Mechanical System Design And Impact Response Analysis For Strap-Down North-Finder

Strap-down North-finder is used for mobile platforms, provide the directional benchmark and target orientation. As the North-finder's weight and dimensions are limited by working environment, North-finder must be compact structure, accurate positioning. Taking into account the North-finder, that it works, must be endure tremendous impact, North-finder's structural design must be achieve high stiffness, high strength and low weight. Thus, the study of North-finder's mechanical system orientation accuracy and dynamic response is very important and meaningful, the data can be used for improving the design and manufacturing.Based the technical indicators and the working characteristics of strap-down North-finder, this paper proposes a mechanism general design plan. Using over-positioning method designs the positioning mechanism, analyzes the positioning precision, and calculating the transmission parameters of rotation detection mechanism. Using Pro / E software establishes the model of North-finder, get the full size and the weight. North-finder is simulated in ADAMS. Through the simulation, it verification the feasibility of the program。According to vibration theory, this paper establishes the North-finder mathematical model, obtains the impact displacement response and acquires the factors which affect the North-finder's response. Through the simulation in ADAMS, it verifies the theoretical analysis is correct, obtain the response of different spring stiffness and damp of North-finder. The simulation provides important data for North-finder damper's design, in the future.Using ANSYS-LS/DYNA software, obtains the natural frequency and vibration mode of flange. In order to accurately analysis the flange materials impact process response, this paper carry on the transient dynamics FEA analysis to the flange. When X direction reached 35g impact, acquire the different dynamic response of flange. Comparison and analysis the response data.