WorldCat Identities

Baili, Maher

Works: 9 works in 10 publications in 2 languages and 17 library holdings
Roles: Other, Author, Opponent, Thesis advisor
Publication Timeline
Most widely held works by Maher Baili
Analyse et classification de manipulateurs 3R à axes orthogonaux by Maher Baili( Book )

2 editions published in 2004 in French and held by 3 WorldCat member libraries worldwide

The work presented in this thesis deals with the classification and analysis of 3-revolute (3R) orthogonal positioning manipulators. The goal is to establish an exhaustive classification based on the topology of their workspace. The workspace is characterized in a half-cross section by the singular curves. The workspace topology is defined by the number of cusp and node points that appear on these singular curves. This dissertation is devised into four sections. The first section is dedicated to a state of the art on serial positioning manipulators and more precisely on their kinematic properties and their singular curves. In the second section, an exhaustive classification of one family of 3R manipulators such that r3 = 0 is proposed. The design parameter space is divided into nine workspace topologies. All kinematic properties are given for each workspace topology. A new necessary and sufficient condition for a manipulator to be cuspidal (can change posture without meeting singularity) is established as function as the DHm parameters. The third section deals with the classification of a larger family of manipulators (r3 . 0). Last section is dedicated to the analysis of these manipulators according to two performance criteria. The first one is relative to the maximum and average condition numbers. The second one is relative to the proportions of regions of two and four inverse kinematic solutions, the domain reachable by the end effector compared to a sphere centred on the origin and including the workspace. Results presented in this thesis can be used as an efficient help for the design of new manipulators. In effect, for a particular task, the designer can choose the most suitable workspace topology. Then, manipulator DHm parameters are set according to the performance criteria studied
Pre-hole diameter optimization in high speed drilling considering machining cost by Monia Ben Meftah( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Experimental investigation of tool wear and its effect on TiSiN-coated ball-end mill geometry in high-speed milling by Rami Belguith( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Compensation of machining errors of Bspline and Cspline by El Bechir Msaddek( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Analytical modeling of the CNC machine axis motion in high-speed milling with local smoothing by Mohamed Essid( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Simulation of machining errors of Bspline and Cspline by El Bechir Msaddek( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

The relationship between the cutting speed, tool wear, and chip formation during Ti-5553 dry cutting by Vincent Wagner( )

1 edition published in 2014 in English and held by 2 WorldCat member libraries worldwide

Développement d'une méthodologie pour la fabrication additive dans un contexte de fabricaion de pièces métalliques par usinage. by Vincent Benoist( )

1 edition published in 2020 in French and held by 1 WorldCat member library worldwide

More and more, and particularly in metal additive manufacturing, major contractors are asking their first-rank suppliers to participate in the development of new products and / or new techniques in order to reduce development times and the costs of obtaining products. The Cousso company, already widely recognized in machining, launched this CIFRE thesis in order to develop the integration of machining constraints at the very level of the design of additively manufactured parts. To do this, an adaptation of the «Design for Additive Manufacturing» (DfAM) method has been specifically developed, in particular by integrating the machining constraints into topological optimization. It was first shown that the machining forces were sometimes the highest forces that the part underwent during its life. It was then shown that topological optimization method, thought to provide the optimal design, actually offer a whole family of near-optimal shapes and that it was quite possible to select and orient the best designs, allowing a better manufacturability of the part. Another axis of research concerns the removal of supports, which in metal additive manufacturing pose serious problems. To help designers choose the most suitable supports for machining, among the immensity of currently possible supports, a very concrete methodological approach was proposed and implemented to make choices of supports, tools, and cutting conditions, and being applicable in an SME context
Proposition de stratégies de surveillance d'usinage en perçage de superalliage base nickel, application à l'usure de l'outil by Andrei Popa( )

1 edition published in 2012 in French and held by 1 WorldCat member library worldwide

The work presented in this thesis is a part of European project ACCENT and fits into the context of using process monitoring in the manufacture of critical parts for aircraft engines. The aim is to define a monitoring technique for the tool wear in the machining of the central bore of a high pressure disk made in nickel based superalloy. The major stages can be identified in our approach: identification of tool failure modes in drilling Udimet® 720 LI, defining the relationships between wear and measured physical quantities and finally, a proposal for monitoring strategies based on the previous results. In order to complete the objectives, an experimental protocol was defined. The experimental campaigns allowed us to characterize the drill wear and to define cartography of tool failure modes depending on cutting conditions tested. Moreover, the impact of machining disturbances (lubricant stop, change in percentage of lubricant emulsion, the position over the before hole, etc.) was studied. In the second part, the relations between the tool failure modes and monitoring signals recorded during the machining (forces, torque, power, vibrations, etc.) were identified. For this task, we focused on two directions: a straightforward explanation of signals evolution by physical phenomena and “black box” approach to develop wear models from a database obtained by statistical criteria extracts from the signals. This analysis also allowed the detection of certain machining disturbances using the physical quantities. These include an eccentricity of the tool in the tool holder and a chips evacuation problem. The third part concerns the signals sensitivity to detect the different phenomena and the definition of monitoring strategies which can be implemented. For each relation defined, a detection probability was determined. Further, we used signals in parallel to increase the robustness of detection. The probabilities were improved, with an assumption of independent signals (without calculating existing biases). Finally, the combination of the phenomenological approach to the so-called "statistical" has increased the robustness of the monitoring technique
Audience Level
Audience Level
  General Special  
Audience level: 0.96 (from 0.91 for Analyse et ... to 0.97 for Analyse et ...)