TAILIEUCHUNG - A study on the estimation of sea-waves influence on the working depth of towed underwater vehicle

The article presents the problem associated with the influence of seawaves on the working depth of a towed underwater vehicle (TUV) including: defining transfer function (TF) of the towing cable - underwater vehicle system; analyzing the sea-wave’s features, modeling and defining the TF of filter which forms the sea-waves; estimating the TFs of the system (TC - UV) and researching the influence of sea-waves to the TUV’s working depth in the time domain. | A study on the estimation of sea-waves influence on the working depth of towed underwater vehicle Nghiên cứu khoa học công nghệ A STUDY ON THE ESTIMATION OF SEA-WAVES INFLUENCE ON THE WORKING DEPTH OF TOWED UNDERWATER VEHICLE Nguyen Phu Dang1*, Pham Tuan Thanh1, Tran Xuan Tinh1, Dao Sy Luat2 Abstract: The article presents the problem associated with the influence of sea- waves on the working depth of a towed underwater vehicle (TUV) including: defining transfer function (TF) of the towing cable - underwater vehicle system; analyzing the sea-wave’s features, modeling and defining the TF of filter which forms the sea-waves; estimating the TFs of the system (TC - UV) and researching the influence of sea-waves to the TUV’s working depth in the time domain. Simulating and evaluating the influence of sea-waves on the TUV’s vertical oscillation for a specific system will be considered at the end of the article. The received results can be used for designing and manufacturing TUVs, building a regulator to stabilize the TUV’s working depth against sea-waves and damper, as well as designing other specialized underwater devices. Keywords: Towed underwater vehicle, Transfer function, Sea-waves model, Objects with distributed parameters, Estimation of transfer function, Sea-wave’s spectral density. 1. INTRODUCTION Recently, Towed Underwater Vehicles (TUV) have been powerfully developed due to their good capabilities of exploring the ocean environment. In comparison to Autonomous Underwater Vehicles (AUV), TUVs are able to work much longer and much deeper under the water, to communicate much easier and more exacte to the ship, and to survey the ocean floor more quickly. Basically, to operate a TUV, it is necessary to have a 3-part system including ship, towed cable (TC), and underwater vehicle (UV) as the illustration in Fig. 1. The towed cable is an essential device for both mechanical and electrical connections. .

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