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悬臂梁式准零刚度动力吸振系统实验研究*
Experimental Study of Cantilever Beam Quasi-zero Stiffness Vibration Absorption System
投稿时间:2023-08-18  修订日期:2023-09-29
DOI:
中文关键词:  准零刚度  动力吸振系统  动态响应  反共振  缓冲性能
英文关键词:quasi-zero-stiffness  dynamic vibration absorption system  dynamic response  anti-resonance  cushioning performance
基金项目:
作者单位邮编
任连岭 军事科学研究院系统工程研究院 102300
刘彦琦 北京市科学技术研究院城市安全与环境科学研究所 100054
汪新 江南大学 214122
宋春芳* 江南大学 214122
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中文摘要:
      为实现对某既定频率激励的有效隔离和进一步拓宽低频隔振带宽,提出了一种滑块悬臂梁式准零刚度动力吸振系统。首先,理论分析悬臂梁滑块子系统的刚度和固有频率可调的原理,进而探讨了结构参数对其固有频率的影响,并采用ABAQUS进行了系统模态分析。然后,搭建悬臂梁式准零刚度吸振模型实验平台,进行了正弦谐波扫频、正弦定频以及半正弦冲击实验, 实验分析了系统的固有特性、吸振性能以及抗冲击性。此外,对比分析了悬臂梁式准零刚度动力吸振器与准零刚度隔振器的动态响应。研究结果表明:动力吸振子系统的响应峰值均大于主系统响应峰值,由于反共振特性使主系统上的振动能量转移到动力吸振子系统上,从而减小了主系统的振动;同时,相较于准零刚度隔振系统,吸振系统的起始隔振频率和响应峰值均相应减小。当外激励频率对应于子系统固有频率时,系统具有明显吸振性能。另外,对于脉宽小于15 ms、冲击激励小于7 g半正弦加速度冲击,悬臂梁式准零刚度动力吸振模型具有良好缓冲性能。
英文摘要:
      In order to achieve effective isolation of a given frequency excitation and further broaden the bandwidth of low frequency vibration isolation, a quasi-zero stiffness dynamic vibration absorption system with a sliding block cantilever beam is proposed. Firstly, the principle of adjusting the stiffness and natural frequency of the cantilever beam-sliding block subsystem is analyzed theoretically, and then the influence of structural parameters on the natural frequency is discussed, and the modal analysis is carried out by ABAQUS. Then, the experiment platform for cantilever beam quasi-zero stiffness vibration absorption model is set up, and the experiments of sinusoidal harmonic sweep frequency, sinusoidal fixed frequency and half-sinusoidal impact are carried out, and the inherent characteristics, vibration absorption performance and impact resistance of the system are analyzed. Moreover, the dynamic responses of the cantilever beam quasi-zero stiffness vibration absorption system are compared with that of the quasi-zero stiffness isolation system. The results show that the response peaks of the subsystem are greater than those of the main system, which indicates that the vibration energy of the main system is transferred to the subsystem due to the anti-resonance characteristics, thus reducing the vibration of the main system. Meanwhile, compared with the quasi-zero stiffness isolation system, the initial isolation frequency and response peak value of the system are reduced correspondingly, which is consistent with the theoretical analysis results. When the excitation frequency corresponds to nature frequency of subsystem, the system exhibits obvious vibration absorption performance. In addition, when the pulse width is less than 15ms and the shock excitation is less than 7g half-sinusoidal acceleration shock, the cantilever beam quasi-zero stiffness dynamic vibration absorption system has better cushioning performance.
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