ADAMS避免出錯(cuò)的設(shè)置求解器

1、最新 料推薦adams 求解器設(shè)置warning:the corrector has not converged after 1 attempts. no. of iterations = 6.error:the simulation is terminating at time = 7.53906e-03.adams can not solve the equations of motion because the mechanism haslocked up.at least one constraintcanno longer be satisfied.adams is unable t

2、o satisfy the constraint for: joint model_1.joint_3 .error:lockup detectedsolver setting-equilibriumadams/car2010-04-16 20:31:16閱讀 89 評(píng)論 0 字號(hào)：大中小針對(duì)靜平衡求解過(guò)程中出現(xiàn)lock up 問(wèn)題的解決方法errorspecifies the maximum relative displacement error allowed during static simulations.the default is 1.0e-04 and the range is

3、 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?。籥limitspecifies the

4、maximum angular increment allowed per iteration. the default units for alimit are radians. to specify alimit in degrees, add a d after the value.1最新 料推薦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 10d maxitspecifies the

5、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。stabilityspecifiesthe fractionof the massanddampingmatricesadams/solveraddsto thestiffn

6、ess matrix. adding a fraction of the mass and damping matrices to the stiffness matrix canstabilizethe iterationprocessandpreventthe iterationfromdiverging . oftenthe stiffnessmatrix is singular for a system because the system is neutrally stable (for example, the systemmovesin certaindirectionswith

7、outaffectingthe potentialenergy).addinga fractionof themassanddampingmatricesto the stiffnessmatrixremovesthissingularityandmakesitpossible to solve for equilibrium positions. the value of stabilitydoes not affect the accuracyofthe solution, but it doesaffect the rate of convergenceof the iteration

8、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

9、error是相類(lèi)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。2最新 料推薦正確的設(shè)置，可以在效率與精度之間得到一個(gè)平衡點(diǎn)！以下是個(gè)人對(duì)靜平衡求解過(guò)程的非專(zhuān)業(yè)理解：下圖是帶有前、后板簧的卡車(chē)求解設(shè)置參考：3最新 料推薦問(wèn)題：我的 adams仿真時(shí)出現(xiàn) “exception11detected ” ，然后就退出了，這是怎么回事，我以前裝過(guò)一個(gè) adams的版本然后卸了又裝了adams2005，是不時(shí)這個(gè)原因，哪位高手能給指點(diǎn)一下數(shù)據(jù)太大了，系統(tǒng)異常造成的應(yīng)該將 adams/2005里的 dformd.dll拷貝到 windows/system32/下，替換調(diào)以前的文件，