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Articles 1 - 6 of 6
Full-Text Articles in Engineering
Measurement And Analysis Of Truck Transport Environment In Brazil, Giovani Otavio Rissi, Sher Paul Singh, Gary J. Burgess, Jay A. Singh
Measurement And Analysis Of Truck Transport Environment In Brazil, Giovani Otavio Rissi, Sher Paul Singh, Gary J. Burgess, Jay A. Singh
Industrial Technology and Packaging
Increasing trade in today’s global economy requires packaging to be designed to contain, protect and deliver products without damage during transportation and handling. Vibration forces that occur during transportation are one of the most significant causes of damage during shipping. The objective of this study was to quantify and analyse the vibration that occurs during truck transport in Brazil. The study was done using two types of trucks: small local trucks for local metropolitan distribution areas and larger tractor-trailers for cross-country transportation. Ten metropolitan areas in different regions of Brazil were selected for 1-day trips representing normal delivery. These trips …
Vibration Analysis Of Commercial Thermal Barrier Coatings, Lindell E. Pearson
Vibration Analysis Of Commercial Thermal Barrier Coatings, Lindell E. Pearson
Theses and Dissertations
Thermal barrier coatings (TBCs) are currently used in turbine engine components to protect substrate material from being exposed to high temperatures and corrosion. These coatings also have the potential to reduce stress in critical engine parts which could increase the life cycle of these parts. The fact that these coatings are already qualified for use in turbine engines makes it worth investigating their damping properties. The problem with TBCs is that they are difficult to characterize as they display nonlinear properties. This research utilizes an experimental and finite element procedure to characterize these coatings. A scanning electron microscope (SEM) was …
Deterioration Of Dynamic Rail Pad Characteristics, Alexander Remennikov, Sakdirat Kaewunruen, Karl Ikaunieks
Deterioration Of Dynamic Rail Pad Characteristics, Alexander Remennikov, Sakdirat Kaewunruen, Karl Ikaunieks
Alex Remennikov
Impact loads applied to concrete sleepers, either due to the wheel flats of a train or rail abnormalities, may cause the sleepers to crack. The rail pads have been used to attenuate the effect of these impact loads on concrete sleepers and on the substructures in ballasted railway tracks. The rail pads experience high intensity loads due to wheel impacts and, as a result, the pad properties deteriorate during the service life. The consequences can be significant for the dynamic behaviour of railway tracks, interaction of vehicle and track, and impact forces on track components. However, there is currently no …
Investigation Of Vibration Characteristics Of Prestressed Concrete Sleepers In Free-Free And In-Situ Conditions, Alexander Remennikov, Sakdirat Kaewunruen
Investigation Of Vibration Characteristics Of Prestressed Concrete Sleepers In Free-Free And In-Situ Conditions, Alexander Remennikov, Sakdirat Kaewunruen
Alex Remennikov
This paper presents results of an experimental modal analysis of prestressed concrete sleepers in both free-free and in-situ conditions. Four types of prestressed concrete sleepers were provided by the Australian manufacturers. The concrete sleepers were tested using an impact hammer excitation technique over the frequency range of interest: 0 to1600 Hz. Frequency response functions (FRFs) were measured using the Bruel&Kjaer PULSE dynamic analyser. The FRFs were processed using the STARModal analysis package to identify natural frequencies and the corresponding mode shapes for the sleepers. The conclusions are presented on the effect of boundary conditions on the dynamic properties of prestressed …
A Novel Dynamic Absorber Using Enhanced Magnetorheological Elastomers For Powertrain Vibration Control, Nong Zhang, Nga Hoang, Haiping Du
A Novel Dynamic Absorber Using Enhanced Magnetorheological Elastomers For Powertrain Vibration Control, Nong Zhang, Nga Hoang, Haiping Du
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a novel Adaptive Tuned Vibration Absorber (ATVA) using the enhanced magnetorheological elastomers (MREs) for powertrain vibration reduction. The MRE material used in this application includes micro-sized iron particles enhanced by adding nano-sized magnetic powders. With the enhancement, MRE's elastic modulus significantly increases due to the MR effect. In the new ATVA, the MRE plays a role as a torsional spring whose stiffness coefficient can be varied with an external magnetic field. Additionally, this ATVA could operate in shear-squeeze mode rather than shear mode. Thus, the frequency range is much wider than that of general MREs. Such property …
Improved Structural Health Monitoring Using Random Decrement Signatures, Oleg V. Shiryayev
Improved Structural Health Monitoring Using Random Decrement Signatures, Oleg V. Shiryayev
Browse all Theses and Dissertations
Detection of structural damage phenomena such as cracks, delaminations, or loose fasteners is important because it increases safety and may allow significant reduction in operational costs. Many structural health monitoring techniques are based on detecting changes in vibration features obtained from the measured response. The technique presented in this work is based on the random decrement signatures calculated from the random response. No knowledge of input signal is required. Random decrement signatures have been used for damage detection purposes in the past. The significance of this work is that it explores the possibility of identifying the type of damage and …