摘要
随着电声装置逐渐向微型化方向发展,对超磁致伸缩换能器(GMA)的输出位移和形状尺寸等提出了更高要求。为此,设计一种弓张式位移放大机构,旨在增大GMA的输出位移并实现小型化设计。通过理论推导建立了弓张结构的分析模型,得到了其位移放大比随主支臂参数变化的规律;将仿真结果与理论结果进行比较,分析了误差来源,并确定了最佳位移放大比下的主支臂参数;最后,通过有限元仿真研究了主支臂形状变化对位移放大比的影响。结果表明:优化后的主支臂参数满足了电声换能器小型化设计要求,放大机构整体尺寸为15.8 mm(长)×8.6 mm(高)×4.0 mm(厚),位移放大比为9.87,与实际值的误差在5.2%内;可从主支臂与水平夹角来判断梯形体结构是否适用于弓张结构的主支臂形状,夹角越小,位移放大比越大,椭圆形的支臂结构有利于提高位移放大比。
With the development of electro-acoustic devices in the direction of miniaturization,higher demands are placed on the giant magnetostrictive actuator(GMA)in terms of output displacement and shape and size.To address these challenges,a bow-type displacement amplification structure was designed to increase the output displacement of the GMA while achieving miniaturization.An analytical model of the bow-type structure was established by using theoretical derivation,and the change rule of its displacement amplification ratio with the parameters of main support arm was obtained.The simulation results were compared with the theoretical results,the sources of error were analyzed,and the parameters of the main support arm under the optimal displacement amplification ratio were determined.Finally,the influence of the shape change of the main arm on the displacement amplification ratio was studied by finite element simulation.The results show that the optimized parameters of the main support arm meet requirements for miniaturized design of the electroacoustic transducer.The overall dimensions of the amplification mechanism are 15.8 mm(length)×8.6 mm(height)×4.0 mm(thickness),with a displacement amplification ratio of 9.87,and the error compared to the actual value is within 5.2%.Whether the trapezoidal structure is suitable for the shape of the main arm of the bow-type tension structure can be judged from the angle between the main arm and the horizontal,and the smaller the angle is,the greater the displacement amplification ratio is.The elliptical arm structure is conducive to improving the displacement amplification ratio.
作者
闫洪波
刘怡雯
马庆振
韩世发
张天辉
YAN Hongbo;LIU Yiwen;MA Qingzhen;HAN Shifa;ZHANG Tianhui(School of Mechanical Engineering,Inner Mongolia University of Science&Technology,Baotou Inner Mongolia 014010,China)
出处
《机床与液压》
北大核心
2025年第8期192-196,共5页
Machine Tool & Hydraulics
基金
国家自然科学基金地区科学基金项目(52266005)。
关键词
超磁致伸缩换能器
放大机构
小型化设计
ANSYS有限元仿真
giant magnetostrictive actuator
amplifying mechanism
miniaturized design
ANSYS finite element simulation
