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Articles 2191 - 2220 of 2936
Full-Text Articles in Social and Behavioral Sciences
Experimental Investigation Of A Hydraulically Interconnected Suspension In Vehicle Dynamics And Stability Control, Lifu Wang, Nong Zhang, Haiping Du
Experimental Investigation Of A Hydraulically Interconnected Suspension In Vehicle Dynamics And Stability Control, Lifu Wang, Nong Zhang, Haiping Du
Faculty of Engineering and Information Sciences - Papers: Part A
Mainly motivated by developing cost-effective vehicle anti-roll systems, hydraulically interconnected suspension has been studied in the past decade to replace anti-roll bars. It has been proved theoretically and practically that hydraulic suspensions have superior anti-roll ability over anti-roll bars, and therefore they have achieved commercial success in racing cars and luxury sports utility vehicles (SUVs). However, since vehicle is a highly coupled complex system, it is necessary to investigate/evaluate the hydraulic-suspension-fitted-vehicle's dynamic performance in other aspects, apart from anti-roll ability, such as ride comfort, lateral stability, etc. This paper presents an experimental investigation of a SUV fitted with a hydraulically …
Virtual Worlds And Health: Healthcare Delivery And Simulation Opportunities, David Holloway
Virtual Worlds And Health: Healthcare Delivery And Simulation Opportunities, David Holloway
Faculty of Engineering and Information Sciences - Papers: Part A
With decades of experience in simulation, the health professions are comparatively well versed in virtual environments for training. More broadly, there is a growing body of experience and supporting evidence on the benefits of virtual worlds for professional information sharing, clinical simulation, healthcare delivery, and as a research tool. Virtual worlds have empirically demonstrated outcomes as a simulation tool that increases knowledge and of health professionals, and initial explorations in regard to healthcare delivery show promise. Key challenges for wider adoption of virtual worlds within the health professions include a lack of established standards around privacy, a fragmented approach to …
Key-Based Scrambling For Secure Image Communication, Prashan Premaratne, Malin Premaratne
Key-Based Scrambling For Secure Image Communication, Prashan Premaratne, Malin Premaratne
Faculty of Engineering and Information Sciences - Papers: Part A
Secure image communication is becoming increasingly important due to theft and manipulation of its content. Law enforcement agents may find it increasingly difficult to stay afloat above the ill intentions of hackers. We have been able to develop an image scrambling algorithm that is very simple to implement but almost impossible to breach with a probability less than 5x10− 300. This is possible due to the fact that a user may purchase or acquire rights for an intended image by specifying a 'key' that can form a sequence of numbers 10 to 100 in length. The content provider uses this …
X-Tream: A Novel Dosimetry System For Synchrotron Microbeam Radiation Therapy, M Petasecca, A Cullen, I Fuduli, A Espinoza, C Porumb, C Stanton, A H. Aldosari, E Brauer-Krisch, H Requardt, A Bravin, V Perevertaylo, Anatoly B. Rosenfeld, M L. F Lerch
X-Tream: A Novel Dosimetry System For Synchrotron Microbeam Radiation Therapy, M Petasecca, A Cullen, I Fuduli, A Espinoza, C Porumb, C Stanton, A H. Aldosari, E Brauer-Krisch, H Requardt, A Bravin, V Perevertaylo, Anatoly B. Rosenfeld, M L. F Lerch
Faculty of Engineering and Information Sciences - Papers: Part A
Microbeam Radiation Therapy (MRT) is a radiation treatment technique under development for inoperable brain tumors. MRT is based on the use of a synchrotron generated X-ray beam with an extremely high dose rate ( ~ 20 kGy/sec), striated into an array of X-ray micro-blades. In order to advance to clinical trials, a real-time dosimeter with excellent spatial resolution must be developed for absolute dosimetry. The design of a real-time dosimeter for such a radiation scenario represents a significant challenge due to the high photon flux and vertically striated radiation field, leading to very steep lateral dose gradients. This article analyses …
