空调柔性管路模态测试与优化
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摘要
工程应用中空调管路柔性较大,并常伴有非线性,因而模态不易测试准确。本文用激振器法测试了空调管路的模态,并利用有限元法进行了模拟仿真,辅助确定测点数目和激励点位置。然后应用PolyMAX进行结构模态分析,并对管路整改提出了解决方案。实验证明激振器可以较好的激励起各阶模态,输入激励和输出响应相干性较好;测试结果与仿真误差在7.63%以内,测试数据可信度较高;利用阻尼块、管固定块等可以调整管路的固有频率和响应,有效提高管路的可靠性。
Air conditioning pipeline is flexible with nonlinear characteristics, so modal analysis is hard to be tested accurately. In this paper, vibration exciter method was performed to test the mode of the air conditioning pipeline, and Finite Element Method(FEM) was carried out to assist in determining the number of sensor and the position of the excitation point. Pipeline structure optimization is proposed after modal analysis using PolyMAX. The experiment result proves that the vibration exciter can better excite various modes and coherence between input excitation and output response get improved compared to which without using vibration exciter. The error between simulation and test natural frequency is below 7.63 % in all modes, so the simulation has high credibility. The reliability of the pipeline can be effectively improved by adjusting the position of damping block and tube fixing block, etc.
Air conditioning pipeline is flexible with nonlinear characteristics, so modal analysis is hard to be tested accurately. In this paper, vibration exciter method was performed to test the mode of the air conditioning pipeline, and Finite Element Method(FEM) was carried out to assist in determining the number of sensor and the position of the excitation point. Pipeline structure optimization is proposed after modal analysis using PolyMAX. The experiment result proves that the vibration exciter can better excite various modes and coherence between input excitation and output response get improved compared to which without using vibration exciter. The error between simulation and test natural frequency is below 7.63 % in all modes, so the simulation has high credibility. The reliability of the pipeline can be effectively improved by adjusting the position of damping block and tube fixing block, etc.
引文
[1]曹树谦,张文德,萧龙翔.振动结构模态分析--理论、实验与应用[M].天津:天津大学出版社,2001.
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[2]Wang R F,Yao H S,Xiong S B.Research on Largescale Vibrating Screen Dynamic Parameters Based on Test Modal Analysis Technology[C]//Proceedings of the 5th International Symposium on Test and Measurement.Shenzhen,2003:763-766,
[3]董小瑞,杨世文.复杂结构模态测试方法研究[J].兵工学报,2008(4).
[4]薛玮飞,张智,等.空调配管空间结构的动态仿真与优化[J].机械强度,2011(02):170-174.
[5]陈超宇,林建中,胡静.空调配管动态特性研究[J].电子科技,2017(9):112-116.
[6]宋纪侠,王彦,章睿,等.白车身模态试验与模态仿真对标研究[J].试验·测试,2016(4):83-86.
[7]洪亮,刘成武,黄键.模态测试技术在汽车零部件振动分析中的应用[J].福建工程学院学报,2012(1):50-53.
[8]王雪仁,缪旭弘,贾地,等.多源激励作用下结构的振动响应的试验研究[J].振动与冲击,2011,30(3):246-251.
[9]王佳,潘宏侠,杨晓波.基于PolyMAX法的齿轮箱试验模态分析[J].机械传动,2013(02):66-69+75.
[10]荣双飞,李传日,徐飞,等.试验模态分析最佳测试点选取方法的优化[J].北京航空航天大学学报,2014,40(4):536-543.
[11]谭博欢,李越峰,李冬,等.空调配管理论模态分析与试验研究[J].机械科学与技术,2016(35).
[12]郭亚娟.空调配管系统的减振研究与阻尼优化设计[D].上海:上海交通大学:机械系统与振动国家重点实验室,2009.
[13]庞剑,等著.汽车噪声与振动-理论与应用[M].北京:北京理工大学出版社,2006.