The Dynamic Characteristics Research And Analysis Of The Rotor Engine

The traditional reciprocating piston engine has a series of problems such as low efficiency, powerful vibration, large noise and small power density. To overcome the shortage of the reciprocating piston engine, a new rotor piston engine is proposed in this paper. This new engine which uses a planetary gear linkage as the power transmission equipment has several times more power dense than conventional IC engines and the structure of the engine is exceedingly compact. The paper takes the research of dynamic characteristics of the new rotor piston engine. The main work is organized as follows:(1) Using the method of vector mechanics, the kineto-static model of power transmission equipment is established by using Newtonian mechanics and the Euler equations. This model is used to analyze the dynamics situation of the various components in the case of the uniform rotation output shaft and then get the kinematic parameters of the key components as well as the reaction of kinematic pair of the power transmission equipment.(2) This paper uses Recurdyn dynamics simulation software to establish a virtual prototype model of the engine, then analyze the angular velocity, angular and centroid acceleration of the key parts and simulate the reaction forces between the various components. By comparing the simulation results with the dynamic static theoretical calculation results showed that curve change rule is the same and the limit position exists shocks, which prove the dynamic model is reasonable.(3) Using a dedicated data transfer interface, the structural model of the engine is successfully imported into ANSYS. Free and constraint modal finite element analysis is conducted on the key parts and the whole structure of the engine by applying the model consistent with the actual situation of the boundary conditions. Then harmonic response analysis is carried out on the key parts. The further study of the vibration states is taken on the key parts and the whole structure under different vibration frequencies loads. It verifies the rationality of the design, and the resonance is avoided.(4) The preliminary research on the rigid- flexible coupling model of the engine. The paper introduces two kinds of flexible body generation method that based on RFlex and FFlex. Then create rigid- flexible coupling model of the engine by importing the flexible body into Recurdyn. The mechanical property of the coupling body is studied through simulation. To get the low frequency modes of the coupling model, vibrating characteristic is analyzed on the engine.(5) Finally, this paper carries out the kinematics test of the physical prototype that proves the law of motion. This also shows the correctness and feasibility of prophase work. Further experiments will be done by setting up an experimental platform to guide the optimization and improvement of the engine.In this paper, the dynamics and vibration analysis of the power transmission equipment and the whole structure of the engine contribute to a more profound understanding of the working process of the engine and a more objective evaluation o f the performance of the engine, and also provide new methods and theoretical basis for the engine improvement and development.