The Dynamics Of A Rising Pivoted Cylinder, B Stappenbelt, J Neville, B Murdoch, A Johnstone
The Dynamics Of A Rising Pivoted Cylinder, B Stappenbelt, J Neville, B Murdoch, A Johnstone
Faculty of Engineering and Information Sciences - Papers: Part A
The existence of a critical mass ratio for cylinders undergoing vortex-induced vibration (VIV) in a translational system has been well established. Below this critical point, the reduced velocity at VIV lock-out tends to infinity. It has been surmised that a corresponding mass moment of inertia ratio must exist for a pivoted cylinder arrangement. To the authors' knowledge there has been no investigation published substantiating this premise. The aim of the present investigation then was to examine the critical point for cylinders in a rotational system. The approach adopted involved measuring the VIV amplitude response of a positively buoyant, and hence …
Ethics In Engineering: Student Perceptions And Their Professional Identity Development, Brad Stappenbelt
Ethics In Engineering: Student Perceptions And Their Professional Identity Development, Brad Stappenbelt
Faculty of Engineering and Information Sciences - Papers: Part A
Professional ethics instruction in engineering is commonly conducted by examining case studies in light of the code of conduct of a suitable professional body. Although graphical presentations of spectacular failures, sobering stories of the repercussions and the solid framework provided by the tenets of a code of ethics may leave a lasting impression, students generally gain their professional identity from relatives and colleagues. Their professional ethics tend to be mostly an extension of their personal ethics. Instruction on ethics generally serves only to reinforce students' inclination to act ethically and provides encouragement to act on these beliefs. In this study …
Wireless Indoor Localisation Using Received Signal Strength Fingerprinting With Context Aware Partitioning, Montserrat Ros, Brendan Schoots, Matthew D'Souza
Wireless Indoor Localisation Using Received Signal Strength Fingerprinting With Context Aware Partitioning, Montserrat Ros, Brendan Schoots, Matthew D'Souza
Faculty of Engineering and Information Sciences - Papers: Part A
Real-time indoor localisation tracking of people with unobtrusive, wearable sensors has valuable potential for a variety of applications such as remote monitoring and tracking of aged-care patients to improve their safety and other care aspects. There are no widely available or costeffective and ubiquitous wireless solutions like GPS for indoor localisation which require no prior infrastructure. Indoor localisation systems are available but most have difficulties operating in confined spaces or cannot localise to within small distances in real-time for moving objects as required for sport and health applications.
A Framework For Inter-Organizational Knowledge Sharing: Managerial Influences, Rosemary A. Van Der Meer, Luba Torlina
A Framework For Inter-Organizational Knowledge Sharing: Managerial Influences, Rosemary A. Van Der Meer, Luba Torlina
Faculty of Engineering and Information Sciences - Papers: Part A
The purpose of this paper is to determine whether an existing organizational knowledge management framework could be utilized in an inter-organizational domain. We selected the threefold KM framework developed by Holsapple and Joshi (2000; 2002). This framework has been well tested and provides clearly defined elements to examine the influences on knowledge management and knowledge sharing in an organizational context. We report the results of testing the framework in three inter-organizational case studies and propose some adaptations to the managerial influences for inter-organizational analysis.
