Your Selections

Design processes
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Committees

Events

Magazine

Series

 

Step & Repeat: Reduce Derivative Aircraft Development Risk with Design Reuse

Mentor, A Siemens Business-Muhammad Askar
  • Technical Paper
  • 2019-01-1871
To be published on 2019-09-16 by SAE International in United States
Designing derivative aircraft is a complex process with potentially large amounts of program risk. In this paper we present new technologies such as digital interface control documents, and generative design that can transform this process. Employing these types of technologies makes the process more verifiable and repeatable. The paper explains how the technologies can be adopted from the early definition of components & LRUs, to their aggregation into reusable subsystems, as well as the automation and validation processes that can be built around them to reduce the associated complexity and program risk.
 

Development Of Multi-Material Overhead Stowage Systems For Commercial Aircrafts By Using New Design and Production Methods

3D Systems GmbH-Gunnar Fick
Composite Technology Center / CTC GmbH-Marc Fette
  • Technical Paper
  • 2019-01-1858
To be published on 2019-09-16 by SAE International in United States
The relevance of innovative and functional lightweight components for aircrafts has risen significantly during the recent years. In this context, modern lightweight materials as well as cost-efficient and time-saving manufacturing technologies are required for a future aircraft production. The so called Hybrid SMC Technology and the SMC-Foam-Sandwich Technology are promising approaches for the cost-efficient and time-saving manufacturing of lightweight, geometrically complex and functional aircraft components. Both technologies have been used for the development of a new generation overhead stowage system. It is realized by sidewalls made out of enhanced SMC technologies with directly implemented metallic load introduction elements and regular sandwich structures that can be assembled by a quick-assembly principle. Due to the glass fibers in the shape of chopped long fibers with no predominant direction in SMC material, continuous carbon fiber tailored fiber placement (TFP) fabrics were integrated to increase mechanical properties. Because of several load introduction points in the demonstration part, carbon fiber loops are a good and efficient possibility to transfer these loads. The challenge in the virtual design process of SMC…
 
new

Experimental Investigations of an Icing Protection System for UAVs

Norwegian University of Science and Technology (NTNU)-Richard Hann, Kasper Borup, Artur Zolich, Håvard Vestad, Martin Steinert, Tor Johansen
UBIQ Aerospace-Kim Sorensen
Published 2019-06-10 by SAE International in United States
UAV icing is a severe challenge that has only recently shifted into the focus of research. Today, there are no mature icing mitigation technologies for UAVs, except for the largest fixed-wing drones. We are working on the development of an electro-thermal icing protection technology called D•ICE for medium-sized fixed-wing UAVs. As part of the design process, an experimental test campaign at the Cranfield icing wind tunnel has been conducted. This paper describes the icing protection system and shares experimental results on its capability for icing detection and anti-icing. Icing detection is based on an algorithm evaluating temperature signals that are induced on the leading-edge of the wing. A baseline signal is generated during dry (icing cloud off) conditions and compared to a signal during wet (icing cloud on) conditions. Due to significant differences in the heat transfer regime, the system can differentiate between these two states. The experiments show that our system can reliably predict icing conditions based on this principle. Furthermore, the anti-icing capability of the system is proven for two icing cases. The…
Datasets icon
Annotation icon
 
new

Modeling and Optimal Design of All-Wheel-Drive Hybrid Light Trucks

SAE International Journal of Alternative Powertrains

Ford Motor Company, USA-Xiaowu Zhang
Robert Bosch LLC, USA-Nikhil Ravi
  • Journal Article
  • 08-08-01-0003
Published 2019-06-06 by SAE International in United States
Fuel economy and performance are both important in the design of hybrid pickup trucks. All-wheel drive is essential to ensure superior performance compared to two-wheel-drive designs. In this article, as a comprehensive extension work to the article published in ASME Dynamic Systems and Control Conference [1] on all-wheel-drive (AWD) hybrid truck, we investigate the modeling, design, and control problem of AWD hybrid vehicles and develop a methodology to identify optimal designs. This methodology 1) formulates an automated modeling process, 2) searches exhaustively through all possible AWD designs, and 3) employs a near-optimal energy management strategy, to obtain a family of designs with superior performance and fuel economy. A design case study for a hybrid Ford F-150 is conducted, to showcase this design process.
 
new

A Non-Contact Technique for Vibration Measurement of Automotive Structures

Kettering University-Vanshaj Srivastava, Javad Baqersad
Published 2019-06-05 by SAE International in United States
The automotive and aerospace industries are increasingly using the light-weight material to improve the vehicle performance. However, using light-weight material can increase the airborne and structure-borne noise. A special attention needs to be paid in designing the structures and measuring their dynamics. Conventionally, the structure is excited using an impulse hammer or a mechanical shaker and the response is measured using uniaxial or multi-axial accelerometers to obtain the dynamics of the structure. However, using contact-based transducers can mass load the structure and provide data at a few discrete points. Hence, obtaining the true dynamics of the structure conventionally can be challenging. In the past few years, stereo-photogrammetry and three-dimensional digital image correlation have received special attention in collecting operating data for structural analysis. These non-contact optical techniques provide a wealth of distributed data over the entire structure. However, the stereo camera system is limited by its field of view of the cameras and can only measure the response on the parts of the structure that cameras have the line of sight. Therefore, a single pair…
Annotation icon
 
new

A Computational Process to Effectively Design Seals for Improved Wind Noise Performance

