Noise measurements of the F-35C on an aircraft carrier flight deck

2016 ◽  
Vol 140 (4) ◽  
pp. 3098-3098
Author(s):  
Nourhan K. Abouzahra ◽  
Alan T. Wall ◽  
Richard L. McKinley ◽  
Billy J. Swayne ◽  
Michael J. Smith ◽  
...  
Keyword(s):  
Aircraft Carrier ◽  
Noise Measurements ◽  
Flight Deck

scholarly journals An Extended Flexible Job Shop Scheduling Model for Flight Deck Scheduling with Priority, Parallel Operations, and Sequence Flexibility

2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Lianfei Yu ◽  
Cheng Zhu ◽  
Jianmai Shi ◽  
Weiming Zhang
Keyword(s):  
Differential Evolution ◽  
Job Shop ◽  
Job Shop Scheduling ◽  
Time Budget ◽  
Differential Evolution Algorithm ◽  
Mixed Integer ◽  
Aircraft Carrier ◽  
Evolution Algorithm ◽  
Improved Differential Evolution Algorithm ◽  
Flight Deck

Efficient scheduling for the supporting operations of aircrafts in flight deck is critical to the aircraft carrier, and even several seconds’ improvement may lead to totally converse outcome of a battle. In the paper, we ameliorate the supporting operations of carrier-based aircrafts and investigate three simultaneous operation relationships during the supporting process, including precedence constraints, parallel operations, and sequence flexibility. Furthermore, multifunctional aircrafts have to take off synergistically and participate in a combat cooperatively. However, their takeoff order must be restrictively prioritized during the scheduling period accorded by certain operational regulations. To efficiently prioritize the takeoff order while minimizing the total time budget on the whole takeoff duration, we propose a novel mixed integer liner programming formulation (MILP) for the flight deck scheduling problem. Motivated by the hardness of MILP, we design an improved differential evolution algorithm combined with typical local search strategies to improve computational efficiency. We numerically compare the performance of our algorithm with the classical genetic algorithm and normal differential evolution algorithm and the results show that our algorithm obtains better scheduling schemes that can meet both the operational relations and the takeoff priority requirements.

Flight Deck Design of the Next Generation Aircraft Carrier

2000 ◽  
Vol 112 (3) ◽  
pp. 69-75 ◽  
Author(s):  
W. Baker ◽  
S. D. Brennan ◽  
M. Husni
Keyword(s):  
Next Generation ◽  
Aircraft Carrier ◽  
Flight Deck Design ◽  
Flight Deck

Optimization of a columnar vortex generator installed over an aircraft carrier ski-jump ramp

2019 ◽  
Vol 234 (1) ◽  
pp. 223-230
Author(s):  
Rafael Bardera
Keyword(s):  
Vortex Generator ◽  
Wind Tunnel Testing ◽  
Low Velocity ◽  
Aircraft Carrier ◽  
Recirculation Bubble ◽  
Columnar Vortex ◽  
Flow Disturbances ◽  
Image Velocimetry ◽  
Field Velocity ◽  
Flight Deck

Aircraft performances over aircraft carriers are essential in modern navies. Take-off operation is critical due to the short runway available. The ski-jump ramp is a useful system that allows to operate under safe conditions. However, the sharp edge at the end of the runway provokes a region with recirculation bubble and low velocity producing strong flow disturbances. Hence, the aircraft performances are affected and the pilot’s workload is augmented. Previous researches showed that columnar vortex generator reduces the recirculation bubble generated over the end of flight deck. This article presents an in-depth experimental study performed by wind tunnel testing in order to determine the relation between the columnar vortex generator size and the recirculation bubble reduction. Particle image velocimetry is used to investigate the flow field velocity and flow structure around the ski-jump ramp as a non-intrusive experimental technique. Encouraging results were found for the biggest columnar vortex generator studied.

Aerodynamic Flow Field above the Flight Deck of an Aircraft Carrier and its Influence on the Take-Off Performances

2018 ◽  
Author(s):  
Rafael Bardera-Mora ◽  
Adelaida Garcia-Magariño ◽  
Angel Rodriguez-Sevillano ◽  
Miguel Angel Barcala-Montejano
Keyword(s):  
Flow Field ◽  
Aircraft Carrier ◽  
Flight Deck

scholarly journals Hearing Health Risk in a Population of Aircraft Carrier Flight Deck Personnel

2004 ◽  
Vol 169 (6) ◽  
pp. 429-432 ◽  
Author(s):  
Glen W. Rovig ◽  
Bruce K. Bohnker ◽  
John C. Page
Keyword(s):  
Health Risk ◽  
Aircraft Carrier ◽  
Hearing Health ◽  
Flight Deck

scholarly journals A Fuzzy Path Selection Strategy for Aircraft Landing on the Carrier

