The Experts below are selected from a list of 4899 Experts worldwide ranked by ideXlab platform

Damien Lamouche - One of the best experts on this subject based on the ideXlab platform.

  • Titanium Alloy Milling Using Abrasive Water Jet for Repair Application: Modifications in Surface Quality and Material Integrity Following Plain Water Jet Cleaning
    2021
    Co-Authors: Xavier Sourd, Mehdi Salem, Redouane Zitoune, Akshay Hejjaji, Damien Lamouche
    Abstract:

    Abrasive Water Jet (AWJ) machining has proven to be an effective and versatile technique for milling various kinds of materials, even with low machinability such as aerospace grade titanium alloy Ti6Al4V. Many studies have been performed in order to master this technology and produce geometrically accurate shapes. However, in the context of bonding repairs which require surfaces free from foreign bodies, AWJ machining presents a significant drawback in form of abrasive grit embedment. The goal of this present work is then to investigate the effect of a post-AWJ machining Cleaning Operation using Plain Water Jet process (PWJ – i.e. without abrasive particles) on the surface quality and material properties. For this, several characterization techniques were employed. It was concluded that the contamination has been reduced by 65% without noticeable changes in depth of cut and crater volume. The AWJ milling Operation produced surface and subsurface hardening as well as biaxial compressive residual stress, mostly piloted by the jet pressure. PWJ Cleaning reduced the depth of hardening without clear modification in surface hardness.

  • Plain water jet Cleaning of titanium alloy after abrasive water jet milling: Surface contamination and quality analysis in the context of maintenance
    Wear, 2021
    Co-Authors: Xavier Sourd, Mehdi Salem, Redouane Zitoune, Akshay Hejjaji, Anis Hor, Damien Lamouche
    Abstract:

    Abrasive water jet (AWJ) milling process, though being an effective alternative to conventional machining for difficult-to-machine materials, induces abrasive embedment which is an issue for repair application by structural bonding. In this context, the effectiveness of Cleaning Ti6Al4V specimens by Plain Water Jet (PWJ) post AWJ milling is studied. For this, Ti6Al4V specimens are milled by AWJ process with varying parameters to create several levels of surface quality and contamination. Different characterization techniques have been used to perform a multi-scale analysis of the machined surfaces and surface quality has been quantified by an innovative criterion called “crater volume” (Cv). Then the specimens are subjected to PWJ Cleaning Operation (using a single set of parameters chosen after preliminary study). Finally, surface texture analysis and contamination quantification is performed and compared with the AWJ milled surfaces. The results revealed that PWJ Cleaning reduced the surface contamination by 65% without any significant change in Cv, surface texture and topology. However, it was found that it was impossible to dislodge deeply embedded particles. The comparison of pre and post-Cleaning contamination levels also revealed that PWJ Cleaning process efficiency depends on the AWJ milling parameters (mainly pressure).

Yan Qiao - One of the best experts on this subject based on the ideXlab platform.

  • CASE - Cyclic Scheduling Analysis of Single-arm Cluster Tools with Wafer Residency Time Constraint and Chamber Cleaning Operations
    2018 IEEE 14th International Conference on Automation Science and Engineering (CASE), 2018
    Co-Authors: Fajun Yang, Yan Qiao
    Abstract:

    In semiconductor manufacturing, a Cleaning Operation that takes significant time is required for eliminating the chemical residual in a chamber after a wafer being processed and removed from it. Such a Cleaning Operation makes a traditional backward strategy inefficient. In the existing work, it is shown that the productivity can be improved if some of chambers at a step are kept empty. With this idea, an extended backward strategy is proposed by deciding the optimal number of empty chambers. Based on such a strategy, this work studies the challenging problem for scheduling a single-arm cluster tool with both chamber Cleaning Operations and wafer residency time constraint for the first time. By building timed Petri net model for the system, two linear programs are proposed to determine the minimal cycle time and test the existence of a feasible schedule. At last, an industrial example is used to demonstrate the obtained results.

  • Efficient Approach to Cyclic Scheduling of Single-Arm Cluster Tools With Chamber Cleaning Operations and Wafer Residency Time Constraint
    IEEE Transactions on Semiconductor Manufacturing, 2018
    Co-Authors: Fajun Yang, Kaizhou Gao, Chunjiang Zhang, Yuting Zhu, Yan Qiao
    Abstract:

    In semiconductor manufacturing, with the shrinking down of wafer circuit widths, a strict quality control is required for wafer fabrication processes, resulting in that after a wafer being processed and removed from a chamber, a Cleaning Operation that takes significant time is performed for eliminating the chemical residual. Such a Cleaning Operation makes a traditional backward strategy for single-arm cluster tools inefficient. By the existing studies, it is shown that the productivity can be improved if some numbers of chambers at a step are kept empty. With this idea, an extended backward strategy is proposed by deciding the optimal number of empty chambers. Based on such a strategy, this paper studies the challenging problem for scheduling a single-arm cluster tool with both chamber Cleaning Operations and wafer residency time constraint for the first time. By building a timed Petri net model for the system, two linear programs are proposed to determine the minimal cycle time and test the existence of a feasible schedule and find it if existing. At last, two industrial examples are used to demonstrate the obtained results.

Takuya Shibata - One of the best experts on this subject based on the ideXlab platform.

  • Electrostatic Cleaning system for removal of sand from solar panels
    Journal of Electrostatics, 2015
    Co-Authors: Hiroyuki Kawamoto, Takuya Shibata
    Abstract:

    An improved Cleaning system has been developed that uses electrostatic force to remove sand from the surface of solar panels. A single-phase high voltage is applied to parallel wire electrodes embedded in the cover glass plate of a solar panel. It has been demonstrated that more than 90% of the adhering sand is repelled from the surface of the slightly inclined panel after the Cleaning Operation. The performance of the system was further improved by improving the electrode configuration and introducing natural wind on the surface of the panel, even when the deposition of sand on the panel is extremely high. The power consumption of this system is virtually zero. This technology is expected to increase the effective efficiency of mega solar power plants constructed in deserts at low latitudes.

