Alessandro B. de S. Oliveira

Development of simulation interfaces for evaluation task with the use of physiological data and virtual reality applied to a vehicle simulator

This paper aims at describing an experimental platform used to evaluate the performance of individuals at training immersive physiological games. The platform proposed is embedded in an immersive environment in a CAVE of Virtual Reality and consists on a base frame with actuators with three degrees of freedom, sensor array interface and physiological sensors. Physiological data of breathing, galvanic skin resistance (GSR) and pressure on the hand of the user and a subjective questionnaire were collected during the experiments. The theoretical background used in a project focused on Software Engineering, Biomedical Engineering in the field of Ergonomics and Creative Technologies in order to presents this case study, related of an evaluation of a vehicular simulator located inside the CAVE. The analysis of the simulator uses physiological data of the drivers obtained in a period of rest and after the experience, with and without movements at the simulator. Also images from the screen are captured through time at the embedded experience and data collected through physiological data visualization (average frequency and RMS graphics). They are empowered by the subjective questionnaire as strong lived experience provided by the technological apparatus. The performed immersion experience inside the CAVE allows to replicate behaviors from physical spaces inside data space enhanced by physiological properties. In this context, the biocybrid condition is expanded beyond art and entertainment, as it is applied to automotive engineering and biomedical engineering. In fact, the kinesthetic sensations amplified by synesthesia replicates the sensation of displacement in the interior of an automobile, as well as the sensations of vibration and vertical movements typical of a vehicle, different speeds, collisions, etc. The contribution of this work is the possibility to tracing a stress analysis protocol for drivers while operating a vehicle getting affective behaviors coming from physiological data, mixed to embedded simulation in Mixed Reality.

Estimation of the Geometric Parameters of a Front Double Wishbone Suspension Based on Geometry Formulation

Vehicle suspension stands out as an important subsystem, which allows vertical compliance to the wheels following an uneven road; keeps the proper steer and camber attitudes, resist roll of the chassis and provides comfort for passengers. The suspension subsystem needs to comply with stability, handling and optimum steering based on an appropriate suspension geometry.Nowadays, the use of simulation software in automotive design has increased. However, the cost and complexity of such software can make them unavailable to those working in the domain, especially the young designers working in vehicle’s student competition (Baja SAE®).Thus, this paper aims to propose a methodology for assessing a frontal Double Wishbone suspension, which is based on a set of analytical equations implemented computationally at Matlab®. The formulae are developed considering simple concepts of algebra, trigonometry and geometry.The input data are the Cartesian coordinates (x, y, z) of predefined points, which are obtained from the CAD design and the bound/rebound travel.The main results are the simple analytical formulae, for the most important suspension’s geometric parameters: caster, camber and toe angles.These analytical results are validated with MSC ADAMS®, particularly its add-on specialized for the automotive industry ADAMS/Car®, showing good agreement.Copyright

Development of an educational impedance tube: Experimental vibroacoustic characterization.

One of the great difficulties encountered by designers who work with room acoustics is to know the absorption coefficient of the material to be employed in the project. The tube wave, also known as impedance tube, is a device which determines this coefficient and also determines the acoustic impedance of materials. These values are essential for choosing products that best fit the needs of an acoustic treatment project, either indoors, machinery, pipes, or mufflers. This paper presents the first studies to construction and characterization of an educational impedance tube (Kundt’s tube) called TIGaD (demonstrative impedance tube of the Faculty at Gama). In this first phase we will present a dimensional study of the tube, its construction details, an experimental analysis of its vibroacoustic characteristics, and, finally, its limitations in frequency range. This project belongs to the educational area since this experimental apparatus is being developed to equip the laboratory of acoustics and vibration (...