針對(duì)靜平衡求解過(guò)程中出現(xiàn)Lock Up問(wèn)題的解決方法Solver Settings - EquilibriumErrorSpecifies the maximum relative displacement error allowed during static simulations.The default is 1.0E-04 and the range is Error 0定義靜平衡求解過(guò)程中的位移相對(duì)誤差；此數(shù)值越大求解越容易收斂，自然誤差也越大。TlimitSpecifies the maximum translational increment allowed per iteration during static simulations performed using static simulations.The default is 20 and the range is Tlimit 0定義靜平衡求解過(guò)程中，每一步迭代的最大位移增量；對(duì)于復(fù)雜模型，若位移增量過(guò)大，受力的突變會(huì)導(dǎo)致靜平衡求解失敗；AlimitSpecifies the maximum angular increment allowed per iteration. The default units for Alimit are radians. To specify Alimit in degrees, add a D after the value.The default is 0.17453 (10 D) and the range is Alimit 0與Tlimit相似，需要注意的地方是默認(rèn)單位是“弧度”，若需要輸入“度”，必須在數(shù)值后面加“D”。如需要設(shè)置為10度，輸入為10DMaxitSpecifies the maximum number of iterations allowed for finding static equilibriums.The default is 25 and the range is Maxit 0.最大迭代步數(shù)，應(yīng)該與Tlimit和Alimit配合設(shè)置；假設(shè)初始狀態(tài)與平衡狀態(tài)的位移相差100mm，而Tlimit設(shè)置為1，則Maxit需要設(shè)置比100大，設(shè)置為200應(yīng)該差不多了。StabilitySpecifies the fraction of the mass and damping matrices ADAMS/Solver adds to the stiffness matrix. Adding a fraction of the mass and damping matrices to the stiffness matrix canstabilize the iteration process and prevent the iteration from diverging. Often the stiffness matrix is singular for a system because the system is neutrally stable (for example, the system moves in certain directions without affecting the potential energy). Adding a fraction of the mass and damping matrices to the stiffness matrix removes this singularity and makes it possible to solve for equilibrium positions. The value of Stabilitydoes not affect the accuracyof the solution, but it doesaffect the rate of convergenceof the iteration process.The default is 1.0E-05 and the range is Stability 0.施加于剛度矩陣的一個(gè)“穩(wěn)定系數(shù)”，使迭代過(guò)程更加平穩(wěn)，更容易收斂；此數(shù)值不影響求解精度，理論上越大使迭代越容易收斂，但越大會(huì)使求解越慢。ImbalanceSpecifies the maximum force imbalance allowed during static simulations performed using static analyses.The default is 1.0E-04 and the range is Imbalance 0.個(gè)人理解為與ERROR是相類似的，此處為力的誤差;此數(shù)值越大求解越容易收斂，自然誤差也越大。以上各數(shù)值，ERROR、Imbalance對(duì)求解精度是有影響的，不宜設(shè)置過(guò)大；.Error、Imbalance設(shè)置越小，Tlimit、Alimit需要設(shè)置得越小，Maxit需要設(shè)置得越大，求解時(shí)間越長(zhǎng)；Tlimit、Alimit與Maxit要配合使用；Stability根據(jù)實(shí)際情況設(shè)置；Maxit影響求解失敗前的求解次數(shù)，Stability影響求解速度。正確的設(shè)置，可以在效率與精度之間得到一個(gè)平衡點(diǎn)！以下是對(duì)求解過(guò)程的非專業(yè)理解：下圖是對(duì)于帶有前、后板簧的三軸卡車設(shè)置參考：以上純屬個(gè)人非專業(yè)理解，如有錯(cuò)漏之處，請(qǐng)指出，謝謝,Tilt Table(側(cè)翻試驗(yàn)臺(tái))TestRig Template的建立比較簡(jiǎn)單: 建立一general part(table),與ground之間是revolution joint,并施加一joint motion于其上, 建立兩個(gè)mount part(output communicator是輪胎template中的左側(cè)輪胎),minor role分別為front,rear等等, mount part的x,y方向位置由input communicator(粗略的可以輸入wheel center location)確定,z方向與table水平, mount part與table之間通過(guò)bushing連接,bushing的方向?yàn)?,90,90, z方向剛度根據(jù)需要設(shè)定,一般設(shè)定得比較大,主要是限制整車的側(cè)向滑動(dòng), 其他方向以及旋轉(zhuǎn)剛度可設(shè)為0,或根據(jù)需要設(shè)置較小的值,將此template輸出cmd文件,寫字板打開(kāi)cmd文件,修改其中model class為testrig,以及model class附近相關(guān)代碼,Simulation Submitmacro代碼編寫: 參照4postrig中的macro，此處macro代碼實(shí)現(xiàn)兩個(gè)功能： 建立table與tire的關(guān)聯(lián),joint motion的輸入,將Demo Vehicle改成4WD，只需要對(duì)Powertrain template進(jìn)行簡(jiǎn)單修改即可，主要是增加兩輸出,Powertrain修改的具體步驟如下：1.建立input communicator（location，minor role front）2.新建一construction frame（定義方向0,90,0）3.建立一general part4.建立cylindrical geometry5.建立revolute joint6.建立output communicator（mount，minor role front）7.對(duì)joint force diff_output Function進(jìn)行修改8.新建joint force（注意Function的定義）9.另存為R_4WD_powertrain10.用修改后的template新建一subsystem（minor role rear）11.進(jìn)行shift操作，移動(dòng)至合適位置完成效果圖呵呵，兩個(gè)輸出的初始位置反了，geometry還比較嬌小,下面對(duì)整車assembly進(jìn)行少量更改：1.新建TR_4WD_Demo assembly（Powertrain subsystem使用剛新建的）2.view-subsystem切換至TR_Front_Subs