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Full-Text Articles in Social and Behavioral Sciences
A Sensor Fault Detection Strategy For Air Handling Units Using Cluster Analysis, Rui Yan, Zhenjun Ma, Georgios Kokogiannakis, Yang Zhao
A Sensor Fault Detection Strategy For Air Handling Units Using Cluster Analysis, Rui Yan, Zhenjun Ma, Georgios Kokogiannakis, Yang Zhao
Faculty of Engineering and Information Sciences - Papers: Part A
Sensors are an essential component in the control systems of air handling units (AHUs). A biased sensor reading could result in inappropriate control and thereby increased energy consumption or unsatisfied indoor thermal comfort. This paper presents an unsupervised learning based strategy using cluster analysis for AHU sensor fault detection. The historical data recorded from sensors is first pre-processed to reduce the dimensions using principal component analysis (PCA). The clustering algorithmOrdering Points to Identify the Clustering Structure (OPTICS) is then employed to identify the spatial separated data groups (i.e. clusters),which possibly indicate the occurrence of sensor faults. The data points in …
Predication Of The Behaviour Of Bulk Materials In The Design And Operation Of Bulk Handling And Processing Plants, David Hastie, Peter Wypych, Andrew Grima, Richard La Roche, David Curry
Predication Of The Behaviour Of Bulk Materials In The Design And Operation Of Bulk Handling And Processing Plants, David Hastie, Peter Wypych, Andrew Grima, Richard La Roche, David Curry
David Hastie
It is very dangerous to assume or extrapolate anything when it comes to bulk material properties and behaviour. Traditional methods for flow prediction, such as hand calculation or even just relying on past experience, require assumptions to be made about the bulk material properties and flow. Although these materials may have generic names and possess similar properties (e.g. coal, iron ore), they can all behave quite differently under dynamic conditions. What we end up designing for one part of the plant may be quite different to what is needed in another part of the plant, which may be handling or …
Incremental Service Level Agreements Violation Handling With Time Impact Analysis, Azlan Ismail, Jun Yan, Jun Shen
Incremental Service Level Agreements Violation Handling With Time Impact Analysis, Azlan Ismail, Jun Yan, Jun Shen
Faculty of Engineering and Information Sciences - Papers: Part A
This research addresses a critical issue of service level agreement (SLA) violation handling, i.e., time constraint violation related to service-based systems (SBS). Whenever an SLA violation occurs to a service, it can potentially impact dependent services, leading to unreliable SBS. Therefore, an SLA violation handling support is much required to produce a robust and adaptive SBS. There are several approaches to realizing exceptions and faults handling support for SBS, focusing on the detection stage, the analysis stage, and the resolution stage. However, the current works have not considered the handling strategy that takes the impact information into account to reduce …
Predication Of The Behaviour Of Bulk Materials In The Design And Operation Of Bulk Handling And Processing Plants, David Hastie, Peter Wypych, Andrew Grima, Richard La Roche, David Curry
Predication Of The Behaviour Of Bulk Materials In The Design And Operation Of Bulk Handling And Processing Plants, David Hastie, Peter Wypych, Andrew Grima, Richard La Roche, David Curry
Faculty of Engineering and Information Sciences - Papers: Part A
It is very dangerous to assume or extrapolate anything when it comes to bulk material properties and behaviour. Traditional methods for flow prediction, such as hand calculation or even just relying on past experience, require assumptions to be made about the bulk material properties and flow. Although these materials may have generic names and possess similar properties (e.g. coal, iron ore), they can all behave quite differently under dynamic conditions. What we end up designing for one part of the plant may be quite different to what is needed in another part of the plant, which may be handling or …
Robust Yaw Moment Control For Vehicle Handling And Stability, Haiping Du, Nong Zhang, Wade Smith
Robust Yaw Moment Control For Vehicle Handling And Stability, Haiping Du, Nong Zhang, Wade Smith
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a robust yaw moment controller design approach for improving vehicle handling and stability. With considering the parameter-varying property of tyre cornering stiffness in extreme handling situations, a linear parameter-varying (LPV) model in polytopic form is constructed to represent the nonlinear characteristics of tyres. A yaw moment controller is then designed for the LPV model which aims at optimising the tracking performance on both yaw rate and sideslip angle with respect to their targets. The conditions for designing such a controller are derived in terms of linear matrix inequalities (LMIs). Numerical simulations on a nonlinear vehicle model are …