Robust Designs For Poisson Regression Models, J M. Mcgree, J A. Eccleston
Robust Designs For Poisson Regression Models, J M. Mcgree, J A. Eccleston
Faculty of Engineering and Information Sciences - Papers: Part A
We consider the problem of how to construct robust designs for Poisson regression models. An analytical expression is derived for robust designs for first-order Poisson regression models where uncertainty exists in the prior parameter estimates. Given cer- tain constraints in the methodology, it may be necessary to extend the robust designs for implementation in practical experiments. With these extensions, our methodology con- structs designs which perform similarly, in terms of estimation, to current techniques, and offers the solution in a more timely manner. We further apply this analytic result to cases where uncertainty exists in the linear predictor. The application …
Parameter Estimation Of A Regime-Switching Model Using An Inverse Stieltjes Moment Approach, X Xi, Marianito R. Rodrigo, Rogemar S. Mamon
Parameter Estimation Of A Regime-Switching Model Using An Inverse Stieltjes Moment Approach, X Xi, Marianito R. Rodrigo, Rogemar S. Mamon
Faculty of Engineering and Information Sciences - Papers: Part A
We address the problem of recovering the time-dependent parameters of the Black-Scholes option pricing model when the underlying stock price dynamics are modelled by a finite-state, continuous-time Markov chain. The coupled system of Dupire-type partial differential equations is derived and formulated as an inverse Stieltjes moment problem. We provide numerical illustration on how to apply our method to simulated financial data. The accuracy of the model parameter estimation is examined and sensitivity analyses are included to study the behaviour of the estimated results when model parameters are varied.
Finite Element Analysis Of Consolidation Behavior Of Composite Soft Ground, S Horpibulsuk, A Chinkulkijniwat, A Cholaphatsron, J Suebsuk, M D. Liu
Finite Element Analysis Of Consolidation Behavior Of Composite Soft Ground, S Horpibulsuk, A Chinkulkijniwat, A Cholaphatsron, J Suebsuk, M D. Liu
Faculty of Engineering and Information Sciences - Papers: Part A
Columnar inclusion is one of the effective and widely used methods for improving engineering properties of soft clay ground. This paper investigates the consolidation behavior of composite soft clay ground using both physical model tests under an axial-symmetry condition and finite element simulations using the PLAXIS 2D program. Because the soil-cement column enhances the yield stress and stiffness of the composite ground, the composite ground is in an over-consolidated state under the applied vertical applied stresses. At this state, the rate of consolidation is rapid due to a high coefficient of consolidation. The consolidation of the composite ground is mainly …
Comparison Of 16 Mm Osu-Nag And Coms Eye Plaques, Hualin Zhang, Frederick Davidorf, Yujin Qi
Comparison Of 16 Mm Osu-Nag And Coms Eye Plaques, Hualin Zhang, Frederick Davidorf, Yujin Qi
Faculty of Engineering and Information Sciences - Papers: Part A
OSU-NAG eye plaques use fewer sources than COMS-plaques of comparable size, and do not employ a Silastic seed carrier insert. Monte Carlo modeling was used to calculate 3D dose distributions for a 16 mm OSU-NAG eye plaque and a 16 mm COMS eye plaque loaded with either Iodine-125 or Cesium-131 brachytherapy sources. The OSU-NAG eye plaque was loaded with eight sources forming two squares, whereas the COMS eye plaque was loaded with thirteen sources approximating three isocentric circles. A spherical eyeball 24.6 mm in diameter and an ellipsoid-like tumor 6 mm in height and 12 mm in the major and …
Experimental Study On Chain-Die Forming For Ultrahigh Strength Steel (Uhss), Yuankun Zhang, Shichao Ding
Experimental Study On Chain-Die Forming For Ultrahigh Strength Steel (Uhss), Yuankun Zhang, Shichao Ding
Faculty of Engineering and Information Sciences - Papers: Part A
With the increasing applications of UHSS for the automotive industry, it becomes more and more important to develop a new forming technology as an alternative or even a replacement to roll forming to overcome the difficulties and problems of manufacturing the UHSS. With the increase of material's strength and decrease of its thickness, the springback of the material becomes more difficult to predict, which directly affects the application of roll forming in UHSS. Chain-die Forming, as an alternative to roll forming proposed and developed recently in Australia, is expected to be a solution to the problems addressed. It has been …
Estimation Of Regression Parameters From Noise Multiplied Data, Yan-Xia Lin, Phillip Wise
Estimation Of Regression Parameters From Noise Multiplied Data, Yan-Xia Lin, Phillip Wise
Faculty of Engineering and Information Sciences - Papers: Part A
This paper considers the scenario that all data entries in a confidentialised unit record file were masked by multiplicative noises, regardless of whether unit records are sensitive or not and regardless of whether the masked variables are dependent or independent variables in the underlying regression analysis. A technique is introduced in this paper to show how to estimate parameters in a regression model, which is originally fitted by unmasked data, based on masked data. Several simulation studies and a real-life data application are presented.
