The Experts below are selected from a list of 702 Experts worldwide ranked by ideXlab platform

Lin Y - One of the best experts on this subject based on the ideXlab platform.

  • Flame retardant property of flax fabrics coated by extracellular polymeric substances recovered from both activated sludge and aerobic granular sludge
    'Elsevier BV', 2020
    Co-Authors: Nk Kim, Mao N, Lin R, Bhattacharyya D, Van Loosdrecht Mcm, Lin Y
    Abstract:

    In this research, extracellular polymeric substances (EPS), such as EPSflocs and EPSgranules, were successfully extracted from activated and aerobic granular sludge, respectively, and tested as bio-based flame retardant materials. Flax fabric was coated by the biopolymeric substances and its flammability was evaluated based on a vertical burning test defined in US Federal Aviation Regulation. Both EPSflocs and EPSgranules coated flax fabrics achieved the self-extinguishment due to effective char formation. In particular, the result of the EPSgranules coated sample met the Aviation requirements for the aircraft interior. Moreover, the presence of carbonated hydroxyapatite was identified in EPSgranules char residue by using FTIR and XRD analysis. It can contribute to the self-extinguishing property of the fabric by enhancing char formation. Thermogravimetric analysis also demonstrated that EPSgranules coated flax was able to produce greater amount of char residue and its decomposition rate was significantly reduced. This research indicates that there is a great potential to use this biopolymer as a resource for developing high performance bio-inspired flame retardant materials and contribute to a circular economy

  • Flame retardant property of flax fabrics coated by extracellular polymeric substances recovered from both activated sludge and aerobic granular sludge
    'Elsevier BV', 2020
    Co-Authors: Kim, Nam Kyeun, Mao Ningtao, Lin Richard, Bhattacharyya Debes, Van Loosdrecht, Mark C.m., Lin Y
    Abstract:

    In this research, extracellular polymeric substances (EPS), such as EPSflocs and EPSgranules, were successfully extracted from activated and aerobic granular sludge, respectively, and tested as bio-based flame retardant materials. Flax fabric was coated by the biopolymeric substances and its flammability was evaluated based on a vertical burning test defined in US Federal Aviation Regulation. Both EPSflocs and EPSgranules coated flax fabrics achieved the self-extinguishment due to effective char formation. In particular, the result of the EPSgranules coated sample met the Aviation requirements for the aircraft interior. Moreover, the presence of carbonated hydroxyapatite was identified in EPSgranules char residue by using FTIR and XRD analysis. It can contribute to the self-extinguishing property of the fabric by enhancing char formation. Thermogravimetric analysis also demonstrated that EPSgranules coated flax was able to produce greater amount of char residue and its decomposition rate was significantly reduced. This research indicates that there is a great potential to use this biopolymer as a resource for developing high performance bio-inspired flame retardant materials and contribute to a circular economy.BT/Environmental BiotechnologyEnvironmental Fluid Mechanic

Zuyong Chen - One of the best experts on this subject based on the ideXlab platform.

  • experiment and numerical simulation of a full scale helicopter composite cockpit structure subject to a bird strike
    Composite Structures, 2016
    Co-Authors: Bin Song, Dongfang Wang, Zuyong Chen
    Abstract:

    Abstract Bird strike is one of the most critical safety issues in Aviation, which usually leads to catastrophic casualties. In this paper, an effective FE–SPH coupling model is developed to investigate the structure crashworthiness performance of a helicopter composite cockpit (HCC) subject to a bird strike by using an explicit nonlinear finite element code ANSYS/LS-DYNA 3D. The mechanical parameters of the bird constitutive model are obtained by a bird strike test on flat plate and the validated bird model is subsequently implemented to simulate a bird striking on HCC according to Federal Aviation Regulation 29.631. A full-scale HCC bird strike experiment is also performed under the same impact condition to certify airworthiness requirement as well as validate the FE model. The high agreement between the experiment and numerical analysis builds confidence in future use of FE method as a predictive tool. Based on numerical results, a structure design modification is also performed to enhance the structure stiffness and improve bird strike resistance.

Walvekar Vinayak - One of the best experts on this subject based on the ideXlab platform.

  • Birdstrike analysis on leading edge of an aircraft wing using a smooth particle hydrodynamics bird model
    American Society of Mechanical Engineers, 2012
    Co-Authors: Walvekar Vinayak, Thorbole, Chandrashekhar K., Bhonge, Prasannakumar S., Lankarani, Hamid M.
    Abstract:

    Click on the DOI link to access the article (may not be free).With the increase in air travel, the recent occurrences of birdstrikes on aircraft pose a major threat to human life; hence, there is a need to develop aircraft structures with a high resistance to such occurrences. According to the Federal Aviation Regulation (FAR 25.571) on Damage-Tolerance and Fatigue Evaluation of Structure (Amdt. 25-96), an airplane must be capable of successfully completing a flight during which likely structural damage might occur as a result of impact with a four-pound (1.8 kg) bird at sea-level cruise velocity or 0.85 percent of cruise velocity at 8,000 feet (2,400 m). Since the actual physical testing of a birdstrike is expensive, time-consuming, and cumbersome, this paper presents a methodology, based on the use of analytical finite element modeling and analysis, to certify an aircraft for a birdstrike. In actual physical testing for birdstrikes the mass of the bird might not be accurate and hence for certification purpose the computational modelling technique is more accurate and standardizes the certification procedure. The modeling and simulations are carried out as follows: the bird is modeled using the smooth particle hydrodynamics (SPH) technique in the LS-Dyna nonlinear finite element code. To validate this model, birdstrikes are carried out on rigid and deformable plates. The results, including displacement, Von-Mises stresses, forces, impulse, squash time and rise time, are obtained from the simulation, and non-dimensional values are plotted and compared with results from the test data. The detailed CAD geometry of the leading edge of an aircraft is modeled in CATIA V5. Meshing, connections, and material properties are then defined in the Altair Hypermesh 9.0 program. The results obtained from the birdstrike simulations on this leading edge are compared to data from the experiments, and the process is validated. Parametric studies are carried out by designing the aircraft leading edge for different values of nose radius and by assigning appropriate thickness values for leading-edge components and impacting the SPH-modeled bird at different velocities. The methodology and results obtained from simulation can be utilized in the initial design stages as well as for “certification by analysis” of an aircraft for birdstrike requirements as per Federal Regulations

