赫兹碰撞时，仿真参数的选择依据。希望对大家有用。

ahwsl

试验还是必不可少的，仿真参数的调整最主要还是取决于试验。

andyxin

谢谢你的奉献!

lijinyu

万分感谢！！！

kaser2000

谢谢你的无私奉献

zhangyingshuang

好人

johnson_liao

Hertz thoery is only for static behavior.

J

Vincent_Chan

johnson_liao wrote:
Hertz thoery is only for static behavior.

J

不知道廖先生对动态的接触参数的设置有什么建议？

johnson_liao

Briefly share my experience.
Hertz theory is only for static contact. Therefore, basically it's not applied to dynamics contact. In fact, the real stiffness varies by time for contact problem. Therefore, one simple way is adapted.
0.5*m*v^2=0.5*(K)*x^2 , you must determine x value, penetration. Then, you may try other different K values, 0.1*K,K and 10K. For rigid body system, you don't care about the very precise stiffness. Because another parameter , force exponent, will tune contact force automatically.  In a word, no any theories can offer the contact stiffness evaluation nowsday. Experiment is the necessary for contact/impact problem.

J

johnson_liao

One paper is very good material  about contact stiffness from ACMD 2004.
(the paper was posted in previous post.)

Its conclusion is :
The contact force model has been derived from the experimental data, and we find out that this model gives a good approximation to predict the impact responses of two colliding bodies. In order to measure the velocity before impact in the drop experiment, six photo interrupters in series close to the collision location are installed and calibrated by using the laser velocity meter. The parameters of the contact force model are estimated using the optimization technique. The contact force model obtained by drop test is applied to predict the impact force between the moving bar and the outer case in the magnetic contactor. Furthermore, the impact force by the theoretically calculated stiffness is much greater than that by the stiffness estimated from the drop type impact test.

J

johnson_liao

Nowsday, the contact assumption is the elastic deformation.
And, the penetration in the contact property is the max value. Therefore, it's no problem if based on the elastic assumption.

J

lxywp

3s

yinjunv

谢谢啊！！！！！！！！！！！！！

mouse227

xiexie

nuaa_nwh

谢谢啊，好文章