Drying Shrinkage Of Concrete Made From Recycled Concrete Aggregate, B A. Whiting, T J. Mccarthy, E Lume
Drying Shrinkage Of Concrete Made From Recycled Concrete Aggregate, B A. Whiting, T J. Mccarthy, E Lume
Faculty of Engineering and Information Sciences - Papers: Part A
Recycled concrete aggregates (RCA) are used in new concrete mixes, termed recycled aggregate concrete (RAC). Among losses in most fresh and hardened properties, literature reports that RAC suffers increased levels of drying shrinkage compared to equivalent mixes incorporating conventional aggregates. This paper describes the procedure and results of a range of experiments conducted on a commercial RCA and its use in new concrete mixes. In particular, this work quantifies the effect 100% RCA has on the drying shrinkage of the resulting concrete. A commercially available RCA was characterised by analysing the particle shape and texture, percentage of solid contaminants, particle …
Effect Of Manganese Content And Microstructure On The Susceptibility Of X70 Pipeline Steel To Hydrogen Cracking, D Hejazi, A J. Haq, N Yazdipour, D P. Dunne, A Calka, Frank J. Barbaro, E V. Pereloma
Effect Of Manganese Content And Microstructure On The Susceptibility Of X70 Pipeline Steel To Hydrogen Cracking, D Hejazi, A J. Haq, N Yazdipour, D P. Dunne, A Calka, Frank J. Barbaro, E V. Pereloma
Faculty of Engineering and Information Sciences - Papers: Part A
The influence of composition and microstructure on susceptibility to hydrogen induced cracking (HIC) was investigated in high strength pipeline steels, with Mn contents of 1.2% (standard, X70), and 0.5% (medium, MX70). The HIC resistance of the simulated coarse grained heat affected zone microstructures and normalized X70 transfer bar was also investigated. Notched and fatigue pre-cracked samples were charged with hydrogen prior to three point bend tests. The conditional fracture toughness JQ was determined. The results are discussed in relation to grain size, microstructure, composition and the type and distribution of non-metallic inclusions and precipitates.
Does The Critical Shields Stress For Sediment Transport Depend On Channel-Bed Slope?, Ishraq Alfadhli, Shu-Qing Yang, Muttucumaru Sivakumar
Does The Critical Shields Stress For Sediment Transport Depend On Channel-Bed Slope?, Ishraq Alfadhli, Shu-Qing Yang, Muttucumaru Sivakumar
Faculty of Engineering and Information Sciences - Papers: Part A
This paper investigates why the observed critical Shields stress for incipient sediment motion deviates from the Shields curve. This deviation is often described in the literature as due to measurement errors and non-uniformity of channel-bed slope or flows. On the contrary, this paper hypothesises the deviation as due to the presence of vertical velocity in open channel flows. We found that the existence of vertical velocity in non-uniform flows can lead to the deviation of critical shear stress from the standard Shield's diagram that is valid only in uniform flows, and the channel bed slope could not contribute to the …
Quantitative Assessment Of Landslide Frequency Versus Magnitude Of Displacement, P N. Flentje, R N. Chowdhury, Anthony Miner, C Mazengarb
Quantitative Assessment Of Landslide Frequency Versus Magnitude Of Displacement, P N. Flentje, R N. Chowdhury, Anthony Miner, C Mazengarb
Faculty of Engineering and Information Sciences - Papers: Part A
