Vibration characteristic analysis of single-cylinder two-stroke engine and mounting system optimization design

Area of Science:

• Mechanical Engineering
• Vibration Analysis
• Automotive Engineering

Background:

• Single-cylinder two-stroke engines exhibit high rotational speeds and wide excitation frequency ranges.
• These engines generate significant structural vibration and noise, necessitating reduction strategies.
• Existing engine mounting systems require optimization for effective vibration and noise control.

Purpose of the Study:

• To analyze the excitation characteristics (frequency, direction, magnitude) of single-cylinder two-stroke engines.
• To design and optimize an engine mounting system to reduce vibration transmission.
• To validate the effectiveness of the optimized mounting system in achieving vibration isolation.

Main Methods:

• Analysis of engine excitation frequency, direction, and magnitude based on engine mounting system design theory.
• Development of a dynamic model of the engine powertrain mounting system using ADAMS software.
• Optimization of the mounting system using sensitivity analysis, targeting natural frequency minimization and employing sequential quadratic programming.

Main Results:

• A rubber isolator was selected as the new mount element.
• The optimized mounting system achieved a maximum frequency less than 1/4 of the excitation frequency.
• Significant vibration isolation was successfully achieved, reducing engine vibration transmission.

Conclusions:

• The developed dynamic model and optimization methodology are effective tools for designing engine mounting systems.
• The optimized mounting system significantly reduces vibration and noise from single-cylinder two-stroke engines.
• This approach provides a valuable method for improving the performance and comfort of engine support systems.