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Sound quality improvement for a four-cylinder diesel engine by the block structure optimization

机译：通过块体结构优化提高四缸柴油机的音质

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摘要

High sound quality and low radiated noise are two dominant demands for the vibro-acoustic performance of internal combustion engines. Such engines with high acoustic quality will greatly improve the acoustic environment both inside and outside of the passenger compartment of an automobile. In this paper, this performance of the block of a four-cylinder diesel engine was simulated and bench-tested. Then the vibro-acoustic problems were diagnosed and optimized. The finite element analysis method was adopted to numerically analyze the natural modes of the block. The finite-element model of the block was verified by the experimental modal analysis utilizing the single-input and multiple-output technology. The results indicate that the modal frequency errors from the simulation and experiment are permissible in respect of engineering and the accuracy of the finite-element model highly matching the real one is validated. Then, the flexible multi-body dynamics model of the diesel engine was constructed and excited by the boundary conditions comprised of in-cylinder gas pressures, cylinder liner-piston contact induced lateral forces and valve system motion induced impact forces. The simulated vibration velocity levels from the block surface were obtained under the rated condition (75 kW/ 3600 rpm) and well verified by the bench test. Boundary element analysis method was employed to acquire the radiated acoustic pressures from the block surface in the frequency range of interest. Optimized schemes are implemented to the block surface in order to reduce the radiated noise and enhance the sound quality of the diesel engine. Finally, the optimal block was cast. And the bench-test results indicate that the sound quality of the new-block engine is substantially improved. The research achievements validate the feasibility and reliability of the optimal design for the block.
机译：高音质和低辐射噪声是内燃机振动声学性能的两个主要要求。具有高声学质量的这种发动机将极大地改善汽车乘客室内外的声学环境。在本文中，对四缸柴油机缸体的这种性能进行了仿真和台架测试。然后诊断并优化了振动声学问题。采用了有限元分析方法对块体的自然模式进行了数值分析。通过使用单输入和多输出技术的实验模态分析，验证了该块的有限元模型。结果表明，仿真和实验中的模态频率误差在工程方面是允许的，并且验证了与实际模型高度匹配的有限元模型的准确性。然后，建立了柴油机的柔性多体动力学模型，并通过包括汽缸内气压，汽缸套-活塞接触引起的侧向力和气门系统运动引起的冲击力的边界条件来激发该模型。在额定条件（75 kW / 3600 rpm）下获得了来自块表面的模拟振动速度水平，并通过台架试验进行了很好的验证。边界元分析方法被用来获取在感兴趣的频率范围内从块表面辐射的声压。为了减少辐射噪声并提高柴油机的声音质量，对缸体表面实施了优化方案。最后，浇铸了最佳块。基准测试结果表明，新块引擎的声音质量得到了显着改善。研究成果证实了该块体最佳设计的可行性和可靠性。

著录项

  • 来源
    《Applied Acoustics》 |2013年第1期|150-159|共10页
  • 作者

    Jie Mao; Zhi-yong Hao; Guo-xi Jing; Xu Zheng; Chi Liu;

  • 作者单位

    Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China;

    Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China;

    Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China;

    Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China;

    Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    diesel engine; sound quality; block; structural optimization; flexible multi-body dynamics;

    机译：柴油发动机;音质块;结构优化;灵活的多体动力学;

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