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郑惠群 《宁波职业技术学院学报》2005,9(5):10-12
轮轴称重仪是测量车辆各轮、轴重及车辆总重的称重仪器,影响轮轴称重仪称重误差的因素很多,本文将车辆本身结构对轮轴称重仪的误差影响及其他因素的误差影响进行全面分析. 相似文献
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在发动机维修中,曲柄连杆机构的维修是重中之重,它的维修好坏对发动机的正常工作和使用寿命有很大的影响。文章对发动机曲柄连杆机构常出现的问题进行分析,提出一些正确的使用和维修方法与大家共勉。 相似文献
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ZHUHuai－liang 《上海大学学报(英文版)》2001,5(1):35-39
In this paper ,a hybrid approach was developed to investigate the transient responses of a multi-span non-uniform flexble spinning shaft with nonlinear and asymmetric supports.The non-uniform spinning shaft with variable parmeters was modeled as a Bernoulli-Euler beam column with sectional constant cross-section properties by the finite element method.The supporting stiffness behavior of the nonlinear supports was described as a piecewise-linear and asymmetric model.The equations of motion in the matrix form of a multi-span non-uniform spinning shaft with nonlinear and asymmetric supports were formulated using Hamilton‘s principle and the assumed mode method.As an example,a spinning rocket with many variable stiffness supports was numerically simulated by the direct integration method.The transient response and dynamic behavior of this rotate-dynamic system are analyzed. 相似文献
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潘玉山 《温州职业技术学院学报》2011,11(1):59-61,92
针对原始轴辊堆焊设备定位精度差、加工质量不稳定、堆焊效率低等缺陷,提出利用FX2N-20GM定位模块、FX2N系列PLC和步进电机组合的控制系统方案。实践表明,该控制系统能实现焊枪与轴辊联动控制,保证轴辊获得准确堆焊齿形,大大改善工作环境,提高加工效率。 相似文献
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本文针对寿王坟铜矿回风井断面小、线路长、阻力大以及矿井漏风、短路风流严重的问题,对矿井通风系统进行了详细的调查,提出了利用采空区和回风井并联通风的方案,并对利用采空区通风的稳定性和安全性进行了深入的研究,最后应用了利用采空区和回风井并联回风的通风系统,取得了良好的应用效果。将采空区作为回风通道的通风系统对于具有稳定采空区,且采空区透气性良好的中小型金属矿山有实际借鉴意义。 相似文献
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对立轴磨床多轴加工进刀轨迹优化控制模型的设计,提高模型的加工精度,为评价数控立轴磨床多轴联动的误差补偿提供依据。传统的进刀轨迹优化控制模型采用稳态预测误差控制的控制算法,导致磨床进刀的交叉耦合轨迹预补偿误差较大。提出一种基于直线轨迹的轮廓误差补偿的立轴磨床多轴加工进刀轨迹优化控制模型。以CAD为预处理软件工具,对加工模具进行空间曲线生成实体模型,构建三维造型,进行立轴磨床的多轴加工进刀轨迹控制模型设计,正确地选择加工刀具,合理地设置切削参数,构建刀具进刀的时间控制轴。构建复杂的零件加工控制系统解耦得到两个独立的控制子系统,实现进刀轨迹三轴联动控制,构建立轴磨床多轴加工进刀轨迹控制系统的轮廓误差向量最小化目标函数,实现控制模型改进。仿真结果表明,该模型能有效提高加工精度,减小误差。 相似文献
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付春平 《苏州市职业大学学报》2014,(1):35-37
根据自动扶梯传动结构的特点,对自动扶梯在使用过程中作用于扶手传动轴上的各种力进行分析与计算,验证扶手传动轴是否满足强度要求,从而为自动扶梯扶手传动轴设计提供充分的理论依据,为生产、制造安全可靠的自动扶梯提供保障。 相似文献
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船舶推进轴系是船舶动力装置的重要组成部分,校中计算是保证船舶推进轴系的安全、可靠工作不可缺少的环节。文章介绍了船舶推进轴系校中计算的类型和计算方法,并对相应的计算方法进行了分析和讨论,得出了校中计算在现阶段的主要实现方式及其发展的趋势。 相似文献
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Ressol R.SHAKIR 《浙江大学学报(A卷英文版)》2010,11(4):294-304
Evidence gained from previous field tests conducted on drilled shaft foundation shows that using drilling slurries to stabilize a borehole during the construction may influence the interfacial shear strength. This paper deals with an exhaustive study of the effects of drilling slurries at the contact between soil and concrete. This study involved adapting a simple shear apparatus and performing approximately 100 experimental tests on the interaction between two types of soils; clay and sandy clay and five specimens of concrete with different surface shapes. It also involved using bentonite and polymer slurries as an interface layer between soil and concrete. Results showed that an interface layer of bentonite slurry between clay and concrete decreases the interfacial shear strength by 23% and as an interface layer between sandy clay and concrete, bentonite increases interfacial shear strength by 10%. Using polymer slurry as an interface layer between clay and concrete decreases the interfacial shear strength by 17% while using it as an interface layer between sandy clay and concrete increases the interfacial shear strength by 10%. Fur- thermore, the data show that using bentonite and polymer slurry as an interface layer between clay and concrete decreases the sliding ratio by 50% to 60%, while increasing the sliding ratio by 44% to 56% when these are used as an interface layer between sandy clay and concrete. 相似文献