The Experts below are selected from a list of 2799 Experts worldwide ranked by ideXlab platform

Nobuyoshi Masuzawa - One of the best experts on this subject based on the ideXlab platform.

  • Relationship between Horn Pressure and Welding Time in Ultrasonic Welding of Plastic Pipes Using Torsional Vibration
    Japanese Journal of Applied Physics, 1999
    Co-Authors: Kenichi Suga, Etsuzo Ohdaira, Nobuyoshi Masuzawa
    Abstract:

    Application of ultrasonic welding to Plastics has become common. Recently, an ultrasonic welding method for long Plastic Pipes using torsional vibrations was developed. Optimal welding conditions for this new method have not yet been clarified. This paper reports the results of an investigation made in order to clarify the conditions, focusing on the welding time and both horn pressure, static force that horns pinch pipe, and static pressure which is added to welding surface. Experiments were performed on the welding of acrylic resin and ABS resin Pipes. It was found that welding time decreases exponentially with increasing horn pressure and that increasing the static pressure reduces the welding time. It was also found there is an optimum range of horn pressures.

  • Ultrasonic Welding of Plastic Pipes Using Torsional Vibration
    Japanese Journal of Applied Physics, 1998
    Co-Authors: Nobuyoshi Masuzawa, Kiichi Hori
    Abstract:

    In recent years, the application of ultrasonic welding to Plastics has become common. In this paper a method for ultrasonic welding of Plastic Pipes using torsional vibrations is reported. In this method torsional vibrations are applied to the welding pipe from the circumferential direction with horns placed near the welding surface. Static pressure is independently applied from the vibrations to the welding surface. It was observed that acrylic resin Pipes could be effectively welded by the proposed method.

T. Hao - One of the best experts on this subject based on the ideXlab platform.

  • Efficient Detection of Buried Plastic Pipes by Combining GPR and Electric Field Methods
    IEEE Transactions on Geoscience and Remote Sensing, 2019
    Co-Authors: Xiren Zhou, Huanhuan Chen, T. Hao
    Abstract:

    In this paper, an efficient Plastic pipe detecting model is proposed, which combines the ground penetrating radar (GPR) and the electric field method. The model consists of the electric field locating model (EFLM) and the GPR B-scan image interpreting (GBII) model. Synchronized electric field and GPR data are collected through a data acquisition device dedicatedly designed for the swift and accurate estimation of buried Plastic Pipes. The EFLM estimates the approximate locations of underground Plastic Pipes from the electric field data quickly, separates a GPR B-scan image into segments, keeps the segments that might contain hyperbolas, and discards the irrelevant ones. Then, the GBII model interprets the depth and radius of the buried pipe in the kept segments. Our numerical simulations and experiments prove that by utilizing the EFLM, the 1-D electric field data could be processed quickly and the GPR B-scan image could be segmented with part of irrelevant pixels discarded, while hyperbolas in the kept image segments could be automatically and accurately fitted. With our proposed model, the depth and radius of the buried Pipes could be efficiently obtained.

  • Time-frequency analysis of enhanced GPR detection of RF tagged buried Plastic Pipes
    NDT and E International, 2017
    Co-Authors: W.y. Zhang, T. Hao, Y Chang, Y. H. Zhao
    Abstract:

    Ground Penetrating Radar (GPR) is a well-received non-destructive technique for the detection of underground utilities, such as water/gas Pipes, sewers, power cables, and telecommunication ducts. However, radar signatures of Plastic Pipes are generally weak when the surrounding soils are attenuative and/or the pipe and soils have similar electromagnetic characteristics. In order to increase the radar visibility of these Pipes, attaching Radio-Frequency (RF) tags to them is a useful method. In this paper we designed two types of Bowtie-Omega shaped RF tags. The finite element method (FEM) simulation and measurement of the designed tags show strong resonances in the GPR spectrum, and by conducting GPR B-scans stronger radar signatures are observed when the RF tags are buried in our 2.0×1.5×0.75 m tank filled with dry sand. Furthermore, we implement a simple processing procedure based on Short-time Fourier Transform (STFT), by which strong time-frequency domain response of the tags is clearly seen at those designed resonant frequencies, and disappear when tags are not inserted. The resulting detection of the hollow Plastic pipe in both time and frequency domains due to the co-located tag is evidently enhanced.

Zhang Xue-dong - One of the best experts on this subject based on the ideXlab platform.

  • Design and research of single-effect lithium bromide-water absorption chillers using Plastic Pipes
    Energy Conservation Technology, 2020
    Co-Authors: Zhang Xue-dong
    Abstract:

    There were extensive applications of lithium bromide-water absorption chillers in industry,but the heat exchanger corrosion and refrigerating capacity loss were very difficult to be solved.In our research,the problem was solved by using Plastic heat transfer Pipes instead of copper Pipes.The Plastic heat exchangers and lithium bromide-water absorption chillers using Plastic Pipes were designed.The heat transfer Pipes of Plastic heat exchangers were polytetrafluoroethylene(PTFE)Pipes.The disposal of heat transfer Pipes was Archimedean spiral Pipes.In addition,the contrast of theoretical heat transfer coefficient and experimental heat transfer coefficient was analyzed.The result shows that the absorber using PTFE Pipes instead of traditional metal Pipes can be most use value in lithium bromide-water absorption chillers.

