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Improving cam profile design optimization based on classical splines and dynamic model 被引量:8
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作者 夏必忠 刘新成 +1 位作者 尚欣 任世远 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第8期1817-1825,共9页
Cam profiles play an important part in the performance of cam mechanisms. Syntheses of cam profile designs and dynamics of cam designs are studied at first. Then, a cam profile design optimization model based on the s... Cam profiles play an important part in the performance of cam mechanisms. Syntheses of cam profile designs and dynamics of cam designs are studied at first. Then, a cam profile design optimization model based on the six order classical spline and single DOF(degree of freedom) dynamic model of single-dwell cam mechanisms is developed. And dynamic constraints such as jumps and vibrations of followers are considered. This optimization model, with many advantages such as universalities of applications, conveniences to operations and good performances in improving kinematic and dynamic properties of cam mechanisms, is good except for the discontinuity of jerks at the end knots of cam profiles which will cause vibrations of cam systems. However, the optimization is improved by combining the six order classical spline with general polynomial spline which is the so-called "trade-offs". Finally, improved optimization is proven to have a better performance in designing cam profiles. 展开更多
关键词 cam profile design spline optimization trade-off
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ON DESIGN METHOD OF THE PRECISION CAM PROFILE WITH RANDOM PROCESSING ERRORS 被引量:4
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作者 Zhao ZhisuMechatronics Engineering andAutomation Institute,National University ofDefense Technology,Changsha 410073, China 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2003年第1期10-12,共3页
Based on probability and statistic, a design method of precision cam profileconcerning the influence of random processing errors is advanced. Combining the design with theprocess, which can be used to predict that cam... Based on probability and statistic, a design method of precision cam profileconcerning the influence of random processing errors is advanced. Combining the design with theprocess, which can be used to predict that cam profiles will be successfully processed or not in thedesign stage, design of the cam can be done by balancing the economization and reliability. Inaddition, an fuzzy deduction method based on Bayers formula is advanced to estimate processingreasonable of the designed precision cam profile, and it take few samples. 展开更多
关键词 Cam profiles design Random processing errors Probability and statistic
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Study on Design Rainstorm Profile in Liuzhou City:Chicago Method
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作者 Xie Dong Su Xiaoling +5 位作者 Liu Lei Liang Chunrong Liu Zhourong Li Yu Lan Qiu Ren Le 《Meteorological and Environmental Research》 CAS 2018年第4期24-29,共6页
The design rainstorm profile is the basis of scientifically and rationally planning and designing urban drainage system, which can provide scientific theoretical basis and accurate design parameters for municipal cons... The design rainstorm profile is the basis of scientifically and rationally planning and designing urban drainage system, which can provide scientific theoretical basis and accurate design parameters for municipal construction, water and planning departments. In this paper, the minute-minute rainfall process data at Liuzhou National Meteorological Observation Station from 1975 to 2014 were used. Chicago method was used to analyze and study design rainstorm profile in urban district of Liuzhou, and the profiles of the rainfalls lasting for 30 , 60 , 90, 120, 150, and 180 min were obtained. The results showed that the design rainstorm profile with the same duration in each reappearance period was consistent in Liuzhou, and short-time rainfall profile roughly showed single-peak shape. The peak of each short-time design rainstorm profile was almost in 1/3 part of the whole rainfall process, and the intensity of rainfall increased with the prolonging of the recurrence period. The rainfall intensity at the peak in the same reproducing period showed 11 decrease - increase -decrease" as the duration increased, and the peak value of rainfall lasting for 120 min was the maximum. 展开更多
关键词 Liuzhou City design rainstorm profile Chicago method
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Comprehensive longevity technology of Baosteel No.3 BF
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作者 LIANG Lisheng 《Baosteel Technical Research》 CAS 2014年第3期58-64,共7页
Baosteel No. 3 BF has been running smoothly and stably for more than 18 years and has become China' s longest-life blast furnace, producing many advanced economical and technical indexes. Comprehensive longevity tech... Baosteel No. 3 BF has been running smoothly and stably for more than 18 years and has become China' s longest-life blast furnace, producing many advanced economical and technical indexes. Comprehensive longevity technology has been developed in terms of the design, operation, and maintenance of the No. 3 BF during the prolonged period of research and practice. To obtain stable and smooth operation and to prolong the campaign life, the following measures have been taken: appropriate designing of the furnace profile and cooling system; improving raw material quality and optimizing the operating system; improving the cooling intensity and water quality;and adopting various longevity maintenance measures to ensure the safety of the body and the hearth temperature. 展开更多
关键词 blast furnace long campaign profile design cooling system maintenance
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