A Practical Approach to Mitigate the Excessive Vibration of a Piping System Subjected to Flow-Induced Excitation

2016 ◽  
Author(s):  
Reza Azizian ◽  
Paolo Torrado
Keyword(s):  
High Stress ◽  
Fretting Wear ◽  
Piping System ◽  
System Failure ◽  
Industrial Facilities ◽  
System A ◽  
Vibration Problems ◽  
Different Sources

Vibration is a common problem in industrial facilities which may lead to the propagation of undesired high stress levels induced by the deflection of a component as well as the interaction between different metallic components. In a piping system, a long term excessive vibration may cause fatigue and fretting-wear which may result in system failure. In the present work, excessive vibration problems in a piping system were explored in greater detail. Different sources of vibration, as well as proper approaches to evaluate and assess the integrity of the system, were investigated. A case study of a piping system subjected to flow-induced excitation was assessed. This assessment was established based upon both numerical modeling of the system utilizing CAESAR II software and vibration readings of the piping system while operating in an industrial facility. Furthermore, an experimental modal analysis was implemented using ME’scope software to calibrate the numerical model. Theoretical and operational modal analyses were performed in order to adopt proper modifications to mitigate the excessive vibration.

Green Urban Public Bikes Rental System: A Case Study of Taipei YouBike

2013 ◽  
Vol 723 ◽  
pp. 968-975
Author(s):  
Hui Hua Yang
Keyword(s):  
Urban Areas ◽  
System Analysis ◽  
Clear Indication ◽  
The Public ◽  
Public Transport System ◽  
System A ◽  
Actual Experience ◽  
Taipei City

Public bikes rental system is an innovative scheme of rental bicycles in urban areas and can be seen as part of the public transport system. This study investigates the users of Taipei YouBike rental system, analysis their intention and behaviors, pre-expectation and actual experience on satisfaction. The result indicates that the users were mostly from long term annual fee commuters. The result also reveals distinct discrepancies between pre-expectation and actual experience, especially in distributes of safety routes and environments and clear indication of signs on bike routes. The findings can be used for Taipei City to improve the urban bicycle program and make more effort to develop safety cycling infrastructures and amenities.

Making decentralised systems viable: a guide to managing decentralised assets and risks

2007 ◽  
Vol 56 (5) ◽  
pp. 165-173 ◽  
Author(s):  
J. Willetts ◽  
S. Fane ◽  
C. Mitchell
Keyword(s):  
Risk Management ◽  
Asset Management ◽  
Central Place ◽  
System A ◽  
Decentralised Systems ◽  
Wastewater Systems ◽  
Key Aspects ◽  
Improved Methods

Decentralised systems have the potential to provide a viable option for long term sustainable management of household wastewater. Yet, at present, such systems hold an uncertain status and are frequently omitted from consideration. Their potential can only be realised with improved approaches to their management, and improved methods to decision-making in planning of wastewater systems. The aim of this paper is to demonstrate the value of a novel framework to guide the planning of decentralised systems so that asset management and risk management are explicitly considered. The framework was developed through a detailed synthesis of literature and practice in the area of asset management of centralised water and wastewater systems, and risk management in the context of decentralised systems. Key aspects of the framework are attention to socio-economic risks as well as engineering, public health and ecological risks, the central place of communication with multiple stakeholders and establishing a shared asset information system. A case study is used to demonstrate how the framework can guide a different approach and lead to different, more sustainable outcomes, by explicitly considering the needs and perspectives of homeowners, water authorities, relevant government agencies and society as a whole.

scholarly journals Collaboration and Competition Policy in a Market-Based Hospital System: A Case Study from the Netherlands

2020 ◽  
Vol 16 (2) ◽  
pp. 262-288
Author(s):  
Wouter van der Schors ◽  
Ron Kemp ◽  
Marco Varkevisser
Keyword(s):  
Competition Policy ◽  
Healthcare Providers ◽  
Self Assessment ◽  
Hospital System ◽  
System A ◽  
Ex Post ◽  
Self Assessments ◽  
Post Assessment

Abstract In the Dutch healthcare system, provider competition is used as a tool to improve efficiency. From a competition policy perspective, little is known about how collaboration among healthcare providers contributes to overall patient welfare, and how a balance is achieved between scale benefits and preventing anti-competitive collusion. This paper examines the ex-post effects of a Dutch case study in which three competing hospitals have collaborated to provide high-complexity low-volume cancer surgery, an arrangement that tests the limits of permissibility under the Dutch cartel prohibition. Our preliminary empirical research demonstrated only a modest increase in price and travel time for some of the tumour surgeries. Volume analysis showed that the intended centralization of surgical procedures has not been fully realized. Our findings highlight the importance of a comprehensive self-assessment by the collaborating hospitals to ex-ante assess (potential) efficiencies and antitrust risks. Such self-assessments could benefit from research focused on which collaborations are most appropriate to achieve quality gains. For the ex-post assessment by competition authorities following the cartel prohibition, a more thorough insight into the (long-term) changes in hospital prices, profitability, and quality after collaboration is needed.

Sign in / Sign up

Export Citation Format

Share Document