摘要
基于双稳态压电振动发电机系统参数的非线性,建立了随机激励环境下压电振动发电机的动力学模型。研究了振源频率改变、振源个数选取和振幅变化对系统输出响应的影响,分析了磁间距变化对系统双稳态特性和输出电压的影响。结果表明:当振源频率或振幅改变时,系统响应表现为小幅周期运动、大幅混沌运动和小幅周期运动。当多个振源激励时,压电振动发电机具有更大的谐振带宽和更高的能量转换效率。当磁间距为3.9 mm<d<6.6 mm时,系统具有双稳态特性,系统响应表现为大幅周期运动,此时压电振动发电机输出电压值最大。
The dynamic model of a piezoelectric vibration generator under random excitation was established based on the nonlinearity of its parameters. Influences of the changes of frequency and amplitude, and the choice of numbers of vibration sources on the system output response were studied. Effect of the magnetic distance d changes on the bistable characteristics and the system output voltages was analyzed. The results show that when the frequency or amplitude of the vibration source changes, the system response develops from small periodic motion to large chaotic motion, and then returns to the small periodic motion. Under the multi-source excitation, the piezoelectric vibration generator has larger resonant bandwidth and higher energy conversion efficiency. When 3.9 mm d 6.6mm, the system has bistable characteristics and vibrate with large period, and the output voltage of the piezoelectric vibration generator will get the maximum.
出处
《噪声与振动控制》
CSCD
2015年第2期36-40,共5页
Noise and Vibration Control
关键词
振动与波
压电发电机
非线性振动
动力学模型
动态响应
振动特性
vibration and wave
piezoelectric generator
nonlinear vibration
dynamic model
dynamic response
vibration performance
