基于降维状态观测器的轮轨力估计方法研究

Research of Wheel-rail Force Estimation Method Based onReduced-order State Observer[HS)]

摘要:

轮轨作用力对车辆的运行品质及安全有重要影响；现有轮轨力测量方法采用了特制的测力轮对测量和轨道静态测量,其成本高、周期长、稳定性差；对现有轮轨力测量方法进行了研究,提出了降维状态观测器的方法观测轮轨力；建立单轮对车辆轨道垂向耦合模型,以车辆状态响应值与轨道激励作为降维状态观测器的输入；通过Matlab仿真计算,得出轮对振动位移的观测值快速收敛于仿真值,轮轨力有很好的吻合性；随着车辆速度增加振动位移收敛时间变长,轮轨力误差增大；结果表明,在一定条件下,此方法能够很好的地观测轮轨力的大小,为轮轨力的实时估计提供一种的新方法。

Abstract:

Wheel-rail force have a significant impact on the quality and safety of vehicle running. It used a special-made Instrumented wheelset detection and track static detection for the existing wheel-rail force measurement. But, it is costly, time-consuming and lack of stability. A method of reduced-order state observer is put forward based on the research of existing wheel-rail force measurement. A single wheelset vertical coupling model is built in this paper, also, the response values of vehicle state and track stimulation as the reduced-order state observer inputs. By MATLab Simulation, the observed values of wheel vibration displacement fast convergence in simulation values, wheel-rail force matches well. As the vehicle speed increases vibration displacement convergence time becomes longer and the wheel-rail force error increases. The results show that, under certain conditions, this method observes the wheel-rail force well, and it provides a new method for estimating the wheel-rail forces in real-time.