摘要
结合共振法与基于直达波提取的波速法,实现水中加压条件下黏弹性材料连续宽频范围的动态力学参数测试。搭建可实现水下加压的压力舱测试系统,以短时宽带脉冲作为测试激励信号,利用激光测振仪采集细棒激振端与自由端的纵向振动速度信号。一方面以共振法计算共振频率处的力学参数,另一方面提取直达波信号,以波速法计算宽频范围的力学参数,二者测试结果吻合良好,验证了本方法的有效性。本文测试方法适用于水下加压条件,有效测试频带范围宽,测试效率高。
Combining the resonance method and the direct wave extracting method,the dynamic mechanical parameters of viscoelastic materials in a continuous and wide frequency range under controllable water pressure were measured.A pressure chamber test system capable of realizing underwater pressurization was built,a short time broadband impulse generated by an electromagnetic shaker was employed to excite a barlike sample attached inside the pressure vessel.On one hand,the resonance method was used to calculate the mechanical parameters at resonance frequencies while on the other hand,the direct wave signal was extracted,and the mechanical parameters in a wide frequency range were calculated by the wave velocity method.The broadband mechanical parameters(including the storage modulus and loss factor)under variable water pressure conditions(0.1-6 MPa)for two types of viscoelastic materials were obtained.The experimental results agree well with each other,proving the test method in this paper could directly determine the Young’s modulus at frequencies ranging from 500 Hz to 5000 Hz under variable water pressure.This method provides simplified processing for underwater dynamic mechanical parameter measurements.
作者
刘哲
张子璇
张杰
侯宏
LIU Zhe;ZHANG Zi−xuan;ZHANG Jie;HOU Hong(Northwestern Polytechnical University,Xi’an 710072,China)
出处
《船舶力学》
北大核心
2025年第8期1271-1276,共6页
Journal of Ship Mechanics
基金
国家自然科学基金资助项目(12174314)。
关键词
水下加压
动态力学参数测试
直达波提取
共振法
controllable water pressure
dynamic mechanical parameter
direct wave extracting
resonance method
