The Experts below are selected from a list of 144 Experts worldwide ranked by ideXlab platform

David G Wilso - One of the best experts on this subject based on the ideXlab platform.

  • hamiltonian methods of modeling and control of ac microgrids with Spinning Machines and inverters
    International Journal of Electrical Power & Energy Systems, 2018
    Co-Authors: Ronald C Matthews, Wayne W Weave, Rush D Robine, David G Wilso
    Abstract:

    Abstract This paper presents a novel approach to the modeling and control of AC microgrids that contain Spinning Machines, power electronic inverters and energy storage devices. The inverters in the system can adjust their frequencies and power angles very quickly, so the modeling focuses on establishing a common reference frequency and angle in the microgrid based on the Spinning Machines. From this dynamic model, nonlinear Hamiltonian surface shaping and power flow control method is applied and shown to stabilize. From this approach the energy flow in the system is used to show the energy storage device requirements and limitations for the system. This paper first describes the model for a single bus AC microgrid with a Hamiltonian control, then extends this model and control to a more general class of multiple bus AC microgrids. Simulation results demonstrate the efficacy of the approach in stabilizing and optimization of the microgrid.

  • hamiltonian modeling and control of ac microgrids with Spinning Machines and inverters
    International Symposium on Power Electronics Electrical Drives Automation and Motion, 2016
    Co-Authors: Wayne W Weave, Rush D Robine, Gordo G Parke, David G Wilso
    Abstract:

    This paper presents a novel approach to the modeling and control of AC microgrids that contain Spinning Machines, power electronic inverters and energy storage devices. The inverters in the system can adjust their frequencies and power angles very quickly, so the modeling focuses on establishing a common references frequency and angle in the microgrid based on the Spinning Machines. From this dynamic model, nonlinear Hamiltonians surface shaping power flow control method is applied and shown to stabilize. From this approach the energy flow in the system is used to show the energy storage device requirements and limitations for the system. The modeling and control approach presented in this paper enables a unified, stable response to system disturbances, thus increasing resiliency. This paper first describes the dynamic model for a AC microgrid used for the controls development. Then a Hamiltonian energy based control is developed and shown to be stable and robust. A simulation example demonstrate the efficacy of the approach in stabilizing and optimization of the AC microgrid.

Malek Alshuku - One of the best experts on this subject based on the ideXlab platform.

  • experimental study on the Spinning geometry of multi thread fancy yarn on hollow spindle Spinning Machines part i
    International Journal of Clothing Science and Technology, 2018
    Co-Authors: Malek Alshuku, Daniil Yurchenko
    Abstract:

    Purpose The purpose of this paper is to define the relationships between the first Spinning zone of the hollow-spindle Spinning system and technological parameters of manufacturing multi-thread fancy yarn. Design/methodology/approach A simple mathematical equation was introduced to account for the effect-thread helices. The validity of this equation was tested using visual observations of the helices of the effect thread in terms of their number, width and regularity and then compared against the theoretical values. Findings It was found that higher overfeed ratios increased the diameter of the helices without affecting their number, while increasing the rotational speed increased their number but reduced their diameter. The effect of these changes on the fancy yarns was that higher number of helices resulted in more fancy profiles while wider helices resulted in larger fancy profiles. Originality/value This research offers fancy yarn manufacturers a better understanding of the manufacturing process of fancy yarn and its practical advantage is to help them in determining the type of the resultant fancy yarns by controlling the geometry of the first Spinning zone.

  • role of false twist in the manufacturing process of multi thread fancy yarn on hollow spindle Spinning Machines
    Journal of The Textile Institute, 2014
    Co-Authors: Malek Alshuku, Alexande Fotheringham
    Abstract:

    A false twist hook is currently used in hollow spindle Spinning Machines to facilitate the manufacturing processes of several textile products. A study was conducted to investigate its effect on the production of gimp yarns and overfed fancy yarns which have multi-thread structures made in a one-stage process on hollow spindle Machines. These fancy yarns were compared with their counterparts produced without using the false-twist hook. Significant differences were reported between these two groups of fancy yarn regarding extension at the first break, load at the first break and extension at the breakage point of the effect component. The size of the effect profiles and the number of the fancy profiles were smaller when false twist was used. The results confirmed the highly wavy and sigmodial structure of the fancy yarns made by using the false twist hook over a wide range of overfeed ratios.

