请教轴承计算出错

blueprint2003

当模型不加入axhd时计算没有问题 但是当加入axhd时
出现
2  $ Warning (Code 8420003)

2         Jacobian update for bodies was not successful in step 380
2         -> Attempt to reduce step size

3 For body MB-Wall1 the aimed accuracy could not be reached.
3 Balance of forces:          5.83709E+00 / 1.58713E-03 (reached/aimed)
3 For body MB-Wall3 the aimed accuracy could not be reached.
3 Balance of forces:          8.41449E-02 / 1.08707E-03 (reached/aimed)
3 For body MB-Wall5 the aimed accuracy could not be reached.
3 Balance of forces:          2.48047E-02 / 1.24016E-03 (reached/aimed)
3 For body MB-Wall6 the aimed accuracy could not be reached.
3 Balance of forces:          2.16971E-02 / 1.10283E-03 (reached/aimed)
3 For body MB-Wall7 the aimed accuracy could not be reached.
3 Balance of forces:          7.79299E-02 / 1.11776E-03 (reached/aimed)
3 For body MB-Wall2 the aimed accuracy could not be reached.
3 Balance of forces:          2.31084E+01 / 5.17081E-02 (reached/aimed)
3 For body MB-Wall4 the aimed accuracy could not be reached.
3 Balance of forces:          5.12536E-02 / 1.09229E-03 (reached/aimed)
1 Interrupted or ended loop unsuccessful after 800 iterations
2  $ Warning (Code 9930004)

2         Non-constant step size was requested. Tried to undershoot minimum step size
2         more than once due to troubles in model loop.
2         Step size could not be adapted successfully.
2        
2         User action: (1) Use smaller minimum step size
2                      (2) Restart simulation up to last successful step
2                          and analyze behavior with IMPRESS 3D
2                      (3) Contact technical support

2  $ Warning (Code 8420006)

但是检查了轴承座有限元模型的约束和主节点的自由度都没有问题
请问这个问题该如何解决？

blueprint2003

另外 我的曲轴有限元模型还没对硅油减振器弹簧刚度进行修改
修改参数的原则是什么不太清楚   是试凑刚度使曲轴固有频率与实际相等？

zhangpengwei

载荷步太大，同时迭代次数过少。调整即可。

blueprint2003

谢谢
但是我调整过了 精度 都降到0.01
迭代次数都到800了

DrLan

一般的止推轴承模块算通了吗？先算通，再用axhd

blueprint2003

DrLan 发表于 2012-11-6 22:37
一般的止推轴承模块算通了吗？先算通，再用axhd

蓝博士，一般的止推我算过了 都没问题，就是加上axhd后 总是无法达到收敛精度。并且有的转速下能算，有的转速下不能收敛，是不是燃气压力曲线有问题呢，因为没有试验数据，都是调出来的。
这个应该从哪个方面考虑解决呢。

DrLan

你看看一般止推的止推力有多大？应该不会很大。