潜艇轴系纵向振动低频线谱的半主动动力反共振隔振方法

Low-frequency line spectra of propulsion shafting longitudinal vibration induced by propeller fluctuating thrust attenuates the sound stealth level of submarine seriously. Since the traditional vibration isolation technology is incapable of isolating the low-frequency line spectra, the dynamic anti-resonant vibration isolation method based on Resonance Changer is proposed. According to the dynamic frequency characteristic of low-frequency line spectra of propulsion shafting longitudinal vibration along with rotating speed variation, the semi-active control strategy is chosen to trace the low-frequency line spectra real-timely. The research is carried out as follows: (1) The propulsion shafting longitudinal vibration is studied by rotor dynamics theory, which the dynamic characteristics of lubricant oil film between thrust collar and tilting pads within thrust bearing are taken into account. Considering the effect of elastic coupling of hull to propulsion shafting, the dynamic model of propulsion shafting－hull coupled structure, which is used to study the generation mechanism of low-frequency line spectra of propulsion shafting longitudinal vibration, is built with sub-structure approach. (2) Taking the Resonance Changer as isolator, the anti-resonant vibration isolation characterisitc is analyzed, and the control law and control system of semi-active Resonance Changer is designed. Based upon these research findings, the semi-active anti-resonant vibration isolation for low-frequency line spectra of propulsion shafting longitudinal vibration is next investigated. The results will form the anti-resonant vibration isolation theory and semi-active control method of Research Changer, and provide solution to the problem of low-frequency line spectra of propulsion shafting longitudinal vibration.

螺旋桨脉动推力激励的推进轴系纵向振动低频线谱严重降低潜艇声隐身水平。针对传统隔振技术难以隔离低频线谱的瓶颈问题，提出基于共振转换器的动力反共振隔振方法对推进轴系纵向振动低频线谱进行控制，根据低频线谱随轴转速变化的动频特性，研究半主动控制策略实现对低频线谱的实时追踪和隔离。从两个层面展开研究：（1）以转子动力学观点分析推进轴系纵向振动，计入推力轴承润滑油膜的轴向动特性，考虑艇体对推进轴系的弹性耦合，以子结构方法建立推进轴系-艇体耦合结构的动力学模型，研究推进轴系纵向振动低频线谱的产生机理；（2）分析共振转换器的动力反共振隔振特性，建立半主动共振转换器的控制律和控制系统，研究推进轴系纵向振动低频线谱的半主动动力反共振隔振方法，结合轴系试验平台进行试验研究。研究成果将形成共振转换器的动力反共振隔振理论及其半主动控制方法，突破推进轴系纵向振动低频线谱治理的关键技术。

螺旋桨脉动推力激励的推进轴系纵向振动低频线谱严重降低潜艇声隐身水平。针对传统隔振技术难以隔离低频线谱的瓶颈问题，提出基于共振转换器的动力反共振隔振方法对推进轴系纵向振动低频线谱进行控制，根据低频线谱随轴转速变化的动频特性，研究半主动控制策略实现对低频线谱的实时追踪和隔离。从两个层面展开研究：（1）以转子动力学观点分析推进轴系纵向振动，计入推力轴承润滑油膜的轴向动特性，考虑艇体对推进轴系的弹性耦合，以子结构方法建立推进轴系—艇体耦合结构的动力学模型，研究推进轴系纵向振动低频线谱的产生机理；（2）分析共振转换器的动力反共振隔振特性，建立半主动共振转换器的控制律和控制系统，研究推进轴系纵向振动低频线谱的半主动动力反共振隔振方法，结合轴系试验平台进行试验研究。研究成果形成了共振转换器的动力反共振隔振理论以及其设计方法，突破推进轴系纵向振动低频线谱治理的关键技术。