  • electrostatic Cleaning system for removal of sand from solar panels
    Photovoltaic Specialists Conference, 2013
    Co-Authors: Hiroyuki Kawamoto, Takuya Shibata
    Abstract:

    A unique Cleaning system has been developed utilizing an electrostatic force to remove sand from solar panels. A single-phase voltage is applied to parallel wire electrodes embedded in a cover glass plate of a solar panel. It was demonstrated that more than 80% of the adhering sand was repelled from the surface of the slightly inclined panel, and the output power generated by the solar panel was recovered up to 80% after the Cleaning Operation. The power consumption of this system is virtually zero. This technology is expected to increase the efficiency of mega solar power plants constructed in deserts at low latitudes.

Aref Maalej - One of the best experts on this subject based on the ideXlab platform.

  • Innovative design of an underwater Cleaning robot with a two arm manipulator for hull Cleaning
    Ocean Engineering, 2019
    Co-Authors: Saber Hachicha, Chiheb Zaoui, Habib Dallagi, Samir Nejim, Aref Maalej
    Abstract:

    Abstract The fouling is a major problem that occurs to the ship's hull. This phenomenon causes severe economic and ecological consequences of shipping activities. Therefore, several robotic solutions were developed to mitigate fouling problem and to robotize hull-Cleaning process. However, the existing solutions are either slow remotely operated vehicles or fast - but non-transportable - Cleaning station equipped with manipulator's arms. In this paper, we aim to combine the transportability of the remotely operated vehicle solution and the Cleaning efficiency offered by the use of arm manipulators. Hence, we present an innovative design of an underwater ship hull-Cleaning robot called ARMROV by attaching two-manipulator arms to a remotely operated vehicle. However, in this new design, the robot central part is subject to dynamic stability issues during the Cleaning Operation that are caused by coupling forces between arms and the central part. In order to evaluate perturbations on the center part of the ARMROV, the kinematic and the dynamic model of the manipulator's arms were developed performed using Khalil-Kleifinger and Newton-Euler methods respectively. The dynamic stability during the hull Cleaning Operation was studied and checked using dynamic equivalence approach. Simulations results proved the efficiency of the stability approach and the feasibility of the proposed solution. In conclusion, the suggested design represents a promising stable and efficient solution for hull underwater Cleaning.

  • Study and modeling of a hull Cleaning station with an arm manipulator
    2018 International Conference on Advanced Systems and Electric Technologies (IC_ASET), 2018
    Co-Authors: Saber Hachicha, Chiheb Zaoui, Samir Nejim, Aref Maalej, Habib Dallagi
    Abstract:

    The underwater hull Cleaning is a center of interest of a big number of researchers from the fifties. Here we aim to facilitate the Cleaning of the hull using a new robotic system with an arm manipulator. We developed the geometric and the dynamic modeling of the station components. In fact, the station has seven degrees of freedom four rotations and three translations. Besides, we used the SimMechanics software for the dynamic simulation of the station. In conclusion, our study shows that the underwater station with arm manipulator can be important for the hull Cleaning Operation.

Habib Dallagi - One of the best experts on this subject based on the ideXlab platform.

  • Innovative design of an underwater Cleaning robot with a two arm manipulator for hull Cleaning
    Ocean Engineering, 2019
    Co-Authors: Saber Hachicha, Chiheb Zaoui, Habib Dallagi, Samir Nejim, Aref Maalej
    Abstract:

    Abstract The fouling is a major problem that occurs to the ship's hull. This phenomenon causes severe economic and ecological consequences of shipping activities. Therefore, several robotic solutions were developed to mitigate fouling problem and to robotize hull-Cleaning process. However, the existing solutions are either slow remotely operated vehicles or fast - but non-transportable - Cleaning station equipped with manipulator's arms. In this paper, we aim to combine the transportability of the remotely operated vehicle solution and the Cleaning efficiency offered by the use of arm manipulators. Hence, we present an innovative design of an underwater ship hull-Cleaning robot called ARMROV by attaching two-manipulator arms to a remotely operated vehicle. However, in this new design, the robot central part is subject to dynamic stability issues during the Cleaning Operation that are caused by coupling forces between arms and the central part. In order to evaluate perturbations on the center part of the ARMROV, the kinematic and the dynamic model of the manipulator's arms were developed performed using Khalil-Kleifinger and Newton-Euler methods respectively. The dynamic stability during the hull Cleaning Operation was studied and checked using dynamic equivalence approach. Simulations results proved the efficiency of the stability approach and the feasibility of the proposed solution. In conclusion, the suggested design represents a promising stable and efficient solution for hull underwater Cleaning.

  • Study and modeling of a hull Cleaning station with an arm manipulator
    2018 International Conference on Advanced Systems and Electric Technologies (IC_ASET), 2018
    Co-Authors: Saber Hachicha, Chiheb Zaoui, Samir Nejim, Aref Maalej, Habib Dallagi
    Abstract:

    The underwater hull Cleaning is a center of interest of a big number of researchers from the fifties. Here we aim to facilitate the Cleaning of the hull using a new robotic system with an arm manipulator. We developed the geometric and the dynamic modeling of the station components. In fact, the station has seven degrees of freedom four rotations and three translations. Besides, we used the SimMechanics software for the dynamic simulation of the station. In conclusion, our study shows that the underwater station with arm manipulator can be important for the hull Cleaning Operation.