  • Birdstrike analysis on leading edge of an aircraft wing using a smooth particle hydrodynamics bird model
    Wichita State University, 2010
    Co-Authors: Walvekar Vinayak
    Abstract:

    Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering.Birdstrikes on aircraft pose a major threat to human life and there is a need to devolop structures which have high resistance towards these structures. According to the Federal Aviation Regulation (FAR 25.571) on Damage-tolerance and fatigue evaluation of structure (Amdt.25-96), an airplane must be capable of successfully completing the flight during which likely structural damage might occur as a result of impact with 4-lb bird at cruise velocity at sea level or 0.85 cruise velocity at 8000 feet. The aim of the research is to develop a methodology which can be utilized to certify an aircraft for birdstrike using computational techniques since the physical testing of birdstrike is expensive, time consuming, cumbersome and for sanitary purpose. The simulations are carried out in the LS Dyna, non-linear finite element analysis code, in which the bird is modeled using the Smooth Particle Hydrodynamics (SPH) technique. Initially to validate the bird model in the LS Dyna, the birdstrike is carried out on rigid and deformable plates. The results including displacement, Von-Mises stresses, forces, impulse, squash time and rise time are obtained from the simulation. Then the non-dimensional plots of force, impulse and rise time are plotted and compared with results from experimental test data. The detailed CAD geometry of the leading edge is modeled in CATIA V5. Meshing, connections and material properties are then defined in the Altair Hypermesh 9.0. The validated SPH bird model is impacted at the leading edge. The results obtained from the simulation are compared with the data from the experiments, and the process is validated. The parametric studies are carried out by designing the leading edge for different values of nose radius and by vii assigning appropriate thickness values for leading edge components. Then the SPH bird model is impacted at varying impact velocites and results are compared with test data. It is proposed that the results obtained from simulation can be utilized in the initial design stages as well as for certification of an aircraft for birdstrike requirements as per Federal Regulations

Bin Song - One of the best experts on this subject based on the ideXlab platform.

  • experiment and numerical simulation of a full scale helicopter composite cockpit structure subject to a bird strike
    Composite Structures, 2016
    Co-Authors: Bin Song, Dongfang Wang, Zuyong Chen
    Abstract:

    Abstract Bird strike is one of the most critical safety issues in Aviation, which usually leads to catastrophic casualties. In this paper, an effective FE–SPH coupling model is developed to investigate the structure crashworthiness performance of a helicopter composite cockpit (HCC) subject to a bird strike by using an explicit nonlinear finite element code ANSYS/LS-DYNA 3D. The mechanical parameters of the bird constitutive model are obtained by a bird strike test on flat plate and the validated bird model is subsequently implemented to simulate a bird striking on HCC according to Federal Aviation Regulation 29.631. A full-scale HCC bird strike experiment is also performed under the same impact condition to certify airworthiness requirement as well as validate the FE model. The high agreement between the experiment and numerical analysis builds confidence in future use of FE method as a predictive tool. Based on numerical results, a structure design modification is also performed to enhance the structure stiffness and improve bird strike resistance.

Thomas R. Weitzel - One of the best experts on this subject based on the ideXlab platform.

  • jaaer/vol3/iss1/2 A TURNING POINT IN Aviation TRAINING: THE AQP MANDATES CREW RESOURCE MANAGEMENT AND LINE OPERATIONAL SIMULATIONS
    2016
    Co-Authors: Thomas R. Weitzel, Henry Lehrer Ph. R. D, Henry R. Lehrer, Ph. D
    Abstract:

    Crew Resource Management (CRM) and Line Oriented Flight Training (LOFT) have not been mandatory elements ofair carrier flight crew training. Additionally, Full-Flight Simulation and Flight Training Devices (FTDs) have been tools utilized to various degrees by the different air carrier training departments. Each air carrier's training program has traditionally been approved by its Federal Aviation Administration (FAA) Principal Operations Inspector (POI). The Advanced Qualification Program (AQP) is an alternative method of training air carrier flight crewmembers and will be a voluntaryprogram applicable to airline certificate holders under the Code ofFederalRegulations Section 14 (14 CFR--encompasses aeronautics and space) Parts 121 and 135. The FAA has facilitated the implementation ofAQPs with the issuance ofa Special Federal Aviation Regulation (SFAR 58), rather than rewriting the numerous Federal Aviation Regulations (FARs) which detail air camer training. Additionally, an Air Carrier Training Branch (AFS-210) has been established to administer AQPs, with quality control being developed by a human factors specialist. Mandatory CRM training and the utilization ofLin