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      Simulations of the unsteady fluid-structure coupling characteristics of a conical orifice valve

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          Abstract

          The dynamics of a conical orifice valve in a heavy-duty vehicle damper were analyzed using 3-D fluid-structure coupling finite element models solved using the direct coupling computational method. The results show the internal 3-D transient fluid pressure and velocity distributions for transient inlet flow rates and the unsteady high-frequency fluctuations of the valve opening and the forces on the valve. The dynamic responses are given for various compression spring characteristics, valve structure parameters and inlet flow rates to understand the fluid-structure coupling self-excited vibrations of the valve. The results show that heavily preloaded valve springs and small inlet flow rates lead to high-frequency fluctuations of the valve opening and collisions of the core onto the seat. In addition, a zero preload of the valve spring eliminates the fluid-structure coupling vibrations and large inlet flow rates reduce the unsteady opening fluctuations. These conclusions are important for understanding fluid-structure coupling self-excited vibration problems in valves.

          Abstract

          摘要 针对特种重型车辆用液阻减振装置的一种锥形节流阀的动态工作过程, 建立了该阀较精细的三维流-固耦合有限元仿真分析模型, 利用直接耦合计算方法求解入口瞬态流速激励下锥阀的耦合动力学响应; 通过对锥阀在多种弹性压紧力特性、结构设计状态和多种入口流速激励工况下的流体压强差及速度分布、阀门开度及阀芯受力等动态响应的细致量化分析, 解释了锥阀流-固耦合自激振动现象的机理:当弹簧预紧力较大而入口流速较小时, 锥阀在开启过程中必然出现阀门开度高频波动、阀芯回弹接触冲击等流-固耦合自激振动现象; 取消弹簧预紧力, 即可有效地抑制阀门开启过程的非稳态自激振动; 入口流速幅值较大时, 阀门开启波动过程缩短。这些认识对于解决许多流体阀系存在的流-固耦合自激振动问题具有重要意义。

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          Author and article information

          Journal
          J Tsinghua Univ (Sci & Technol)
          Journal of Tsinghua University (Science and Technology)
          Tsinghua University Press
          1000-0054
          15 January 2018
          19 January 2018
          : 58
          : 1
          : 35-42
          Affiliations
          1Department of Automotive Engineering, Tsinghua University, Beijing 100084, China
          Article
          j.cnki.qhdxxb.2018.22.006
          10.16511/j.cnki.qhdxxb.2018.22.006
          Copyright © Journal of Tsinghua University

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 Unported License (CC BY-NC 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by-nc/4.0/.

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