Based on the theories of gear engagement , contact analysis , friction and heat transfer , a three - dimensional finite element model of gear tooth was established to investigate temperature distributions and variations along the contact path over a range of applied loads and operating speeds with consideration of lubrication conditions . sensitivity analysis of surface temperature to gear configuration , frictional heat flux , heat transfer coefficients , and oil and ambient temperature was conducted and the major parameters influencing surface temperature were evaluated 本文基于齒輪嚙合原理、輪齒接觸分析、摩擦學(xué)和傳熱學(xué),以有限元分析方法和理論分析計(jì)算相結(jié)合為手段并以實(shí)驗(yàn)測(cè)量結(jié)果作為參考,建立了適用于工業(yè)應(yīng)用并具有較高計(jì)算精度的高速齒輪傳動(dòng)輪齒溫度分析的模型和方法,系統(tǒng)地分析了輪齒本體溫度的大小和分布以及齒輪幾何、載荷及轉(zhuǎn)速和潤(rùn)滑冷卻條件等對(duì)輪齒本體溫度的影響。
Being lacking of understanding of behaviors of circular working shaft , the paper proposed theory about ring - beam ' s load - distribution calculations and analyzed the structural behavior of circular working shaft ( cws ) by the numbers from the standpoint of properties of structural style and stress incorporated with thoughts of shared load introduced to research of cws . first , regarding cws as structure of series of hypothetic horizontal circular rings and vertical beams , and considering cws ' s formation and development , the paper proposed load - distribution thoughts to solve cws ' s calculations . ring - beam calculation theory was put up and software cbtlmp1 . 0 was worked out based on the conditions of external applied load shared by rings and beams , and of deformation conformity 首先,本文提出用分載思想解決圓形工作井結(jié)構(gòu)的計(jì)算分析問(wèn)題,將圓形工作井結(jié)構(gòu)看成是由一系列的假想的水平圓環(huán)和豎直梁組成的結(jié)構(gòu),考慮工作井形成過(guò)程及形成階段與項(xiàng)進(jìn)階段的連續(xù)性,根據(jù)某一時(shí)刻相對(duì)于上一時(shí)刻外載增量由環(huán)與梁分擔(dān)、環(huán)與梁在交叉處變位增量一致的條件將環(huán)計(jì)算理論與梁計(jì)算理論結(jié)合起來(lái),據(jù)此建立了環(huán)?梁分載計(jì)算理論并研制了環(huán)?梁分載計(jì)算分析軟件cbtlmpv1 . 0 。
Based on this , presented a new micro pressure sensor , which adopted a si3n4 sensitive membrane ; since the membrane is very thin , we can use membrane - deflection theory to describe the deflection of the membrane under a uniformly applied load , and because with no bending stiffness , the sensitivity of the sensor was increased consequently . finally , numerical calculation of the deflection and stress analysis of the membrane was performed . by utilizing ansys simulation , we can testify that the performance of the sensor reached the design requirement 通過(guò)改進(jìn)敏感元件結(jié)構(gòu),提高了其性能,從而得到適用于靈巧蒙皮表面壓力測(cè)量應(yīng)用的器件陣列:在此基礎(chǔ)上,本文提出了一種新型的微型壓力傳感器結(jié)構(gòu),該結(jié)構(gòu)采用的敏感膜片以氮化硅為材料,厚度較薄,因此該膜片的變形適用于薄膜變形理論的分析,忽略了彎曲應(yīng)力的影響,從而提高了傳感器的靈敏度。
It was found that the friction force reduced when the sliding velocity increased under a relatively low applied load . the friction properties of the aligned carbon nanotube film were very uniform in test region . the film on aao template had a considerable self - lubricating effect and the friction coefficient of the film was only 0 . 082 結(jié)果表明:多孔aao模板上的定向納米碳管薄膜在干滑動(dòng)條件下其摩擦力隨滑動(dòng)速度的增加而減??;多孔aao模板上的定向納米碳管薄膜在大范圍內(nèi)具有相同的摩擦性能,其摩擦系數(shù)僅為0 . 082 。
Based on the random factor method , considering the randomness of both the elastic module of the structures and the applied load , the finite element equations of the structures are built , and the computational expressions of the mean value and mean variance of the structural displacement response and stress response are developed by the algebra method 利用隨機(jī)因子法,建立了結(jié)構(gòu)的彈性模量和外載荷同時(shí)具有隨機(jī)性時(shí)結(jié)構(gòu)的有限元方程;利用代數(shù)綜合法推導(dǎo)出結(jié)構(gòu)位移和應(yīng)力響應(yīng)的均值、方差的計(jì)算表達(dá)式。
In addition , the comparisons of displacements , velocities , solid effective stresses and pressure , obtained respectively by nonlinear model and linear model , display that the differences of the results become more obvious as the increase of the applied load , which demonstrates that the non - linear dependence of permeability on volume strain of solid phase is important as the deformation is not too small , and therefore cannot be ignored 此外,將本論文給出的非線性計(jì)算模型得到的位移、速度、固體有效應(yīng)力和壓力等與視滲透率為常數(shù)的線性模型的結(jié)果比較表明,載荷越大,兩種模型的計(jì)算結(jié)果差異越大。而當(dāng)載荷很小時(shí),兩模型的響應(yīng)相差很小。說(shuō)明在變形較大時(shí),滲透率與固體相體積應(yīng)變的依賴性不容忽視。