Experimental and theoretical investigation of the fundamentals of agricultural cutting processes at high blade velocities

形成本申请主题的研究项目的目标是对农业机械中发生的切割过程进行基础实验和数值研究，重点是在没有反刀的情况下切割不同的茎型材料。为此，将通过实验确定切削力对各种参数的依赖性。这些参数包括例如切割速度、切割速度与被切割材料的干物质含量的比率以及切割刃的楔角和锐度。除了切削力之外，还将更详细地考虑切削过程的力学。在此之后，在评估试验的过程中，将导出科学定律，借助于这些定律可以描述切削过程。这些对于通过模拟来表示切削过程是必要的。这里的重点将放在多体模拟和离散元方法。所有准备的模拟模型都将得到验证。最后，将准备一个数据库，从该数据库中，除其他外，将有可能找到切割所研究的茎类材料所需的切割力，该切割力是对其具有显著影响的参数的函数。此外，数据库还将包含有关切削过程模拟表示的有用提示。

The objective of the research project forming the subject of this application is the fundamental experimental and numeric investigation of the cutting processes taking place in agricultural machines with the focus on the cutting of different stalk-type material without a counter knife. For this the dependence of the cutting force on a variety of parameters will be determined experimentally. The parameters include, for example, the cutting velocity, the ratio of the cutting velocities and the dry matter content of the material being cut as well as the wedge angle and sharpness of the cutting edge. In addition to the cutting force, the mechanics of the cutting process will be considered in more detail. After this and in the course of the evaluation of the tests scientific laws will be derived with the aid of which cutting processes can be described. These will be necessary for the representation of cutting processes by simulation. Here the focus will be placed on multi-body simulation and discrete-element methods. All the simulation models prepared will be validated. Finally a database will be prepared from which - amongst other things - it will be possible to find the cutting force needed for cutting the investigated stalk-type materials as a function of the parameters which have a significant influence thereon. In addition the database will also contain useful hints on the simulatory representation of cutting processes.