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Fuzzy norm method for evaluating random vibration of airborne platform from limited PSD data 被引量:7
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作者 Wang Zhongyu Wang Yanqing +1 位作者 Wang Qian Zhang Jianjun 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2014年第6期1442-1450,共9页
For random vibration of airborne platform, the accurate evaluation is a key indicator to ensure normal operation of airborne equipment in flight. However, only limited power spectral density(PSD) data can be obtaine... For random vibration of airborne platform, the accurate evaluation is a key indicator to ensure normal operation of airborne equipment in flight. However, only limited power spectral density(PSD) data can be obtained at the stage of flight test. Thus, those conventional evaluation methods cannot be employed when the distribution characteristics and priori information are unknown. In this paper, the fuzzy norm method(FNM) is proposed which combines the advantages of fuzzy theory and norm theory. The proposed method can deeply dig system information from limited data, which probability distribution is not taken into account. Firstly, the FNM is employed to evaluate variable interval and expanded uncertainty from limited PSD data, and the performance of FNM is demonstrated by confidence level, reliability and computing accuracy of expanded uncertainty. In addition, the optimal fuzzy parameters are discussed to meet the requirements of aviation standards and metrological practice. Finally, computer simulation is used to prove the adaptability of FNM. Compared with statistical methods, FNM has superiority for evaluating expanded uncertainty from limited data. The results show that the reliability of calculation and evaluation is superior to 95%. 展开更多
关键词 Expanded uncertainty Fuzzy norm method limited PSD data Random vibration Reliability Variable interval
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Research on Dynamic Tension for Belt Conveyor with Constant Force Automatic Take-Up Assembly
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作者 孟国营 陈京丽 李玉瑾 《Journal of China University of Mining and Technology》 2003年第2期187-191,共5页
The article Provides a dynamic model for belt conveyor. Based on the drive-force of conveyor, take-up tension of take-up assembly, gravity of conveyor belt and material, and friction between belt and idlers, it gives ... The article Provides a dynamic model for belt conveyor. Based on the drive-force of conveyor, take-up tension of take-up assembly, gravity of conveyor belt and material, and friction between belt and idlers, it gives a viscoelastic dynamic equation for conveyor belt. It presents a calculation method of analytic solution to both viscoelastic dynamic equation and geometric dynamic equation when automatic take-up assembly is applied to belt conveyor. The article also makes a study of design method of limiting and eliminating the conveyor belt's elastic vibration. 展开更多
关键词 belt conveyor dynamic equation displacement calculation conveyor belt tension calculation limiting vibration impact
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