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Articles 1 - 13 of 13

Full-Text Articles in Automotive Engineering

Fully Pneumatic Semi-Active Vibration Isolator Design And Analysis, Hans William Schaeffer Jan 2017

Fully Pneumatic Semi-Active Vibration Isolator Design And Analysis, Hans William Schaeffer

Graduate Theses and Dissertations

The research presented in this thesis provides a methodology of designing, modeling and controlling a fully pneumatic semi-active vibration isolator system. The prototype vibration isolator system has the ability to adjust the damping and natural frequency characteristics of the system. It consists of an air spring, a variable orifice valve, and an accumulator. In this conguration, the spring characteristics are provided by the air spring and accumulator, while the variable orifice valve provides the damping characteristics. The valve is computer regulated according to the innovative control laws that were developed for the pneumatic system. The

vibration isolator system is designed ...


Non-Destructive Testing Of 3d-Hybrid Components Using Air-Coupled Ultrasound, Wolfgang Adebahr, Marc Kreutzbruck Jan 2016

Non-Destructive Testing Of 3d-Hybrid Components Using Air-Coupled Ultrasound, Wolfgang Adebahr, Marc Kreutzbruck

Review of Progress in Quantitative Nondestructive Evaluation

The increasing use of hybrid lightweight structures in the automotive industry brings new challenges in the area of multi-material boundaries. Insufficient bonding quality between two kinds of materials, especially in highly loaded structures, affects the component’s performance. Hence, it is very important to monitor the bonding quality in multi-material structures. Flat specimen, consisting of sheet steel and organic sheet layers were examined using air- coupled ultrasound transducers in reflection setup. By slanted incidence of the ultrasound on the profile’s surface, guided waves were excited in the specimen and delaminated areas could be visualized due to changed phase values ...


Automated X-Ray Quality Control Of Catalytic Converters, N. Shashishekhar, Veselitza Jan 2016

Automated X-Ray Quality Control Of Catalytic Converters, N. Shashishekhar, Veselitza

Review of Progress in Quantitative Nondestructive Evaluation

Catalytic converters are devices attached to the exhaust system of automobile or other engines to eliminate or substantially reduce polluting emissions. They consist of coated substrates enclosed in a stainless steel housing. The substrate is typically made of ceramic honeycombs; however stainless steel foil honeycombs are also used. The coating is usually a slurry of alumina, silica, rare earth oxides and platinum group metals. The slurry also known as the wash coat is applied to the substrate in two doses, one on each end of the substrate; in some cases multiple layers of coating are applied. X-ray imaging is used ...


Acoustic Emission Detection Of Early Stages Of Cracks In Rotating Gearbox Components, Dan Xiang Jan 2016

Acoustic Emission Detection Of Early Stages Of Cracks In Rotating Gearbox Components, Dan Xiang

Review of Progress in Quantitative Nondestructive Evaluation

Many critical, highly loaded rotating gearbox components have fast crack propagation rates. Early detection of cracks in gearbox is critical to mitigating the risk of catastrophic failure. Acoustic Emission (AE) techniques have proven to be capable of continuously monitoring the crack initiation and propagation [1-3]. Due to the long distance of AE signal propagation from the AE sources to the sensors installed in the housing, the AE signal suffers from severe attenuation and noises. Accurate AE signal classification technology that is capable of extracting the true AE signal out of background noises generated by the surrounding environment of a gearbox ...


Quantifying Road Roughness: Multiresolution And Near Real-Time Analysis, Ahmad Abdulraheem Alhasan Jan 2015

Quantifying Road Roughness: Multiresolution And Near Real-Time Analysis, Ahmad Abdulraheem Alhasan

Graduate Theses and Dissertations

Road roughness is a key parameter for road construction and for assessing ride quality during the life of paved and unpaved road systems. The quarter-car model (QC model), is a standard mathematical tool for estimating suspension responses and can be used for summative or pointwise analysis of vehicle response to road geometry.

In fact, transportation agencies specify roughness requirements as summative values for pavement projects that affect construction practices and contractor pay factors. The International Roughness Index (IRI), a summative statistic of quarter-car suspension response, is widely used to characterize overall roughness profiles of pavement stretches but does not provide ...


Examination Of The Effects Of External Load, Velocity, And Center Of Gravity On Weight Estimation Using A Lifting Linkage, Ryan Mccleish Jan 2015

Examination Of The Effects Of External Load, Velocity, And Center Of Gravity On Weight Estimation Using A Lifting Linkage, Ryan Mccleish

Graduate Theses and Dissertations

Having an accurate measurement of the weight of a vehicle payload is important, when moving material. An accurate knowledge of the payload can increase efficiency during material transportation, by ensuring the maximum payload is being moved. Many existing weight measurement systems exist but are often costly, add significant weight, or increase operating time. An improved dynamic weight measurement system to estimate the weight of a payload inside of a container is proposed in this research. Using pressure transducers and angle sensors on a lifting linkage, the weight of a payload is calculated in constant motion, which minimizes any time loss ...


