The transfer characteristics of the front and rear suspension links are studied. The transfer characteristics of the suspension system are important for the analysis of the causes of the smoothness and the improvement of the design of the suspension system. The experimentally measured front axle acceleration is taken as input, and the front frame acceleration is output. The transmission characteristics of the front suspension system are analyzed, and the experimental acceleration transfer characteristics of different loads, C-grade pavement and 20km/h working conditions are plotted.
The nonlinear characteristics of the stiffness of the front suspension rubber spring are reflected, which satisfies the requirements of the suspension system with near natural frequency under different loads. However, the natural frequency value is greater than the commonly used design value of 11512104 Hz, and the stiffness of the rubber spring can be appropriately reduced during optimization. In the frequency band 1158 Hz, the coherence function is greater than 0175, indicating that the amplitude-frequency characteristic of this frequency band is basically reliable, and also indicates that the acceleration response of the front frame is mainly caused by the front axle in this frequency band. The coherence function values ​​of other frequency bands are small, indicating that the acceleration response of the front frame is also affected by other excitation points; since the suspension is a nonlinear system, the value of the coherence function is small. Regardless of the 15t or 25t load, the most sensitive 48Hz frequency range of the human body is in the damping area, indicating that the front suspension rubber spring acts as a vibration damping. According to the amplitude at the time of resonance, the damping ratio F from no load to full load can be obtained as approximately 0150158.
The articulated dump truck rear suspension system adopts a balanced suspension structure, and the elastic components of the middle bridge and the rear axle suspension link are identical. Therefore, only the different loads, C-level pavement, and rear axle suspension links under 20 km/h working conditions are drawn. The experimental acceleration transfer characteristic diagram is obtained: in the frequency band of 3161318 Hz, the coherence function of the input and output of the rear axle suspension system is greater than 018, and the corresponding acceleration transmission rate is around 1, indicating that the elastic component of the rear suspension system is too rigid, in the human body. The rubber spring does not have a damping effect in the sensitive frequency range. The simulation results are in good agreement with the experimental results, indicating that the model is reliable, and the established dynamic model and analysis results lay the foundation for further optimization of the rubber spring suspension system.
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