Research on Manual Transmission Rattle Noise Experiment Technique

Gear rattle noise is one of the important characteristics of manual and dual-clutch transmission，it is generated by the impact of unloaded meshing gear pairs in the transmission due to engine torsional vibration. Based on a front-drive manual transmission and a five dynos drivetrain NVH test bench with high-speed sine wave generator function, this paper designs an experimental program suitable for transmission rattle noise. By driving dynamometer to simulate the torque fluctuation of real engine, the main research is to study the characteristics of the transmission rattle noise under different excitation amplitudes and different excitation frequencies, and the sensitivity of rattle noise under different gears, different oil temperatures, different excitation amplitudes and excitation frequencies is analyzed. Finally, the transmission maps of rattle noise in different gears can be obtained. The research results in this paper provide a credible basis and method for the development and design of the transmission NVH and its verification test. Meanwhile, it also provides important data support for the matching selection and engine calibration development of the traditional and hybrid powertrain, which has strong engineering guiding significance. The follow-up work is also prospected at the end of the paper.