摘要
针对某新批次风机出现振动和噪声超标等问题,应用AVANT-7008大型数据采集分析仪,对风机的整机、外框和网罩在不同转速工况下的振动时域和频域特性进行了研究,对风机组件进行自由悬挂模态试验的关键技术进行了归纳,提出了一种多传感器三轴向振动噪声采集和分析试验方法;同时结合Modal Genius模态仿真分析软件,根据实际传感器安放位置确定了模型数据驱动点,对风机外框自由悬挂模型的模态特性进行了研究,得到了外框的固有频率和主振型,分析了外框结构的主要脆弱点。研究结果表明:影响风机振动较大的频率范围为280 Hz^300 Hz之间及频率23.13 Hz附近(风机转速1400 r/min时);横向振动比纵向振动幅度要大,且外框结构脆弱位置改进后,在X,Y和Z向上的振动噪声明显降低,验证了设计的模态试验方案的有效性。
Aiming at the problems of vibration and noise exceeding the standard of a new batch of fans,the AVANT-7008 data acquisition analyzer was used to analyze the vibration time and frequency domain characteristics of the whole machine,outer frame and net cover of the fan under different speed conditions,the key techniques of free suspension modal test of the fan assembly were summarized.A multi-sensor triaxial vibration noise acquisition and analysis test method was proposed.The Modal Genius modal simulation analysis software was used to study the modal characteristics of the fan frame free suspension model,model data driving point was determined according to the actual sensor placement position,the modal characteristics of the free suspension model of the fan frame was studied,natural frequency and main mode of the frame was obtained.The results show that the frequency range that affects the vibration of the fan is between 280 Hz and 300 Hz and the frequency around 23.13 Hz(when the fan speed is 1400 r/min),the lateral vibration is larger than the longitudinal vibration amplitude,and the vibration structure of the outer frame structure with improved fragile position is significantly reduced in the X,Y and Z directions,which verifies the effectiveness of the designed modal test scheme.
作者
梅阳寒
张文龙
樊开夫
杨卫平
MEI Yang-han;ZHANG Wen-long;FAN Kai-fu;YANG Wei-ping(Department of Mechanical and Electrical Engineering,Dongguan Polytechnic,Dongguan 523808,China;Dongguan Quality Testing,Dongguan 523808,China;Jiangxi Agricultural Mechanization Technology Extension Monitoring Station,Nanchang 330000,China)
出处
《机电工程》
CAS
北大核心
2019年第11期1147-1152,共6页
Journal of Mechanical & Electrical Engineering
基金
广东省教育厅科研项目(2017GkQNCX117)
国家质量监督检验检疫总局科技计划项目(2017QK149)
关键词
振动特性
模态试验
锤击激励
固有频率
加速度传感器.
vibration characteristics
modal test
hammer excitation
natural frequency
acceleration sensor
作者简介
梅阳寒(1983-),男,江西南昌人,硕士,讲师,主要从事机械工程及加工检测技术方面的研究。E-mail:158304974@qq.com。
