Experiment on vibration reduction performance of elastic ring squeeze film damper under sudden unbalance
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摘要:
为了研究在瞬态冲击(突加不平衡)下弹性环挤压油膜阻尼器(elastic ring squeeze film damper, ERSFD)对转子系统突增振动的抑制效果,设计并搭建带ERSFD的转子动力学实验台,开展突加不平衡动力学实验,获取阻尼器供油和不供油下转子系统升速及降速过程中的振动响应规律。结果表明ERSFD供油后有效地抑制了突加不平衡引起的瞬态响应,降低了突加不平衡引起的额外振动74.39%,同时抑制了转子经过临界转速的基频振动(幅值最大降低了62.18%);ERSFD供油后会在转子系统中引入额外的刚度和阻尼,其综合效果表现为转子的临界转速较ERSFD不供油的状态下,1阶临界转速降低2.39%。
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关键词:
- 突加不平衡 /
- 弹性环挤压油膜阻尼器 /
- 瞬态响应 /
- 临界转速 /
- 减振效果
Abstract:In order to study the suppression effect of elastic ring squeeze film damper (ERSFD) on vibration of rotor system under transient impact (sudden unbalance), the rotor dynamics experiment rig with ERSFD was designed and assembled to carry out the experiment of sudden unbalance and obtain the experimental results of the spectrum response at the speed up and down of the rotor under oil free and oil supply states. Results showed that ERSFD can effectively suppress the fundamental frequency vibration at the critical speed and transient response caused by sudden unbalance, and reduce the vibration amplitude at critical speed and additional vibration by 62.18% and 74.39% respectively; the combined effect indicated that the first critical speed of the rotor was 2.39% lower than that of the ERSFD oil free when additional stiffness and damping were introduced into the rotor system.
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表 1 15号航空液压油主要参数
Table 1. Principal parameters of 15# aviation hydraulic oil
参数 数值 密度$ \rho / $(kg/$ {\mathrm{m}}^{3} $) 872 动力黏度$ \mu / $(Pa·s) 0.0195 表 2 挤压油膜阻尼器参数
Table 2. Squeeze film damper parameters
参数 数值 阻尼器内环直径/mm 106.6 油膜长度/mm 24 供油压力/MPa 0.3 内(外)油膜厚度/mm 0.16(0.16) 弹性环厚度/mm 1 内(外)凸台高度/mm 0.16(0.16) 内(外)凸台数量 6(6) 内(外)凸台宽度/mm 6(6) 表 3 阻尼器无油与供油时1阶临界转速处基频振幅
Table 3. Fundamental frequency vibration amplitude at first critical speed of the damper with oil free and supply
实验条件 1阶临界转速处基频振动幅值/μm x方向 y方向 阻尼器无油
(转速为2419 r/min)31.2 46.2 阻尼器供油
(转速为2361 r/min)11.8 23.4 表 4 阻尼器无油与供油时突加不平衡处基频振幅
Table 4. Fundamental frequency vibration amplitude at condition of sudden unbalance for the damper with oil free and supply
实验条件 突加不平衡引起额外基频振动幅值/μm x方向 y方向 阻尼器无油
(转速为2910 r/min)304.6 302.2 阻尼器供油
(转速为3020 r/min)78.0 94.0 -
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