基于FPGA和DSP的激光陀螺信号处理电路设计

研究机械抖动激光陀螺的信号读出系统,设计激光陀螺的信号处理电路。光电转换后的微弱电流信号经过前置放大电路转化为电压方波信号,在FPGA中进行鉴相解调以及可逆计数,最后由DSP实现机抖偏频解噪和低通数字滤波。与激光陀螺联合测试并将结果输出至上位机,结果表明设计的电路实现了对激光陀螺输出信号的有效采集,满足激光陀螺功能测试的需要。     

一种GSM接收机设计与实现

介绍一种GSM接收机设计与实现方案,该设计中采用AD9445实现GSM信号的模数变换,将采集后数据送到FPGA和DSP中进行后续基带信号处理。给出系统总体设计,并对其中的主要电路设计进行详细阐述。由于该GSM接收机系统采用FPGA+DSP结构,因此系统具有较强的设计灵活性和较高的实用价值。     

基于DSP的测控系统设计

描述了基于DSP(数字信号处理器)的测控系统各模块的硬件设计实现,设计了以TMS320F28335为核心,加外部模数转换器和内部捕获单元实现三轴陀螺,双轴加速度计5路信号的采集系统,结合GPS(全球定位系统)和无线传输模块的目标信息和实时位置信息,经DSP处理后输出PWM信号,再经光电隔离后实现对舵机的控制.试验结果表明:采用了TMS320F28335芯片后,不仅简化了系统外围设备,降低了系统的功耗,而且提高了系统的准确性和实时性.     

一种基于DSP的交流信号频率检测系统

本文设计了一种交流信号频率检测的系统。即通过对交流信号的采集,并借助DSP来实现对模拟交流信号进行和数据采集、运算、分析和处理。系统的硬件部分主要由DSP处理器、AD采样电路、信号调理电路以及液晶显示部分构成,软件部分主要是基于DSPTMS320VC33的C语言程序,包括系统的初始化、AD采样子程序、FFT运算程序等。本系统能够实现对交流信号在频域内精确的分析计算。最后利用液晶显示测试结果。     

基于DSP的给水泵运行状态在线监测系统

给水泵在运行过程中的振动信号及其特征信息对给水泵系统的状态监测有重要意义.给水泵运行状态在线监测系统以数字信号处理器DSP为核心,采用以振动监测为主、以过程量监测为辅的监测方法,通过对采集信号的频谱分析和数字处理,将其由USB高速接口送入上位机,由上位机的专家系统对给水泵进行状态判断和故障诊断.本文介绍了给水泵运行状态在线监测系统的工作原理,分析了有限冲击响应(FIR)数字滤波算法和快速傅立叶变换(FFT)算法的DSP实现方法,重点阐述了系统的总体设计、硬件设计和软件设计.     

基于FPGA的多DSP系统接口电路设计

针对多DSP(数字信号处理器)的数据传输有三种常用接口方式:EMIF,HPI和IdcBSP方式.而采用EMIF接口方式,利用FPCA(现场可编程逻辑门阵列)设计FIFO的接口电路,将各个DSP的EMIF总线接人FPGA中,可实现多块DSP之间的连接.实验结果表明,这种方式无需外加逻辑器件即可实现高速传送数据通用于数据块的传送.这种设计已应用于由4片DSP构成的信号处理系统中.     

基于FPGA和DSP的超声波检测系统设计

针对目前机车车辆模拟式超声波检测仪器的不足,设计了一种基于FPGA和DSP的数字式超声波检测系统.整个系统由信号预处理模块、高速AD转换器和数据采集处理等模块构成,解决了超声波检测中的高速数据采集和处理的关键问题,实现了超声波信号的检测、处理和显示.试验结果表明,由于采用高速数字信号处理技术,不仅提高了检测系统的精度,而且系统运行稳定可靠,达到超声波信号检测要求.     

结构振动主动控制的混合仿真和实时控制系统设计

本文针对结构振动主动控制问题构造了基于PC机和DSP的混合仿真和实时控制系统.设计这套系统的目的是要实现在结构振动主动控制中集数据采集、信号处理、模型辩识、控制器设计、多目标优化、控制仿真和实时控制等多功能为一体的计算机辅助控制器设计系统.由于这套系统在仿真和实时控制中均利用了DSP,使得仿真结果更接近于实际的控制效果,因而提高了控制器的开发效率,有利于进一步的实际应用.     