Understanding landslide frequency is an important challenge in the process of the assessment of landslide risk. Importantly, from the perspective of landslide risk management today, this paper investigates the relationship between 'how often will a landslide move' and 'how far will it move when it does move'. Such relationships must reflect the continuum between the lower frequency 'catastrophic' type failures and the much higher frequency millimeter type magnitudes of displacement; and intervals along this continuum will likely have different management significance. So, when considering the frequency of landslide move-ment, the full question must be 'what is the frequency of a …
Manifold Drived Mr-Less Pib Suvr Normalisation, P Bourgeat, P Raniga, V Dore, L Zhou, S L. Macaulay, R Martins, C L. Masters, D Ames, K Ellis, V L. Villemagne, C C. Rowe, O Salvado, J Fripp
Manifold Drived Mr-Less Pib Suvr Normalisation, P Bourgeat, P Raniga, V Dore, L Zhou, S L. Macaulay, R Martins, C L. Masters, D Ames, K Ellis, V L. Villemagne, C C. Rowe, O Salvado, J Fripp
Faculty of Engineering and Information Sciences - Papers: Part A
Pittsburgh Compound B (PiB) is a C11 PET tracer designed to bind to amyloid plaques, one of the hallmark of Alzheimer's disease. The potential of PiB as an early marker of Alzheimer's disease has lead to an increasing use of PiB and the development of several F18 equivalents. Quantitative analysis of PiB images requires an accurate normalisation, parcellation and estimation of retention in the brain's gray matter. Typically this relies on co-registered MRI to extract the cerebellum, compute the standardized uptake value ratio (SUVR) and provide parcellation and segmentation for quantification of neocortical SUVR. However, not all subjects undergo MRI. …
Performance Analysis Of Distribution Networks Under High Penetration Of Solar Pv, M J. E Alam, Kashem M. Muttaqi, Darmawan Sutanto, L Elder, A Baitch
Performance Analysis Of Distribution Networks Under High Penetration Of Solar Pv, M J. E Alam, Kashem M. Muttaqi, Darmawan Sutanto, L Elder, A Baitch
Faculty of Engineering and Information Sciences - Papers: Part A
Integration of solar photovoltaic (PV) resources into distribution networks changes the normally expected network behaviour by injecting real power into the point of connection. Depending on the characteristics and setup of the PV inverter, reactive power could also be injected into the network. The impact will depend on the control strategy adopted for reactive power injection. Typically, solar PV units are installed at low voltage (LV) level in distribution networks. Cluster based installation of numerous PV inverters in the LV level will impact the operation of both the host LV network and the upstream medium voltage network. With random variations …
Editorial Introduction, Raymond Chambers
Editorial Introduction, Raymond Chambers
Faculty of Engineering and Information Sciences - Papers: Part A
This issue of Survey Research Methods contains four papers that were presented at the ITACOSM11 conference held in Pisa, Italy, June 27-29, 2011. ITACOSM is an Italian scientific conference on the development, testing, and application of survey sampling methodologies in the fields of economics, social and demographic sciences and ocial statistics and in studies of biological and environmental phenomena. It is organized by the Permanent Working Group on Sample Survey Methodology of the Italian Statistical Society.
