Ali el Kihel

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• Professor
• Professor (Full) at Mohamed I University

Within rotating machines, tiny imperfections can cause significant vibration amplifications, representing a risk to their proper functioning while leading to a deterioration in the quality and quantity of production. This study examines the impact of unbalance defects on the energy consumption of an industrial system, through the application of two...

The evolution of technologies and customer expectations, coupled with market pressure, leads to the search for the permanent optimization of industrial processes. Improving plant performance is imperative to reduce costs and offer innovative, high-quality products delivered on time. In this context, the future industry intends to consolidate the be...

Today's industry presents many challenges whose increasing competitiveness weighs heavily on productivity. A new way of organizing industrial processes involves the use of precise technologies and the digitization of measured data from the production apparatus. This new organization must meet the challenges of competitiveness to meet customer expec...

Predictive maintenance (M4.0) allows more targeted and efficient use of resources, reduces unplanned downtime, and increases production and equipment performance compared to classical existing maintenance (M3.0). This paper deals with the development of a new ecosystem that adopts the new technologies of Industry 4.0 to drive real-time monitoring a...

The risk associated with steam boilers comparing to other equipment and machinery is very important, and accidents are fatal when the conditions of use of such devices are not complying with current regulations. Global regulations attach a great importance to the minimum requirements applicable to steam boilers, these requirements cover all aspects...

Digitalization and digitization are topics for researchers and manufacturers. Integrating new technologies facilitates the collection of data from a company in real-time and processing them afterwards. In this context, the design and implementation of Maintenance 4.0 have become popular in the literature. Its objective is to minimize downtime, opti...

Steam loss affects energy performance of thermal installations and increases energy bills. Some loss comes in the form of manageable and remediable leaks, while others are difficult to detect and to control. As a part of quality control of thermal installation within a company specialized in agri-food industry, we carried out diagnosis using therma...

The transformation to Supply Chain (SC) 4.0 promises new opportunities for companies to gain competitiveness. The Lean Value Stream Mapping (VSM) tool allows the supervision of all the processes of the entire SC, from which we can identify the different types of waste that hinder the competitiveness of the SC. Following the existing problems detect...

Since the industrial revolution, energy consumption is still increasing, this increase is losing companies Thousands of DHs and negatively influence the environment, for this reason companies thought to manage their energy consumption by applying a system called an energy management system. This allows companies to limit energy waste and improve th...

In the agroindustry, Boilers are widely used to heat water or produce steam, usually through the energy released by the combustion of a fuel, to power the facilities by steam (Figure 1). One of the main objectives to reduce energy consumption is the optimization and improvement of energy efficiency. The use of artificial intelligence allows today t...

The implementation of industry 4.0 type solutions for the maintenance of production assets is a recent topic for researchers and industries around the world. In fact, the transformation of maintenance based on new technologies has been germinating for several years. Today, the concepts of intelligent maintenance and maintenance 4.0 are becoming pop...

In the industrial environment, production systems are increasingly complex and cannot be free from disturbances and failures. Indeed, the following study is considered as a point of change in the service domain to effectively track disturbances and failures, by allowing the transition from old maintenance to smart maintenance. However, the followin...

Today's industry presents many challenges whose the competitiveness weighs heavily on productivity. The future industry or industry 4.0 requires a new way for organizing industrial processes and must integrate smarter maintenance tools capable of greater adaptability in production. This new organization must respond to competitiveness challenges to...

The assembly of metal structures by welding is very developed in the industry, in particular the pressure vessels: boilers, tanks, etc. In the case of boilers that produce hot water and steam, it is very interesting to reduce heat losses in the welds. The objective of our work is to analyze the defects of the welded structures using two methods: ph...

This study aims to compare the advantages of infrared thermography (IRT) in passive and active use. The IRT is a non-contact, fast and wide-area of inspection nondestructive testing (NDT) technique that has been increasingly used in different fields to detect the presence of faults in assets. Indeed, the detection of faults in an early time allows...

This study aims to highlight a methodology for implementing an energy audit plan within industries. Today, international competitiveness involves optimizing companies’ production costs. This necessarily requires the implementation of rigorous energy saving policies. These savings are measures taken to limit energy consumption or to avoid energy los...

Boiler performance and efficiency evaluation is generally performed by direct and indirect methods as reported in three boiler performance evaluation codes which will be the subject of our study (ASME PTC4-2008, IS13979: 1994 and BS845-1: 1987 codes). On the one hand, ASME code PTC4-2008 describes in detail the indirect method with different types...

This study covers the new benefits of using predictive maintenance in industries. Reducing unplanned downtime, increasing productivity, and feeling safe and reliable are the most common benefits of predictive maintenance. Recently, it has been used as a tool for energy efficiency and reducing energy consumption. The objective of this article is to...

Unbalance is one of the most common defects in rotating machinery that causes important vibrations and subsequently an increase in energy consumption. Unbalance is defined as un-equal distribution of weight around the center of rotation. Although vibration, heat and noise are usually the results of mechanical defects, vibrations present the most re...

This study covers the analysis of the heat can be generated by mechanical vibrations. Vibrations are an essential indicator in the industry, which evaluate and monitor the condition of the machines. In practice, when a machine vibrates under higher frequencies causes higher displacement, noise, and heat generation. Infrared thermography is among th...

In this study we present an evaluation of the energy consumption in the case of shaft misalignment. Misalignment is one of the most common defects in rotating machinery that causes noticeable losses of energy. The proposed methodology focuses on finding a correlation between vibration level and energy consumption for different degrees of misalignme...

The assembly of metal structures by welding is very developed in the industry, in particular the pressure vessels: boilers, tanks, etc. In the case of boilers that produce hot water and steam, it is very interesting to reduce heat losses in the welds. The objective of our work is to analyze the defects of the welded structures using two methods: ph...

In this paper, we describe an experimental device based on an infrared thermography technic, which allows observing thermal phenomena. The three-phase asynchronous motor ASM, used in this work, is mounted on a base plate with an alignment device. It has two poles, an operating frequency of 50 Hz, a useful power of 0,55 kW and a frequency converter...