2018 ◽  
Author(s):  
Xichao Su ◽  
Yu Wu ◽  
Jingyu Song ◽  
Peilong Yuan
Keyword(s):  
Decision Making ◽  
Group Decision Making ◽  
Group Decision ◽  
Experimental Studies ◽  
Essential Elements ◽  
Path Selection ◽  
Selection Strategy ◽  
Aircraft Carrier ◽  
Aircraft Landing ◽  
Flight Deck

Landing is one of the most dangerous tasks in all the operations on the aircraft carrier, and the landing safety is very important to the pilot and the flight deck operation. The problem of landing path selection is studied in this paper as there several candidates corresponding to different situations. A fuzzy path selection strategy is proposed to solve the problem considering the fuzziness of environmental information and human judgment, and the goal is to provide the pilot with more reasonable decision. The strategy is based on Fuzzy Multi-attribute Group Decision Making (FMAGDM), which has been widely used in industry. Firstly, the background of the path selection problem is given. Then the essential elements of the problem are abstracted to build the conceptual model. A group decision-making method is applied to denote the preference of each decision maker for each alternative route, and the optimal landing path under the current environment is determined taking into account the knowledge and the weight of both decision makers. Experimental studies under different setups, i.e., different environments, are carried out. The results demonstrate that the proposed path selection strategy is validated in different environments, and the optimal landing paths corresponding to different environments can be determined.

Aircraft carrier noise measurements of a high-performance fighter jet

2016 ◽  
Vol 139 (4) ◽  
pp. 2205-2205
Author(s):  
Alan T. Wall ◽  
Richard L. McKinley ◽  
Michael R. Sedillo ◽  
Billy J. Swayne ◽  
Michael J. Smith ◽  
...  
Keyword(s):  
High Performance ◽  
Aircraft Carrier ◽  
Noise Measurements

scholarly journals Sound Level Measurements in Berthing Areas of an Aircraft Carrier

2019 ◽  
Vol 63 (8) ◽  
pp. 918-929
Author(s):  
Nicholas Cody Schaal ◽  
Maria Majar ◽  
Andrew Hunter
Keyword(s):  
Sound Level ◽  
Noise Levels ◽  
Aircraft Carrier ◽  
Flight Operations ◽  
Close Proximity ◽  
Hearing Recovery ◽  
Us Navy ◽  
Noise Measurements ◽  
Time Periods ◽  
Hazardous Noise

Abstract Background Personnel assigned to aircraft carriers work and live in environments where hazardous noise areas and hearing recovery spaces such as sleeping areas are in close proximity to one another. Hazardous noise exposure occurring during on-duty time periods and elevated noise levels during off-duty periods in sleeping areas may be prohibiting adequate hearing recovery, thus potentially leading to hearing loss and may lead to adverse effects on sleep, leading to crew-member fatigue. This investigation characterizes Equivalent sound level (Leq) and standardized octave band center frequency noise levels according to berthing (sleeping) area location during flight operation and nonflight operation time periods on a US Navy aircraft carrier. In addition, the investigation compares noise measurements in sleeping areas to noise levels associated with auditory rest and poor sleep quality and quantity. Methods Noise levels were measured in berthing areas aboard a US Navy Nimitz-class aircraft carrier during a routine at-sea period. Sixty noise measurements were taken in eight sleeping locations. Leq in decibels ‘A’ weighted (dBA) and noise levels from 16 to 16 000 Hz in (dB) were measured during flight operations [Leq (flt ops)] and nonflight operations [Leq (nonflt ops)]. Leq was also measured according to sleep area shipboard locations of forward (FWD) Leq (FWD), middle (MID) Leq (MID), and rear (AFT) Leq (AFT). These data were compared to the 70 dBA American Conference of Governmental Industrial Hygienists (ACGIH) threshold limit value (TLV) for effective quiet areas. In addition, these data were compared to noise levels associated with hearing loss and sleep parameters. Statistical analysis was conducted with R version 3.5.2 using an alpha level of 0.05. Results Leq (flt ops) in sleeping areas was a statistically significant (P < 0.05) 6.4 dBA higher than the Leq (nonflt ops). Leq (FWD) and Leq (MID) in sleeping areas was a statistically significant (P < 0.05) 15.2 and 15.0 dBA higher, respectively, than the Leq (AFT) noise levels. Mean noise levels at standardized center (1/1) octave bands were highest between 500 and 4000 Hz, ranging from 65.2 to 69.8 dB. A total of 72% of all area Leq measurements exceeded the 70 dBA ACGIH TLV classified as effective quiet to allow for temporary threshold shift recovery. All noise measurements exceeded the World Health Organization’s noise threshold where adverse effects on sleep begin. Discussion/Conclusions Results suggest that sleeping area location in close proximity to relatively high noise sources and activities occurring on an aircraft carrier (i.e. flight operations) increase noise levels in sleeping areas. These findings raise serious concerns since high noise exposures both on duty and during off-duty/sleeping periods may inhibit auditory recovery from hazardous noise exposures. In addition, results suggest noise levels in sleeping areas are high enough to evoke negative sleep effects.

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