Search

Copyright of Journal of Donghua University (Natural Science Edition) is the property of Journal of Donghua University (Natural Science) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Cotton Textile Technology is the property of Cotton Textile Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

At present, the numerical methods are lack seriously which are used for the electromagnetic coupling analysis of electronic device with penetrated wire. Therefore, an efficient time domain hybrid method is presented consisting of finite difference time domain (FDTD) method, transmission line (TL) equations and Norton theory to solve the electromagnetic coupling problem of electronic device with penetrated wire. In this method, the penetrated wire of electronic device is divided into external and internal transmission lines according to the shielded enclosure of device firstly. Then, the FDTD method combined with the TL equations is used to build the electromagnetic coupling models of external and internal transmission lines and obtain the transient responses on the lines, respectively. Finally, the equivalent circuit model of the penetrated wire is established by the Norton theory, which can solve the impedance mismatch between external and internal transmission lines, and achieve the transmission of interference signals on the penetrated wire. The accuracy and efficiency of the presented method are verified via the numerical simulations of electromagnetic coupling of the penetrated wire in the free space and shielded cavity by comparing with the traditional FDTD method. [ABSTRACT FROM AUTHOR]

Copyright of Cotton Textile Technology is the property of Cotton Textile Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The dynamic responses of projectile-borne electronic devices which are protected by encapsulating material under impact loading are studied through numerical simulation. A LS-DYNA user defined material subroutine is established according to the ZWT nonlinear viscoelastic model which is used for simulating the dynamic response of the encapsulating material in the projectile. The simulations of projectile penetration were performed by adjusting the controllable parameters of ZWT model, such as nonlinear elasticity modulus, low strain rate Maxwell elastic constant, high strain rate Maxwell elastic constant, high strain rate Maxwell relaxation time and material density. Thus the dynamic responses of projectile-borne electronic devices could be obtained from the numerical results. The research results show that the shock absorption and protection effects of the encapsulating materials are better when the values of nonlinear elasticity modulus, low strain rate Maxwell elastic constant, high strain rate Maxwell relaxation time and material density are decreased. [ABSTRACT FROM AUTHOR]