基于DSP采集与处理GPS信号的系统设计

描述一种基于DSP采集与处理GPS信号的系统软硬件设计方法,介绍DSP的串口通信的工作原理,NMEA-0813通信协议;设计并实现GPS定位信息的实时采集和解译,为进一步GPS技术应用奠定基础。     

基于虚拟仪器技术的三维微振动测试系统

为进一步提高测试系统的准确性,在研究机械振动分析理论与常用测试方法的基础上,设计开发了基于虚拟仪器技术的机械微振动三维测试与分析系统。以LabVIEW为开发平台,实现信号采集、数据处理、时域分析、频域分析、存储、回放和故障诊断等功能;利用小波分析对信号进行处理得到故障特征信号,解决了复杂机械微振动的技术分析,具有界面友好、操作简单和性能好等优点。     

检定和校准证书的异同与应用

本文介绍了检定和校准以及证书的两点相同、五点不同之处,说明了对检定证书和校准证书的正确应用。     

Synthesis and luminescent properties of alkali-metal and ammonium fluorosulfatozirconates and fluorosulfatohafnates

We have synthesized a variety of alkali-metal and ammonium fluorosulfatometallates (titanates, zirconates, and hafnates). The alkali fluorosulfatozirconates and fluorosulfatohafnates have been shown to exhibit efficient roentgenoluminescence (RL) in the UV through visible spectral region, with a maximum at 390–440 nm. Their RL spectra depend significantly on their composition (cation, anion, and water content), coordination of KF and K₂SO₄, and relative amounts of fluorine and SO₄ groups. We have examined the effect of heat treatment on the RL of these compounds. The rubidium and cesium fluorosulfatozirconates Rb₃Zr₂F₉SO₄ · 2H₂O, Cs₂ZrF₂(SO₄)₂ · 2H₂O, Cs₈Zr₄F₂(SO₄)₁₁ · 16H₂O, and Cs₂ZrF₄SO₄ offer the most efficient RL.     

Heat and Mass Transfer and Modeling and Prediction of Environmental Catastrophes

Basic definitions and concepts of the physicomathematical theory of natural catastrophes are given. Possibilities of mathematical modeling of natural and technogenic catastrophes are discussed in the context of the theory of heat and mass transfer and the mechanics of reacting media. The importance of taking into account conjugate heat and mass exchange in modeling catastrophes is emphasized. A formula for evaluating the probability of a collisional catastrophe is given.     

Multi-ferroic and magnetoelectric materials and interfaces

The existence of multiple ferroic orders in the same material and the coupling between them have been known for decades. However, these phenomena have mostly remained the theoretical domain owing to the fact that in single-phase materials such couplings are rare and weak. This situation has changed dramatically recently for at least two reasons: first, advances in materials fabrication have made it possible to manufacture these materials in structures of lower dimensionality, such as thin films or wires, or in compound structures such as laminates and epitaxial-layered heterostructures. In these designed materials, new degrees of freedom are accessible in which the coupling between ferroic orders can be greatly enhanced. Second, the miniaturization trend in conventional electronics is approaching the limits beyond which the reduction of the electronic element is becoming more and more difficult. One way to continue the current trends in computer power and storage increase, without further size reduction, is to use multi-functional materials that would enable new device capabilities. Here, we review the field of multi-ferroic (MF) and magnetoelectric (ME) materials, putting the emphasis on electronic effects at ME interfaces and MF tunnel junctions.     

CellML and associated tools and techniques

We have, in the last few years, witnessed the development and availability of an ever increasing number of computer models that describe complex biological structures and processes. The multi-scale and multi-physics nature of these models makes their development particularly challenging, not only from a biological or biophysical viewpoint but also from a mathematical and computational perspective. In addition, the issue of sharing and reusing such models has proved to be particularly problematic, with the published models often lacking information that is required to accurately reproduce the published results. The International Union of Physiological Sciences Physiome Project was launched in 1997 with the aim of tackling the aforementioned issues by providing a framework for the modelling of the human body. As part of this initiative, the specifications of the CellML mark-up language were released in 2001. Now, more than 7 years later, the time has come to assess the situation, in particular with regard to the tools and techniques that are now available to the modelling community. Thus, after introducing CellML, we review and discuss existing editors, validators, online repository, code generators and simulation environments, as well as the CellML Application Program Interface. We also address possible future directions including the need for additional mark-up languages.     

热交换器的分类及优缺点分析

热交换器是将不同温度介质之间的热量通过热传导的形式,由高温介质传递给低温介质,使介质达到生产所需温度的工艺设备,也可作为一种节能设备使用.通过对不同热交换器的结构分析,总结不同热交换器的优缺点、适用环境,为生产工艺设计人员及设备制造单位在选择可降低能耗、提高效率的设备上提供参考.     

The shape and stability of wall-bound and wall-edge-bound drops and bubbles

The behavior of wall-bound drops and bubbles is fundamental to many natural and industrial processes. Key characteristics of such capillary systems include interface shape and stability for a variety of gravity levels and orientations. Significant solutions are in hand for axisymmetric pendent drops for a variety of uniform boundary conditions along the contact line with gravity acting normal to a planar wall. The special case of a wall-bound drop or bubble that is also pinned at an edge (i.e. a ‘wall-edge-bound’ drop) is considered here where numerical solutions are obtained for interface shape and stability as functions of drop volume, contact angle, fluid properties, and uniform gravity vector. For a semi-infinite zero-thickness planar wall (plate), a critical contact angle is identified below which wall-edge-bound drops are always stable. The critical contact angle is computed as a function of the gravity vector. The numerical procedure, which makes no account for contact angle hysteresis, predicts that such wall-edge-bound drops are unconditionally unstable for any gravity field with a component that is tangent to the wall while inwardly normal to the edge. Select experiments are conducted that support the conclusions drawn from the numerical results.