scholarly journals Improvement of Boeing Bump Method Considering Aircraft Vibration Superposition Effect

2021 ◽  
Vol 11 (5) ◽  
pp. 2147
Author(s):  
Shifu Liu ◽  
Yu Tian ◽  
Le Liu ◽  
Peng Xiang ◽  
Zhekai Zhang
Keyword(s):  
Dynamic Responses ◽  
International Roughness Index ◽  
Pavement Preservation ◽  
Long Wave ◽  
Airport Pavement ◽  
Pavement Evaluation ◽  
Roughness Index ◽  
Response Thresholds ◽  
Roughness Evaluation ◽  
Superposition Effect

Pavement evaluation is critical for the decision-making process of pavement preservation and rehabilitation. Roughness is a key airport pavement characteristic that has been linked to impacts such as safety and service life. The Boeing Bump is one of the few roughness evaluation methods that has been developed specifically for runways. Although it is superior to the widely used International Roughness Index (IRI), it does not take into account the superposition effect of continuous runway bumps. Based on the ADAMS/Aircraft virtual prototype platform, this paper establishes and verifies five typical models (B737, B747, B757, B777, and B787) and then analyzes the most unfavorable speed (in terms of aircraft vibration) of each model and the dynamic responses caused by multiple bumps. The original Boeing Bump is improved and optimized by determining dynamic response thresholds for the various aircraft types. The results show that the revised Boeing Bump is more realistic than the original version, especially with regard to medium and long wave bands.

scholarly journals Airport pavement roughness evaluation based on cockpit and center of gravity vertical accelerations

TRANSPORTES ◽  
2020 ◽  
Vol 28 (1) ◽  
pp. 147-159
Author(s):  
Jorge Braulio Cossío Durán ◽  
José Leomar Fernandes Júnior
Keyword(s):  
Center Of Gravity ◽  
International Roughness Index ◽  
Airport Pavement ◽  
Pavement Roughness ◽  
Roughness Index ◽  
Roughness Evaluation ◽  
Vertical Accelerations

Pavimentos irregulares são geralmente responsáveis por acelerações verticais (VA) que afetam as aeronaves, aumentam a distância de parada e dificultam a leitura dos instrumentos de navegação na cabine dos pilotos. O International Roughness Index (IRI) e o Boeing Bump Index (BBI) são utilizados atualmente para quantificar a irregularidade longitudinal dos pavimentos aeroportuários e identificar seções que demandam atividades de manutenção e reabilitação (M&R). Contudo, tais índices baseiam-se apenas nas respostas dinâmicas de um automóvel a 80 km/h às irregularidades longitudinais dos pavimentos rodoviários, bem como nas características físicas das irregularidades (comprimento e altura), respectivamente, ignorando o efeito das VA nas aeronaves. Ainda, limites críticos atuais, sugeridos por Sayers & Karamihas e ANAC para IRI (2,0 e 2,5 m/km, respectivamente) e pela FAA para BBI (1,0) podem subestimar a condição real do pavimento. Este artigo avalia o efeito da irregularidade longitudinal nas acelerações na cabine dos pilotos (VACP) e no centro de gravidade (VACG). O software ProFAA permitiu calcular os índices e simular as VA em 4 aeronaves representativas atravessando 20 pistas de pouso e decolagem em 10 velocidades de taxiamento variando de 37 a 370 km/h. Comparações estatísticas e análises de regressão foram realizadas. Principais resultados mostram que VACP é 50% maior do que VACG e que ultrapassa o limite critico de 0,40 g quando o IRI e BBI estão acima de 3,7 m/km e 0,20, respectivamente. Um estudo de caso é também apresentado para comparar esses limites e sugere que a tomada de decisão baseada em IRI e VA pode trazer diferenças significativas na quantidade de atividades de M&R.

scholarly journals Optimization of International Roughness Index Model Parameters for Sustainable Runway

2021 ◽  
Vol 13 (4) ◽  
pp. 2184
Author(s):  
Yu Tian ◽  
Shifu Liu ◽  
Le Liu ◽  
Peng Xiang
Keyword(s):  
Frequency Response ◽  
Dynamic Responses ◽  
Model Parameters ◽  
Response Distribution ◽  
Iri Model ◽  
International Roughness Index ◽  
Pavement Roughness ◽  
Study Results ◽  
Roughness Index ◽  
Roughness Evaluation

