| With the development of the contemporary technology, the numerical equipments turn fast and efficient. Dynamic and static characteristic of the main system is the key factor of production. So it required to establish accurate element model. In this paper does research on quick assembled structure model building and optimum design for numerical control machine according to one three-parts beam which comes from Beijing No. 1 Machine Tool Plant.This paper bring out a useful method on testing the actual contact ratio of joints, which is base on relative displacement of vibration. Lots of useful data on tangency ratio of joints in several normal conditions can also be found in this paper. User element in ANSYS is used to deal with joint.This paper proposed a novel shock excitation experiment programmed called Rapid time-steady-state sinusoidal excitation swept frequency response function measurement system and method. In this way we adopted steady state sinusoidal, the excitation power is great and the energy is concentrated. Higher-order modes can be shocked out easily; excitation response use static data and have high SNR (more than 75dB); has more frequency resolution (due to precision of acquisition card), and it sampled in a whole cycle, the result is credible and has a high precision; we can greatly shorten our testing time as we use logarithm to sweep the frequency.And we also band this method together with finite analysis using for dynamic character experiment of the three-parts beam.At last, this paper introduced a method named unit volume energy analysis Technique.Basically, the method is developed according to sensitivity analysis.The unit volume energy criterion of weak substructures of a structure system is proposed. Additionally, the constraint condition of maintaining the weight of whole structure invariable is well satisfied. And then this method was used in rapid identify and brief optimize of the three-part beam...
|
PDF Full Text Request