中密度纤维板连续平压多场耦合效应及精准工艺协同控制机理

Continuous flat-pressing is a requisite from biomass energy-conservation comprehensive utilization , which leads the progress of wood-based panel mass production. It is a intricate system that contains heat-and-mass-transfer, physicochemical-reaction and information-exchange in time and spacial domain, and integrates complexities of structure, function and motion. The project focus on forming priciple of medium density fiberboard(MDF) mat and continuous flat-pressing process, to research changing rules of mat's internal and external environment(pressure, temperature, humidity, gas, adhesive and solid, etc) during hot-pressing process, build a dynamic model of temperature field, pressure field and heat-and-mass-transfer in hot-pressing shape control system, build the process model based on the natural characteristics(material, thickness, density, moisture and adhesive,etc) of mat and multi-field coupling effect, and then study the viscoelasticity and dynamic variation rules of mat during continuous hot-pressing process. In view of the MDF viscoelastic automatic flatness control (AFC), research optimization of hot-pressing mode, dynamic surface tracking, rapid automatic rectification of shape, and the synergetic control principle for distributed power unit of flexible hot pressboard consistency control. Study on the use of robust control method to solve the problems of the multi-field coupling effect, the uncertainty caused by the slab viscoelasticity and the reliability of control system, then construct the precision process synergetic control strategy of the MDF continuous flat-pressing viscoelastic plate shape.

连续平压技术是人造板规模化生产的发展趋势，是生物质资源节约节能综合有效利用的必然要求。连续平压系统是在时间和空间上存在热质传递、物化反应与信息交换的集结构、功能及运动复杂性于一体的复杂系统。课题以中密度纤维板(MDF)板坯成型机理及连续平压过程为研究对象，研究热压过程中板坯内、外环境(压、温、湿、气、胶、固等)各因素变化规律，建立热压板形控制系统中温场、压力场和热质传递动态模型，建立基于板坯固有特性(材质、厚度、密度、含水率等)及多场耦合效应的工艺模型，分析连续平压成型过程中板坯粘弹特性及其动态变化规律，探究热压模式优化、动态面跟踪、自动板形快速纠偏、挠性热压板一致性控制等分布式动力单元协同控制机理，解决存在多场耦合效应、板坯粘弹性不确定性的鲁棒控制问题及稳定性问题，以此构建MDF连续平压粘弹性板形精准工艺协同控制策略。

连续平压技术是人造板规模化生产的发展趋势，是生物质资源节约节能综合有效利用的必然要求。连续平压系统是在时间和空间上存在热质传递、物化反应与信息交换的集结构、功能及运动复杂性于一体的复杂系统。.课题以中密度纤维板(MDF)板坯成型机理及连续平压过程为研究对象，项目围绕中心内容在多场耦合效应建模及粘弹性板形热压工艺机理、连续热压自动板形工艺控制机理、分布式动力单元协同控制机理、不确定性分析与鲁棒控制方法4个方面进行了深入理论研究，形成了一套MDF连续热压基础理论体系和相关成果。研究成果对提高连续热压技术和产品质量，以及提高设备对原材料适应能力，实现节约和敏捷生产具有重要科学意义。.项目研究成果在国内外期刊发表论文15篇，会议论文6篇， SCI/EI检索论文12篇，获授权发明专利2项、实用新型2项，申请进入实审的发明专利1项。人才培养毕业博士生4名，硕士生5名。.此外，项目研究在完成在申请书要求的基础上，在人造板（MDF）设备智能感知和并行计算方面又做了一些相关延展和探索性工作，课题完成效果良好。