  • Analysis of Heat Transfer Performance and Design of Single-effect Lithium Bromide-water Absorption Chillers Using Plastic Pipes
    Advanced Materials Research, 2020
    Co-Authors: Zhang Xue-dong
    Abstract:

    There are extensive applications of lithium bromide-water absorption chillers in industry,but the heat exchanger corrosion and refrigerating capacity loss are very difficult to be solved.In our research,the problem was solved by using Plastic heat transfer Pipes instead of copper Pipes.The Plastic heat exchangers and lithium bromide-water absorption chillers using Plastic Pipes were designed.The heat transfer Pipes of Plastic heat exchangers were poly tetra fluoro ethylene(PTFE) Pipes.And the disposal of heat transfer Pipes was Archimedean spiral Pipes.In addition,the heat transfer performance of Plastic heat exchangers was analyzed.The result shows that the absorber using PTFE Pipes instead of traditional metal Pipes can be most use value in lithium bromide-water absorption chillers.

  • Theoretical and Experimental Research of Single-effect Lithium Bromide-water Absorption Chillers Using Plastic Pipes
    2020
    Co-Authors: Zhang Xue-dong
    Abstract:

    There are extensive applications of lithium bromide-water absorption chillers in industry,but the heat exchanger corrosion and refrigerating capacity loss are very difficult to be solved.In our research,the problem was solved by using Plastic heat transfer Pipes instead of copper Pipes.Theoretical circulation of single-effect lithium bromide-water absorption chillers using Plastic Pipes was analyzed.Thermal calculation and heat transfer calculation were made for single-effect lithium bromide-water absorption chillers using Plastic Pipes.The experimental facility of lithium bromide-water absorption chillers using Plastic Pipes was designed.And these are reference for the performance testing of single-effect lithium bromide-water absorption chillers using Plastic Pipes.

  • Theoretical research of single-effect lithium bromide-water absorption chillers using Plastic Pipes
    Energy Conservation Technology, 2020
    Co-Authors: Zhang Xue-dong
    Abstract:

    The problem was solved by using Plastic heat transfer Pipesinstead of copper Pipes.Theoretical circulation of single-effect lithiumbromide-water absorption chillers using Plastic Pipes was analyzed.Thermal calculation and heat transfer calculation were made for single-effect lithium bromide-water absorption chillers using Plastic Pipes.Andthese were theoretical basis for the structural design and experimental re-search of single-effect lithium bromide-water absorption chillers usingPlastic Pipes.

J. E. Van Zyl - One of the best experts on this subject based on the ideXlab platform.

  • Numerical Investigation of the Influence of Viscoelastic Deformation on the Pressure-Leakage Behavior of Plastic Pipes
    Journal of Hydraulic Engineering, 2015
    Co-Authors: E. N. Ssozi, B. D. Reddy, J. E. Van Zyl
    Abstract:

    AbstractIt has been well established that leakage from Pipes is more sensitive to changes in pressure than the square root relationship predicted by the orifice equation. The main reason for this is that leak areas are not static, but vary with changes in system pressure. While previous studies have shown that the leak area is a linear function of pressure for elastic materials, the effect of the viscoelastic behavior of Plastic Pipes on the pressure-leakage response is not yet well understood. In this study, finite element analysis was used to investigate the effect of viscoelastic behavior on round holes and longitudinal cracks in both high density polyethylene (HDPE) and polyvinylchloride (PVC) Pipes. The standard differential equation for linear viscoelastic deformation was then calibrated to the finite element results, resulting in equations that accurately describe the viscoelastic variation in leak areas as functions of time. The results also showed that the time-dependent behaviors of both pipe ma...

  • The Behavior of Leaks in Plastic Pipes Displaying Viscoelastic Deformation
    2015
    Co-Authors: E. N. Ssozi, B. D. Reddy, J. E. Van Zyl
    Abstract:

    It has been well established that leakage from Pipes is more sensitive to changes in pressure than the square root relationship predicted by the orifice equation. The main reason for this is that leak areas are not static, but vary with changes in pressure. While previous studies have shown that the leak area is a linear function of pressure for elastic materials, the impact of the viscoelastic behavior of Plastic Pipes on the pressure-leakage response has not been quantified. In this study, Finite Element Analysis was used to investigate the effect of viscoelastic behavior on round holes and longitudinal cracks in HDPE and PVC Pipes. The results showed that the viscoelastic deformation stabilizes after about 12 hours. The leak area was found to be a linear function of pressure at any time during the viscoelastic deformation process. This means that the leakage model developed for elastic deformation can be adapted to describe the development of leak flow over time in Pipes experiencing viscoelastic deformation.

Kiichi Hori - One of the best experts on this subject based on the ideXlab platform.

  • Ultrasonic Welding of Plastic Pipes Using Torsional Vibration
    Japanese Journal of Applied Physics, 1998
    Co-Authors: Nobuyoshi Masuzawa, Kiichi Hori
    Abstract:

    In recent years, the application of ultrasonic welding to Plastics has become common. In this paper a method for ultrasonic welding of Plastic Pipes using torsional vibrations is reported. In this method torsional vibrations are applied to the welding pipe from the circumferential direction with horns placed near the welding surface. Static pressure is independently applied from the vibrations to the welding surface. It was observed that acrylic resin Pipes could be effectively welded by the proposed method.