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Technical Paper

Using an Experimental Approach to Estimate Damping Coefficient

2006-11-21
2006-01-2507
To model the dynamic behavior of a vehicle, even if is used a simple two degree of freedom model [4], some variables must be known to establish the equations of movement as, geometric dimensions, mass, spring rate constants and viscous damping coefficients. This last variable is not usually available in specialized literature; in consequence numerical simulations of motion models can be as accurate as the estimative of its value. To bypass this limitation an equipment of one degree of freedom was designed and constructed to impose to a mass/damper/spring system the necessary conditions to generate an experimental underdamped output. Using the logarithmic decrement approach on experimental data obtained is possible to better estimate the viscous damping coefficient. The theoretical underground is explicited and the experimental procedures are fully explained.
Technical Paper

Experimental and Numerical Analysis of an Off-road Vehicle Suspension

2003-11-18
2003-01-3650
The suspension behavior affects significantly the performance of a vehicle. An optimal condition must guarantee the best compromise among conflicting performance indices pertaining to the vehicle suspension system, that is, comfort, road holding and working space. Therefore, in the development phase of a vehicle design a complete study should be done to verify the actual improvement of optimal suspension characteristics and adjustments in the vehicle overall performance. This work presents a dynamic analysis of an off-road conventional automotive suspension, which was developed for an off-road vehicle type Mini-Baja. A two-degree of freedom dynamic model was developed to study the behavior of the suspension and the influence of the main parameters in the transmissibility of accelerations to the passengers. The model considers the coupling between the front and rear suspension system.
Technical Paper

Dynamic Experimental Analysis of a Mini-Baja Vehicle Front Suspension

2001-03-05
2001-01-3846
This work presents a dynamical experimental stress and strain analysis of an off-road vehicle front suspension, which was developed in CEFET-RJ to the Mini-Baja / SAE-Brazil competition. Initially, a finite element model was developed to identify the critical points of the structure. Afterwards, electric strain gages were bonded at the most critical points to measure the dynamic strains due to an impact load. The data obtained through an A/D converter with an instrumentation software, was used to evaluate the maximum loads acting on the suspension. In this case, the success obtained with this method, indicates that it can be used as an effective tool for the design and improvement for Mini Baja vehicle.
Technical Paper

Analysis of the Transmissibility of the Rear Suspension of a Mini-Baja Vehicle

2002-11-19
2002-01-3506
This work presents a dynamical analysis of the transmissibility of an off-road vehicle rear suspension, which was developed in CEFET-RJ for the Mini-Baja / SAE-Brazil competition. A finite element model was developed to identify the critical points of the structure. Afterwards, electric strain gages were bonded at the most critical points to measure the dynamic strains due to an impact load. Accelerometers were bonded before and after rear suspension system to measure the main transmissibility characteristics of the suspension. The data obtained through an A/D converter with instrumentation software was used to evaluate the transmissibility of the rear suspension and other important dynamic characteristics. Finally, a simple two-degree of freedom model was developed to study the behavior of the rear suspension and the influence of the main parameters in the transmissibility of accelerations and loads to the structure.
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