Analysis and Discussion on the Characteristics of Continuous Vibration Isolation Machine Tool System

The vibration power flow in a finite asymmetrical continuous vibration isolation machine system is a complex function of the excitation frequency, the performance parameters of the isolator and the installation position and the admittance of the infrastructure. In order to reveal the influence of the main parameters of the system on the power flow of the input foundation, the following theoretical calculations and analysis are carried out according to the formula. In each figure, the ordinate indicates the power flow transmitted to the foundation under the unit excitation force (Powerflowspectra), and the abscissa indicates The excitation frequency (Frequency). The influence of the inherent characteristics of the continuous isolator on the input power flow and the reduction of the isolator stiffness will reduce the overall level of the input base power flow, which is evident in the low frequency range. In order to improve the vibration isolation effect, the stiffness of the vibration isolation device of the continuous vibration isolation system should be controlled, but the excessively soft continuous vibration isolator will bring the strength structure and technical difficulties, cause instability, and be easily compacted without effect. Even if the continuous isolator damping is increased from 0.01 to 0.2, the power flow of the input base is essentially constant over the full frequency band. This shows that the vibration isolator damping is not an effective adjustment parameter for controlling the basic vibration. The study of the influence of the inherent characteristics of the foundation on the input fundamental power flow shows that as the foundation stiffness increases, the power flow of the input base will decrease. Moreover, due to the change in the inherent characteristics of the foundation, the peak position of the spectral line is caused to move. In practice, the machine tool should be installed on the rigid part of the slab or deck in combination with the on-site conditions, and avoid installing it in a soft place such as the middle part of the site. The power flow into the base generally increases. At the same time, the power flow line is smoother and the peak value is reduced. From this point, the system can safely pass through the resonance region. Therefore, it is beneficial to properly increase the base damping. . In this paper, the energy transfer analysis method of finite continuous asymmetric machine tool vibration isolation system is proposed by using power flow theory. The research shows that the power flow transfer spectrum is a complex function of the dynamic characteristics of the system, and the effect of the main parameters is elaborated: reducing the stiffness of the continuous isolators is beneficial to the improvement of the vibration isolation performance while ensuring the stability of the system. The vibration isolator damping is not an effective adjustment parameter; it is advantageous to install the machine tool in a large rigid part of the foundation in practice, and at the same time try to improve the basic damping appropriately.

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