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柴油机电动增压器电机轴设计及其流量特性研究
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作者 钟应子 唐国强 韩伟强 《机械设计》 CSCD 北大核心 2022年第8期36-41,共6页
为改善柴油机加速时涡轮迟滞所带来的高碳烟、高油耗问题,设计了一款补气量不依赖柴油机工况的电动增压器。其结构设计的核心为电机轴的设计。电机轴设计需满足如下要求:压气机叶轮、压气机壳与电机轴刚性连接;压气机叶前间隙应在0.382~... 为改善柴油机加速时涡轮迟滞所带来的高碳烟、高油耗问题,设计了一款补气量不依赖柴油机工况的电动增压器。其结构设计的核心为电机轴的设计。电机轴设计需满足如下要求:压气机叶轮、压气机壳与电机轴刚性连接;压气机叶前间隙应在0.382~0.645 mm间。为此,重点探讨了电机轴各段尺寸的设计,以实现电动增压器响应快、流量大、效率高的工作特点。最后,将设计好的电动增压器流量特性进行了实测,并绘制了电动增压器的MAP图。结果表明,设计的电动增压器最大流量达610.5 kg/h时,增压比可达1.137,具有流量大,响应快,结构简单的优点,为改善柴油机加速性能提供了技术支撑。 展开更多
关键词 电动增压器 电机轴设计 刚性连接 流量特性
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Development of two-axis control index table driven by direct drive motors
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作者 KIM Jae-hyun LEE Choon-man 《Journal of Central South University》 SCIE EI CAS 2011年第6期1962-1968,共7页
The stability and reliability of a tilting index table should be considered at the design stage. A design method for the lightweight and improvement of the stability of the structure in a tilting index table was propo... The stability and reliability of a tilting index table should be considered at the design stage. A design method for the lightweight and improvement of the stability of the structure in a tilting index table was proposed using a commercial analysis program, ANSYS Workbench 12, by analyzing the static-thermal characteristics of the developed high-accuracy tilting index table at its design stage. The results of the performed structural analysis show that the maximum stress is generated at the stock tail part. An optimum design for the stock tail part was carried out to reduce the maximum stress and deformation. Also, the design variables were determined by considering the support of the stock tail part for the C-axis body. In the comparison of the results before and after the optimization, the maximum deformation and stress are improved by 2.8% and 8%, respectively. 展开更多
关键词 tilting index table structural analysis modal analysis thermal analysis optimum design
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The influence of rolling bearing clearances on diagnostic signatures based on a numerical simulation and experimental evaluation
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作者 Ibrahim Rehab Xiange Tian +1 位作者 Fengshou Gu Andrew D. Ball 《International Journal of Hydromechatronics》 2018年第1期16-46,共31页
This paper presents investigations into the influences of bearing clearances on the diagnostic features of monitoring rolling-bearings. A nonlinear dynamic model of a deep groove ball bearing with five degrees of free... This paper presents investigations into the influences of bearing clearances on the diagnostic features of monitoring rolling-bearings. A nonlinear dynamic model of a deep groove ball bearing with five degrees of freedom is developed for numerical analysis under increased radial clearances which are due to not only the scenarios of bearing grades but also gradual wear with bearing service lifetime. The model incorporates local defects and clearance increments in order to gain the insight into the bearing dynamics under different fault cases along with clearance changes. Numerical results show that the vibrations at fault characteristic frequencies exhibit clear inconsistency with common understandings for different cases of increased clearances. This study highlights that it has to take into account the clearance effect, especially for the inner race fault, in order to avoid the under-estimate of fault sizes which may be indicated by the feature amplitude reduction. 展开更多
关键词 roller element bearing nonlinear dynamic model radial clearance Hertzian contact deformation condition monitoring.
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