摘要
通过无阻尼卧式振动离心机的力学模型和数学模型,分析了主振弹簧因轴承温度升高刚度降低,导致幅频特性曲线变化和壳体、筛篮振幅不稳定原因,找到了筛篮幅频特性曲线上不受主振弹簧刚度影响的不动点,即筛篮工况点;结合壳体轴承高温下反共振频率,从筛篮振幅不变、壳体振动最小以及较小主振弹簧受力的观点,提出了激振频率与壳体系统固有频率相等并略小于高温筛篮系统固有频率的设计方法,并得到了实验验证。
Established undamped mechanical model and mathematical model of horizontal vibrating centrifuge. The main vibration spring stiffness gets lower due to the temperature rise of bearing, which leads to amplitude-frequency characteristic curve change, shell and screen-basket amplitude instability. Found the fixed point on the screen-basket amplitude-frequency characteristic curve is not affected by the main vibration spring stiffness. Combined with the an- tiresonant frequency in the case of higher temperature of bearings,in order to stablize the amplitude of screen-basket and the minimum amplitude of shell and the less stress of the main vibration spring, and put forward that the system natural frequency of shell and vibration frequency is equal and slightly lower than natural frequency of the screen-bas- ket, and verify such conclusion by experiments.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2013年第6期1084-1088,共5页
Journal of China Coal Society
关键词
煤用离心机
反共振
双质体
振幅稳定性
coal centrifuge
antiresonance
double body
the amplitude stability
