Vibration Reduction Characteristics of Sandwich Constrained Damping Gasket for Diaphragm Air Pump
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摘要: 隔膜抽气泵在运转过程中会产生振动,使用阻尼垫片可以有效减小其振动。设计并制备了一种三明治约束阻尼垫片,其约束层使用铝合金,阻尼层采用黏弹性材料。通过时域和频域响应分析对比了三明治约束阻尼垫片安装前后隔膜泵的振动响应,发现该垫片能够以4 mm(或传统的1/10)厚度实现良好的减振效果,提高了系统的稳定性。与此同时,本文还从材料和结构的角度分析了三明治约束阻尼垫片的减振机理。Abstract: Diaphragm air pump will produce vibration during operation. The constrained damping gasket (SCDG) can effectively reduce the vibration of the diaphragm air pump. A SCDG is designed and prepared in this paper, in which the aluminum alloys as the constrained layer and the viscoelastic materials as the damping layer. The vibration response of the diaphragm air pump with and without SCDG was compared through the time-domain and frequency-domain response. It is found that the SCDG can achieve good damping effect with 4 mm (or 1/10 thickness of traditional gaskets) as the thickness, thus improving the stability of the system. At the same time, the damping mechanism of SCDG is analyzed from the aspects of material and structure.
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Key words:
- diaphragm air pump /
- SCDG /
- time-domain response /
- frequency-domain response /
- damping mechanism
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表 1 25 Hz及其倍频下沥青板的阻尼系数
Table 1. Damping coefficient of asphalt plate at 25 Hz andits frequency doubling
频率/Hz 样品1 样品2 样品3 平均值 25 0.652 0.654 0.672 0.659 50 0.661 0.646 0.676 0.661 75 0.258 0.224 0.184 0.222 100 0.622 0.614 0.655 0.630 表 2 泵身加速度振幅均值表
Table 2. Pump body acceleration amplitude mean table
m/s2 方向 无垫片
振幅三明治垫片 橡胶悬置垫片 振幅 减振/% 振幅 减振/% x 4.532 1.734 61.74 5.643 −24.51 y 1.522 0.845 44.48 0.899 40.93 z 3.640 1.135 68.82 1.409 61.29 表 3 机脚加速度振幅均值表
Table 3. Foot acceleration amplitude mean table
m/s2 方向 无垫片
振幅三明治垫片 橡胶悬置垫片 振幅 减振/% 振幅 减振/% x 2.385 0.568 76.18 0.486 79.62 y 2.459 1.626 33.88 1.172 52.34 z 6.716 1.260 81.24 0.906 86.51 -
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