针对利用感应耦合电能传输(inductively coupled power transfer,ICPT)系统电能传输通道实现数字信号实时、双向传输问题,提出一种基于载波方式实现信号传输的新方法。电能传输耦合机构作为电能与信号传输的共享通道,可以传输电能与信...针对利用感应耦合电能传输(inductively coupled power transfer,ICPT)系统电能传输通道实现数字信号实时、双向传输问题,提出一种基于载波方式实现信号传输的新方法。电能传输耦合机构作为电能与信号传输的共享通道,可以传输电能与信号这两种不同频率的波。信号加载和检波电路直接并联在电能传输耦合机构上,并在电能传输谐振电容与耦合机构间串联阻波电路,数字信号经调制后加载到传输通道,然后直接经过电能传输耦合机构传输,避免通过电能传输谐振电容而被削弱。通过分析电能传输及信号传输通道的衰减增益,以及电能传输对信号传输的干扰,确定所提方法的可行性,最后搭建实验平台验证所提方法的正确性。展开更多
Mantle conductivity imaging is one of the scientific goals of the forthcoming Macao Science Satellite-1(MSS-1).To achieve this goal,we develop a data analysis and inversion scheme for satellite magnetic data to probe ...Mantle conductivity imaging is one of the scientific goals of the forthcoming Macao Science Satellite-1(MSS-1).To achieve this goal,we develop a data analysis and inversion scheme for satellite magnetic data to probe global one-dimensional(1D)mantle conductivity structures.Using this scheme,we present a new global mantle conductivity model by analyzing over 8 years of Swarm satellite magnetic data.First,after sophisticated data selection procedures and the removal of core and crustal fields,the inducing and induced spherical harmonic coefficients of magnetic potential due to the magnetospheric ring current are derived.Second,satellite Cresponses are estimated from the time series of these coefficients.Finally,the observed responses are inverted for both smooth and threejump conductivity models using a quasi-Newton algorithm.The obtained conductivity models are in general agreement with previous global mantle conductivity models.A comparison of our conductivity model with the laboratory conductivity model suggests the mean state of the upper mantle and transition zone is relatively dry.This scheme can be used to process the forthcoming Macao Science Satellite-1 magnetic data.展开更多
In the production of hot extrusion pipes, the billet will be heated in an induction furnace, before piercing or extrusion,to a certain temperature. The induction heating temperature field profile in the billet will ex...In the production of hot extrusion pipes, the billet will be heated in an induction furnace, before piercing or extrusion,to a certain temperature. The induction heating temperature field profile in the billet will exert an influence on the deformation processes. The study has developed an data conversion program to convert the temperature data from induction heating by ANSYS to deformation simulation software DEFORM; therefore, not only the relatively accurate temperature field can be made available, compared with the usually assumed uniform temperature field, but also the connection between induction heating and deformation can be established, which is essential to evaluate the processing parameters. Numerical simulation of the piercing processes of different temperature fields by induction heating was carded out, and the results have shown that the different initial temperature fields in the billet can lead to different deformation curves, which indicates that the conversion program is necessary to study the production process of hot extrusion pipes.展开更多
文摘针对利用感应耦合电能传输(inductively coupled power transfer,ICPT)系统电能传输通道实现数字信号实时、双向传输问题,提出一种基于载波方式实现信号传输的新方法。电能传输耦合机构作为电能与信号传输的共享通道,可以传输电能与信号这两种不同频率的波。信号加载和检波电路直接并联在电能传输耦合机构上,并在电能传输谐振电容与耦合机构间串联阻波电路,数字信号经调制后加载到传输通道,然后直接经过电能传输耦合机构传输,避免通过电能传输谐振电容而被削弱。通过分析电能传输及信号传输通道的衰减增益,以及电能传输对信号传输的干扰,确定所提方法的可行性,最后搭建实验平台验证所提方法的正确性。
基金financially supported by the National Natural Science Foundation of China(41922027,41830107,42142034,41874086)Innovation-Driven Project of Central South University(2020CX012)+4 种基金Macao FoundationMacao Science and Technology Development Fund(0001/2019/A1)the Pre-research Project on Civil Aerospace Technologies funded by China National Space Administration(D020303)the Hunan Provincial Innovation Foundation for Postgraduate(CX20210277)the Fundamental Research Funds for the Central Universities of Central South University(2021zzts0259)。
文摘Mantle conductivity imaging is one of the scientific goals of the forthcoming Macao Science Satellite-1(MSS-1).To achieve this goal,we develop a data analysis and inversion scheme for satellite magnetic data to probe global one-dimensional(1D)mantle conductivity structures.Using this scheme,we present a new global mantle conductivity model by analyzing over 8 years of Swarm satellite magnetic data.First,after sophisticated data selection procedures and the removal of core and crustal fields,the inducing and induced spherical harmonic coefficients of magnetic potential due to the magnetospheric ring current are derived.Second,satellite Cresponses are estimated from the time series of these coefficients.Finally,the observed responses are inverted for both smooth and threejump conductivity models using a quasi-Newton algorithm.The obtained conductivity models are in general agreement with previous global mantle conductivity models.A comparison of our conductivity model with the laboratory conductivity model suggests the mean state of the upper mantle and transition zone is relatively dry.This scheme can be used to process the forthcoming Macao Science Satellite-1 magnetic data.
文摘In the production of hot extrusion pipes, the billet will be heated in an induction furnace, before piercing or extrusion,to a certain temperature. The induction heating temperature field profile in the billet will exert an influence on the deformation processes. The study has developed an data conversion program to convert the temperature data from induction heating by ANSYS to deformation simulation software DEFORM; therefore, not only the relatively accurate temperature field can be made available, compared with the usually assumed uniform temperature field, but also the connection between induction heating and deformation can be established, which is essential to evaluate the processing parameters. Numerical simulation of the piercing processes of different temperature fields by induction heating was carded out, and the results have shown that the different initial temperature fields in the billet can lead to different deformation curves, which indicates that the conversion program is necessary to study the production process of hot extrusion pipes.
