基于响应面法的摊铺机压实系统参数优化

摘要：对摊铺机样机的试验研究发现沿熨平板长度方向振幅差值较大。为了改善熨平板振幅的不均匀性,将熨平板作为柔性体,建立了摊铺机压实系统的刚柔混合动力学模型;选取振捣梁质量以及振动器偏心轴的质量和偏心距的乘积为设计变量,以熨平板上节点振幅差为优化目标,通过基于正交设计的响应面方法,借助数值分析,建立优化变量和优化目标间的函数关系,采用遗传算法进行优化。优化后熨平板上节点振幅差减少了83%,各节点振幅均匀性大大改善。     

Process design for heat fusion of thermoplastic composites using molecular dynamics and a response surface method

This study investigates efficient optimization of heat fusion conditions between thermoplastics using molecular dynamics (MD) and a response surface method. The heat fusion process between polypropylene and polyethylene and the uniaxial elongation for evaluation of the interfacial bonding strength were modeled using coarse-grained MD simulation. To determine the optimal conditions of heat fusion, experimental points were selected on the basis of a central composite design, and a second-order polynomial response surface was created by setting temperature, pressure, and polymerization degree as explanatory variables and the strength of fused interface as the response. The obtained optimal solution under constrained conditions yielded the highest strength when compared with other experimental points and random points.     

响应面分析法优化不锈钢激光切割工艺参数

为了获得良好的不锈钢激光切割质量,确定合理的切割工艺参数,本文以3 mm厚304不锈钢为研究对象,采用响应面法进行试验方案的设计和分析,利用超景深显微镜进行了试样表面切缝宽度、表面纹理最大峰值、挂渣量的测量,利用最小二乘法进行数据处理,研究了激光功率(X₁)、切割速度(X₂)、离焦量(X₃)以及辅助气体压力(X₄)对不锈钢切割表面切缝宽度、表面纹理最大峰值、挂渣量的影响规律,并基于响应面法得到了3个响应目标的预测函数.实验结果表明:X₂=2.48 m/min,X₃=-1.05 mm,X₄=1 MPa时,随着激光功率的增加,切缝宽度不断增大;X₁=300 W, X₄=1.2 MPa时,随着切割速度的加快切缝宽度逐渐减小,随着离焦量的增大切缝宽度先减小后增大;X₁=300 W,X₃=0 mm,X₄=1.40 MPa时表面纹理的最大波峰值RZ随着激光功率、离焦量以及切割速度的增大先减小后增大。以切缝宽度最窄、表面纹理最大峰值最小、挂渣量最少为响应目标确定了3 mm厚304不锈钢激光切割的最佳工艺参数为X₁=365.86 W,X₂=2.75 m/min,X₃=0 mm,X₄=1.4 MPa。试验验证发现:切缝宽度、表面纹理最大峰值、挂渣量的预测误差应分别控制在8.4%~12.7%、21%~24.9%、16.7%~19.5%。