ORCID Profile
0000-0001-9416-3908
Current Organisation
James Cook University
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Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 09-2021
Publisher: Technical University of Varna
Date: 31-12-2020
DOI: 10.29114/AJTUV.VOL4.ISS2.180
Abstract: High density polyethylene (HDPE) is a thermoplastic polymer which is classified as one of the highly consumed types of plastics. One major advantage of thermoplastic materials is their ability of recycling and reprocessing which will bring considerable economicand environmental benefits. The present paper, therefore, endeavours to explore the practical possibility of using recycled HDPE hollow section as a replacement of virgin HDPE made by the extrusion process. The main focus of the study was to evaluate the mechanical performance of the recycled HDPE and compare the results with virgin or non-recycled HDPE. The modulus of elasticity, tensile yield and ultimate strength, compressive yield and ultimate strength, flexural yield and ultimate strength and the coefficient of thermal expansion were the main parameters to be checked against the respective mechanical properties. Thus, pursuant to the rsults, it was found out that the modulus of elasticity and the tensile yield strength are lower in recycled HDPE compared to the non-recycled HDPE. However, there is no significant difference between the recycled and non-recycled HDPE for the tensile ultimate strength, compressive yield strength and compressive ultimate strength. The flexural yield strength and flexural ultimate strength properties of the recycled HDPE proved to be superior to those of the non-recycled HDPE. The coefficient of linear thermal expansion of the recycled HDPE s le was 130 μm/(m.°C) and that for the non-recycled HDPE was 142 μm/(m.°C).
Publisher: Periodica Polytechnica Budapest University of Technology and Economics
Date: 04-03-2021
DOI: 10.3311/PPME.17325
Abstract: This paper involves the design and construction of the intake manifold system of the FSAE car including the air shroud, air filter, throttle body, restrictor plenum, fuel injectors, fuel rail and runners. To ensure the quality, the proposed system is designed based on the FSAE rules. The design process of the intake manifold system will consist of the usual engineering processes including computer modelling, Finite Element Analysis and finally Computational Fluid Dynamics testing in order to determine the validity of the model and to tune the design in order to obtain the optimum performance out of the intake manifold system as a whole.
Publisher: Informa UK Limited
Date: 20-08-2020
Publisher: No publisher found
Date: 2021
DOI: 10.22306/AL.V8I1.200
Publisher: Technical University of Varna
Date: 31-12-2020
DOI: 10.29114/AJTUV.VOL4.ISS2.179
Abstract: This project was aimed at modelling the stress and deformation profile of a 6061-T6 aluminium suspension upright of a formula society of automotive engineers style vehicle with a double wishbone suspension under the loading conditions of a 1.5G corner. With these results, it would need to be determined whether the design is fit for use. Using remote displacement boundary conditions for the upper and lower wishbone connections and the control arm connection with a remote force at the centre of the wheel patch acting on the bearing surfaces the maximum stress, overall stress profile and maximum deformation of the upright was calculated. These results after, undertaking a verification and validation study, were a maximum equivalent von-Mises stress of 87.358MPa and a maximum bearing surface deflection of 0.21 mm. The maximum von-Mises stress calculated was less than the fatigue limit of 90MPa signalling infinite life and also less than the yield stress of 240MPa signalling a safe design. Verification and validation techniques were used to ensure the final result was accurate and reflected the real – life system. Structural error was used to verify the results where it was found that maximum structural error in the upright was 0.052mJ and at the location of maximum stress was between 0.0058-1.0782e-8 mJ. Validation of the model was achieved by comparing the reaction forces calculated in ANSYS to theoretical values and was found that the magnitudes were within 2.5% of the theoretical values, thus the model was considered valid.
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 12-2021
Publisher: Silesian University of Technology
Date: 03-2021
DOI: 10.20858/SJSUTST.2021.110.15
Abstract: Investigation on a designed and modified standard automatic transmission for a 2017 Yamaha Grizzly All-Terrain Vehicle was carried out to allow it to be controlled remotely and autonomously while maintaining its ability to be manually operated. The vehicle is a part of a project named AutoWeed. This project aims at developing a vehicle which can be used in the Australian outback to control and eradicate weeds. Preliminary tests were conducted on the vehicle to determine the performance parameters required to replace the movement supplied by the operator. Several devices used to achieve this motion were explored. It was concluded that the Motion Dynamics HB-DJ806 - LALI10010 electromechanical linear actuator be used as a proof of concept device for this application. This device is capable of exerting 200 N at 35 mm/seconds. It has a stroke length of 50 mm and was powered by a 12V DC motor, which drew 3 s at maximum load. Through testing, it was found that the selected actuator did not have enough stroke length to cycle through the five gears on the ATV. This error was rectified allowing the system to function as intended. To achieve a reliable design, however, the Linak LA14 actuator was purchased as a final design as it was stronger, faster and had feedback capabilities. Before procurement, the new actuator was digitally modelled using SolidWorks 2017 and 3D printed to confirm the mounting position and method. An ANSYS FEA was conducted on all the custom-made components including the actuator bracket and mounting plate to ensure reliability. The bracket model was manufactured using 3D printing from ABS. It was recommended that for reliability, the bracket should be constructed from a stronger material such as aluminium. The results gained from testing proved that the autonomous transmission system implemented was reliable and repeatable. This was justified as the system achieved a 100% success rate when cycling through gears.
