Research On Regulation Strategy And Experiment Of Hybrid Buoyancy System For Deep-sea Mobile Float

The deep-sea float is an important instrument for collecting marine data.The variable buoyancy system is not only a key component for achieving buoyancy regulation,but also a major device for energy consumption.In this thesis,a hybrid variable buoyancy system that can use depth-varying ocean pressure energy is developed and tested for performance.A lowenergy multi-step regulation strategy is proposed for the floating motion and numerical theoretical analysis is carried out.Both studies provide technical support for achieving ocean observation targets in a wider sea area and longer observation time.The research in this thesis is mainly divided into two parts: the performance test research of hybrid variable buoyancy system and the theoretical research of multi-step buoyancy regulation strategy.In the performance test study,the scheme design,component selection and system assembly of the hybrid variable buoyancy system were completed,according to the requirements of the subject project.According to the actual working conditions of the deep-sea float,the deep-sea simulation device was built.The key functions of low-pressure oil return function,high-pressure oil discharge function,energy storage and energy release of the accumulator were tested.The experimental results show that the hybrid variable buoyancy system has good performance,and the auxiliary module can store and utilize the depth-varying ocean pressure energy.The system has good stability.In the study of buoyancy regulation strategy,both the motion and energy consumption characteristics of deep-sea floats are analyzed.Based on considering floating time and energy consumption at the same time,a multi-step oil discharge regulation strategy with low energy consumption is proposed for floating motion.The influence of setting the minimum floating speed on energy consumption is studied by setting different speed intervals,and the conclusion is drawn that the energy consumption will be less with lower minimum floating speed.The energy consumption model is solved,and the relationship between the times of multi-step buoyancy regulation and energy consumption is obtained.The result proves that the proposed multi-step buoyancy regulation strategy can effectively reduce energy consumption.