压电实验室丁曙东和沈耀东同学获得压电会议优秀论文奖
在2019年1月11-14日举行的第13届全国压电和声波理论及其器件应用研讨会上，压电实验室的丁曙东和沈耀东获得会议优秀论文奖。据悉，此次会议优秀论文奖获奖人数总共为10人，参与优秀论文竞赛的研究生近40人。这也是压电实验室连续第三年获得此项殊荣。
丁曙东同学此次报告的题目为"In-Plane Free Vibrations of Curved Beams With Rayleigh-Ritz Method"。近年来，随着多孔材料、超材料和声子晶体研究的深入，周期结构材料应用日益广泛，而周期结构材料的振动分析也就成了一个重要的内容。丁曙东同学的研究思路是从三维结构退化到二维，再退化到一维问题，得到最简单的曲梁结构。他利用瑞利-里兹法分析了正弦曲梁的振动，讨论了正弦曲梁的振幅、周期数对频率的影响，为之后高维周期结构的振动分析提供了基础。这一方法可用于任意曲线形式的梁及其组合结构。沈耀东同学在这次会议报告的题目为"The Irradiation effect of Quartz Crystal Resonators by Picosecond Laser"。石英谐振器中晶体板的生产中，往往需要倒边角来抑制弯曲振动模态，但是现有倒边方式是将晶片放入滚筒旋转来磨掉边沿，这种方式效率很低。沈耀东同学采用了皮秒激光器照射晶片边缘，通过激光高能量烧蚀部分晶体的方式来使边缘变薄。他进行了2000块晶片的实验，发现激光倒角也具有抑制弯曲模态的结果，并且不会造成其它参数显著变化，而且具有效率更高的特点。
全国压电和声波理论及器件技术研讨会(Symposium on Piezoelectricity, Acoustic Waves, and Device Applications, SPAWDA)是从2004年起开始酝酿召开的以压电理论和声波器件以及医学超声为核心内容的学术交流平台，主要的发起人是宁波大学的王骥教授和浙江大学的陈伟球教授，得到浙江大学丁皓江教授、鲍亦兴院士以及其他诸多院校同仁们的热情鼓励和大力支持。此次会议于2019年1月11日至1月14日在黑龙江省哈尔滨市召开，由中国力学学会、中国声学学会、IEEE等学术组织主办，由哈尔滨工程大学、中国地震局工程力学研究所、先进船舶材料与力学重点实验室联合承办，近300人参加了这次会议，其中不乏国内外著名高校和企业的专业技术人员。
At the 13th Symposium on Piezoelectricity, Acoustic Waves, and Device Applications, Janurary 11-14, 2019, Shudong Ding and Yaodong Shen of Piezoelectric Device Laboratory, Ningbo University, won the student best paper award which are given to 10 students. This is also the third consecutive year that the Piezoelectric Device Laboratory has won this prestigious award.
Shudong Ding’s presentation is entitled “In-Plane Free Vibrations of Curved Beams With Rayleigh-Ritz Method”. In the recent years, with the in-depth study of porous materials, metamaterials, and phononic crystals, the periodical materials and their vibration analysis of became an urgent agenda. Simplifying the problem from 3D to 1D, Shudong Ding considered the most simple sinuous curved beam model. He analyzed the influence of amplitude and the spans of curved beams on the vibration frequency and modes by Rayleigh-Ritz method. With combination of simple models, more complicated curved beams of 2D and 3D applications can be analyzed precisely and fast. Yaodong Shen’s presentation is entitled “The Irradiation effect of Quartz Crystal Resonators by Picosecond Laser”. In the fabrication of the crystal plate of quartz resonator, the wafers need to be beveled to restrain the vibrations of flexural mode. However, the traditional beveling method is inefficient. Yaodong Shen processed the wafer through the irradiation of picosecond laser. When picosecond laser irradiates on the edge of the wafer, part of material is burned by the high temperature and the edge become thinner than the middle of the wafer. With tested wafers in experiment, it is found the flexural mode is restrained too. Clearly, this method is much faster than mechanical technique.
The Piezoelectric Device Laboratory has been actively organizing and participating the SPAWDA from the beginning. The conference has provided an excellent opportunity for the students and faculty members to showcase creative work and form closer relations with industry.
