薏苡压缩力学特性试验及响应面优化

为研究薏苡力学特性,提高机械脱壳方式下的薏苡脱壳质量.以破壳力和破仁力为试验指标进行了薏苡的压缩力学特性试验.采用单因素试验分析施压方向、施压速度和干基含水率对薏苡破壳力和破仁力的影响,通过Box-Behnken中心组合试验设计建立了破壳力、破仁力与试验因素的数学回归模型,并利用响应面法以薏苡可承受的破壳力最小、破仁力最大为优化目标得到薏苡脱壳的最佳组合参数为:施压方向为正向施压,施压速度7.598 mm.min-1,干基含水率7.048％,此时的薏苡可承受的破壳力为22.067 N,破仁力为86.016 N.经平行试验验证得到的破壳力为21.1 N,破仁力为82.6 N.验证结果与优化结果误差均小于5.0％,优化结果具有较高的可信度.研究结论可为薏苡脱壳加工装备的研究与优化提供理论依据与技术参考.

Test on the compressive mechanical properties of Coix and optimization of response surface methodology

In order to study the mechanical properties of Coix and improve the quality of shelling in the way of mechanical method. Taking the shell breaking force and kernel breaking force as the experimental index, the experiment of the compressive mechanical properties of Coix were tested. The influence of pressure direction, pressure speed, and dry basis moisture content on the Coix shell breaking force and kernel breaking force were analyzed by single factor experiment. The mathematical regression model of shell breaking force, breaking kernel force and test factors were designed and established by the Box-Behnken central composite design. Using the response surface method and targeting the minimum breaking force and the maximum breaking force for optimization, The best combination parameters of Coix shelling as follows: the pressure direction was positive direction pressure, the pressure speed was 7.598 mm·min^-1, and the dry basis moisture content was 7.048%. The Shell breaking force of Coix was 22.067 N and the kernel breaking force of Coix was 86.016 N. Parallel experiments verified that the Coix shell breaking force was 21.1 N, the kernel breaking force was 82.6 N. The error between the verification result and the optimization result was less than 5.0%, which shows that the optimization result had high reliability. This conclusion can provide a theoretical basis and technical reference for the research and optimization of Coix dehulling processing equipment.