| Working in the man-planted forest, forestry felling & cultivation machine shows the incomparable advantage. Especially its peculiar chassis has advantages of strong pull, less damage for forest land, and provides safe, comfortable working environment for workers. Then improve the production efficiency and the utilization ratio of timber.This paper was conducted on the bases of "the key technology equipment' research and development of multi-function forest felling & cultivation" which is the "11th five-year plan" funded projects of national science and technology support plan (project number 2006BAD11A15), at the same time, this paper is one part of this project and it mainly researches the forestry felling & cultivation machine's chassis design theory research and application.This paper uses several methods which include modern engineering machinery design method, Mathematical modeling analysis, the Optimization design theory and the Computer emulation technology to research the forestry felling & cultivation machine's chassis and the influence of machine design, and make optimization design for them. It mainly includes the following aspects:1. It summarizes the current situation of automatic Forestry felling & cultivation machinery research's application at home and abroad, and analyzes the present situation of foreign typical forestry felling & cultivation machine's development and research. Through absorbing foreign advanced experience and research, it analyzes the present situation of Chinese engineering machinery research technologies and fast-grown forest's operating environment, and also proposes forestry felling & cultivation machine, chassis' design scheme and technical route which are suitable for Chinese national conditions and forest conditions.2. It makes virtual design and optimization design to the machine by using computer virtual design technology and it establishes the whole structure and organization simulation model of the hinged forest cutting which includes work chassis and homework device model. It also establishes the forestry felling &cultivation machine, work platform (chassis frame) multiple target math modal, and makes structural analysis and optimization for chassis operating requirement based on finite element theory.3. According to the working environment's design requirements to the forestry felling &cultivation machine, hinged steering chassis, it analyzes the steering process and makes use of the equivalent conversion principle to simplify the steering system into general mechanical model, and establish kinematics model to make dynamic analysis of steering system, it also analyzes the factors which influences the steering control system and make control performance analysis. Based on the solving method of nonlinear optimization problem, it analyzes and optimizes the forestry felling &cultivation machine, chassis hydraulic hinged steering system mechanism. Under different logging conditions, it will test the hydraulic hinged steering system and verify the theoretical mathematics model is reasonable.4. Accordingto the design of chassis of the forestry felling &cultivation machine, the mathematical model of the transmission system was set up for simulation analysis, With the contrast between the results of the simulation and the working requirement, it will be validated the mathematical model of usability and the simulation feasibility.According to the theory research and optimal design result of the Forestry felling &cultivation machine, chassis and the joint of physics experimental prototype, the author makes experimental analysis of the chassis'driving performance and operation stability, and verifies the rationality of the forestry felling &cultivation machine, chassis optimization design theory. Try to establish a set of suitable for Chinese forestry felling &cultivation machine chassis design and evaluation system. This paper provides technical reference for developing and making new forestry felling &cultivation machine's chassis.
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