In order to get the optimization structural parameters of the cutting the screw thread type low-cost energy-absorbing structures which is appropriate for medium car,Design parameters of low-cost screw shear energy absorption device which is matched to the car(total mass =2 500 kg) is to be optimized.Through using the method of orthogonal design,the model is established and analyzed by the finite element method.The results show that the optimal results are significantly affected by the thread shears width an...