Abstract
Load-sensing steering systems for articulated loaders are prone to large pressure shocks and oscillations during steering operations, affecting the system stability. An optimized structure of the redirector with bypass damping is proposed to improve this phenomenon. In this structure, orifices and throttle grooves are added to the traditional redirector. To control the steering load and working conditions, the steering load of the loader is replaced by a pressure regulating valve. Simulation and experimental results reveal that the redirector with bypass damping has better load-sensing characteristics than the traditional redirector. The peak output pressure shock caused by the load unit step signal decreases from 6.50 to 5.64 MPa, which means the pressure oscillation of the hydraulic system is reduced by 13.4%. The pressure fluctuation time can be reduced from 2.09 to 1.6 s, with a decrease rate of 23.4%. The output pressure oscillation decays swiftly, and the smoothness of the steering operation is improved significantly.
Highlights
A loader is mainly used to load and unload materials and shovel work within a certain range, and frequent steering operations are required in its working conditions [1, 2]
4.3 Simulation Results The dynamic characteristics of the redirector with bypass damping are analyzed for different steering wheel speeds, different electromotor speeds, and different steering loads
The simulation curves reveal that the flow rate of the redirector increases with an increase in the steering wheel speed
Summary
A loader is mainly used to load and unload materials and shovel work within a certain range, and frequent steering operations are required in its working conditions [1, 2]. Researchers have conducted comprehensive studies on steering systems for articulated vehicles using numerical analysis and simulations [3,4,5]. More accurate steering performance and the main parameters affecting the performance have been obtained. During the steering operation of existing articulated loaders, some unstable situations, such as shocks and oscillations in the hydraulic system, have occurred, resulting in poor machine stability of the machine when steering starts and stops. The optimization of steering system performance has become a focus of research. In Ref. [8], the NSGA-II
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