Design and Experimental Study on Vibration Isolation System of Medium Power Turboprop Engine
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摘要: 针对涡桨飞机发动机振动严酷的问题, 利用氢化丁腈橡胶设计了一种中功率涡桨发动机减振系统, 基于Workbench ANSYS软件研究了含橡胶实体单元的减振系统动力学建模分析方法; 再以加速度传递率为隔振性能评价准则, 设计了中功率涡桨发动机减振性能试验系统, 通过试验研究减振系统的减振性能。结果表明: 在小变形假设下利用橡胶材料硬度估算其弹性模量, 由线弹性模型模拟橡胶材料开展减振系统动力学仿真分析, 仿真分析结果与扫频试验结果误差小于10%;通过随机振动试验测得减振系统对发动机1阶窄带激励的隔振效率大于70%, 对2阶窄带激励的隔振效率大于85%, 设计的减振系统对发动机窄带激励具有优良的隔振效果。Abstract: Aiming at the severe vibration problems of turboprop aircraft engine, a medium power turboprop engine damping system was designed by using hydrogenated nitrile rubber (HNBR). By using the workbench ANSYS software, the dynamic modeling analysis method of the damping system with rubber solid element was studied. Then, taking the acceleration transmissibility as the evaluation criterion of vibration isolation performance, a medium power turboprop engine vibration reduction performance test system is designed, and the vibration reduction performance of the vibration reduction system is studied through the test method. The results show that under the assumption of small deformation, the elastic modulus of rubber material is estimated by the hardness of rubber material, and the dynamic simulation analysis of the damping system is carried out by simulating the rubber material with linear elastic model, and the difference between the simulation analysis results and the frequency sweep test results is below 10%; through the random vibration test, the vibration isolation efficiency of the damping system for the first-order narrow-band excitation of the engine is above 70%, and the vibration isolation efficiency for the second-order narrow-band excitation is above 85%. The designed damping system has the excellent vibration isolation effect for the narrow-band excitation of the engine.
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表 1 模态计算结果
Table 1. Results on model calculation
阶数 模态频率/Hz 振型 1 18.3 绕y轴俯仰振动 2 21.1 绕z轴偏摆振动 3 30.4 沿z轴振动 4 39.4 沿y轴振动 5 55.2 绕x轴转动 6 89.1 沿x轴振动 表 2 仿真与试验误差分析
Table 2. Error analysis of simulation and experiment
名称 x向 y向 z向 谐振点频率 放大倍数 谐振点1频率 放大倍数 谐振点2频率 放大倍数 谐振点1频率 放大倍数 谐振点2频率 放大倍数 模态分析结果 89.1 Hz 21.1 Hz 39.4 Hz 18.3 Hz 30.4 Hz 沿x轴振动 绕y轴俯仰振动 沿y轴振动 绕z轴偏摆振动 沿z轴振动 扫频仿真结果 90.0 Hz 8.9 19.0 Hz 2.3 32.5 Hz 3.7 20.0 Hz 5.8 30.0 1.1 扫频试验结果 87.1 Hz 9.6 20.6 Hz 2.4 35.2 Hz 4.1 20.9 Hz 6.4 28.3 0.8 误差 3.3% -7.3% -7.8% -4.2% -7.7% -9.8% -4.3% -9.4% 6.0% 37.5% 表 3 隔振效率试验结果
Table 3. Test results on vibration isolation efficiency
名称 x向 y向 z向 1阶窄带激励 2阶窄带激励 1阶窄带激励 2阶窄带激励 1阶窄带激励 2阶窄带激励 激励均方根值/g 2.025 18 2.886 93 1.812 65 3.394 91 2.230 21 2.506 97 测点1均方根/g 0.601 49 0.342 18 0.419 04 0.052 17 0.132 03 0.227 83 测点2均方根/g 0.388 92 0.104 681 0.041 666 0.164 84 0.473 54 0.129 73 测点1减振效/% 70.2 88.1 76.9 98.5 94.1 90.9 测点2减振效/% 80.8 96.4 97.7 95.1 78.7 94.8 -
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