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Abouel-Seoud, Shawki A.
- Assessment of Passenger Ride Comfort during Vertical Vibration of Mid-Size Saloon and Off-Road Vehicles on Asphalt Roads
Abstract Views :254 |
PDF Views:165
Authors
Affiliations
1 Automotive Engg. Dept., Helwan University, Cairo, EG
1 Automotive Engg. Dept., Helwan University, Cairo, EG
Source
International Journal of Vehicle Structures and Systems, Vol 6, No 1-2 (2014), Pagination: 39-46Abstract
Ride comfort in road vehicles is related to vehicle vibration levels and the perception of passenger fatigue. In this study, vibration in vertical direction on the seat and floor are measured to characterise the ride comfort based on standard formulae and frequency analysis. A mid-size saloon vehicle and an off-road vehicle are driven on smooth, spalled and coarse asphalt road surfaces. To assess the vertical vibrations transmitted to the passengers, vibration dose values, Kurtosis, frequency response functions and power spectral densities of the compartment recorded signals were evaluated. Seat effective amplitude transmissibility value based on vibration RMS and vibration dose values were also evaluated. The results indicate that the vibration dose value increases in proportional to the vehicle speed and road roughness.Keywords
Ride Comfort, Automotive Seat, Vibration Dose Values, Kurtosis, Power Spectral Density.- Assessment of Manual, Automatic and Continuously Variable Transmission Powertrains for Gasoline Engine Powered Midsize Saloon Vehicle
Abstract Views :262 |
PDF Views:125
Authors
Affiliations
1 Automotive Eng. Dept., Helwan University, Cairo, EG
1 Automotive Eng. Dept., Helwan University, Cairo, EG
Source
International Journal of Vehicle Structures and Systems, Vol 7, No 3 (2015), Pagination: 85-91Abstract
Modern integrated powertrains allow great scope for improvements in driveability, emissions and fuel consumption by optimizing the engine speed and load selection to deliver the demanded power. The aim of this study is to assess the exhaust emissions, road performance, road acceleration and fuel consumption of gasoline engine powered vehicle. The proposed emission index and fuel consumption rate are verified through chassis dynamometer tests using the urban part of European drive cycle (ECE-15). A midsize saloon vehicle equipped with an integrated gasoline engine with manual transmission (MT), automatic transmission (AT) and continuously variable transmission (CVT) powertrains. The results indicate that most of the carbon monoxide, carbon dioxide and unburned hydrocarbons emission, driveability and fuel consumption rate were improved for the CVT powertrains.Keywords
Gasoline Engine, Continuously Variable Transmissions, Fuel Consumption, Driveability, Emissions.- Influence of Road Roughness Parameters on Low Frequency Interior Noise in Off-Road and Mid-Size Passenger Vehicles
Abstract Views :228 |
PDF Views:129
Authors
Affiliations
1 Automotive Engg. Dept., Helwan University, Cairo, EG
1 Automotive Engg. Dept., Helwan University, Cairo, EG
Source
International Journal of Vehicle Structures and Systems, Vol 7, No 2 (2015), Pagination: 71-76Abstract
In this paper, assessment and evaluation of vehicle low frequency interior noise, infrasound closer to the threshold of hearing and their potential effects on human health are presented. The vehicle interior noise of off-road and mid-size vehicles was measured while driving on three different asphalt road surfaces. The results indicate that the vehicle acoustic comfort factor (VACF) should be at lower level for a relatively high acoustical comfort. Furthermore, at constant vehicle speed, the kurtosis parameter value is greater in high roughness road surface and is proportional to vehicle speed for every kind of road surface. Kurtosis has inverse effect on the VACF value. The VACF for road surface with higher roughness is lesser than the VACF for smoother road surface at same vehicle speeds.Keywords
Low Frequency Sound, Vehicle Acoustic Comfort Factor, Noise and Vibration, Road Index, Vehicle Speed.- Maintenance Cost Optimization of Faulty Gearbox under Continuous Vibration Measurement Monitoring
Abstract Views :209 |
PDF Views:123
Authors
Affiliations
1 Automotive Engg. Dept., Helwan University, Cairo, EG
1 Automotive Engg. Dept., Helwan University, Cairo, EG