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Anefficient quadrature demodulator for medical ultrasound imaging
Hao ZHOU,Yin-fei ZHENG
《信息与电子工程前沿(英文)》 2015年 第16卷 第4期 页码 301-310 doi: 10.1631/FITEE.1400205
关键词: B-mode ultrasound imaging Color flow imaging Quadrature demodulation Finite impulse response filter
Digital Readout System for Micromachined Gyroscope and Analysis for its Demodulation Algorithm
ZHOU Bin, GAO Zhong-yu, CHEN Huai, ZHANG Rong, CHEN Zhi-yong
《机械工程前沿(英文)》 2006年 第1卷 第1期 页码 106-110 doi: 10.1007/s11465-005-0016-5
A new digital readout system for micromachined gyroscope has been proposed to implement flexible parameter adjustment, improve the control performance of gyroscope, and make error compensation. By digitalizing the output of the gyroscope, this system uses a floating-type digital signal processor (DSP) to process the signal demodulation and achieve the feedback control of the gyroscope. Therefore, the small change of capacitance in the micromachined gyroscope can be detected. A new demodulation algorithm of least mean square demodulation (LMSD) has been developed inside DSP. Simulation and measurement results show that LMSD can improve 29% of the noise performance compared with the typical multiplication method. In air pressure, a kind of vibration-wheel micromachined gyroscope has achieved a noise level of 0.0073 deg s-1z(z-1/2 over the 100-Hz bandwidth by using this digital readout technology.
关键词: demodulation algorithm vibration-wheel micromachined feedback flexible parameter pressure
李炎新,胡爱群,宋宇波
《中国工程科学》 2006年 第8卷 第5期 页码 49-51
提出了一种新型的基于自适应滤波算法的解调二进制相移键控(BPSK)信号的方法。以常用的最小均方误差自适应算法(LMS)为例,讨论了新型的BPSK自适应解调的过程及其性能。该解调算法不需要自适应滤波器完成收敛,从而降低了采样频率。给出的理论性能与仿真结果表明,BPSK自适应解调的误码率仿真结果与理论值吻合非常好;而且该方法具有抗干扰性能强、输出响应快、便于数字信号处理(DSP)技术实现等特点,在相同的采样频率下其误码率优于相关解调的误码率。
李春辉1,孙立军1,刘佳荣1,张扬1,李海洋2,王化祥1
《信息与电子工程前沿(英文)》 2021年 第22卷 第2期 页码 141-286 doi: 10.1631/FITEE.1900558
Analytical and numerical investigation into the longitudinal vibration of uniform nanotubes
null
《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 142-149 doi: 10.1007/s11465-014-0292-z
In recent years, prediction of the behaviors of micro and nanostructures is going to be a matter of increasing concern considering their developments and uses in various engineering fields. Since carbon nanotubes show the specific properties such as strength and special electrical behaviors, they have become the main subject in nanotechnology researches. On the grounds that the classical continuum theory cannot accurately predict the mechanical behavior of nanostructures, nonlocal elasticity theory is used to model the nanoscaled systems. In this paper, a nonlocal model for nanorods is developed, and it is used to model the carbon nanotubes with the aim of the investigating into their longitudinal vibration. Following the derivation of governing equation of nanorods and estimation of nondimensional frequencies, the effect of nonlocal parameter and the length of the nanotube on the obtained frequencies are studied. Furthermore, differential quadrature method, as a numerical solution technique, is used to study the effect of these parameters on estimated frequencies for both classical and nonlocal theories.
关键词: continuum theory differential quadrature method nanorod longitudinal vibration
张庆礼,王晓梅,殷绍唐,江海河
《中国工程科学》 2008年 第10卷 第2期 页码 35-40
在工程数值计算、X射线衍射线形分析、光谱学等领域常使用高斯数值积分,高斯积分的节点及权重因子是数值积分的必须数据。研究了高次勒让德、拉盖尔和厄米多项式的零 点,即高斯-勒让德、高斯-拉盖尔、高斯-厄米积分的节点的计算方法,给出了一种有效的高精度数值算法——搜索迭代方法(scan-iteration method,SIM)。根据勒让德、拉盖尔、厄米多项式的特点,对拉盖尔多项式、厄米多项式的定义稍做变化后,获得了计算多项 式值的稳定递推关系。求它们的根时,先在一定范围内以一定的步长搜索根所在的
Zude ZHOU, Desheng JIANG, Quan LIU
《机械工程前沿(英文)》 2009年 第4卷 第1期 页码 5-14 doi: 10.1007/s11465-009-0011-3
关键词: fiber Bragg grating sensor (FBGS) mechanical equipment operation safety embedded technology high-speed demodulation digital monitoring health diagnosis
Velocity gradient elasticity for nonlinear vibration of carbon nanotube resonators
Hamid M. SEDIGHI, Hassen M. OUAKAD
《结构与土木工程前沿(英文)》 2020年 第14卷 第6期 页码 1520-1530 doi: 10.1007/s11709-020-0672-x
关键词: velocity gradient elasticity theory nanotube resonators differential-quadrature method nonlinear vibration
Anisotropy of multi-layered structure with sliding and bonded interlayer conditions
Lingyun YOU, Kezhen YAN, Jianhong MAN, Nengyuan LIU
《结构与土木工程前沿(英文)》 2020年 第14卷 第3期 页码 632-645 doi: 10.1007/s11709-020-0617-4
关键词: multi-layered structure Hankel transformation anisotropic transversely isotropic interlayer condition Gauss-Legendre quadrature
史小红
《中国工程科学》 2012年 第14卷 第3期 页码 108-112
提出了一种采用双正交复序列的高效扩频调制与解调方法(DoCS)。输入数据比特流被分割为长度为M的组,每组的M比特作为输入码字,从2M-2个长度为L的DoCS序列中选择一条序列进行发送,被选中的序列以QPSK方式调制在载波上,实现扩频通信。文中还提出了一种前向相位校正(FPC)方法来解决该系统中收发两端的载波同步问题。
OFDM直接变频接收机中通用的I/Q不平衡估计与补偿方法 None
Fang-lin GU, Shan WANG, Wen-wu WANG
《信息与电子工程前沿(英文)》 2018年 第19卷 第3期 页码 388-397 doi: 10.1631/FITEE.1700003
标题 作者 时间 类型 操作
Digital Readout System for Micromachined Gyroscope and Analysis for its Demodulation Algorithm
ZHOU Bin, GAO Zhong-yu, CHEN Huai, ZHANG Rong, CHEN Zhi-yong
期刊论文
Analytical and numerical investigation into the longitudinal vibration of uniform nanotubes
null
期刊论文
Digital monitoring and health diagnosis for mechanical equipment operation safety based on fiber Bragg grating sensor
Zude ZHOU, Desheng JIANG, Quan LIU
期刊论文
Velocity gradient elasticity for nonlinear vibration of carbon nanotube resonators
Hamid M. SEDIGHI, Hassen M. OUAKAD
期刊论文
Anisotropy of multi-layered structure with sliding and bonded interlayer conditions
Lingyun YOU, Kezhen YAN, Jianhong MAN, Nengyuan LIU
期刊论文