Designing and Optimizing NURBS Flexible Cambered CAM Curve
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摘要: 为使弧面凸轮在高速转动过程中有振动小、磨损小、精度与效率高等优点。利用NURBS优越的性能对现有的空间弧面分度凸轮的轮廓曲线进行设计，依据不同起止边界条件选定阶数并得到各种运动控制条件的NURBS柔性凸轮曲线。在标准双停留5次NURBS凸轮曲线基础上作多目标优化。采取依托NX“规律曲线”功能建立弧面凸轮三维模型新的建模方式，该法所构造的轮廓面曲线精确、效率高，然后利用MATLAB对NURBS柔性凸轮曲线和MS曲线进行对比。利用ADAMS对凸轮机构进行运动仿真，仿真结果表明，5次NURBS凸轮曲线的运动性能要优于MS曲线。用该方法制造的弧面凸轮有振动平稳、磨损小、运动性能好等优点。Abstract: In order to make the globoidal CAM in the process of high-speed rotation have the advantages of small vibration, small wear, high precision and efficiency, based on the superior performances of NURBS, the contour curves of the existing spatial globoidal indexing CAM are designed. The order is selected according to different starting and stopping boundary conditions, and the NURBS flexible CAM curves under various motion control conditions are obtained. Multi-objective optimization was performed with the standard 5-times and dual-stay NURBS CAM curve. Based on the function of the NX "regular curve", a new modeling method is adopted to establish a three-dimensional model of cambered CAM. The contour curve constructed by this method is accurate and efficient. Then MATLAB is used to compare the NURBS flexible CAM curve with the MS curve. The ADAMS dynamics simulation is used to simulate the motion of the CAM mechanism. The simulation results show that the motion performance of the 5-NURBS CAM curve is better than the MS curve. The cambered CAM made with this method has the advantages of stable vibration, small wear and good performance.
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Key words:
- cambered CAM /
- NURBS curve /
- MS curve /
- multi-objective optimization /
- dynamics simulation
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表 1 5次NURBS优化曲线结果
凸轮曲线 特性值 Vmax Amax Jmax Qmax (VA)max 5-NURBS 1.875 0 5.773 3 60.000 0 360.000 0 6.694 0 5-NURBS优化Ⅲ 1.759 6 5.335 1 61.873 6 772.156 3 6.668 6 MS曲线 1.759 6 5.528 0 69.466 4 872.940 0 5.457 7 
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