Improvement of vibration protection of ship machines and mechanisms based on the use of dynamic stiffness compensators
Abstract
The purpose of this study is the theoretical justification for improving vibration protection of ship machines and mechanisms based on the use of dynamic stiffeners. The main disadvantage of existing vibration protection devices is the impossibility of resolving the objectively existing contradiction: their efficiency is achieved with a minimum total stiffness of the suspension and, at the same time, to limit the mobility of the mechanism protected from vibration, the stiffness of the elastic elements must be sufficiently high. Design solutions of dynamic vibration dampers are proposed with spring-loaded inertial masses coaxially located relative to the main elastic element of the suspension, which vibrate in antiphase relative to vibrations of the object protected from vibrations. Design schemes of dynamic vibration damper with stiffness compensation developed on the basis of provisions of automatic control theory are presented. Based on the analysis of the developed theoretical assumptions, the main factors affecting the value of the vibration isolation coefficient and allowing to obtain a dynamically stable oscillatory system are determined. The main results of preliminary mathematical modeling of vibration protection system using the model of dynamic damper of low mass vibrations are given. The result of the research is confirmation of the prospects of the proposed technical solutions and the possibility of practical implementation of a full-fledged solution to the problem of protecting ship machines and mechanisms from vibrations.
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