Wednesday, 15 November 2017

Maintenance strategies: Preventive and Corrective

Among different types of maintenance strategies that were introduced before, preventive and corrective maintenance can be called the main strategies. 
Preventive maintenance actions are generally referred to those actions that are applied on the structure regularly and that try to maintain the structure from unexpected failures and keep it working.  Preventive maintenance defers the degradation process, hence, it extends the time needed for corrective actions and operational capacity will be increased. In the other hand, because they are performed timely and based on a routine, therefore, less large scale repairs are required. In practice, a preventive maintenance schedule may include things such as cleaning, lubrication, oil changes, adjustments, repairs, etc.

Corrective maintenance is another strategy which will be applied on a structure when a flaw is detected. The purpose of the corrective maintenance is to restore the operational capacity of the structure to an acceptable level. according to the importance of the flaw a corrective action can be applied immediately or deferred for a certain time. There are different types of actions included in corrective maintenance and the application of each depends on the defect situation. In worst case scenario replacement of the component of structure is the final solutions. 

Maintenance strategies, RD/GD-210, 2007 


Stay tuned for the next post ;)



Monday, 2 October 2017

Structural Maintenance Planning


Maintenance planning for structures, for a long time, was a concept of keeping the structure in a good shape, hence, it can perform its expected duties. Yet, because of financial and physical limitations in the old definition, operational managers had to provide a more comprehensive description for maintenance of structures. Hence, a more professional definition for structural maintenance would be defined as: "Total technical activities in the component level connected to each other and economically balanced, in order to keep or get the structure in such a condition that it can accomplish its duties for a certain period of time with sufficient reliability, availability, serviceability, and durability” Toorn (1996).  

According to the new definition, some targets such as maintenance and managerial targets could be identified. Maintenance targets try to assure an adequate level of reliability, availability, etc. and managerial targets mainly aim to minimise the associated maintenance costs. These targets will provide some tools and indicators which are so helpful to mathematically formulate the problems in structural maintenance planning. For instance, Annual reliability index can be used as an indicator if the purpose of maintenance planning is to reach a certain level of reliability or maximise it as affordable as possible.

Structural maintenance can include different kinds of actions which regarding to the type of action and their influence on the degradation process can be divided into four categories:
1- Preventive maintenance, 2- corrective maintenance, 3- observational maintenance, and 4- non-inspection maintenance. 

Differences between these categories will be explained in next posts.    
Bridge maintenance: repainting (Photo: Fox Photos / Getty Images)

Tuesday, 30 May 2017

Introducing ESR-10


Collect your stuff and apply for Marie Curie actions; ESR-10 in Paris
Hi Everyone,

Before getting so serious and talking about engineering stuff, let me to introduce myself first. My name is Morteza and I am from Iran (a beautiful country with warm-blooded people). I received my bachelors degree in marine engineering and naval architecture from Amirkabir University of Technology in Tehran. I found this university so interesting and full of great students and faculty board, so I decided to continue my master's education in the same university but in hydro-mechanics. After I finished my first master's, I wanted to have some studies in another field of engineering and to experience living in another country, therefore I moved to Istanbul\Turkey and started studying industrial and systems engineering. I received my second master's degree from Istanbul Sehir University. I would like to mention that living in Istanbul is JUST amazing. 

Meanwhile, I got familiar with Marie Skłodowska-Curie actions and I was hoping to become a researcher under this program since they provide you a very good environment to conduct research among different institutions in several countries, and under the supervision of excellent professors and researchers. Finally and gladly, in the right moment, just after I defended my second master's thesis in Reliability Engineering, I found INFRASTAR which is a framework for Innovation and Networking for Fatigue and Reliability Analysis of Structures. I applied for some positions under this program and I was accepted as ESR10 which my project topic is "Optimal maintenance planning of existing structures using monitoring data".  

My host institution is PHIMECA Engineering in France which is an engineering company specialised in optimisation,  reliability and robustness of products and structures. Also, I am enrolled as a PhD student in SIGMA Clermont. I work under supervision of five great professors and researchers. Dr. Thierry Yalamas and Guillaume Causse from PHIMECA, Dr. Nicolas Gayton and Dr. Cecile Mattrand from Sigma, and Dr. André Orcesi from IFSTTAR

Thanks in advance for reading my first article 😊

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Maintenance strategies: Preventive and Corrective

Among different types of maintenance strategies that were introduced before, preventive and corrective maintenance can be called the main ...