Dassault Systemes SIMULIA-Robert Powell, Sivapalan Senthooran, Philippe Moron
Jaguar Land Rover-Nicholas Oettle
Published 2019-06-05 by SAE International in United States
The ability to assess noise transmitted through seals to cabin interiors early in the design process is very important for automotive manufacturers. When a seal design is inadequate, the noise transmitted can dominate the interior noise, making the wind noise performance of the vehicle unacceptable. This can cause launch delays, increasing costs and risking loss of sales. Designing seals using conventional experimental processes is challenging, since the location and strength of flow noise sources are not known when the seal design is planned. Making changes to the seal system after the tooling stage is expensive for manufacturers as tooling and redesign costs can be considerable. Deliberate overdesign by adding multiple layers of seals in a wide range of locations also can reduce profit by unnecessarily raising part and manufacturing costs. Consequently, there is a strong motivation to use reliable computational capabilities to predict interior noise transmitted through seals early in the design process to address these challenges, designing seals right first time.The current study presents a computational process that can be used to predict interior…
Annotation icon
 
new

Gear System Parameters and Its Influence on Gearbox Noise

General Motors Technical Centre India-Yogesh Kumar Dewangan, Pranoy Sureshbabu Nair, Dipin Nair
Published 2019-06-05 by SAE International in United States
Tonal noise due to gears is one of the fundamental noise problems in a gearbox. Gear tooth deflections generate dynamic forces that lead to unwanted load fluctuations, thus noise. Different factors that are considered to control this noise, some to mention like proper gear macro design, microgeometry corrections, and housing compliance. However, identifying the appropriate variable as a measure of contribution to the overall response helps in getting more accurate remedial solutions. Some outputs to track are different harmonic components of TE, temperature effects, components of forces, rim compliance and friction.For evaluation, usually, the amplitudes of individual harmonics of transmission error are related to the respective orders of the noise levels assuming it as one of the primary excitation parameters of gear noise. In this paper, a brief overview of TE and its harmonic distribution is discussed with the example of an ideal gear mesh model and then quantifying TE with the introduction of mesh misalignment. The effect of providing additional microgeometry corrections to compensate for the misalignment is also discussed.The study in this paper…
Datasets icon
Annotation icon
 
new

System Interactions Affecting NVH Performance of an Electric Vehicle Drivetrain

Romax Technology, Ltd.-Melanie Michon, Robert Holehouse, Annabel Shahaj, Hisham Jafarali, Venkatakrishna Janakiraman
Published 2019-06-05 by SAE International in United States
The paper will present an integrated approach to system NVH analysis, which gives an insight into the system response in an EV driveline due to electrical and mechanical excitations; namely rotor mechanical imbalance, electrical machine torque ripple, and stator radial force shapes.The paper will address the fact that, as part of a practical design exercise, different subsystems and components may achieve design maturity at different times. It is therefore important to understand to what extent various drivetrain components may be considered in isolation, and at what point it becomes necessary to consider the interactions present in the full system.The paper will compare predicted NVH performance of a representative EV traction motor when different boundary conditions are considered; for example, when considering the motor being bested in isolation as part of a typical test setup, and when included in a representative drivetrain. For each configuration, the response to mechanical and electro-mechanical noise mechanisms will be assessed, and the fidelity of simulation required to achieve an appropriate engineering insight will be considered.From these studies, the best practice…
Datasets icon
Annotation icon
 
new

Calculation Process with Lattice Boltzmann and Finite Element Methods to Choose the Best Exterior Design for Wind Noise

Renault-Guillaume Baudet, Cecile Dutrion, Remi Lorenzi, Felix Gendre, Shanshan Geng
Published 2019-06-05 by SAE International in United States
Wind noise in automobile is becoming more and more important as the customer expectations increase. On the other hand, great progress has been made on engine and road noises, especially for electric and hybrid vehicles. Thus, the wind noise is now by far the major acoustic source during road and motorway driving.As for other noises, automobile manufacturers must be able, for a new car project, to specify, calculate and measure each step of the acoustic cascading:SourceTransfers, both solid and air borneIn the case of the automotive wind noise, the excitation source is the dynamic pressure on the vehicle’s panels. This part of the cascading is the one influenced by the exterior design. Even if many others components (panels, seals, cabin trims) have a big influence, the exterior design is a major issue for the wind noise. The wind noise level in the cabin may change significantly with only a small modification of the exterior design.This paper addresses the problem of doing the good choice of exterior design in the early phases of a new vehicle’…
Datasets icon
Annotation icon
 
new

Preliminary Study of Perceived Vibration Quality for Human Hands

Bruel & Kjaer North America, Inc.-Edward Green, Sophie Kaye
Kettering University-Jennifer M. Bastiaan
Published 2019-06-05 by SAE International in United States
A large body of knowledge exists regarding the effects of vibration on human beings; however, the emphasis is generally on the damaging effects of vibration. Very little information has been published regarding the effect of vibration on perceived consumer product quality. The perceived loudness of a product is quantified using the Fletcher-Munson equal loudness curves, but the equivalent curves for perceived vibration amplitude as a function of amplitude and frequency are not readily available. This “vibration quality” information would be valuable in the design and evaluation of many consumer products, including automobiles. Vibration information is used in the automobile design process where targets for steering wheel, seat track, and pedal vibration are common. For this purpose, the vibration information is considered proprietary and is generally applicable to a narrow frequency range. In this investigation, work paralleling the original Fletcher-Munson study is presented. “Equal comfort curves” for vibration were measured and developed for hands grasping a handlebar. A paired-comparison test methodology was used to establish an equivalency of perceived vibration comfort for vibration in a wide…
Datasets icon
Annotation icon