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Viewing 1 to 30 of 2545
2015-10-06
Event
The need to reduce aerodynamic drag arising from cooling and thermal flows may increase as total vehicle drag is reduced. The complexity of this problem area will require advancements in both experimental and computational tools. Specific topics to be discussed are experimental and computational results as well the correlation of data sets from various sources for both the localized flow conditions as well a complete vehicle in operation.
2015-10-06
Event
Commercial vehicle aerodynamics and fuel economy are greatly affected by transient and interfering flows. As the aerodynamic sophistication of commercial vehicles increase the importance of these phenomena in vehicle design will increase. Specific topics to be discussed are guidelines and methods for the modeling and simulation of these effects in vehicle design, experimental evaluation and the operational performance of commercial vehicles.
2015-10-06
Event
Aerodynamic drag reduction is and will continue to be a primary means to achieving significant improvements in commercial vehicle freight efficiency. This session will review current and near term aerodynamic technology benefits and design sensitivities with a view toward improving efficiency and reducing emissions of medium and heavy commercial ground vehicles. Discussions will include data obtained from wind tunnels, on-road testing and computational tools.
2015-10-06
Event
Future commercial vehicles will need to expand the use of advanced aerodynamic flow-control technologies to achieve significant levels of aerodynamic drag reduction and vehicle fuel economy improvements achieved with currently available with vehicle shaping and add-on fairings. This session will address passive and active flow control techniques for the cost effective management of aerodynamic drag with a view toward improving efficiency and reducing emissions.
2015-10-06
Event
For aerodynamic technology to mature it is critical that the use of aerodynamic tools is based on critical governing aerodynamic and fluid dynamic criteria. In aerodynamics the most critical criteria is Reynolds number. Specific topics to be discussed are guidance and methods for Reynolds number and boundary layer assessment, modeling and simulation for aerodynamic evaluation and operational performance of commercial vehicles.
2015-10-06
Event
This session will address aerodynamic testing requirements, technologies, facilities, and methods with a view toward improving efficiency and reducing emissions of medium and heavy commercial ground vehicles. Specific topics to be discussed are aerodynamic related corrections, correlations and assessments for various data sources including wind tunnel, CFD, and on-track/road testing.
2015-10-06
Event
The recognition and acceptance of aerodynamics as a major player in trucking efficiency has increased significantly over the past decade. The effective integration of aerodynamic concepts and technologies into future vehicles will require a multi-disciplinary/multi-design point approach. This session will address the current status and future role of aerodynamic design methods, tools and processes.
2015-10-06
Event
The SuperTruck demonstration program is nearing completion. Preliminary status reports show that aerodynamic drag reduction is critical to achieving the program goal of 50% improvement in freight efficiency. This session will highlight the aerodynamic technologies and vehicle integration strategies employed in the program to optimize the benefit of aerodynamics in future vehicle design.
2015-10-06
Event
The use of CFD by the commercial vehicle industry has grown significantly in the past decade. This session will address steady state and transient aerodynamic modeling and simulation with Navier-Stokes and Lattice-Boltzmann based methods with a view toward improving efficiency and reducing emissions of medium and heavy commercial ground vehicles.
2015-09-22
Event
Although UAS aerodynamics is for the most part similar to that of manned aircraft, some designs requirements are unique for micro to small and high altitude, long-endurance vehicles. This session discusses critical aspects of aerodynamics for fixed and rotary wing UAS along with lighter than air technologies.
2015-09-22
Event
General Aerodynamics topics for flight vehicles of all types, including flow physics, applied aerodynamics of wings, tails, rotors, control surfaces, aero loads and wind tunnel testing.
2015-09-22
Event
This session will cover flight vehicle performance and sizing, conceptual/preliminary design, MDO, aero-propulsion integration, design education.
2015-09-22
Event
This session will cover aero Stability & Control, loads, aeroelastics & flutter, flight control laws/flying qualities.
2015-09-22
Event
This session will cover aero Stability & Control, loads, aeroelastics & flutter, flight control laws/flying qualities.
2015-07-01
Journal Article
2015-01-9111
Lasse G. Andersen, Jesper K. Larsen
Abstract Coast-down modeling has been widely used to assess vehicle aerodynamic drag and rolling resistance by fitting a vehicle resistance model to speed measurements and thereby get an estimate on model parameters. Here a coast-down model is used for assessing how road surface characteristics influence rolling resistance. Parameter estimation as well as an extensive perturbation analysis of the parameter fit with respect to data noise has been performed. Functional Data Analysis (FDA) is introduced and discussed as a tool for this. It is concluded that FDA is a powerful tool for 1) approximating derivatives, 2) assessing the degree of smoothing of the data 3) handling noise sources in the perturbation analysis and 4) enabled numerical solutions of the coast-down Ordinary Differential Equation (ODE) model. Investigations showed that MPD was the most important parameter compared to IRI although MPD data required smoothing for optimal model fit.
