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随着现代工程技术的发展,很多旋转机械正在向高速和超高速方向发展。因而,这类机械的振动分析和振动稳定性的研究显得日益突出,其中系统的阻尼设计仍是个重要问题之一。本文以旋转另件的不平衡质量引起的干扰力为前提,试图对二自由度系统的最佳阻尼设计问题进行探讨,其中某些结论可以为多自由度系统的初设计阶段或近似分析中提供参考。图1是二自由度具有粘滞阻尼的强迫振动系统,其中m_1、K_1为主振系统,m_2、K_2为阻尼吸振器系统。对此系统最佳阻尼的设计过去已有详尽分析。这些设计对于干扰力为Psinωt的系统较为实用。但工程中经常遇到象图2这样的旋转系统,可以简化为图3所示的模型,其中m_2、K_2,
With the development of modern engineering technology, many rotating machinery are developing towards high speed and super speed. Therefore, the vibration analysis and vibration stability research of this type of machine is becoming more and more prominent. The damping design of the system is still one of the most important issues. In this paper, the disturbance force caused by unbalanced mass of rotating parts is taken as a premise, and the optimal damping design of two degree of freedom system is discussed. Some of the conclusions can be provided in the initial design phase or approximate analysis of multi-degree of freedom system reference. Figure 1 is a two-degree-of-freedom viscous damping forced vibration system, where m_1, K_1 for the main vibration system, m_2, K_2 damping absorber system. The design of the system for optimal damping has been exhaustively analyzed in the past. These designs are more practical for systems with disturbances of Psinωt. However, the project often encounter such as the rotation system in Figure 2, can be simplified as shown in Figure 3 model, in which m_2, K_2,