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Design Optimization and Aerodynamic Analysis of a Hybrid Blended Wing Body- VTOL Unmanned Aerial Vehicle

Delhi Technological University-Pranav Bahl, Vikas Rastogi, Amit bainsla, Nitin Sharma
  • Technical Paper
  • 2020-01-0472
To be published on 2020-04-14 by SAE International in United States
Unmanned Aerial Vehicles (UAVs) can be effectively used to serve humanitarian relief efforts during environmental disasters. Designing such UAVs presents challenges in optimizing design variables such as maximizing endurance, maneuverability and payload capacity with minimum launch and recovery area. The Blended Wing Body (BWB) is a novel aircraft configuration offering enhanced performance over conventional UAVs. Designing a blended wing configuration UAV takes into account interdependency between aerodynamic performance and stability. Designing BWB is peculiar and is investigated in this paper with a view to achieve an aerodynamically stable and structurally sound configuration. The designed UAV is a hybrid of a tailless blended-wing-body and a tri-copter configuration with two forward tilt motors for transition into cruise flight after vertical take-off and back to multirotor while landing (VTOL-Vertical Take Off and Landing). The BWB is iteratively optimized in XFLR-5 for Dynamic and static stability. The wing design was optimized for aerodynamic and structural fitness in MATLAB using Meta-heuristic optimization methodology based on genetic evolutionary algorithm. The 3D CAD design was conceived on SolidWorks and analyzed in Pressure…
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Optimization of Structural Adhesives in BIW to Improve Full Vehicle Crash Performance

FCA US LLC-Malli Kartheek Yalamanchili, Nitin Sharma, Kevin Thomson
Published 2017-03-28 by SAE International in United States
The crashworthiness of body-in-white (BIW) plays a vital role in full vehicle crash performance. The structural integrity of BIW is controlled via strength of the spot welds and adhesives that are the primary entities to join sheet metal. The number of welds and amount of adhesives in the entire BIW directly affects the cost and the cycle time of the BIW; which makes them a good candidate for optimization. However optimization of the welds and/or adhesives not only reduces the number of connections but also provides the opportunity to improve the structural performance and mass saving by placing them optimally for the structural responses.This paper discusses the optimization of full vehicle structural performance for the small overlap crash event using the length of adhesives in the BIW as parameters. Included in the study were length of the adhesives and gage variables, defined in the front-end structure of the vehicle. A parametric model based design of experiments (DOE) study was performed using ANSA and iSight. The Metamodel based optimization process was used that involves an automated…
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Simplified Approach for Optimizing Lightening Holes in Truck Frames for Durability Performance

FCA US LLC-Ramachandra bhat, Nitin Sharma, Clifford Rivard, Kevin Thomson
Published 2017-03-28 by SAE International in United States
During development of new vehicles, CAE driven optimizations are helpful in achieving the optimal designs. In the early phase of vehicle development there is an opportunity to explore shape changes, gage reduction or alternative materials as enablers to reduce weight. However, in later phases of vehicle development the window of opportunity closes on most of the enablers discussed above. The paper discusses a simplified methodology for reducing the weight in design cycle for truck frames using parametric Design of Experiments (DOE). In body-on-frame vehicles, reducing the weight of the frame in the design cycle without down gaging involves introducing lightening holes or cutouts while still maintaining the fatigue life. It is also known that the lightening holes might cause stress risers and be detrimental to the fatigue life of the component. Thus the ability to identify cutout locations while maintaining the durability performance becomes very critical. This paper describes a method of effectively locating these lightening holes on the truck frame, thereby reducing the weight of the vehicle while preserving the durability performance.The process to…
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Use of Parametric Approach to Optimize Structural Adhesives and Spot Welds in CAE Based Optimization

FCA US LLC-Sudeep Chavare, Kevin Thomson, Nitin Sharma
Published 2017-03-28 by SAE International in United States
Use of parametric approach to optimize CAE models for various objectives is a common practice these days. In addition to load members, the connection entities such as welds and adhesives play an important role in overall performance matrix. Hence adding the connection entities to the pool of design variables during an optimization exercise provide additional opportunity for design exploration. The method presented in this paper offers a unique approach to parameterize adhesive lines by evaluating the possibility of using structural adhesives as intermittent patches rather than continuous lines. The paper discusses two optimization studies 1) structural adhesive patches along with spot weld pitch as design variables, and 2) structural adhesive patches with gage variables. These studies include the Body in White (BiW) and Trimmed Body in White (TBiW) assessments. The goal of the first study is to reduce total length of structural adhesive, while the goal of the second study is to save mass. The constraint,k for both studies is to maintain baseline NVH performance.
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A New Weight Reduction Lightening Holes Development Approach Based on Frame Durability Fatigue Performance

A123 Systems LLC-Shawn (Xianggang) Zhang
FCA US LLC-Barry (Baizhong) Lin, Ramachandra bhat, Nitin Sharma, Kevin Thomson
Published 2017-03-28 by SAE International in United States
For a light duty truck, the frame is a structural system and it must go through a series of proving ground events to meet fatigue performance requirement. Nowadays, in order to meet stringent CAFE standards, auto manufacturers are seeking to keep the vehicle weight as light as possible. The weight reduction on the frame is a challenging task as it still needs to maintain the strength, safety, and durability fatigue performance.CAE fatigue simulation is widely used in frame design before the physical proving ground tests are performed. A typical frame durability fatigue analysis includes both the base metal fatigue analysis and seam weld fatigue analysis. Usually the gauges of the frame components are dictated by the seam weld fatigue performance so opportunities for weight reduction may exist in areas away from the welds. One method to reduce frame weight is to cut lightening holes in the areas that have little impact on the frame fatigue performance. In this paper, the authors propose a new methodology to systematically identify the locations of these non-critical areas, in…
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Effect of Rainfall and Wet Road Condition on Road Crashes : A Critical Analysis

International Centre for Automotive Technology-Pinaki Mondal, Nitin Sharma, Abhishek Kumar, U. D. Bhangale, Dinesh Tyagi
National Automotive Testing and R&D Infrastructure Project-Rajesh Singh
Published 2011-01-19 by The Automotive Research Association of India in India
Road crashes deserve to be a strategic issue for any country's public health and can lead to overall growth crisis, if not addressed properly. More than 90% of deaths on the world's roads occur in low and middle-income countries (21.5 and 19.5 per lakh of population, respectively) though they have just 48% of all registered vehicles. It is estimated that road traffic deaths will increase worldwide, from 0.99 million in 1990 to 2.34 million in 2020 (representing 3.4% of all deaths). India already accounts for about 9.5% of the total 1.2 million fatal accidents in the world. In 2007, 1.14 lakh people in India lost their lives in road mishaps-that's significantly higher than the 2006 road death figures in China, 89,455. One person dies at every 4.61 minutes in India for road crashes. Road deaths in India registered a sharp 6.1% rise between 2006 and 2007. The Planning Commission of India had assessed the social cost at 55,000 crore ( 550 billion) on account of road accidents in India. Road crashes are complex interaction of…
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