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LHD Vibrations Analysis and Numerical Modeling during Operations

机译：运营期间的LHD振动分析和数值建模

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摘要

Load-haul-dump vehicles (LHDs) are extensively used as primary loaders in mining operations. LHDs have proven to be vigorous, extremely productive and reliable in mining applications. They have a wide range of tramming capacities that have enabled them to become an essential component in the hard rock mining industry.;Increased mining economic challenges and global competition means the mining industry has to maximize productivity by cutting down operating and capital costs. Also, improvements in safety standards have led to the demand for safer and efficient machines.;LHD operators are at a high risk of whole-body vibrations (WBVs) exposure leading to musculoskeletal disorders (MSDs) over long exposure periods, and elevated lower back and neck injuries. Thus, there is a health and safety concern among LHD operators. Despite manufacturer's emphasis on ergonomics, there is lack of adequate fundamental vibration models of large mining equipment accessible to the public.;This research focused on developing valid analytical and numerical models for determining the vibration propagation in LHDs. Also, this research pioneered the development and analysis of comprehensive dynamic virtual models of LHDs with detailed vibration analysis of the operator-seat interface. The introduced LHD virtual prototype has a total of 24-DOF and captures the complex vibration mechanics of the LHD, with emphasis on vibrations reaching the operator seat-interface in the three dimensions (3D), x, y and z-directions. The RMS accelerations recorded at the operator-seat interface are 0.62 m/s 2 in the x-direction, 0.51 m/s2 in the y-direction, and 1.01 m/s2 in the z-direction which exceed the ISO-2631 comfort level.
机译：装卸车（LHD）被广泛用作采矿作业中的主要装载机。事实证明，LHD在采矿应用中具有强大的功能，极高的生产率和可靠性。它们具有广泛的行驶能力，使其成为硬岩采矿业的重要组成部分。；采矿经济挑战的加剧和全球竞争的加剧，意味着采矿业必须通过降低运营和资本成本来最大化生产率。同样，安全标准的提高也导致对更安全，更高效机器的需求。； LHD操作员面临长期暴露于全身振动（WBVs）导致肌肉骨骼疾病（MSD）的高风险，并且腰背升高和脖子受伤。因此，LHD运营商之间存在健康和安全问题。尽管制造商强调人机工程学，但仍缺乏足够的公众可使用的大型采矿设备的基本振动模型。该研究着重于开发有效的分析模型和数值模型，以确定LHD的振动传播。此外，这项研究还通过对操作员-座椅界面的详细振动分析，开创了LHD的综合动态虚拟模型的开发和分析。引入的LHD虚拟样机总共具有24自由度，并捕获了LHD的复杂振动机制，重点是在x，y和z方向三个维度（3D）上到达操作员座椅界面的振动。在操作员-座椅界面上记录的RMS加速度在x方向上为0.62 m / s 2，在y方向上为0.51 m / s2，在z方向上为1.01 m / s2，均超过了ISO-2631舒适度水平。

著录项

  • 作者

    Kolobe, Kgosietsile.;

  • 作者单位

    Missouri University of Science and Technology.;

  • 授予单位 Missouri University of Science and Technology.;
  • 学科 Mining engineering.;Engineering.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 184 p.
  • 总页数 184
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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