的發(fā)展與應(yīng)用[J];機(jī)床與液壓;2012年02期

相關(guān)博士學(xué)位論文 前2條

1 崔曉磊;內(nèi)外壓復(fù)合作用下管材塑性失穩(wěn)行為研究[D];哈爾濱工業(yè)大學(xué);2015年

2 王長(zhǎng)陶;基于可拓控制策略的材料試驗(yàn)機(jī)電液比例控制系統(tǒng)的研究[D];浙江大學(xué);2002年

相關(guān)碩士學(xué)位論文 前2條

1 張德吉;三向應(yīng)力管材試驗(yàn)機(jī)控制研究[D];哈爾濱工業(yè)大學(xué);2015年

2 劉東升;高強(qiáng)度合金鋼管材液壓成形試驗(yàn)機(jī)的設(shè)計(jì)與開發(fā)[D];南京理工大學(xué);2011年

，

本文編號(hào)：1921346