摘要
目的研究缸套珩磨网纹表面计算机模拟方法,对比缸套网纹表面确定性分析流量因子与Patir&Cheng高斯分布流量因子差异。方法采用快速傅里叶变换技术(FFT)及坐标变换,对高斯分布平台表面及具有任意方向的各向异性沟槽表面进行了计算机模拟,并叠加合成满足要求R_(pq)、R_(vq)及珩磨角度参数的双高斯缸套珩磨网纹表面。通过表面概率支承率曲线分析,验证该方法的精度。在此基础上,进行给定边界条件下网纹表面的流动分析,对比确定性分析流量因子与Patir&Cheng高斯分布流量因子差异。结果调整表面高度标准差、珩磨角度及自相关长度,可实现不同参数珩磨网纹的建模,生成的珩磨网纹表面参数与给定输入参数偏差较小。相比Patir&Cheng高斯分布流量因子,珩磨网纹确定性分析压力流量因子能更好地反映珩磨角度对不同方向流量的影响。同时,珩磨网纹沟槽对小间隙下剪切流量的影响更加明显。结论网纹表面的确定性分析流量因子与Patir&Cheng高斯分布流量因子存在较大差异,缸套网纹表面建模及流动特性分析可更好地反映表面粗糙度对表面润滑性能的影响,为进一步开展缸套-活塞环多尺度摩擦学分析及珩磨网纹参数优化奠定了基础。
With the stricter emission regulations and the crisis of fossil fuels,fuel efficiency and reliability of internal combustion engines are attracting more and more attention.The piston rings and cylinder liner friction pair are the primary source of the friction loss and wear failure in internal combustion engines.Cylinder liner honing texture is a special surface structure with a bi-Gaussian distribution that is designed to improve piston rings and liner tribological properties.Although the homogenization method and image rotation method have been used in the modeling of cylinder liner honing surface,homogenization-based modeling of the cylinder liner honing surface can not consider the actual distribution characteristics of the rough surface,while the method based on image rotation can generate a surface with a given orientation and synthesize it by superposition as a cylinder liner honing texture requires a rotated image area larger than the target area,which is not easy to handle.In addition,the Patir&Cheng flow factor determined based on the Gaussian distribution assumption is usually used for the lubrication analysis of piston rings and cylinder liners,while the honed surface of the actual cylinder liner is bi-Gaussian distribution,which is not applicable.In this work,the fast Fourier transform and the coordinate rotation transform were used to simulate the surface of the cylinder liner,which consisted of a platform with Gaussian distribution and an anisotropic groove surface with a given direction and independent distribution characteristics.The honing texture surface of the cylinder liner was formed by combining the platform surface and the groove surface.In addition,the simulated cylinder liner surface pressure flow factor and shear flow factor were compared with the Patir&Cheng flow factor based on the Gaussian distributed surface.The method based on FFT,autocorrelation function with coordinate rotation,and surface synthesis proposed in this work could simulate cylinder liner honing surface with specified height characteristics,honing angle,and autocorrelation length.The accuracy of the method was verified by material probability curve analysis,and the statistical characteristics of the simulated surface matched well with the measured cylinder liner honing surface values.By adjusting the parameters of rotation angle,valley correlation length and height parameters,the cylinder liner surface with different honing angles,different honing line spacing and honing depth could be achieved.Compared with the Patir&Cheng flow factor based on the Gaussian distribution surface assumption,the pressure flow factor of the liner honing surface can better reflect the effect of the honing angle on the flow in different directions.Meanwhile,the effect of honing grooves on the shear flow under small spacing is more obvious.The flow factor of the honing surface is quite different from that of the Gaussian distribution surface Patir&Cheng assumed.It reflects the increased flow due to deep grooves in the actual liner honing surface.The modeling of the cylinder liner honing surface and the analysis of the flow characteristics can better reflect the effect of the liner surface roughness on the surface lubrication performance.
作者
汤义虎
贺林
黄立
李丽婷
孟祥慧
TANG Yi-hu;HE Lin;HUANG Li;LI Li-ting;MENG Xiang-hui(Shanghai Marine Diesel Engine Research Institute,Shanghai 200240,China;Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2023年第8期173-181,共9页
Surface Technology
基金
国家自然科学基金(52130502)。
关键词
缸套
珩磨网纹
快速傅里叶变换技术
表面模拟
流量因子
cylinder liner
honing texture
fast Fourier transform(FFT)
surface simulation
flow factor
作者简介
汤义虎(1986-),男,博士;通讯作者:孟祥慧(1976-),男,博士,教授,主要研究方向为动力装备多学科耦合分析及长寿命低摩擦设计。