Publisher: British Institute of Non-Destructive Testing (BINDT)
Date: 03-2005
Publisher: Springer Science and Business Media LLC
Date: 12-08-2020
Publisher: Ural State Mining University
Date: 15-09-2020
DOI: 10.21440/2307-2091-2020-3-90-106
Abstract: Relevance of the work. The Hopper and Bin design is the most commonly used technique of storing materials as it is a gravity fed system and is generally used for storing materials such as agricultural grains as well as mined minerals such as sand and coal. Mass flow, which is ideally the most desired flow type sees the bulk material travel uniformly with all particles in motion until all the material leaves the bin. The other types of flow generally occur with flat-bottomed bins with shallow hoppers are not seen as ideal as with this design problems such as arching and rat holing occur. The issue with the current design is that some of the material becomes stagnant in the bin, this can be costly as if the bulk material becomes stuck, degradation can occur over time. It can be observed for the Funnel and Expanded flow, the rat holing and arching occurring due to the stagnant material. Research Objective is to design a novel mass flow acrylic bin and hopper to store bulk quantities of sand without stagnation or degradation Methodology. Two separate experimental procedures were carried out including the measurement of the specific gravity of the sand, shear test and final hopper design. The data was then manipulated and plotted stress transformations and identified multiple key flow property constituents. Using values such as the yield loci and associative yield stresses the hopper half angle α and opening diameter B were tabulated. Results and Conclusions. The optimum opening diameter B for an uncompacted system is 2 mm and the hopper half angle α adjusted to 34.58o , this was tested and provided a successful mass flow hopper system. Overall, the techniques used with specific gravity and shear cell testing gave a sufficient insight into the appropriate procedure for designing efficient and accurate bin and hoppers. Then substituting the values gathered into the appropriate formulae provided a successful mass flow system for the intended bulk material which is sand.
Publisher: Wiley
Date: 12-1999
Publisher: Periodica Polytechnica Budapest University of Technology and Economics
Date: 09-07-2021
DOI: 10.3311/PPME.17554
Abstract: Improving the performance of idlers is paramount to the performance of the conveyor system in various industries since belt conveyors can be many kilometers in length and consequently there are a huge number of rollers in use. The key intention of this work is the development of a light-weight composite idler roller. Critical design considerations are strength-to-weight ratio and performance. Most importantly, the design must reduce the weight of the roller as compared to standard steel rollers. The final design provides a significant reduction in weight of about 47 % over that of traditional steel rollers of a similar size.
Publisher: Universidad Nacional de Colombia
Date: 23-11-2021
DOI: 10.15446/ACAG.V69N4.89795
Abstract: The sugar industry is an ideal sector for electricity cogeneration due to a large amount of burnable bagasse produce as a by-product. Bagasse produced in the sugar industry always consists of moisture affecting the efficiency of a boiler in the cogeneration plant. In our case study, a cogeneration plant run by bagasse burning found with bagasse moisture problem and suffocating with low power generation for the last few years. The boiler efficiency per tonne of bagasse is currently lower than optimal due to the substantial percentage of water present in the bagasse. A bagasse dryer design for this industry can improve the efficiency of a boiler as well as the cogeneration plant. In this paper, a pneumatic bagasse drying system is proposed to reduce the moisture content of bagasse from 48% to 30%. This work provides a full analysis of bagasse dryer design parameters, including specifications for dryer system components, such as feeders, fan, drying tube, and cyclone. The total bagasse drying system proposed is expected to be fitted within a 6 × 6 × 25 m space to dry 60 tph of bagasse, reducing the moisture content from 48% to 30%, in full compliance with all relevant Australian and company standards.
Publisher: Informa UK Limited
Date: 02-07-2020
Publisher: SAE International
Date: 30-10-2020
DOI: 10.4271/2020-01-5087
Publisher: SAE International
Date: 04-11-2020
DOI: 10.4271/2020-01-5088
Publisher: Conscientia Beam
Date: 09-09-2022
Abstract: This paper presents an effective way to control the temperature of bio-reactors (fermenters) used in ethanol production and to reduce the volume of cooling water required per square meter of ethanol produced. This paper specifically focuses on the fermentation of cassava starch using Saccharomyces cerevisiae at 32ºC. The flow across tube banks model is employed as the cooling mechanism of the bio-reactor. Cooling water at 28°C enters a shell containing five rows of fifteen (15) bio-reactors in a square in-line arrangement and exits the shell at 31.84°C. The total working volume of all fifteen (15) bio-reactors in the bank equals 180m^3. Each bio-reactor in the bank is designed to have an effective heat transfer area to volume ratio of two (2) to enhance heat transfer. The total quantity of cooling water required per cubic meter of ethanol produced is found to be 97.833m^3. A total amount of 1.303kW is required to power anchor impellers placed in each bio-reactor to provide mixing. The rotation speed of the impeller in each bio-reactor is 0.2〖rev·s〗^(-1). A total of 3.453*10^(-6) W is required to move cooling water through the bio-reactor bank at a speed of 3.942*10^(-5) ms^(-1). An overall heat transfer coefficient of 11.345W·m-2°C-1 was found for the bio-reactor cooling system. Employing flow across tube banks model in cooling ethanol bio-reactors required significantly less amount of cooling water per cubic meter of ethanol produced compared to using internal cooling coils.
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 09-2021
Publisher: Springer Science and Business Media LLC
Date: 11-03-2020
Publisher: Elsevier BV
Date: 10-2021
Publisher: SPIE
Date: 31-07-2003
DOI: 10.1117/12.484778
No related grants have been discovered for Greg Wheatley.