Pavement roughness is a critical airport pavement characteristic that has been linked to impacts such as safety and service life. A properly defined roughness evaluation method would reduce airport operational risk, prolong the life of aircraft landing gear, and optimize the decision-making process for pavement preservation, which together positively contribute to overall airport sustainability. In this study, we optimized the parameters of the International Roughness Index (IRI) model to resolve the current poor correlation between the IRI and aircraft vibration responses in order to adapt and extend the IRI’s use for airport runway roughness evaluation. We developed and validated a virtual prototype model based on ADAMS/Aircraft software for the Boeing 737–800 and then employed the model to predict the aircraft’s dynamic responses to runway pavement roughness. By developing a frequency response function for the standard 1/4 vehicle model, we obtained frequency response distribution curves for the IRI. Based on runway roughness data, we used fast Fourier transform to implement the frequency response distribution of the aircraft. We then utilized Particle Swarm Optimization to determine more appropriate IRI model parameters rather than modifying the model itself. Our case study results indicate that the correlation coefficient for the optimized IRI model and aircraft vibration response shows a qualitative leap from that of the original IRI model.

Pavement Roughness Indices Related to Riding Comfort

2014 ◽  
Vol 505-506 ◽  
pp. 180-183 ◽  
Author(s):  
Zong Tao Zhang ◽  
Quan Man Zhao ◽  
Wan Qiao Yang
Keyword(s):  
Evaluation Method ◽  
Ride Comfort ◽  
Vehicle Model ◽  
International Roughness Index ◽  
Poor Predictor ◽  
Pavement Roughness ◽  
Vibration Model ◽  
Roughness Index ◽  
Roughness Evaluation ◽  
Pitch Movement

The most widely used pavement roughness index is the international roughness index (IRI), but it is a poor predictor of ride comfort. In addition, the rider has not yet been included in the vehicle model used to evaluate pavement roughness. In this paper, in order to evaluate the comfort of the rider directly and consider the effects on ride comfort of pitch movement, a five-degree-freedom vibration model was built when a rider was added to a pitch-plane vehicle model. The vertical weighted root-mean-square (RMS) acceleration of the rider was suggested to be pavement roughness indices, which were related to ride comfort, respectively. The new roughness indices were calculated and a new pavement roughness evaluation method was developed.

scholarly journals The Comparison of Measured and Simulated Dynamic Responses of Vehicles Indicated by Road Pavement Unevenness

2015 ◽  
Vol 11 (1) ◽  
pp. 10-20
Author(s):  
Martin Decký ◽  
Matúš Kováč ◽  
Peter Kotek
Keyword(s):  
Dynamic Systems ◽  
Design Method ◽  
Dynamic Responses ◽  
Asphalt Pavements ◽  
Heavy Vehicle ◽  
Dynamic Effects ◽  
International Roughness Index ◽  
Road Pavement ◽  
Roughness Index ◽  
Quarter Car

Abstract The article presents the comparison of measured and simulated dynamic responses of heavy vehicle which are indicated by road pavement unevenness. This unevenness was represented by speed control bumps, potholes and stochastic pavement unevenness. The objective simulations were realized through the medium Quarter- Car Simulation by means of application of simulated theory of dynamic systems. The reliability of used model was verificated with comparison of measured and simulated values of sprung mass T815 vehicle accelerations. In the article, there are presented courses of total vertical forces of Quarter-Car Simulation for the first, the second and the fourth classification degree of unevenness, which was considered through the world's respected parameter IRI (International Roughness Index). Obtained simulated dynamic effects of the vehicle on the pavement were used for modification of a relevant Slovak design method of asphalt pavements.

Airport pavement evaluation systems for maintenance strategies development: a systematic literature review

2020 ◽  
Author(s):  
Ingrid Rebouças de Moura ◽  
Franco Jefferds dos Santos Silva ◽  
Luis Henrique Gonçalves Costa ◽  
Edmon Darwich Neto ◽  
Herbert Ricardo Garcia Viana
Keyword(s):  
Literature Review ◽  
Systematic Literature Review ◽  
Maintenance Strategies ◽  
Evaluation Systems ◽  
Airport Pavement ◽  
Pavement Evaluation

Effects of international roughness index on vehicle emissions

2021 ◽  
Vol 15 (1) ◽  
pp. 41
Author(s):  
Ernesto Ferreira Nobre Junior ◽  
Arielle Elias Arantes ◽  
Priscilla Oliveira Azevedo
Keyword(s):  
Vehicle Emissions ◽  
International Roughness Index ◽  
Roughness Index
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