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Objective To characterize the abrasive wear of polymer tapes in ATM (Auto Teller Machine) servicing in sand dust environment. Aethods The abrasive wear experiment of polymer tapes, PEN (polyethylene-2, 6-naphthalenedicarboxylate) and PI (polyimide), by sand dust particles is performed in ATM tribosystem. The fractal characteristics of the worn surface of polymer tapes and the corresponding wear mechanisms are examined. ReSults As main results, the worn surfaces of polymer tapes show bi-fractal characteristics, and PI tape shows higher fractal dimensions and finer wear profiles than PEN tape. Wear mechanism examination shows macro and micro ploughing and cutting grooves and micro fracture characters, which gives reasonable explanation of bi-fractal character of worn polymer tapes. Conclusion Worn polymer tape shows fractal character and bi-fractal can be used in accurately characterizing the abrasive wear of polymer tapes of ATM in sand dust environment. 相似文献
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本文在分析现有船舶机械诊断技术的基础上,针对船舶营运的特点,提出和讨论了开发船舶机械的远程集散式诊断系统的设计原则、系统构成和软件结构。 相似文献
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Objective To investigate the changes to the strike extent of piston to cylinder after engine supercharge design. Methods The lubrication model between the skirt of piston and liner is established by means of piston dynamics, combined with the hydrodynamic lubrication equation. Optimized numerical analysis method is employed in solving the dynamics and lubrication equations. The analyses about piston strike under two combustion gas pressures are performed. Results The peak values of maximum eccentricity under supercharge condition are much greater than under non-supercharge condition, which means a stronger impulsion of piston to cylinder wall and a greater possibility of scuffing. The horizontal velocities of piston in supercharge condition are larger, which illuminate the more unstable motion state. Conclusion The analysis gives a new conclusion. Combustion gas pressure plays an important role in the piston strike motion. Influences of supercharge should be taken into account so that the traditional product test items can be improved. 相似文献
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Design for life-time performance and proper maintenance measures are usually needed to prolong the mean-time-between-failures
of complex equipments such as internal combustion engines. To reach this, it is important to obtain the information of time-varying
system performance in design stage and to identify the structural change at each moment. So a multidisciplinary model based
method is studied in this paper to unify the time-varying performance(TVP) prediction and system identification(SI) of equipments.
The related multidisciplinary model in this paper should be not only precise to give simulation results but also sensitive
to the variation of system parameters. So the varying history of system performance along with the structural change can be
obtained from the model. Then the value of system parameters can be identified by seeking roots with given detected responding
data and relationship between system responding data and system parameters. A case study on a low power gasoline engine shows
that the method presented in this paper can provide useful information for the development and maintenance of complex equipments. 相似文献
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接地面全熔化条件下冰面轮胎摩擦力的预测 总被引:1,自引:1,他引:1
依据流体动力润滑理论和热平衡原理,提出了接地面全熔化条件下冰面轮胎摩擦力的预测模型。结果表明,受不同因素的影响,摩擦系数变化趋势的模型预测同实验结果极为相似,文中分析讨论了影响摩擦力的主要因素,认杰表面模型,滑移率和界面温升等的影响应作为今后相关领域的研究重点。 相似文献
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