王爱华-白车身扭转刚度对整车操控性能的影响

Subjective evaluation - Lateral stiffness effect
Objective evaluation - Lateral stiffness effect
Correlation of Lateral stiffness
Yaw gain increases by 2.41% and time lag decreases by 4.57% with 10% increase in body lateral stiffness.
Validation
BIW torsional stiffness increased by 29%
Subjective evaluation
Validation model Torsional stiffness
Conclusion
Overall response of the vehicle has improved due to the
increase in torsional stiffness of the BIW.
The increase in lateral stiffness of the front lower arm attachment points leads to significant improvement in overall vehicle response but no much change is there in the return-ability of the vehicle.
扭转刚度
扭转工况下车身抵抗变形的能力
Passing steps
Cornering
扭转刚度的意义
静态或动态扭转工况下车上部件不受影响，比如车门可以整车开 关，密封依然良好等。 整车的操控性，NVH，耐撞性，耐久性等。
As a result of many earlier studies, it is known that
increase in stiffness of the vehicle body improves the
handling of the vehicle. But, there has been no attempt
made to predict how much improvement in handling
白车身扭转和横向刚度对整车 操控性能的影响
姓名： 王爱华 学号：31503082
参考文献
Hari Krishnan M, N Sreeraj, C Bhaskar, G Nagaraju and R Mugundaram， Maruti Suzuki India, Ltd. “Establishing Correlation between Torsional and Lateral Stiffness Parameters of BIW and Vehicle Handling Performance,” SAE Technical Paper 2011-01-0089, 2011, doi:10.4271/2011-01-0089
小
大
Objective evaluation - Torsional stiffness effect
Correlation of Torsional stiffness
Yaw gain increases by 1.77% and time lag decreases by 4.12% with 10% increase in body torsional stiffness.
occurs for a particular increase in body stiffness.
Process flow
仿真&实验 主观评价&客观测试 大胆的假设，小心的求证。
NEWBILITY
CAE(Torsional Stiffness)
Load & Boundary
Strain Energy Contour
Reason
提高扭转
刚度
提高前后 轮同步性 提高操控 性 提高左右 轮同步性
提高横向 刚度
ห้องสมุดไป่ตู้
讨论
测量扭转刚度时，载荷为什么加到避震器安装点上？
对于这类悬挂布置这种测试方法是否还有意义？
这种方法是不是更通用？
谢谢
CAE(Torsional Stiffness)
Iterations done in CAE
CAE(Lateral Stiffness)
Load & Boundary
Strain Energy Contour
CAE(Lateral Stiffness)
FABRICATIONS
FABRICATIONS
ISO/TR 8725
80kmph in a straight line
Range of −30 deg to + 30 deg, 0.5 Hz
Expert test drivers
Subjective evaluation- Torsional stiffness effect
扭转刚度
控制变量法
Effect of increase in torsional stiffness on lateral stiffness
Sin input test
An open-loop test method for determining the transient
response behavior of road vehicles