摘要
为揭示伺服阀自激噪声的产生机理,提出对伺服阀力矩马达的振动特性进行研究.给出一种射流管伺服阀力矩马达的结构及工作原理,基于结构力学基本原理,建立该射流管伺服阀力矩马达衔铁和射流管组件的的振动特性有限元分析数学模型,采用有限元分析方法,分析伺服阀力矩马达衔铁和射流管组件的前6阶振型,计算各种振型下伺服阀力矩马达衔铁和射流管组件的固有频率.研究结果表明,衔铁和反馈杆为伺服阀力矩马达产生振动的关键部位,为防止共振的发生,应尽量消除射流流场中与衔铁组件固有频率相接近的压力脉动激励信号.
To discover the mechanism of self-excited noise in servo-valves,the vibrational characteristics of hydraulic torque motor for servo-valve was studied.The structure and working principle of a hydraulic torque motor for servo-valve with jet pipe were given.Based on the basic principles of structural mechanics,a finite element mathematical model was set up for the vibrational characteristics of the assembly of armature and jet pipe in the torque motor.Using the finite element analysis method,the first six vibration modes were analyzed and the corresponding natural vibration frequencies of the assembly were calculated.The simulation results showed that the armature and feedback rod were the key parts which caused the vibration in the hydraulic motor for servo-valve.In order to avoid the resonance,excitation pressure pulsation signals in the jet flow field with similar frequency as that of the armature assembly,should be eliminated and depressed as much as possible.
出处
《兰州理工大学学报》
CAS
北大核心
2010年第3期38-41,共4页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(50875055)
关键词
伺服阀
力矩马达
振型
自激
有限元
servo-valve
torque motor
vibration mode
self-excitation
finite element
