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Wang F.,Shanghai JiaoTong University | Zhu K.,715th Institute of China Shipbuilding Industry Corporation | Zhu Z.,715th Institute of China Shipbuilding Industry Corporation | Huang G.,Shanghai JiaoTong University
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2013

In this paper, sensitivity analysis on the steady-state towing performance of a faired cable system was conducted through a numerical simulation method, which is mainly used to study the effect of some model coefficients of faired cable towing system. After giving the detailed mathematical model of a faired cable towing system and considering three steady state motion response parameters, i. e. the towing depth, towing tension, and kiting deviation as sensitivity criteria, the effect of model parameters changes; including cable drag coefficient, mass per unit length, weight, and hydrodynamic force centers, etc., on the towing performance was computed. The simulation results show that cable drag coefficient, mass per unit length, and towed body's mass have remarkable effect on the towing performance, and the lateral deviation of buoyancy, weight and hydrodynamic force centers are strongly related to the kiting phenomenon.


He S.,715th. Institute of China Shipbuilding Industry Company | Hao F.,715th. Institute of China Shipbuilding Industry Company | Liu P.,715th. Institute of China Shipbuilding Industry Company | Sang W.,715th. Institute of China Shipbuilding Industry Company | And 2 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2015

A novel high precision fiber Bragg grating (FBG) pressure sensor is proposed. The sensor is based on the structure of elastic diaphragm. The pressure sensing FBG (PS FBG) is connected directly to the diaphragm. Axial displacement occurs under pressure and compresses the PS FBG to realize pressure measurement. The temperature compensating FBG (TC FBG) departs form the diaphragm. So it is insensitive to external pressure. Both FBGs are applied with certain pretensions. Therefore, their response to environmental temperature is nearly the same. Accordingly, real-time temperature compensation can be realized. Without strain delivery among structures, the proposed sensor responses to external pressure immediately and ensures a high precision measurement. In the experiment, the pressure measurement fluctuation of the sensor is less than ±0.7%F.S. during temperature variation. The pressure precision reaches 0.19%F.S. in the rage of 25 MPa. ©, 2015, Science Press. All right reserved.

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