![]() A determination is made of the controlling radiated noise offenders including those which are speed and depth dependent. In particular, the radiated noise signature of the ship is measured under various operating conditions. These trials are conducted at the beginning of and at various times throughout each ship's operating cycle in accordance with reference (b) and provide a broad range of baseline measurements for the ship. These efforts should lead to improved survey procedures and will be incorporated into future changes to this chapter.Ħ.2.1.1 Naval Sea Systems Command Acoustic Trials. Because of an increased emphasis in recent years, a number of new initiatives are being pursued within the technical community to develop new and improved measurement procedures and equipment that will assist Ship's Force in more effectively assessing the effects of noise deficiencies on their radiated noise signature. It should be kept in mind that although the implications of a degraded noise signature are fundamentally tactical in nature, the primary method of preserving a ship's acoustic advantage is through an aggressive and effective planned and corrective noise reduction maintenance program. As deficiencies are identified, Ship's Force needs to have an understanding of the extent to which an identified deficiency can affect the ship's radiated noise signature and the procedures required to effect corrective action. Then, throughout the remainder of its operating cycle, the ship requires the tools and procedures necessary to monitor its signature against the baseline. ![]() As a ship begins its operating cycle, a series of acoustic surveys are conducted to characterize the baseline noise signature. ![]() Reduction of the radiated noise signature of a submarine platform is a key element to the tactical employment of the ship. In addition, a discussion of the model shipboard noise reduction program and available training programs are presented.Ħ.1.2 Background. Surveys discussed in reference (a) are briefly summarized, as well as several additional survey techniques available and essential to an effective noise reduction program. Reference (a) discusses the various acoustic surveys to be conducted on ships in order to establish their baseline noise signatures and to monitor those signatures throughout the operating cycle. It identifies the acoustic surveys required to assess the radiated noise signature of a ship and summarizes the responsibilities and requirements for the onboard surveys necessary to be performed on a regular basis to maintain the submarine in its most quiet configuration.Ħ.1.1 Scope. This chapter provides the requirements for an effective onboard noise reduction program during the ship's operating cycle. (h) COMSUBLANT/COMSUBPACINST C3500.1 - Submarine Force Training Manualī COMSUBPAC Beartrap Acoustic Radiated Trialsĭ Pre-Undocking/Deployment Under Hull Sound Silencing SurveyĦ.1 PURPOSE. (g) NAVEDTRA 10500 - Catalog of Navy Training Courses (f) Divers Pre-Deployment Noise Inspection Procedures Manual (e) NAVSEA S9073-A2-HBK-010 - Resilient Mount Handbook (d) NAVSEA S9078-AA-HBK-010 - Distributed Isolation Material (DIM) Mount Design Handbook (c) COMSUBLANT/COMSUBPACINST 9460.4 - Submarine Towed Array Operations (b) NAVSEAINST C9073.2 - Acoustical Survey of Submarines (a) NAVSEA S9073-AW-SNC-010 - Ship Acoustical Surveys for Submarines VOLUME IV PART III CHAPTER 6 SUBMARINE NOISE REDUCTION
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