|Acquisition Program: ||Forward Sector Torpedo Defense Enabling Capability for POM12|
| ||RESTRICTION ON PERFORMANCE BY FOREIGN CITIZENS (i.e., those holding non-U.S. Passports): This topic is “ITAR Restricted”. The information and materials provided pursuant to or resulting from this topic are restricted under the International Traffic in Arms Regulations (ITAR), 22 CFR Parts 120 - 130, which control the export of defense-related material and services, including the export of sensitive technical data. Foreign Citizens may perform work under an award resulting from this topic only if they hold the “Permanent Resident Card”, or are designated as “Protected Individuals” as defined by 8 U.S.C. 1324b(a)(3). If a proposal for this topic contains participation by a foreign citizen who is not in one of the above two categories, the proposal will be rejected.|| Objective: ||Develop, fabricate, and demonstrate a very compact high powered underwater sonar transducer array capable of directional transmissions at high duty cycle operation, very high reliability, and a low manufacturing cost.
|| Description: ||The performance of naval systems for Anti-Submarine Warfare (ASW) and Counter-Torpedo Detection, Classification, and Localization (CTDCL) is limited by the size, power and detection range of current sensor systems. Although current sensors are adequate for current missions, emerging missions and the need for reducing the volume and weight of sonar transducer arrays while improving reliability under high duty cycle conditions prompts the need for the development of innovative very high power, broadband, directional transmitting arrays while reducing the size and weight compared to traditional transducer arrays. The utilization of projector driver materials that can withstand heat extremes and are very durable and have low material sound velocity (to reduce the size of the transducer) will permit the design of highly compact projector arrays that can generate transmit beams that can be electrically steered.
|| ||PHASE I: Analyze the performance requirements for a hull-mounted and/or towed compact directional array that will be required to transmit at high power at frequencies ranging from mid-frequency sonar to low ultrasonic, capable of forming directional and scanning acoustic beams, and rugged enough to be driven continuously for months at a duty cycle in excess of 20%.
Identify the transducer type and array configuration for meeting these requirements.
Detail the notional design and perform numerical and/or analytical modeling to predict the array performance behavior and, if available, supplement and validate with experimental data on prototype transducers.
|| ||PHASE II: Complete the design of the transducer and array and fabricate prototypes for validation of predicted behavior. After tests of prototype devices, fabricate a full prototype array. This work may become classified in Phase II.
|| ||PHASE III: Undertake engineering analysis of the prototype array to improve the acoustic performance and to apply cost-effective manufacturing techniques as a means to lower total system cost. Design, develop and demonstrate additional prototype arrays at-sea and on Naval vessels for specific applications. Integrate the transducer array with efficient and compact power amplifiers and demonstrate a complete transmit subsystem. The the appropriate technical and programmatic steps to effect a transition into a program of record.
PRIVATE SECTOR COMMERCIAL POTENTIAL/|| ||DUAL-USE APPLICATIONS: This technology will have a host of applications in commercial underwater imaging and fish finding applications.
|| References: ||
1. S.C. Butler and Julie Slaughter, "Vector Projector - A Unidirectional, Magnetostrictive, Compact Sonar Transducer Design", NUWC-NPT Technical Report 11.918, Naval Undersea Warfare Center Division Newport, RI, 1 July 2009 (Unclassified)
2. C.H. Sherman and J.L. Butler, "Transducers and Arrays for Underwater Sound", Springer (2007)
3. J.L. Butler, A.L. Butler and J.A. Rice, "A tri-modal directional transducer", J. Acoust. Soc. Am. 115 (2), pp. 658-665 (February 2004)
4. S.C. Butler, "High Frequency Broadband Projector (HFBBP): Wideband Projector Design and Test Results", NUWC-NPT Technical Memo 08-061, 29 August 2008, Naval Undersea Warfare Center Division Newport, RI (Unclassified)
5. A.D. Waite, "Sonar for Practising Engineers", Wiley (2002)
6. J.L. Butler, "Modal Acoustic Array Transducer Apparatus", U.S. Patent 7,372,776 B2 (13 May 2008)
|Keywords: ||transducer; vector projector; directional beams; array; high power; reliable |