A New Formulation For The Geometric Layout Optimisation Of Flat Slab Floor Systems, Muhammad N. Hadi, Pezhman Sharafi, Lip H. Teh
A New Formulation For The Geometric Layout Optimisation Of Flat Slab Floor Systems, Muhammad N. Hadi, Pezhman Sharafi, Lip H. Teh
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a heuristic approach for the optimum layout design of multi-span flat slab floors in order to optimise the total cost. For this purpose, a heuristic methodology is developed in order to achieve a new objective function for the structural optimisation problem. The proposed objective function has the capability to make use of action effects of the structure as the alternative design variables in place of the commonly used cross-sectional ones. Such a feature provides the method with the ability to be easily employed in large and realistic structural optimisation problems. Furthermore, the proposed formulation, in an iterative …
Risk-Adaptive Volumetric Modulated Arc Therapy Using Biological Objective Functions For Subvolume Boosting In Radiotherapy, Nicholas G. Hardcastle, Wolfgang Tome
Risk-Adaptive Volumetric Modulated Arc Therapy Using Biological Objective Functions For Subvolume Boosting In Radiotherapy, Nicholas G. Hardcastle, Wolfgang Tome
Faculty of Engineering and Information Sciences - Papers: Part A
Simultaneous integrated boost (SIB) for prostate cancer allows increases in tumor control probability while respecting normal tissue dose constraints. Biological optimization functions that optimize based on treatment outcome can be used to create SIB prostate plans. This study investigates the feasibility of biologically optimized volumetric modulated arc therapy (VMAT) for SIB prostate radiotherapy. Methods. Five prostate cancer patients with diffusion-weighted MR images were selected for analysis. A two-step VMAT optimization was performed, which consisted of an initial biological optimization of a static gantry angle delivery followed by conversion of the static delivery to a single arc VMAT plan. A dosimetric …
Self-Shape Optimisation Of Cold-Formed Steel Columns, Timothee Savoyat, Benoit Gilbert, Lip H. Teh
Self-Shape Optimisation Of Cold-Formed Steel Columns, Timothee Savoyat, Benoit Gilbert, Lip H. Teh
Faculty of Engineering and Information Sciences - Papers: Part A
One of the main advantages of cold-formed steel profiles is the great flexibility of cross-sectional shapes, attributable to the manufacturing process allowing achievement of almost any desired cross-section. The cross-sectional shape is the key element in enhancing the strength of coldformed steel profiles as it controls the three fundamental buckling modes: local, distortional (for open profiles) and global. However, research on optimisation of cold-formed steel profiles has been mainly restricted to the conventional C, Z or Σ cross-sectional shapes and seldom new crosssectional shapes have been considered. This report presents the optimisation of cold-formed open columns using the recently developed …
Lateral Vibration Of Caisson-Pile Composite Foundation In Layered Soils, Maosong Huang, Rui Zhong, Qing Ren
Lateral Vibration Of Caisson-Pile Composite Foundation In Layered Soils, Maosong Huang, Rui Zhong, Qing Ren
Faculty of Engineering and Information Sciences - Papers: Part A
The improvement of vibration characteristics of caisson foundation due to the piles added at the bottom is studied. Firstly, dynamic equilibriums for lateral vibration of caisson-pile composite foundation are created through the displacement coordination and internal force equilibrium s at the interface between the two parts of the caisson and piles. Vibration equilibriums for the part of caisson are created by external force balance with the utilization of dynamic Winkler model, and vibration characteristics of the part of piles are defined by the existing literatures. Secondly, the coefficients of dynamic Winkler model in vibration of caisson are studied, and improved …
Improved Hydrogen Storage Properties Of Mgh2 Doped With Chlorides Of Transition Metals Hf And Fe, M Ismail Ismail, Yue Zhao, Xuebin Yu, S X. Dou
Improved Hydrogen Storage Properties Of Mgh2 Doped With Chlorides Of Transition Metals Hf And Fe, M Ismail Ismail, Yue Zhao, Xuebin Yu, S X. Dou
Faculty of Engineering and Information Sciences - Papers: Part A
