| 1. |
- Leva, Alberto, et al.
(författare)
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Explicit Model-Based Real PID Tuning for Efficient Load Disturbance Rejection
- 2019
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Ingår i: Industrial & Engineering Chemistry Research. - : AMER CHEMICAL SOC. - 0888-5885 .- 1520-5045. ; 58:51, s. 23211-23224
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Tidskriftsartikel (refereegranskat)abstract
- In the process control, many PID loops are primarily devoted to rejecting load disturbances, and some of them are crucial for the quality of the overall plant operation. In such a scenario, automatic tuning is highly desired. However, load disturbance rejection calls for strong feedback up to quite high frequencies with respect to the dominant plant dynamics, on which most tuning rules are centered. As such it is difficult for a rule to yield good and, above all, uniform results in the face of all the various process structures it can be confronted with. In this paper, we propose an explicit model-based PID tuning rule specifically targeted at the problem just evidenced. The rule minimizes the magnitude of the nominal disturbance-to-output frequency response, at the same time preventing that magnitude to exhibit a peak or a plateau around its maximum. This characteristic, together with tuning the PID derivative filter, leads to sharp disturbance rejection without incurring in an excessive control sensitivity to high-frequency measurement noise and mitigates the problems caused by heterogeneous process dynamics. The proposed approach is assessed by comparing the rule with selected counterparts, on a literature benchmark with different process structures. A laboratory experiment is finally presented to show that our rule can withstand real-world operating conditions.
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| 2. |
- Leva, Chiara, et al.
(författare)
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The challenge of system Change in aviation : The MASCA project
- 2012
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Ingår i: Advances in Safety, Reliability and Risk Management -. - : Taylor & Francis Group. - 9780415683791 ; , s. 1825-1832
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Konferensbidrag (refereegranskat)abstract
- Within the aviation industry the need for sustainable change is becoming more and more impera-tive. Change is in fact something being imposed on the industry from a number of sources (e.g Upcoming Regulations, increasing commercial pressure and the introduction of new technologies) and the need for change management skills and capability within organisations is increasing.The paper presents the initial needs and case study upon which a research project sponsored by European Union to deliver a structure to manage the acquisition and retention of skills and knowledge, through training on organisational processes for managing change. The Project called MASCA takes an action research approach with a primary focus on the transfer of change management capability into the organisations that are responsible for and involved in change initiatives.
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| 3. |
- McDonald, Nicholas, et al.
(författare)
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The Challenges of Organizational Change: what has Human Factors to offer?
- 2011
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Ingår i: Proceedings of the IES annual conference 2011. ; , s. 48-57
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Konferensbidrag (refereegranskat)abstract
- Within the aviation industry the need for sustainable change is becoming more and more unavoidable. Change is in fact something being imposed on the industry from a number of sources (e.g. Upcoming Regulations, in-creasing commercial pressure and the introduction of new technologies) and the need for change management skills and capability within organisations is increasing. The paper presents the initial approach to answer those needs in a research project called MASCA (MAnaging System Change in Aviation. The project is sponsored by European Union to deliver a structure to manage the acquisition and retention of skills and knowledge, through training on organisational processes for managing change. MASCA takes an action research approach with a primary focus on the transfer of change management capability into the organisations that are responsible for and involved in change initiatives; especially in the area of performance management in safety.
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| 4. |
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| 5. |
- Rignér, Johan, et al.
(författare)
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Study of safety performance indicators and contributory factors aspart of an airline systemic safety risk data model
- 2009
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Ingår i: In proceedings of the IEA 2009, 17th World Congress on Ergonomics.
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Konferensbidrag (refereegranskat)abstract
- Every airline would like to anticipate potential risks by allowing the organization to be both predictiveand proactive in its safety work. This is also mandated by regulators, such as ICAO, in the form ofrequirements for a safety management system. In order to successfully achieve this, a systemic view ofhuman factors, risks for both the organization and its operations are required. Relationships betweenincident outcomes and contributory factors needs to be further understood. This would involve theclassification of risk data, contributory factors for risk, data-handling from multiple risk data sourcesand the prudent use of safety performance indicators given the availability of existing tools to date.An earlier study (Rignér et al., 2009) proposed a methodology for airlines to explore ways of betterutilizing data already in their organization by the use of existing tools. This methodology includes thesteps of reviewing risk theory, the scope for human factors related to safety, safety performanceindicators, contributory factors and links between these as well as tools for collecting data. The purposeof this study is to apply, validate and further develop this methodology for airline operators as well asto develop a coherent model of systemic risk data management.One of the key issues here is to define the logic behind data management of existing, current andhistorical data and particularly how data can be combined to provide a prospective view of future risk.Without a clear strategy on how to do this, airlines may lose focus and revert to simply measuring whatis readily available, but potentially less meaningful.Research leading up to this development was performed within the HILAS (Human Integration into theLifecycle of Aviation Systems) project. The work has included field studies, work shops and interviewswith both front-line operators and management personnel within airlines. Information-sharing takesplace within the framework of the HILAS project. This research was conducted by a multidisciplinarygroup of human factors expertise: researchers, pilots, investigators and safety officers in an airline.
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