At the first Shock and Vibration Symposium in 1947, mechanical shock was defined as “a sudden and violent change in the state of motion of the component parts or particles of a body or medium resulting from the sudden application of a relatively large external force, such as a blow or impact.” Since then the specific words used have changed somewhat but the meaning remains the same. Most analysts treat shock as a transient vibration. No matter how it is described or what source produced it, the effects of mechanical shock on structures and equipment create major design problems for a wide variety of systems.
This 5-day course will provide a comprehensive treatment of practical shock design and analytical shock simulation with special emphasis on requirements, methods, and procedures for naval qualification for shock produced by underwater explosion by both test and analytical means. Participants will increase their knowledge and understanding of the analytical and experimental tools that are available for shock design and qualification particularly with respect to requirements that are imposed for shipboard equipment. Classroom lectures will provide a basic review of vibration and shock theory and will present the analytical and experimental methodology in the context of particular design applications. Analytical lectures will emphasize the physical significance of the results. Examples and case histories will be used as illustrations of design approaches; workshop problems that involve class participation will be used to advantage throughout the course. Class members will be encouraged to propose real design problems. The instructors will provide guidance for solutions or the problems may be used as class exercises.
The course will be especially useful to those concerned with shock design and/or qualification of structures, machinery, and equipment for U.S. Navy combatant vessels. Current applicable acquisition programs include DDG 51, DDG 1000, LPD 17, SSN 774, OHIO Replacement, CVN 78, LHA 6, LCS 1&2, FF, as well as fleet upgrades and service life extensions.
Although this course is aimed primarily at shock design applications on naval vessels, the analysis and design techniques presented are equally applicable to design and modeling related to seismic shock, blast induced ground shock, pyroshock, gun fire shock, ballistic shock and vehicle mobility shock.
Topics covered include:
- Introduction to Mechanical Shock
- Review of Basic Vibration Theory and SDOF Systems
- Navy Shock Qualification Process
- Shock Qualification by Extension
- Shock Qualifications by Test
- Underwater Shock Phenomena
- Shock Qualification by DDAM
- Practical Design Considerations
- Optimum Foundation Design
- Shock Measurement
- Overview of the Shock Response Spectrum (SRS)
- 2-Dimensional Normal Mode Theory
- 3-Dimensional Normal Mode Theory
- Multi-Degree-of-Freedom Systems
- Special Design and Analysis Tools
- Use of Finite Element Analysis for DDAM Transient Analysis
- Comparison of MDOF System Response from Transient Analysis and SRS/Mode Superposition
Dr. Edward Alexander
Dr. Alexander has 46 years of experience in the defense and nuclear industries. He has Mechanical Engineering degrees from Oregon State University (BS), Carnegie-Mellon University (MS) and University of Minnesota (PhD) and is a licensed PE in the State of Pennsylvania. He is a former member of the Industrial Affiliates Board for Oregon State University’s Department of Mechanical, Industrial & Manufacturing Engineering and current member of the Shock & Vibration Exchange Advisory Committee. Dr. Alexander has done extensive research in the synthesis of acceleration wave forms to be compatible with prescribed shock response and energy spectra. He currently manages the Applied Mechanics Section of the BAE Systems Platforms & Services, Weapon Systems Site, in Minneapolis, MN.
Mr. Hill has over 36 years of experience in ship design, survivability and weapons effects, including underwater explosion (UNDEX) analysis, structural design, environmental qualification, and testing. He has extensive experience in: application of analytical techniques for simulation of dynamic loading and response, testing and measurement methods, vibration of structure and machinery, and design optimization for the dynamic environment. He has participated in UNDEX design, qualification, and verification e orts on every major U.S. Navy surface ship program since the early 80’s. He has Bachelors and Masters degrees in Mechanical Engineering and is a Licensed Professional Engineer. He is currently manager of the Ship Integrity Section at Alion Science and Technology in Alexandria, Virginia.
Mr. Morris is a Mechanical Engineer and has served HI-TEST Laboratories, Inc. as a test engineer for over 25 years. He regularly designs interface text fixtures and auxiliary systems to support lightweight and medium weight shock testing and vibration test operations. He has designed special test platforms and unique auxiliary systems. Mr. Morris leads the lightweight, medium weight and vibration testing from designing fixtures to writing the test report. Mr. Morris’ excellent organizational skills have awarded him the opportunity to coordinate all planning and scheduling for test projects issued to HI-TEST. He serves as lead engineer for MIL- STD-167 vibration testing, MIL- STD-740 structural and airborne noise testing, and MIL-S-901D lightweight and medium weight shock testing.