The effects of HfCl4 and FeCl3 addition on the de/rehydrogenation properties of MgH2 were investigated. Both HfCl4 and FeCl3-doped MgH2 samples started to released hydrogen at about 270 °C, a decreased of about 70 °C and about 140 °C compared to as-milled and as-received MgH2, respectively. In terms of the desorption kinetics, the HfCl4-doped MgH2 sample showed significant improvement, with 6.0 wt.% hydrogen released within 10 min at 300 °C, while the FeCl3-doped MgH2 and undoped MgH2 samples released 3.5 and 0.2 wt.% hydrogen, respectively, under the same conditions. In terms of the absorption kinetics, 5.5 wt.% hydrogen was charged …
Reconfigurable Photonic Crystal Waveguides Created By Selectrive Liquid Infiltration, A Casas Bedoya, P Domachuk, C Grillet, C Monat, E Magi, Enbang Li, Benjamin J. Eggleton
Reconfigurable Photonic Crystal Waveguides Created By Selectrive Liquid Infiltration, A Casas Bedoya, P Domachuk, C Grillet, C Monat, E Magi, Enbang Li, Benjamin J. Eggleton
Faculty of Engineering and Information Sciences - Papers: Part A
We experimentally demonstrate reconfigurable photonic crystal waveguides created directly by infiltrating high refractive index (n≈2.01) liquids into selected air holes of a two-dimensional hexagonal periodic lattice in silicon. The resulting effective index contrast is large enough that a single row of infiltrated holes enables light propagation at near-infrared wavelengths. We include a detailed comparison between modeling and experimental results of single line defect waveguides and show how our infiltration procedure is reversible and repeatable. We achieve infiltration accuracy down to the single air hole level and demonstrate control on the volume of liquid infused into the holes by simply changing …
Feasibility Of Passivhaus Standards And Alternative Passive Design On Climatic Zones Of Chile - Determination Of Energy Requirements With Dynamic Simulation, Javier Carrasco Eade, Georgios Kokogiannakis
Feasibility Of Passivhaus Standards And Alternative Passive Design On Climatic Zones Of Chile - Determination Of Energy Requirements With Dynamic Simulation, Javier Carrasco Eade, Georgios Kokogiannakis
Faculty of Engineering and Information Sciences - Papers: Part A
The current building envelope standards from Article 4.1.10 of the “General Law of Urban Planning and Construction” The current building envelope standards from Article 4.1.10 of the “General Law of Urban Planning and Construction” in Chile are applied on a typical residential building for the climate of Concepción (36° Latitude South, 73° Longitude West) and a detailed energy simulation program is used to assess the energy performance of this building. The simulation results of the Chilean standards are then compared with simulation results of PassivHaus standards upon the same building layout and with simulation results from the same typical building …
Robust Sampled-Data Control Of Structures Subject To Parameter Uncertainties And Actuator Saturation, Haiping Du, Nong Zhang, Bijan Samali, Fazel Naghdy
Robust Sampled-Data Control Of Structures Subject To Parameter Uncertainties And Actuator Saturation, Haiping Du, Nong Zhang, Bijan Samali, Fazel Naghdy
Faculty of Engineering and Information Sciences - Papers: Part A
"This paper presents a robust sampled-data controller design approach for vibration attenuation of civil structures considering parameter uncertainties and actuator saturation. The parameter uncertainties belong to polytopic form and are assumed to be the variations of the structural stiffness and damping. Regarding the uncertain sampling problem encountered in real world applications, the sampling period designed for the controller is allowed to be variable within a given bound. In order to obtain reduced peak response quantities, the energy-to-peak performance used to describe the peak values of the control output under all possible energy-bounded disturbances is optimised. The robust sampled-data state feedback …
Rheology Of Magnetorheological Shear Thickening Fluid, Weihua Li, Masami Nakano
Rheology Of Magnetorheological Shear Thickening Fluid, Weihua Li, Masami Nakano
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents the fabl'ication and study of rheology of A new mognctorheo1.ogical shcar thickening fluid (MR TF). Nlin size silica particles were suspcndcd in a solvent elhylene glycol, at high concentration which form hcar thickenjng fluids. Then the micron-size carbonyl iron particles .with different volume fractions were added into the TF to fabricaled MR TF. Their dynCllilie properties in different shear strain rate and magnetic field were tested by using a rheometer. The 1I. pension show an abnlpt Increase in complex viscosity beyond a critical dynamic shear rate and a magnetic field controllable charactcristic, as wel.l as rever ibl …