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首页> 外文学位 >Control of whirling vibrations in BTA deep hole boring process using fuzzy logic modeling and active suppression technique.
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Control of whirling vibrations in BTA deep hole boring process using fuzzy logic modeling and active suppression technique.

机译：利用模糊逻辑建模和主动抑制技术控制BTA深孔镗削过程中的回旋振动。

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摘要

Need for increased productivity has motivated interest in drilling equipment for high speed and high precision drilling. However, long drills exhibit aggressive and self-excited vibrations known as whirling motions. These vibrations deteriorate the outcome drilled surface qualities, i.e., finish, geometrical dimensioning and tolerances. Deep hole boring is the most complex and expensive drilling operation in terms of expertise needed, operating conditions and size.; The present research is to study the whirling vibrations of the boring bar workpiece system in the BTA deep hole boring process. After a review of the literature, a set of objectives is outlined for the thesis. The objectives are to formulate an analytical model, which will include the self-excited motion caused by the internal cutting forces in the Z and Y directions and the active suppression forces used to counteract the cutting forces. This model will be used to carry out simulation studies on the whirling vibrations of the boring bar-workpiece system and to carry out some experiments in order to validate the analytical model.; In view of the large number of machining parameters that influence the system dynamics and the resulting surface finish, geometrical dimensioning and tolerancing on the workpiece, a fuzzy logic model is proposed for off line modeling. Such a model will be used to examine the results obtained in the experiments and to predict the best parametric combinations that will provide the required surface finish. This will constitute an open loop control of the vibrations.; An active vibration suppression is carried out to reduce the whirling motion of the boring bar-workpiece system, which in turn will improve the surface finish. Two electrodynamic shakers are used in Z-Y plane to overcome the displacement of the boring bar while drilling.; The experimental investigations are carried out in the deep hole boring laboratory. Instrumentation involving proximity pickups, oscillator, amplifiers and demodulator are used to measure the displacement response and the orbital motion of the boring bar-workpiece system, and two electrodynamic shakers to suppress the motion. The surface roughness, straightness and circularity are measured which are related to the whirling vibrations and the machining parameters.
机译：对提高生产率的需求引起了对用于高速和高精度钻孔的钻孔设备的兴趣。但是，长钻会表现出强烈的自激振动，称为旋转运动。这些振动会降低最终的钻孔表面质量，即光洁度，几何尺寸和公差。就所需的专业知识，操作条件和尺寸而言，深孔钻孔是最复杂，最昂贵的钻孔操作。本研究旨在研究BTA深孔镗削过程中镗杆工件系统的回旋振动。在回顾文献之后，为论文概述了一组目标。目的是建立一个分析模型，其中将包括由内部切削力在Z和Y方向上引起的自激运动以及用于抵消切削力的有效抑制力。该模型将用于对镗杆系统的回旋振动进行仿真研究，并进行一些实验以验证分析模型的有效性。鉴于大量的加工参数会影响系统动力学以及最终的表面光洁度，工件的几何尺寸和公差，因此提出了用于离线建模的模糊逻辑模型。这种模型将用于检查在实验中获得的结果，并预测将提供所需表面光洁度的最佳参数组合。这将构成对振动的开环控制。进行主动振动抑制以减少镗杆系统的回旋运动，从而改善表面光洁度。在Z-Y平面上使用两个电动振动台，以克服钻孔时镗杆的位移。实验研究是在深孔实验室进行的。仪器包括接近传感器，振荡器，放大器和解调器，用于测量镗杆系统的位移响应和轨道运动，并使用两个电动振动器来抑制运动。测量与回旋振动和加工参数有关的表面粗糙度，平直度和圆度。

著录项

  • 作者

    Al-Wedyan, Hussien.;

  • 作者单位

    Concordia University (Canada).;

  • 授予单位 Concordia University (Canada).;
  • 学科 Engineering Industrial.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 363 p.
  • 总页数 363
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 一般工业技术;
  • 关键词

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