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提出了一种新型纵扭复合超声振动系统的设计方法,并应用有限元软件对其正确性进行仿真验证。利用矩阵传输理论得出了指数过渡变幅杆的纵扭共振频率方程及放大倍数,其间利用MATLAB软件对此频率方程进行了求解;然后通过对圆棒中有纵扭复合振动时的应力状况进行分析,得出了一种新型的纵扭同频激励方式。按此法设计纵扭复合超声振动系统,并应用有限元软件ANSYS进行模态分析与瞬态动力学分析。结果表明:有限元分析与理论计算结果吻合较好。 相似文献
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为了避免加工过程中碳/碳化硅复合材料的异形、深腔燃烧室构件出现分层、撕裂和毛刺等缺陷,提出一种超声辅助锉削加工系统。首先基于多级放大原理,应用传输矩阵法,推导了多级变幅杆的频率方程,并利用MATLAB7.1软件对该频率方程进行求解,实现了多级变幅杆的超声振动;基于薄板弯曲振动原理,应用ANSYS Workbench软件对带有直槽的锉削刀具进行结构优化设计,实现了锉削刀具的超声振动;之后,分别对设计和制造出的超声辅助锉削系统进行有限元分析与振动特性测试,结果显示二者与理论分析结果较好的一致性,谐振频率的误差在0.68%~1.75%。最后,利用研制的超声锉削系统对超声速推进器燃烧室进行切削试验,获得了较好的加工效果。 相似文献
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模态综合法在双转子系统建模中的应用与验证 总被引:3,自引:0,他引:3
为寻求一种便捷的双转子系统的建模和模型维数缩减方法,开展了ANSYS有限元商用软件和固定界面模态综合法在双转子系统中建模中的应用研究。由ANSYS获取系统的质量矩阵和刚度矩阵,建立系统的运动方程,并利用固定界面模态综合法实现系统方程维数的缩减。利用模态质量矩阵和模态刚度矩阵的特性验证了系统参数的正确性;进行了系统临界转速特性计算,利用ANSYS软件(有限元方法)计算结果进行了对比验证,并分析了模态截止频率对临界转速的影响;开展了双转子系统的匀变速过程的瞬态分析,进行了试验验证。结果表明:建模方法正确、可靠,并能便捷地进行双转子响应特性的计算。 相似文献
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Cymbal压电换能器发电性能的有限元仿真分析 总被引:1,自引:0,他引:1
应用有限元法研究结构参数对cymbal换能器性能的影响.首先,以压电方程为基础,应用有限元理论对cymbal换能器进行有限元建模,得出有限元动力学方程.然后应用ANSYS分析了cymbal换能器结构参数对其发电电压和谐振频率的影响.结果表明,为达到更好的发电电压,应该增加cymbal压电陶瓷的厚度tp,增加金属帽内腔底径φc,减少金属帽厚度tm和内腔顶径φd,对每个cymbal系统都存在一个最优的内腔高度dc.基振频率随着tm、dc增加而增加,随φc增加而减少. 相似文献
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将超声珩齿加工变幅杆和被加工齿轮组成的超声振动系统简化为变幅器,基于圆锥形变幅杆和环盘(被加工齿轮)组成变幅器的频率方程,导出齿轮半径、厚度变化对谐振频率的影响,以及变幅杆的调整规律,并运用有限元分析的方法对设计结果进行了验证,从而为变幅杆及工作频率的设计选择提供了依据。 相似文献
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为了将超声颗粒操纵技术应用于血管中纳米药物颗粒聚集,笔者针对液体流速因素的影响和纳米颗粒由于纳米效应存在的自发团聚现象,基于压电方程、声-结构边界耦合方程、动量方程,利用COMSOL有限元软件建立了流速扰动聚焦超声下颗粒聚集的理论计算模型.通过仿真计算和实验结果对比分析,得到了聚焦超声聚集纳米颗粒的原因、纳米颗粒团簇介... 相似文献
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The difficulties occur when traditional level gauging instruments are applied in filling processes, because dust above the interface of material will affect the accuracy of these gauging instruments. A non-destructive method using ultrasonic sensors was proposed in this work to meet this challenge. Theoretical model of ultrasonic radiation damping was derived on the basis of vibration damping theory, and the model was used to describe the relationship between the dissipation of ultrasonic vibration energy and material level. Moreover, influences of frequency and amplitude of the ultrasonic signal on the model were investigated. The results show that the frequency instead of the amplitude has a big influence on the model. Base on these results, proper amplitude and frequency of the ultrasonic signal is decided for the industrial trial in a pulverized coal silo. The predicted level obtained using the model gives error less than 5%. Conclusions can be drawn that the non-destructive ultrasonic method enjoys a bright future in the measurement of material level. 相似文献
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从变截面杆作一维纵振动的运动方程出发,建立机械四端网络的数学模型及传输特性方程,导出了超声珩齿复合振动系统的频率方程和放大系数计算公式。将小端接圆柱杆的复合圆锥形变幅杆与被加工齿轮组成复合振动系统,将齿轮简化为圆柱杆,采用四端网络方法,得出了复合振动系统的频率方程与放大系数公式。 相似文献
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An object transport system is an essential device in the factory automation system (FAS). Generally, an object transport system
is driven by a conveyor belt system or a magnetic levitation system. However, contact force in the conventional transport
system can damage precision optical components, while the magnetic field can destroy the inner structure of the semiconductor.
The ultrasonic transport system transports objects on an elastic body using an ultrasonic wave. When an ultrasonic wave is
applied to a flexural beam, the flexural beam vibrates to excite the air layer, which lifts up the object on the beam to transport.
In this paper, the dynamic characteristics of the ultrasonic transport system are theoretically analyzed. Through normal mode
expansion, the modeling equation for steady state response of ultrasonic vibration is expressed and the natural frequency
of the flexural beam in each mode is also estimated by using the finite element method (FEM).
This paper was recommended for publication in revised form by Associate Editor Eung-Soo Shin
Sang-Hwa Jeong received his M.S. degree in Mechanical Engineering from KAIST, Korea, in 1985 and his Ph.D. degree from North Carolina State
University, USA, in 1992. Dr. Jeong is currently a professor at the department of Mechanical Engineering of Chosun University
in Gwangju, Korea. His research fields are microactuator design, ultrasonic transport system, and SMA actuator of robot finger. 相似文献