Towards Proper-Inconsistency In Weldability Prediction Using K-Nearest Neighbor Regression And Generalized Regression Neural Network With Mean Acceptable Error, Junheung Park, Kyoung-Yun Kim, Raj Sohmshetty Jan 2014

Towards Proper-Inconsistency In Weldability Prediction Using K-Nearest Neighbor Regression And Generalized Regression Neural Network With Mean Acceptable Error, Junheung Park, Kyoung-Yun Kim, Raj Sohmshetty

Center for e-Design Proceedings

A significant inconsistency problem exists in the quality of resistance spot welding, and yet it offers various advantages in production. These inconsistent welding data can be eliminated using anomaly detection or instance selection methods. However, in the weldability prediction problem, this inconsistency we refer to as proper-inconsistency, may not be eliminated since it can be used to extract additional information. In this research, we examine the effects of this inconsistency on prediction performance using two machine learning methods, k-Nearest Neighbors (kNN) regression and Generalized Regression Neural Network, in order to identify an approach towards tackling the proper-inconsistency problem in weldability ...


Modeling A Severe Supply Chain Disruption And Post-Disaster Decision Making With Application To The Japanese Earthquake And Tsunami, Cameron A. Mackenzie, Kash Barker, Joost R. Santos Jan 2014

Modeling A Severe Supply Chain Disruption And Post-Disaster Decision Making With Application To The Japanese Earthquake And Tsunami, Cameron A. Mackenzie, Kash Barker, Joost R. Santos

Cameron A. MacKenzie

Modern supply chains are increasingly vulnerable to disruptions, and a disruption in one part of the world can cause supply difficulties for companies around the globe. This article develops a model of severe supply chain disruptions in which several suppliers suffer from disabled production facilities and firms that purchase goods from those suppliers may consequently suffer a supply shortage. Suppliers and firms can choose disruption management strategies to maintain operations. A supplier with a disabled facility may choose to move production to an alternate facility, and a firm encountering a supply shortage may be able to use inventory or buy ...


Distributed Controller Synthesis And Decision Making, Vikas Yadav Jan 2007

Distributed Controller Synthesis And Decision Making, Vikas Yadav

Retrospective Theses and Dissertations

Distributed controller design and distributed decision making have been hot topics of investigation in the last few years. New technologies have led to systems where it is critical to identify architectures that distribute the controller effort over sub-controllers to respect the information flow and/or resource constraints. The communication uncertainty between sub-controllers partly governs the optimality of the architecture of the controller. The related synthesis methodology for optimal distributed controller has to address internal stability concerns and has to incorporate the effect of communication uncertainty into the performance metric. In the first part of this thesis, a methodology is developed ...


Magnesium-Based Metal-Metal Composites, J. A. Jensen, Alan M. Russell, T. W. Ellis, L. Scott Chumbley Jan 1995

Magnesium-Based Metal-Metal Composites, J. A. Jensen, Alan M. Russell, T. W. Ellis, L. Scott Chumbley

Materials Science and Engineering Publications

Metal-metal fiber-reinforced composites with high ductility and high strength have previously been produced by deformation processing Cu and Ti binary alloys. Mg-X alloys (where X =Ti, Nb, and Fe) have also been deformation processed to produce high-strength, high-ductility composites which have stable microstructures when exposed to 400°C for 500 hours. In these experiments, metal-metal composites consisting of a matrix of Mg or Mg-12wt%Li-2wt%Nd were produced by infiltrating a 10-20% dense steel wool with the molten matrix alloy. The Mg/IOSW material did not roll well, even at 300°C. However, the Mg-12Li-2Nd/20SW had excellent ductility at ...


Dynamic Behavior Of Seatbelts In Rollover Situation, Ming-Te Cheng Jan 1989

Dynamic Behavior Of Seatbelts In Rollover Situation, Ming-Te Cheng

Retrospective Theses and Dissertations

No abstract provided.


Simulation Of Automatic Control For Tractor Guidance, Jianlin Ge Jan 1987

Simulation Of Automatic Control For Tractor Guidance, Jianlin Ge

Retrospective Theses and Dissertations

No abstract provided.


Ride And Handling Models Of A Vehicle With Active Suspensions, Jay E. Shannan Jan 1986

Ride And Handling Models Of A Vehicle With Active Suspensions, Jay E. Shannan

Retrospective Theses and Dissertations

No abstract provided.