منابع مشابه
Propeller Induced Structural Vibration through the Thrust Bearing
Propeller induced structural vibration through the thrust bearing is an important source for low frequency shipboard noise and underwater sound radiation from a submarine hull. Such vibration is investigated using a scaled experimental model. This research concentrates on the experimental characterization of propeller force, hydrodynamic force of the thrust bearing and vibration transmission th...
متن کاملMulti-axis Vibration Mitigation Properties of Seat Cushions during Military Propeller Aircraft Operational Exposures
There have been increasing complaints of annoyance, fatigue, and musculoskeletal pain during prolonged exposures to propulsion-generated vibration in military propeller aircraft. The objective of this study was to evaluate the effects of seat cushions on mitigating the higher frequency (>10 Hz) multi-axis vibration associated with Navy E-2C Hawkeye operations. An E2C crew seat was used in the l...
متن کاملSeat vibration in military propeller aircraft: characterization, exposure assessment, and mitigation.
INTRODUCTION There have been increasing reports of annoyance, fatigue, and even neck and back pain during prolonged operation of military propeller aircraft, where persistent multi-axis vibration occurs at higher frequencies beyond human whole-body resonance. This paper characterizes and assesses the higher frequency vibration transmitted to the occupants onboard these aircraft. METHODS Multi...
متن کاملA propeller-like uranyl metallomesogen.
Uranyl triflate forms with three imidazo[4,5-f]-1,10-phenanthroline ligands a propeller-like complex that exhibits a hexagonal columnar phase. The ligand is not liquid-crystalline, but a mesophase is induced upon complex formation with the uranyl salt. The thermal behavior has been investigated by polarizing optical microscopy and by high-temperature X-ray diffraction. A model of the stacking o...
متن کاملPropeller Flaps: A Literature Review.
BACKGROUND/AIM Since their introduction in 1991, propeller flaps are increasingly used as a surgical approach to loss of substance. The aim of this study was to evaluate the indications and to verify the outcomes and the complication rates using this reconstructing technique through a literature review. MATERIALS AND METHODS A search on PubMed was performed using "propeller flap", "fasciocuta...
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ژورنال
عنوان ژورنال: Bureau of Standards Journal of Research
سال: 1934
ISSN: 0091-1801
DOI: 10.6028/jres.012.051