Abstract
This paper studies the dynamics of vibro-impact capsule systems with one-sided and double-sided constraints under variations of control parameters, including frequency of excitation, mass ratio, and stiffness ratio. The aim of this study is to optimize the progression speed of the capsule system. Extensive comparisons reveal that the capsule system with one-sided constraint is better than the one with double-sided constraints in terms of progression speed. Moreover, the system’s period-one one-right-impact motion is proved as the ideal vibration condition due to its lowest energy consumption for impacts. According to the dynamic analyses of control parameters, an inner mass with its weight similar as the weight of capsule and a right constraint with a relative weak stiffness are beneficial for further accelerating the capsule system forwards.
Highlights
Pipelines play an important role in a large number of modern industries, which are essential for oil and gas transport, water supplies, and so on
With many pipelines being located in remote and harsh locations, such as underground or seabed, access for inspection, maintenance and repair work could be extremely difficult. It becomes a costly issue if the pipeline has to be drained and production stopped while repair work takes place
The capsule system with one-sided constraint maintains forward progression with the progression speed deceasing when the mass ratio increases, see subplots (c) and (d). This observation indicates that a tiny inner mass is hard to vibrate a huge capsule; it is better to design the weight of the inner mass closing to that of the capsule
Summary
Pipelines play an important role in a large number of modern industries, which are essential for oil and gas transport, water supplies, and so on. With many pipelines being located in remote and harsh locations, such as underground or seabed, access for inspection, maintenance and repair work could be extremely difficult. The dynamics of the vibro-impact capsule system, which consists of a capsule main body interacting with a harmonically driven internal mass, has been studied extensively by Liu et al [5,6,7,8,9,10,11]. Dynamics of the system in various environments was investigated in [6], and numerical results show that the behaviour of the system becomes very complex when the capsule is moving in a fluid, but the nature of the friction mechanism becomes less significant when the weight of the internal mass.
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