Daniil Yurchenko - One of the best experts on this subject based on the ideXlab platform.

  • experimental study on the Spinning geometry of multi thread fancy yarn on hollow spindle Spinning Machines part i
    International Journal of Clothing Science and Technology, 2018
    Co-Authors: Malek Alshuku, Daniil Yurchenko
    Abstract:

    Purpose The purpose of this paper is to define the relationships between the first Spinning zone of the hollow-spindle Spinning system and technological parameters of manufacturing multi-thread fancy yarn. Design/methodology/approach A simple mathematical equation was introduced to account for the effect-thread helices. The validity of this equation was tested using visual observations of the helices of the effect thread in terms of their number, width and regularity and then compared against the theoretical values. Findings It was found that higher overfeed ratios increased the diameter of the helices without affecting their number, while increasing the rotational speed increased their number but reduced their diameter. The effect of these changes on the fancy yarns was that higher number of helices resulted in more fancy profiles while wider helices resulted in larger fancy profiles. Originality/value This research offers fancy yarn manufacturers a better understanding of the manufacturing process of fancy yarn and its practical advantage is to help them in determining the type of the resultant fancy yarns by controlling the geometry of the first Spinning zone.

M A Ramada - One of the best experts on this subject based on the ideXlab platform.

  • comparison between physical properties of ring spun yarn and compact yarns spun from different pneumatic compacting systems
    Indian Journal of Fibre & Textile Research (IJFTR), 2015
    Co-Authors: Alsaid Ahmed Almetwally, M M Mourad, A Hebeish, M A Ramada
    Abstract:

    A comparative study pertaining to physical and mechanical properties of ring-spun yarn vis-a-vis compact yarns spun using three different compacting systems has been reported. Rieter (K-44), Toyota (RX-240) and Suessen (Fiomax) Spinning Machines have been used and the condensing process of the fibres in the yarn cross-section as per these compact Spinning systems is accomplished pneumatically. Thus, a yarn of linear density 5.9 tex (100 Ne) is spun on the Spinning systems using Egyptian cotton of the type Giza 86. One way Anova together with least significant difference are employed to feature the means of the properties of spun yarns and a significant difference among them is observed. According to the performed statistical analysis, there is a significant difference between ring - spun yarn properties and each of the pnuematic compact spun yarns. These compact-spun yarns are also found to differ significantly in terms of their physical and mechanical properties; however, they are all found superior to the ring-spun yarn.

R A Platfoo - One of the best experts on this subject based on the ideXlab platform.

  • computational two phase air fiber flow within transfer channels of rotor Spinning Machines
    Textile Research Journal, 1997
    Co-Authors: Lingxue Kong, R A Platfoo
    Abstract:

    The pneumatic conveyance of fibers within confined channels is particularly relevant to textile engineering, with applications such as transporting individual fibers within rotor Spinning Machines. The channels of converging shape within these Machines are designed to help straighten the orientation of the fibers that have escaped from the opening roller. This allows a satisfactory configuration of fibers to be presented to the Spinning rotor surface, which in turn improves yarn and subsequent fabric properties. In this study, a new air/fiber two-phase model is developed to simulate fiber movement within confined channels. The computation is based on the results from single-phase air flow simulations in a one-way coupling Lagrangian strategy for predicting fiber trajectories. Initial fiber position and the underlying air flow pattern are demonstrated to be critical to the final fiber configuration at the exit of the channel. A streamwise straight fiber tends to generate a leading hook, while a cross fiber...

  • two dimensional simulation of air flow in the transfer channel of open end rotor Spinning Machines
    Textile Research Journal, 1996
    Co-Authors: Lingxue Kong, R A Platfoo
    Abstract:

    A two-dimensional computational fluid dynamics model is developed to simulate the flow patterns inside the transportation zone of a rotor Spinning machine and analyze their effects on yarn properti...