2015-06-25
Event
This session is to present numerical and experimental work pertaining to noise due to flow around the vehicle body, such as flow-induced interior noise, flow over protrusions, sunroofs, windows, noise from ventilation systems, or flow noise in exhaust system. Papers on aerodynamics alone without sound are excluded. Numerical studies may include new models or models based on existing theory as long as they are adequately supported by experimental or theoretical verifications.
2015-06-24
Event
This session is to present numerical and experimental work pertaining to noise due to flow around the vehicle body, such as flow-induced interior noise, flow over protrusions, sunroofs, windows, noise from ventilation systems, or flow noise in exhaust system. Papers on aerodynamics alone without sound are excluded. Numerical studies may include new models or models based on existing theory as long as they are adequately supported by experimental or theoretical verifications.
2015-06-24
Event
This session is to present numerical and experimental work pertaining to noise due to flow around the vehicle body, such as flow-induced interior noise, flow over protrusions, sunroofs, windows, noise from ventilation systems, or flow noise in exhaust system. Papers on aerodynamics alone without sound are excluded. Numerical studies may include new models or models based on existing theory as long as they are adequately supported by experimental or theoretical verifications.
2015-06-15
Technical Paper
2015-01-2329
Paolo Di Francescantonio, Charles Hirsch, Piergiorgio Ferrante, Katsutomo Isono
Abstract A new method called Adaptive Spectral Reconstruction (ASR) for the stochastic reconstruction of broadband aeroacoustic sources starting from steady CFD analyses is presented and applied to the evaluation of the noise radiated by a model automotive side mirror. The new approach exploits some ideas from both SNGR and RPM, and for some aspects can be considered as a sort of mixing between the two methods since it permits to reconstruct both the frequency content of the turbulent field (as done by SNGR) and the spatial cross correlation (as done by RPM). The turbulent field is reconstructed with a sum of convected plane waves, but two substantial differences are introduced in respect of SNGR. The first difference concerns the spatial variation of the parameters that define each wave, that depends on the wavelength of each wave, rather than being kept constant or related to the CFD correlation length.
2015-06-15
Technical Paper
2015-01-2326
Denis Blanchet, Anton Golota
Abstract Recent developments in the prediction of the contribution of wind noise to the interior SPL have opened a realm of new possibilities. The main physical mechanisms related to noise generation within a turbulent flow and the vibro-acoustic transmission through the vehicle greenhouse is nowadays better understood. Several simulation methods such as CFD, FEM, BEM, FE/SEA Coupled and SEA can be coupled together to represent the physical phenomena involved. The main objective being to properly represent the convective and acoustic component within the turbulent flow to ensure proper computation of the wind noise contribution to the interior SPL of a vehicle.
2015-06-15
Technical Paper
2015-01-2301
Maxwell Hill, Dan Luo, Mark Moeller
Abstract Wind noise can be a significant event for automotive design engineers. The greenhouse glass plays an important role in the wind noise process. Robust estimates of the greenhouse glass damping are necessary for both understanding and modeling the role of the glass in the wind noise process. One unanswered question is whether the aerodynamic loads affect the window glass damping. To make this determination a method to assess the operational damping is required. The civil engineering community uses the random decrement technique to assess operational damping due to wind loads. The random decrement technique has been shown to be a normalized autocorrelation function. In this paper the damping is estimated directly from the autocorrelation function. In the first section the relationship between the damping and autocorrelation function is examined for white noise excitation. A single oscillator is examined as the first case. Extension to higher modal densities is discussed.
2015-06-15
Technical Paper
2015-01-2080
Roger J. Aubert
Abstract The entire process from ice accretion to ice impact with ice shedding in between still needs refinement. This paper presents key points illustrating the need for improvements in understanding the mechanical properties of ice accretion on helicopter rotor systems.
2015-06-15
Technical Paper
2015-01-2118
Sergey Alekseyenko, Michael Sinapius, Martin Schulz, Oleksandr Prykhodko
Abstract The results of experimental investigation of the icing processes of NACA 0015 airfoil are presented. The experiments have been carried out with the help of a high-speed camera at the icing/deicing facility at the Institute of Adaptronic and Functional Integration of the Technical University of Braunschweig. The investigation objective is the study of interaction between supercooled large droplets and the icing airfoil surface as well as physical phenomena occurring during the icing process. Evolution of the initial phase of ice growth process over time is observed, the general structure of ice accretion and its alteration along the airfoil is examined. Experiments have been carried out within a wide temperature range. Photos of the specific moments of the icing process have been analyzed. Splashing events and water movement on the icing surface have been observed.
Viewing 1 to 30 of 2545

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