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Technical Paper

Trucks Ride Simulation - Tuning Optimization

In order to improve the product development efficiency, nowadays, the usage of simulation tools has become almost mandatory. The number of different settings, tested during the suspension tuning, for example, can grow reasonably in the same amount of time. Such a situation would be impossible experimentally. In this context, this work presents a truck model carried out in a multi-body environment (Adams) in order to evaluate aspects of vehicle ride comfort. The model was created with all project information available. Typical tracks, used for ride subjective evaluation, are modeled as track profiles and added to the multi-body model. The model is then validated against experimental data. The measurement setup used as well as the test conditions are fully detailed, as well as the comparison of the data acquire with the simulation results. Once with the validated model, it can be explored in order to extract all information required for a robust project.
Technical Paper

Different Behavior from car and truck drivers during nighttime driving in the Brazilian market

Nighttime driving behavior differs from that during the day because of differences in the driver's field of view. At night, drivers must rely on their vehicle headlamps to illuminate the roadway. It is essential then that the driver is able to see the environment and road conditions in front of him. This paper presents the needs of the driver's (car and truck) due to the environment and road conditions from the state of Sao Paulo (Brazil). A survey has been done to compare the needs from the truck and car driver under different road conditions. The results show the necessity to tailor the beam pattern according to the driver needs, providing safer nighttime driving according to the driver's and market needs.
Technical Paper

Benefits and implications of the LED AFS on Heavy Trucks in the South American region

The vehicular illumination system has had, in the past decades, huge technological advances such as the use of an adaptive front-lighting system (AFS), which represents an industry breakthrough in lighting technology. AFS is designed to incorporate two independent light sources: a high-output halogen projector for the main beam and a secondary row of light emitting diodes (LEDs) that illuminates almost instantaneously. This combination distributes the light beam evenly and consumes less power than conventional lights. The technical challenge is how to effectively control its use. This paper will present the impact on the South American truck driver's behavior due to road, environment and weather conditions. This concept will demonstrate that as the vehicle turns, the LEDs illuminate at a rate and intensity determined by the degree and speed of the turn. The concept is to add light, making night time driving safer and a better environment as well due to the LEDs.
Technical Paper

Pass-by-Noise Development for Trucks Considering Cooling and Airflow Management

The work carried out with external noise insulation has been demanding high importance in vehicle concept since the second External Noise Regulation in Brazil (Conama 001/ 1993). The engineering effort shall increase significantly for near future developments due to the new Regulation (Conama 272 / 2000) with more stringent limits. The effect over vehicle systems beyond noise requirements is not restricted to the addition of shields and insulators. The airflow restriction created by the noise shields surfaces may become a huge cooling issue. This situation is usually observed on trucks designed for tropical markets and submitted to severe environments. Lessons learned in a current development are the basis of the proposed methodology. Vehicle and lab sound intensity noise source ranking tests are suggested as development tools. The paper also presents a pass-by-noise development strategy that includes CAE airflow and cooling management tools.