[Oral Presentation]颗粒-梁系统非线性动力学的理论与实验研究

Organized By

Hohai University

Monash University

Co-organized by

Southeast University

Jiangxi University of Science and Technology

Northeast University

DUT-BSU Scientific Research and Innovation Center

Suzhou University of Science and Technology

State Key Laboratory of Structural Analysis, Optimization and CAE Software for Industrial Equipment

Sponsoring agency

KELI SDEM Software (Dalian) Co., Ltd.

Sugon Smart Computing Information Technology Co., Ltd.

Beijing Paratera Technology Co., Ltd.

Simpop Information Technology Co., Ltd.

Important Dates

Conference Announcement

December 2023, release First Round Announcement
Abstract Submission Deadline
March 31^th, 2024
Paper Submission Deadline
April 30^th, 2024
Registration
From January 1^st, 2024
Conference Schedule
May 31^st (Friday), 2024 On-Site Registration
June 1^st to 3^rd, 2024 Conference

颗粒-梁系统非线性动力学的理论与实验研究

ID：134 Submission ID：133 View Protection：ATTENDEE Updated Time：2024-04-10 17:16:46 Hits：417 Oral Presentation

Start Time：Pending （Asia/Shanghai）

Duration：Pending

Session：[No Session] » [No Session Block]

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Abstract

通过实验研究了浸没在颗粒介质中的简支梁系统，在简谐激励下，其幅频曲线出现新的峰值和跳跃现象。采用离散元法研究了颗粒介质宏观非线性响应与微观状态之间的关系。利用动态模量和振动态密度作为指标，发现当频率增加到接近跳跃点时，颗粒介质从类固态转变为类液态。考虑到该系统与声学超材料梁的相似性，建立了声学超材料梁等效理论模型。该理论模型的数值计算结果与实验结果吻合较好。结果表明，新的峰值和跳跃现象是由颗粒介质的负等效质量、负等效刚度和阻塞相变引起的附加刚度突变引起的。该理论模型有助于研究该耦合颗粒-梁系统的非线性动力学特性。

Keywords

颗粒-梁,离散单元法,阻塞相变,跳跃现象,负有效刚度

Speaker

宁阳

东北大学

Submission Author

宁阳东北大学

洪广洋东北大学

李健东北大学

董金录东北大学

Sponsored By

Hohai University

Panel of Computational Mechanics on Granular Materials, Working Party of Computational Mechanics, Chinese Society of Theoretical and Applied Mechanics

Jiangsu Society of Theoretical and Applied Mechanics