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Research on Digital Design and Simulation of Headers in Rice and Wheat Combine Harvesters

Author: QiBing
Tutor: YangXiaoJing
School: Kunming University of Science and Technology
Course: Agricultural mechanical engineering
Keywords: Combine Header Digital design Virtual prototyping
CLC: S225.3
Type: Master's thesis
Year: 2011
Downloads: 24
Quote: 0
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Abstract


At present, agricultural machineries are researched and designed commonly in traditional R&D model, in which design activities need long development cycle and run in low efficiency, product performances are poor. In order to improve the level of agricultural machinery design and product performance, and to promote the application of advanced digital design in agricultural machinery area, headers of rice and wheat combine harvesters are studied using developments of technologies such as digital modeling, parametric design, secondary development of dedicated CAD and virtual prototyping. The works of this paper include the following aspects:1. The disadvantages of China agricultural machineries’R&D model are analyzed. The developments of grain combine harvesters at home and abroad are summarized. Digital design technology and theory are introduced in detail.2. Header’s kinematic analysis is done, the parameters’range are confirmed and their effects on working performance are analyzed, preparing for modeling and simulation. By the works, the irrationalities of reel shaft’s install locations are pointed out. The concept of’Minimum of shift-forward-length’ that synchronously makes sure stably propelling and vertically inserting is defined. New mathematical model is built and solved by Matlab. Parameters of reciprocating cutter are analyzed, motion equations of cutter edge vertexes are built, cutting drawing is gained by Matlab. Inertial force of cutter is analyzed and its dynamical model is built. Kinematic analysis of spiral conveyor is done, by which parameters’area are confirmed.3. Three-dimensional model of a combine harvester’s header is built in software Solidworks, as initial values of structural parameters are confirmed. Driving and driven parameters and their relational expressions are ascertained. Secondary development of Solidworks is done by VB computer language, in result of which the parameterization digital mockup system of a combine harvester’s header is built, implementing the function of rapidly getting product mockup under different groups of parameters that users inoput.4. As the digital model is imported into VP software Adams, kinematic and dynamic simulation is done. Relationship curves of reel shaft’s reasonable install locations as well as range of action followed the speed ratio are drawn, with which the theoretical analysis before is justified. Three cutting speeds’variation curves are drawn. The link length of crank and connecting rod mechanism is optimized. Based on the optimized structure, the effects of counterweight’s mass on horizontal and vertical inertial force are analyzed. Relationship curve between the pushing speed and helical pitch of spiral conveyor is drawn.To sum up, in this paper, advanced digital design technologies are successfully applied in the headers of rice and wheat combine harvesters. Through the detailed research, the key parameters’value range and relationship curves with others are gained. The application of advanced digital design technologies in agricultural machineries is implemented. The works of this paper are helpful to provide an availably method and experience to the future research and design of agricultural machineries.

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CLC: > Agricultural Sciences > Agricultural Engineering > Agricultural machinery and implements > Harvesting machinery > Grain,wheat combine harvester ( Awn )
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