ISO 2631-5 addresses exposure to vibration and multiple shocks when a person is seated. The adverse health effects of prolonged exposure is analyzed, particularly in cases where injuries in the lumbar spine are concerned. The calculation of the lumbar spine response assumes that the person is seated in an upright position and does not voluntarily rise from the seat during the exposure.
Boats operating in the open ocean are subject to large shock and vibration forces. Exposure to such forces can lead to discomfort, spinal injuries and performance degradation, especially when exposed to forces in the vertical axis. SHOXS seats are specifically designed and engineered to reduce the risk of operator injury and impact exposure in harsh marine conditions.
Recent Davidson Laboratory basic studies of planing hull hydrodynamics have produced a wealth of technology which is not generally available to the small-boat design profession. Included are studies related to the preplaning resistance of transform-stern hulls, the effectiveness of trim control flaps, the effect of bottom warp on planing efficiency, the influence of reentrant transform forms, and the seakeeping of planing hulls.
The present paper consolidates these results in a form suitable for design purposes and illustrates their application in predicting planing performance in smooth and rough water.
As a service to our community, we are committed to helping our clients by developing the tools they need to make informed decisions in selecting the seating solutions that best fit their application.
Industry Standard Seat Performance Evaluation Criteria (ISSPEC) is CDG’s industry leading vision to facilitate industry collaboration by creating the framework of an unbiased, scientifically valid and economical laboratory performance testing method of shock mitigating seats.
ISSPEC is not meant to replace existing field testing methods– rather it is an economical, repeatable, simple and useable means to evaluate, compare and categorize shock mitigating seat performance in the early stages of design and procurement processes.
Participants were SBU operational personnel, drawn from SBU-12, SBU-20 and SBU-22. One hundred and fifty four SBU personnel participated in this study. They all had the Special Boat Naval Enlistment; Codes: (NEC) 5350 (Special Warfare Combatant Crewman [SWCC] basic), 5351 (SWCC Intermediate), or 5352 (SWCC advanced).
Extreme high speed craft are constantly evolving as counter-terrorism and enforcement roles change in the military, coast guard and police sector. The professional sector needs a shock mitigation strategy or crews will not be capable of doing their job when they arrive at their destination. The definition of shock mitigation is, 'to make a violent collision or impact less intense'. With an effective shock mitigation strategy the helmsman, crew and passengers benefit from increased comfort and reduced injury while the organization has increased operational efficiency.
SHOXS competitors utilize passive suspension systems, not true semi-active mitigation systems. SHOXSDUAL2 is the world’s first true semi-active seat mitigation system in use. This independent study provides an in-depth look at the disadvantages of passive suspension systems as well as important conclusions for why true semi-active suspension systems mark a significant improvement on older passive system technology.