Research Of Digital Design And Analysis And The Application Of Arc Spring On DMF

The power transmission system of automobile is a torsional vibration system with multiple degrees of freedom. The torsional vibration and the noise which generated by the automobile have a great influence on the performance of the automobile. Dual mass flywheel, namely DMF, is a new type of structure which invented at the end of the 20th century 80’s, it is advantageous to isolate and absorb from the engine torsional vibration. At the same time, it also has the function to transmission gearbox load shedding, vibration of the crankshaft and can improve the performance of automobile’s shifting, it can help to improve the comprehensive performance of automobile. DMF is a key component of the automobile which used to reduce the vibration, and the arc spring is the core component of the DMF. As the main shock absorber, the arc spring is not only used to bear the torsional vibration, but also to bear the friction force from the track of the spring. Also the normal operation of the vehicle work with different conditions, such as idle speed, normal driving, acceleration and deceleration, this has put forward higher request to the key component DMF of vibration reduction. In many aspects such as performance and process test, the arc spring of elastic element is putting forward more strict standards.This thesis at home and abroad related research and development process based on arc spring and dual mass flywheel products of different structure, digital design, digital analysis, production process, performance test and dynamic stiffness application aspects of analysis and research, the specific contents are as follows:In Chapter One, the thesis give the overall summary of the arc spring and the application of arc spring DMF including its domestic and foreign development and research actuality. Then it analyzes the problems existing in the current study, and the technical and research direction is proposed, the research content of this thesis is presented.In Chapter Two, mainly introduces the subject of DMF in the arc spring vibration control technology and anti-vibration principle, focuses on the circumferential arc spring structure of DMF. Established a mathematical model of arc spring. Analysis of characteristics is derived based on discretization method, under the guidance of the spiral equation established the three-dimensional model of the inner and the outer arc spring.In Chapter Three, proposed the concept of digital design of arc spring, and the need of digital design for arc spring is analysed, and also puts forward a set of applied to digital design of arc spring modular program, and based on the scheme of different spring digital design process were analyzed. And the software named Solidworks was used to establish its three-dimensional model.In Chapter Four, proposed the concept of the digital analysis of arc spring, and the overall design and analysis platform is established, the guidance of the platform scheme can realize digitized analysis of arc spring, and realize the design of automation needs. At the same time, the software named Simulation is used to carry on the finite element statics analysis to the arc spring, and the stress and displacement are analyzed qualitatively.In Chapter Five, the production process of arc spring is analyzed, and the process flow, production equipment and test equipment are studied. A set of static stiffness characteristic test method of arc spring is designed, and the concrete conditions of the experiment are explained further.In Chapter Six, the main contents and innovations of this thesis are summarized, and the future work and research direction are also discussed.