Impact Injury and The High Speed Craft Acquisition Process

Peterson, Ronald S; Bass, Cameron M.

doi:10.3940/rina.hf.2005.20

Cited by 2 publications

(3 citation statements)

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“…However, the level of discomfort shall be assumed proportional to the injury risk. Peterson and Bass [60] and De Alwis [61] provide reviews of the various impact injury risk parameters applied to high-speed watercraft. The following parameters considered in the study are explained and derived in the subsequent sections: dynamic response index (DRI), peak seat acceleration, peak lumbar acceleration (from ISO 2631-5 [62]), bandwidth-limited (BL) power-spectral density (PSD), and the average acceleration onset derivative (average jerk).…”

Section: Human Comfort Parametersmentioning

confidence: 99%

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Synthesis and Optimization of Mechanical Networks with Inerters in Landing Gear for Improved Landing Performance and Vibration Control at Touchdown Considering Airframe Flexibility

Stachiw¹

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The landing impact case results in the development of significant loads and accelerations within the airframe. Accurate knowledge of the landing loads is not only necessary for the stress analysis and design of the airframe, but also for designing strategies to mitigate the vibratory loads and improve the ride quality. Perceived passenger comfort is dependent both on the magnitude of the acceleration experienced by the passengers and on the frequency content of the vibrations. Using a flexible airframe model of a 150-passenger regional jet with cantilevered landing gear in a tricycle configuration, this study optimizes various single-port (two-terminal) passive mechanical networks that consist of an arrangement of springs, dampers, and inerters to minimize passenger discomfort and peak forces applied to the aircraft. The performance of the mechanical networks is compared to a baseline oleopneumatic shock absorber. First, the importance of including airframe flexibility effects was demonstrated as the peak landing gear loads, the loading regime, and the frequency response of the structure were altered when compared to the equivalent rigid model. Next, eight candidate layouts were optimized, then the observations from this exercise were used to synthesize a mechanical network with a desired frequency response. All considered mechanical networks demonstrated the ability to control the frequency content of the input loading, thus resulting in a reduction in accelerations and an improvement in all comfort parameters used in this study over the oleo-pneumatic baseline.This research was financially supported in part by the Natural Sciences and Engineering Research Council of Canada both by the Canada Graduate Scholarship-Master's and Discovery Grants. In addition, entrance scholarships to the Mechanical and Aerospace Engineering department, and Teaching Assistantships helped fund my research.

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Section: Human Comfort Parametersmentioning

confidence: 99%

“…The BL PSD method was introduced by Peterson and Bass at the Naval Surface Warfare Centre -Panama City [60]. The BL PSD is calculated as the average PSD value in the 4 Hz to 8 Hz bandwidth using a 4096-point Hamming window with 50% overlap.…”

Section: Bandwidth-limited Psdmentioning

confidence: 99%

Synthesis and Optimization of Mechanical Networks with Inerters in Landing Gear for Improved Landing Performance and Vibration Control at Touchdown Considering Airframe Flexibility

Stachiw¹

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“…The bandwidth-limited power spectral density (BL PSD) was introduced by Pe-terson et al [51] with a bandwidth of 4 to 8 Hz, and an extended bandwidth of 4 to 10 Hz was used by Kyrollos et al [52]. For these results, the bandwidth is extended further to 12 Hz to cover the range of higher amplitude signal found from 8 to 12 Hz.…”

Section: Analysis Of Discrete Eventsmentioning

confidence: 99%

A Study of Vibration and Noise During Neonatal Patient Transport by Ground Ambulance

Kehoe

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Often, preterm infants requiring specialized care are transported to a higher care facility by air or ground ambulance. Studies have shown higher rates of mortality and morbidity in outborn patients, and concerns have been raised with respect to the vibration and noise environment during transport. To address these issues, Carleton University is working on a multi-year collaborative research project focused on three pillars: characterization of vibration and noise during transport, laboratory experimentation, and investigation of mitigation approaches. This study expands on existing characterization of vibration and noise by focusing on different road classifications and the impact of discrete events such as railway crossings and pothole strikes. In addition, a novel approach of full vehicle testing is demonstrated along with the evaluation of preliminary mitigation solutions. Finally, a method for determining the optimal location for a transport system or estimating acceleration values throughout an ambulance is presented.

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Impact Injury and The High Speed Craft Acquisition Process

Cited by 2 publications

References 0 publications

Synthesis and Optimization of Mechanical Networks with Inerters in Landing Gear for Improved Landing Performance and Vibration Control at Touchdown Considering Airframe Flexibility

Synthesis and Optimization of Mechanical Networks with Inerters in Landing Gear for Improved Landing Performance and Vibration Control at Touchdown Considering Airframe Flexibility

A Study of Vibration and Noise During Neonatal Patient Transport by Ground Ambulance

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