【正文】 alysis and interference check, etc., are conducted in the advanced planning, therefore the design time of jig and gripper are shortened, accuracy rate is improved, modification work in the later stage is considerably reduced.Key words: BIW。 fit method基于數(shù)字化工廠的白車身焊裝前期規(guī)劃寧宇1,2 韓英淳1 李悅2（；）【摘要】以某企業(yè)B車型主焊線規(guī)劃為例，對數(shù)字化工廠技術在其白車身焊裝線前期規(guī)劃中的應用進行了闡述。 Performance test基于UG的車身點云數(shù)據(jù)快速對齊方法高尚鵬 徐家川 李迪 （山東理工大學）【摘要】根據(jù)圖形坐標變化理論，提出了基于UG點擬合法的汽車車身點云數(shù)據(jù)坐標快速對齊方法，介紹了點擬合法的坐標變化理論及汽車車身坐標系與UG系統(tǒng)坐標系的對齊方法。主題詞：壓縮天然氣發(fā)動機 過量空氣系數(shù) 點火時刻 性能試驗Performance Test of CNG Car Engine featuring Electronicallycontrolled InjectionZhang Qun1,2, Wang Tianyou1, Wu Xiqing1,2, Guo Yunjie1, Wang Gangde1, Fu Xiaoguang1, Li Qi2, Liu Shuliang1(1. State Key Laboratory of Internal Combustion Engines, Tianjin University。 Diesel engine。結果表明，對于無催化轉換裝置的重型柴油機而言，與含硫量約為800106的柴油相比，采用含硫量約為273%；開發(fā)無尾氣后處理裝置的電控柴油機，為滿足歐Ⅲ排放標準，重點是柴油機本身燃燒系統(tǒng)的開發(fā)和控制潤滑油消耗。 University)【Abstract】The concept of describing the performance indicators of the mechanical ponents with random vectors is presented, and the characteristics of vector variance matrix determinant value and variance matrix diagonal in describing the vector divergence of the performance indicators, are investigated and pared. A clutch diaphragm spring is set as an example, in which random vector is used to describe geometry size indicator of diaphragm spring, and by using MonteCarlo simulation methods, the pseurandom vector samples which have identical mean values and different standard deviations are analyzed in order to investigate the applicability of using dimension vector variance matrix determinant and variance matrix trace to describe vector divergence of random vector.Key words: Clutch。 Optimization design。 Optimized design車門結構優(yōu)化設計的靈敏度分析研究 張繼偉1（； 汽車車身先進設計制造國家重點實驗室）【摘要】采用靈敏度分析方法以質量輕為優(yōu)化目標,扭轉剛度和頻率為約束條件,%，%，%。主題詞：雙十字軸式萬向聯(lián)軸器 中間軸相位角 優(yōu)化設計Optimization of the Intermediate Shaft Phase Angle in the Double Cross Universal CouplingLi Lun1 Fei Erwei1 Liu Jiazi3( FAW Group Corporation Ramp。虛擬分析預測出的疲勞壽命結果與物理試驗結果非常接近，因此可以利用其部分或全部替代物理試驗來驗證后橋的改進設計。主題詞：發(fā)動機 活塞銷 卡滯 殘余間隙 Analysis on the Piston Pin Seizing Mechanism of Engine Crankconnecting RodSi Qingjiu, Zhan Zhangsong, Min Long, Xu Yong(Automotive Engineering Institute of Changan Automobile Co., Ltd)【Abstract】The mechanism and nature of piston pin seizure occurring in the development of an engine is puted and analyzed by simulation in the paper, and the “residual clearance” concept is presented. The deformation diagram of the contact friction pair under a certain stiffness indicates the correlation between the deformation of assembling clearance and its contact friction pairs with “residual clearance”, the cause of piston pin seizure is thus identified. Based on this and bine with engineering practice, the engineering basis of optimization design and friction pair clearance is presented, test verifies feasibility of the optimized design.Key words：Engine。 Key ponents。 meeting the fitting clearance requirement of assembling。 Suppression method轎車發(fā)動機艙關鍵零部件的布置研究彭岳華 高衛(wèi)民 徐康聰 （上海汽車集團股份有限公司） 【摘要】闡述了發(fā)動機艙關鍵零部件布置的6個原則：滿足基本動靜態(tài)間隙原則；符合發(fā)動機動力總成的動態(tài)包絡；滿足總裝的裝配間隙要求；保護駕駛艙成員的安全碰撞要求；滿足熱力學布置要求。結果表明，采用阻值較大及阻尼電阻長度較長的火花塞、在點火線圈的初級和次級繞組間加入屏蔽層，以及采用濾波器等可有效提高汽車發(fā)動機點火系統(tǒng)的電磁兼容性能。 2. Changchun Xuyang Faway Johnson Automotive Seat frame Co.,Ltd)【Abstract】A detailed finite element analysis model of a car rear seat frame was built in this paper. The static stiffness and dynamic impact strength of the seat frame are simulated and ana