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An 18 foot tall jacket type structure was tested for three dimensional forces and deck deflections using regular and irregular waves of up to 2.5 feet in height. Theoretical studies for both regular and irregular wave forces are presented in conjunction with experimental results. In addition, a similar comparison for deck deflection and frequency response is presented in this report. Results indicate base shear, lift force, and overturning moment calculations using the range of hydrodynamic coefficients recommended by the American Petroleum Institute are in general agreement with experimentally determined values for wave frequencies between 0.3 and 0.8 Hz. Deck deflection measurements were significantly greater than those calculated using standard structural matrix techniques. The difference is concluded to be the result of inadequate analytical description of the test structure joints using a rigid joint analysis. (Author).
Power-transferring equipment was designed to change from a-c to d-c power prior to shot time. The d-c power was supplied by storage batteries to motors driving 110-volt 60-cycle single-phase alternators which operated all the instrumentation.
A clear, practical approach to making your organization more responsive to change Response Ability: The Language, Structure, and Culture of the Agile Enterprise helps companies keep up with an ever-changing business environment driven by the explosion and rapid application of new knowledge and increasing connectivity and communication. This twenty-first-century business primer identifies corporate characteristics that facilitate change and shows managers how to instill these competencies in every part of any organization. This user's manual for the new economy shows companies how to reconfigure themselves to respond quickly when a business situation demands rapid changes in organization, distribution logistics, production capability, innovation capability, resource procurement, product design, service strategy, or any other activity or competency. It provides a strategic context for lean operating practices, puts knowledge management and the learning organization in perspective, and offers a framework within which to apply today's best advice on new business practices and strategic focus. This timely guide is the ultimate resource for enterprises struggling to adjust to rapidly changing economic conditions and for managers at any level who must introduce agility into a department, division, or entire organization. It is also an excellent supporting reference and tutorial for all others who will take part in the transformation.
This text examines the interaction between blast pressure and surface or underground structures, whether the blast is from civilian, military, dust and natural explosions, or any other source.
Many of the aircraft that form the backbone of the U.S. Air Force operational fleet are 25 years old or older. A few of these will be replaced with new aircraft, but many are expected to remain in service an additional 25 years or more. This book provides a strategy to address the technical needs and priorities associated with the Air Force's aging airframe structures. It includes a detailed summary of the structural status of the aging force, identification of key technical issues, recommendations for near-term engineering and management actions, and prioritized near-term and long-term research recommendations.