针对某前驱车出现的clunk问题,在详细了解该车型传动系结构的基础上,分析该车型tip in clunk产生机理和传动系动态间隙理论计算方法,并用试验的方法获取传动系间隙值。详细介绍标定控制策略和优化方法,并尝试从标定和传递路径上解决该问...针对某前驱车出现的clunk问题,在详细了解该车型传动系结构的基础上,分析该车型tip in clunk产生机理和传动系动态间隙理论计算方法,并用试验的方法获取传动系间隙值。详细介绍标定控制策略和优化方法,并尝试从标定和传递路径上解决该问题,但实际效果不理想。进一步研究发现,采取将移动节球环直径增大0.1 mm和把移动节油脂更换为CX-SP1的油脂的方法,并用减小间隙和减小摩擦的工程样件进行整车验证,结果表明转向节的冲击振动消失,clunk优化明显,客户驾评表示可以接受。展开更多
BACKGROUND Total knee arthroplasty is one of the most successful operations performed worldwide today.Patellar clunk syndrome(PCS)is a postoperative complication that arises due to the development of a fibrous nodule ...BACKGROUND Total knee arthroplasty is one of the most successful operations performed worldwide today.Patellar clunk syndrome(PCS)is a postoperative complication that arises due to the development of a fibrous nodule along the undersurface of the quadriceps tendon.The current literature on PCS has not yet come to a consensus regarding its etiology.To date,this is the first study that analyzes the existing literature on PCS in order to generate a conclusion regarding its etiology.It is hypothesized that prosthesis design is the main component behind the development of PCS.AIM To determine the etiology of PCS and its association with pre and post-operative characteristics of the prosthesis and native knee.METHODS We conducted a systematic review according to the PRISMA guidelines by searching through PubMed,Cochrane,and Google Scholar from May-July 2018 for cases of PCS using search MeSH terms“patella OR patellar”AND“clunk”OR“catch”OR“crepitus”.The search included case series and clinical trials and excluded review articles,yielding 30 articles from the original search and 3 additional articles from reference lists.We extracted data upon the outcomes in patients afflicted with PCS to determine the etiology of PCS.We performed additional bias assessments to validate our search algorithm and results.RESULTS Prosthesis design was the metric most frequently implicated in the incidence of PCS,though several other metrics were contributory toward its pathogenesis.Later prosthetic designs incorporate a reduced intercondylar box ratio and box width to reduce contact between the proximal patellar pole and the intercondylar box,thereby reducing incidence of PCS.CONCLUSION The etiology of PCS is multifactorial,owing to the growing metrics that have associations with its incidence.This conclusion is validated by the significance of prosthesis design as the most likely parameter involved in developing PCS since different prosthesis designs are often the result of different parameters.Future studies should be directed at isolating individual prosthetic parameters of prosthesis designs in order to determine what permutation of parameters is most closely associated with the development of PCS.展开更多
文摘针对某前驱车出现的clunk问题,在详细了解该车型传动系结构的基础上,分析该车型tip in clunk产生机理和传动系动态间隙理论计算方法,并用试验的方法获取传动系间隙值。详细介绍标定控制策略和优化方法,并尝试从标定和传递路径上解决该问题,但实际效果不理想。进一步研究发现,采取将移动节球环直径增大0.1 mm和把移动节油脂更换为CX-SP1的油脂的方法,并用减小间隙和减小摩擦的工程样件进行整车验证,结果表明转向节的冲击振动消失,clunk优化明显,客户驾评表示可以接受。
文摘BACKGROUND Total knee arthroplasty is one of the most successful operations performed worldwide today.Patellar clunk syndrome(PCS)is a postoperative complication that arises due to the development of a fibrous nodule along the undersurface of the quadriceps tendon.The current literature on PCS has not yet come to a consensus regarding its etiology.To date,this is the first study that analyzes the existing literature on PCS in order to generate a conclusion regarding its etiology.It is hypothesized that prosthesis design is the main component behind the development of PCS.AIM To determine the etiology of PCS and its association with pre and post-operative characteristics of the prosthesis and native knee.METHODS We conducted a systematic review according to the PRISMA guidelines by searching through PubMed,Cochrane,and Google Scholar from May-July 2018 for cases of PCS using search MeSH terms“patella OR patellar”AND“clunk”OR“catch”OR“crepitus”.The search included case series and clinical trials and excluded review articles,yielding 30 articles from the original search and 3 additional articles from reference lists.We extracted data upon the outcomes in patients afflicted with PCS to determine the etiology of PCS.We performed additional bias assessments to validate our search algorithm and results.RESULTS Prosthesis design was the metric most frequently implicated in the incidence of PCS,though several other metrics were contributory toward its pathogenesis.Later prosthetic designs incorporate a reduced intercondylar box ratio and box width to reduce contact between the proximal patellar pole and the intercondylar box,thereby reducing incidence of PCS.CONCLUSION The etiology of PCS is multifactorial,owing to the growing metrics that have associations with its incidence.This conclusion is validated by the significance of prosthesis design as the most likely parameter involved in developing PCS since different prosthesis designs are often the result of different parameters.Future studies should be directed at isolating individual prosthetic parameters of prosthesis designs in order to determine what permutation of parameters is most closely associated with the development of PCS.
