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Oil Debris Signals Enhancement Based On Wavelet Analysis for Wind Turbine Condition Monitoring
Shenggang Yang,Xiaoli Li,Ming Liang 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.10
Oil debris signals are applied to monitor lubricant oil conditions and fault diagnosis of a wind turbine. However, the signals will be influenced by the vibration of transmission mechanism and background noise, hence false alarms and undetected particles will limit sensors ability in examining fine particles in oil debris. This paper presents an approach to enhance the performance of oil debris signals. The de-noising of signals used a wavelet filtering to remove the vibration of a wind turbine, and then set a threshold to remove the background noise which caused by the system of measurement. The effectiveness of this enhanced measurement system is tested by using simulated and experimental signals.
A new foreign exchange model and potion pricing
Shenggang Yang,Juan Peng,Jinqiang Yang 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
A new foreign exchange model is set up in our paper to describe the performance of the exchange rate between two countries, and it catches hold of the characteristics such as mean-reversion, self-similarity and long-term dependence which are widely existent in the foreign exchange market. Fortunately, we obtain the explicit solution of the price of the European foreign exchange option, which makes it convenient to compute the price. Additionally, the quantity relations between the variables and some interesting evidences are explored by comparative static analysis and these provide the valuable empiricism for investing, hedging and evading risk.
Research on the Judgement Method for Catenary Action of Restrained Steel Beams in Fire
Meijing Liu,Shenggang Fan,Yang Guo,Heyang Gui,Runmin Ding,Hang Zhou 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.2
Based on fire tests, a parametric numerical simulation on the catenary action of restrained steel beams in fire was performed by the finite element software ABAQUS. It can be known that axial constraint stiffness, rotational constraint stiffness and load ratio are key factors that affect the catenary action in fire. The formation mechanism of catenary action under ISO-834 standard fire was studied; and the judgement method for catenary action in fire was presented. The results show that: (1) when axial constraint stiffness reaches a certain value, the catenary action of restrained steel beams will occur almost at the same time; (2) with the increase of rotational constraint stiffness or load ratio, the catenary action of steel beams will occur earlier; (3) for restrained steel beams under a small load ratio, the catenary action usually occurs in fire when the mid-span deformation reaches 1/15 of the span; but for restrained steel beams under a large load ratio, the catenary action usually occurs when the mid-span deformation reaches 1/18 of the span; (4) for restrained steel beams with a large rotational constraint stiffness, the judgement method for catenary action in fire can still adopt the same method as above, which will be a little conservative.