| 镁合金AZ31阻尼性能的实验研究 |
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| 引用本文： | 陈馨蕊,郝志勇,杨陈.镁合金AZ31阻尼性能的实验研究[J].浙江大学学报(自然科学版 ),2010,44(1):19-22. |
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| 作者姓名： | 陈馨蕊 郝志勇 杨陈 |
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| 作者单位： | 浙江大学机械与能源工程学院; |
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| 基金项目： | “十一五”国家科技支撑计划重点资助项目(2006BA104B04-2); 国家自然科学基金资助项目(10672141) |
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| 摘 要： | 采用脉冲响应衰减法研究镁合金AZ31的减振降噪效果.由脉冲激励激发镁合金薄板自由振动,测得镁合金薄板表面的辐射声压,将声压信号进行带通滤波,分离出薄板各个简正振动对应的辐射声压,或分析带宽内几个简正振动产生的复合声压,将该声压信号曲线进行多项式拟合,由拟合曲线的斜率得出镁合金的阻尼损耗因子,并与钢的阻尼性能进行比较.结果表明,镁合金的阻尼损耗因子随频率的增大逐渐减小,在660、1090、1230和1760Hz处存在阻尼峰值,是减振性能最佳的频率.在中低频段,镁合金的阻尼性能约为钢的2、3倍.镁合金构件在使用中必将体现出良好的抗冲击和减振降噪性能.
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| 关 键 词： | 镁合金 脉冲响应衰减法 声压信号 阻尼 |
Experimental study on damping performance of magnesium alloy AZ31 |
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| CHEN Xin-rui,HAO Zhi-yong,YANG Chen.Experimental study on damping performance of magnesium alloy AZ31[J].Journal of Zhejiang University(Engineering Science),2010,44(1):19-22. |
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| Authors: | CHEN Xin-rui HAO Zhi-yong YANG Chen |
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| Affiliation: | (College of Mechanical and Energy Engineering, Zhejiang University, Hangzhou 310027, China) |
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| Abstract: | Vibration damping and noise reduction effects of magnesium alloy AZ31 was researched with the impulse response decay method (IRDM).The free vibration of magnesium alloy sheet was excited by a pulse excitation,and the sound pressure near the magnesium alloy sheet was measured.The radiated sound pressure due to one normal vibration mode or the complex sound pressure due to few normal vibration modes in one frequency band was isolated by a band-pass filter from the measured sound pressure signals.The damping l... |
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| Keywords: | magnesium alloy impulse response decay method sound pressure signal damping |
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