車(chē)內(nèi)空調(diào)系統(tǒng)（HVAC system）模塊的研發(fā)主要在于氣流通道的優(yōu)化及熱交換性能的改善。凸輪機(jī)構(gòu)是其中一個(gè)重要組成部分，能夠達(dá)到使氣流在乘客區(qū)擴(kuò)散的要求。通常為凸輪機(jī)構(gòu)的預(yù)留空間會(huì)受到封裝的限制，也會(huì)考慮到重量，噪音及成本的約束。因此需要在氣流輸出口的面板上的控制端設(shè)計(jì)一個(gè)突起的旋鈕，如圖所示。在這個(gè)旋鈕上施加一定力矩可以控制其狀態(tài)的切換。這個(gè)力矩的大小嚴(yán)重影響著整個(gè)系統(tǒng)的質(zhì)量，為了能夠保證在控制端的一個(gè)較小而平滑且有效的力矩輸出，研究對(duì)機(jī)械裝置的影響，傳統(tǒng)的剛體機(jī)構(gòu)建模已經(jīng)不能滿足要求。本案例采取了samtech 有限元柔性體建模方法，為此類(lèi)問(wèn)題提供了一種可靠的解決方案，案例的主要組成部分分為：

The main parts ofthe study are:

? Preparation ofthe complete mechanism.

? FEA simulation(kinematics, large displacements / rotations, contact

& friction)with SAMCEF/MECANO “Structure & Motion”

? Correlationbetween bench measurements and theoretical values.

? Optimization of the ventilation track with BOSS-QUATTRO

得到主要結(jié)論如下：

The objective of this study was to reduce the number ofprototypes and tests usually needed to develop cam mechanism for HVAC system.The use of finite element method allows to define optimized geometry with nosuccessive tests and prototypes. Thanks to his unique capability in couplingstructural and kinematics analysis, SAMCEF/ MECANO is seen today as a majortool in the new cam design process in place at Delphi Thermal Systems Europe.Indeed, it shows the possibility to predict the torque and stresses generatedin a cam mechanism. It also shows interesting potential for optimization ofsuch a structure.