摘要
在电磁能推进装置工作过程中,电枢与轨道间的接触电阻动态变化对系统性能有着重要影响。针对现有研究多依赖于Holm接触电阻理论并以电枢静止状态为基础的局限性,采用有限元和控制变量法研究实际推进情况下枢轨动态接触电阻对电磁能推进装置运动和温度特性的影响。首先,通过实验获取膛口电压、电流、电枢速度和位移等关键参数。其次,利用改进的完全自适应噪声集合经验模态分解(improved complete ensemble empirical mode decomposition with adaptive noise, ICEEMDAN)-小波阈值组合算法对所获得信号进行降噪处理,计算实际工况下的动态变化接触电阻。分别建立考虑枢轨动态接触电阻与不考虑接触电阻情况下的电磁热力耦合有限元模型,通过对比计算结果得到动态接触电阻对电枢运动和温度特性的影响。最后与实验结果进行对比,发现动态接触电阻是影响推进装置性能的重要因素,随着电枢位移的增加,接触电阻对运动特性的影响逐渐增加。另外,动态接触电阻的存在还会使电枢表面的温度迅速升高,电枢尾翼容易发生烧蚀,进而影响电枢的加速性能。该研究为进一步分析极端条件下动态接触电阻对电磁能推进装置的性能影响提供理论支持。
In the operation of electromagnetic propulsion devices,the dynamic change in contact resistance between the armature and the rail significantly impacts the system's performance.To address the limitations of existing studies that primarily rely on the Holm's theory of contact resistance and are based on the static state of the armature,this paper employs finite element analysis and the method of controlled variables to investigate the effects of dynamic contact resistance on the motion and temperature characteristics of electromagnetic propulsion devices under actual propulsion conditions.Firstly,key parameters such as muzzle voltage,current,armature velocity and displacement were obtained through experiments.Subsequently,the acquired signals were processed to denoise via using an improved complete ensemble empirical mode decomposition with adaptive noise(ICEEMDAN)combined with a wavelet thresholding algorithm,thus the dynamic contact resistance under real operating conditions could be calculated.Electromagnetic-thermal coupled finite element models were developed to assess the effects of dynamic contact resistance on the armature motion and temperature characteristics,with and without considering the resistance.Experimental comparisons reveal that dynamic contact resistance significantly influences propulsion device performance.And the impact on motion characteristics increases with the armature displacement.Moreover,the presence of dynamic contact resistance can rapidly increase the surface temperature of the armature,leading to the likelihood of ablation at the tail end,which in turn affects the armature's acceleration performance.This research provides theoretical supports for further analysis of the impact of dynamic contact resistance on electromagnetic propulsion devices under extreme conditions.
作者
闫荣格
王学谦
赵浩凯
赵文月
YAN Rongge;WANG Xueqian;ZHAO Haokai;ZHAO Wenyue(State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Hebei University of Technology,Tianjin 300401,China;Hebei Provincial Key Laboratory of Electromagnetic Field and Electrical Appliance Reliability,Hebei University of Technology,Tianjin 300401,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2024年第10期4749-4759,共11页
High Voltage Engineering
基金
国家自然科学基金重大研究计划重点项目(92066206)
河北省省级科技计划(225676163GH)。
关键词
电磁能推进装置
动态接触电阻
电磁热力耦合
运动特性
温度特性
electromagnetic propulsion device
dynamic contact resistance
electromagnetic thermal mechanical coupling
motion characteristics
temperature characteristics
