Safety and comfort analysis of a 3-D vehicle model with optimal non-linear active seat suspension

Bouazara, Mohamed; Richard, Marc J.; Rakheja, Subhash

doi:10.1016/j.jterra.2004.10.003

Cited by 70 publications

(39 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Isso demonstra que o assento, bem como a estrutura do trator, foram capazes de absorver bem os impactos, criando uma boa condição de trabalho para o operador da máquina. Bouazara et al (2006) …”

Section: Resultsunclassified

Vibração e ruído emitidos por dois tratores agrícolas

Cunha

Duarte

Souza

2012

Idesia

View full text Add to dashboard Cite

ResumoA operação de tratores agrícolas impõe grande estresse físico e mental aos tratoristas. Este trabalho teve como objetivo avaliar os níveis de vibração e ruído emitidos por dois tratores agrícolas, defasados temporalmente, em diferentes rotações do motor (1700, 1850 e 2000 rpm). Nas avaliações foram utilizados um trator de 60,35 kW, fabricado em 1988, e um trator de 89,06 kW, fabricado em 2009, ambos não-cabinados e tracionando um arado de discos. As avaliações de ruído foram feitas com um medidor de pressão sonora (decibelímetro), no posto de operação da máquina. As avaliações de vibração foram feitas no assento do trator, utilizando um sistema de aquisição automática de dados com três acelerômetros, nos sentidos vertical e horizontal. Os resultados permitiram as seguintes conclusões: a operação de aração com os dois tratores apresentaram níveis de ruído acima do limite de 85 dB (A) para 8 horas de exposição diária, estabelecido pela NR-15, fazendo-se necessário o uso de dispositivos de proteção auricular durante sua execução. O trator mais antigo apresentou níveis de vibração que podem comprometer a saúde, segurança, conforto e eficiência do tratorista. O mesmo não ocorreu para o trator mais novo.Palavras-chave: máquinas agrícolas, ergonomia, saúde ocupacional. AbstrAct Tractor driving imposes a lot of physical and mental stress upon the operator. The aim of this work was to evaluate the vibration and noise levels emitted by tractors with different ages, under different motor rotations (1700, 1850 and 2000 rpm IntroduçãoO problema da transmissão da vibração dos tratores agrícolas aos seus operadores vem sendo pesquisado há anos. Contudo, ainda existe uma clara necessidade de desenvolver sistemas para sua prevenção (Tiemessen et al., 2007). Devido à inexistência de amortecedores e molas, como em veículos urbanos, o assento do tratorista tem importante papel em minimizar essa vibração, sendo, portanto, importante componente do trator (Jain et al., 2008). De acordo com Tewari e Dewangan (2009), a redução da vibração, além de diminuir o estresse do operador, permite melhor qualidade de vida e aumento da jornada de trabalho sem causar excesso de fadiga. Bluthner et al. (2006) afirmam que a vibração pode levar a sérios danos a espinha dorsal dos operadores.Nas décadas passadas pouca atenção foi dada a esse problema, contudo, com a introdução da restrição a exposição do trabalhador a níveis excessivos de vibração na legislação da Comunidade

show abstract

Section: Resultsunclassified

Vibração e ruído emitidos por dois tratores agrícolas

Cunha

Duarte

Souza

2012

Idesia

View full text Add to dashboard Cite

show abstract

“…The full vehicle model is the "seven degree of freedom" model presented in [45]. The vehicle body mass M s (sprung mass) is assumed to be a rigid body with bounce, pitch, and roll motions denoted by x s , θ, and φ, respectively.…”

Section: Integrated Modelmentioning

confidence: 99%

The Control of an Active Seat Suspension Using an Optimised Fuzzy Logic Controller, Based on Preview Information from a Full Vehicle Model

2018

View full text Add to dashboard Cite

Abstract:The use of suspension preview information obtained from a quarter vehicle model (QvM) to control an active seat has been shown by the authors to be very promising, in terms of improved ride comfort. However, in reality, a road vehicle will be subjected to disturbances from all four wheels, and therefore the concept of preview enhanced control should be applied to a full vehicle model. In this paper, different preview scenarios are examined, in which suspension data is taken from all or limited axles. Accordingly, three control strategies are hypothesized-namely, front-left suspension (FLS), front axle (FA), and four wheel (4W). The former utilises suspension displacement and velocity preview information from the vehicle suspension nearest to the driver's seat. The FA uses similar preview information, but from both the front-left and front-right suspensions. The 4W controller employs similar preview information from all of the vehicle suspensions. To cope with friction non-linearities, as well as constraints on the active actuator displacement and force capabilities, three optimal fuzzy logic controllers (FLCs) are developed. The structure of each FLC, including membership functions, scaling factors, and rule base, was sequentially optimised based on improving the seat effective amplitude transmissibility (SEAT) factor in the vertical direction, using the particle swarming optimisation (PSO) algorithm. These strategies were evaluated in simulation according to ISO 2631-1, using different road disturbances at a range of vehicle forward speeds. The results show that the proposed controllers are very effective in attenuating the vertical acceleration at the driver's seat, when compared with a passive system. The controller that utilised suspension preview information from all four corners of the car provided the best seat isolation performance, independent of vehicle speed. Finally, to reduce the implementation cost of the "four suspension" controller, a practical alternative is developed that requires less measured preview information.

show abstract

“…This will not only save the environment, but the smooth technique could bring comfort to the travelers. Besides, the study from Bouazara et al (2006) showed that the seat model are related to the safety and the comfort of the bus and would increase the intention of using PBT among the users. These studies collectively support the relationship between safety and comfort towards individual intention to use public transport service.…”

Section: Safety and Comfort Of The Busmentioning

confidence: 99%

Improving Traffic Infrastructure in a Developing Country: An Investigation into the Usage of Public Bus Transport in Malaysia

Soh¹,

Wong²,

Chong³

et al. 2014

Industrial Engineering and Management Systems

View full text Add to dashboard Cite

Economic growth with rising household income has put more vehicles on the roads worsening traffic congestion, road accidents, and air and noise pollution. This situation is further aggravated by the potential working population who choose to drive to work instead of taking public transportation. Public bus transport (PBT) plays an important role in alleviating these problems. PBT is underutilized in Malaysia, and there is an opportunity to increase ridership without substantial investment. Therefore, this study was conducted to investigate the factors that influence the use of PBT in Malaysia. The data were collected using structured questionnaires from 400 respondents. The results of the analysis show that the twin factors consisting of perceived satisfaction of and perceived importance by users towards safety and comfort of facilities and services offered by PBT are significantly related to intention to use those services. The satisfaction of availability of season tickets, the importance of reliability of bus schedule and time table, and the importance of ticket pricing are also significant. By providing insights for both public bus operators and the government, this paper contributes to mitigate the underutilization of PBT in Malaysia and the consequences of putting more vehicles on the roads. From the theory perspective, this paper also contributes by extending the theory of reasoned-action to transportation studies.

show abstract

Safety and comfort analysis of a 3-D vehicle model with optimal non-linear active seat suspension

Cited by 70 publications

References 14 publications

Vibração e ruído emitidos por dois tratores agrícolas

Vibração e ruído emitidos por dois tratores agrícolas

The Control of an Active Seat Suspension Using an Optimised Fuzzy Logic Controller, Based on Preview Information from a Full Vehicle Model

Improving Traffic Infrastructure in a Developing Country: An Investigation into the Usage of Public Bus Transport in Malaysia

Contact Info

Product

Resources

About