摘要：In order to speed up and simplify the design of the quadrotor unmanned aerial vehicle(UAV)and carry out experimental simulation and verification of relevant control algorithms,this paper analyzed the system dynamics model of the mechanical structure and flight principle of the quadrotor aircraft,and used the Newton-Euler method to derive the non-linear dynamic *** at improving the modeling accuracy and system integrity of the quadrotor,the physical system modeling was combined with the CAD software and the Matlab/Simscape *** three-dimensional quadrotor solid model built by CAD software was imported into the Simscape simulation platform to construct the body and power system model of the *** on this,the control algorithm designed by Simulink was added to the simulation platform to facilitate the experiment verification and parameter *** simulation results show that the designed aircraft can achieve hover and tracking well and meet the control performance requirements of the system.

摘要：The attitude adjustment of rope system faces the challenging due to the difficulty in obtaining accurate three-dimensional(3D)mathematical model and solving by traditional methods.A set of adjustment systems is designed and used to investigate the automatic control for level or preset attitude adjustment of unknown weights and eccentric *** system principle and characteristics are *** 3D model is decomposed into two two-dimensional(2D)subsystems,and an adaptive fuzzy controller based on BP neural network and least squares(LSE)is *** simulation experiment uses MATLAB to train the level-adjustment data for testing algorithm,and a small load is used to verify the effectiveness of the *** experimental results show that precise attitude adjustment can be achieved within the system load range,and the response speed is *** adjustment method provides a fast and effective method for precise adjustment of the load attitude.

摘要：目的　利用超声波进行近距离测试的研究 .方法　根据压电晶体的正逆压电效应 ,发射和接收超声波 ,介绍了换能器的设计结构及收发电路 .结果与结论　超声换能器配以适当的收发电路 ,可以使超声能量的定向传输 ,并按预期目的接收反射波 ,实现超声遥控、测距。

摘要：针对以往采集电路中放大倍率固定,适用的采集环境单一,不可灵活调理实际微弱信号的现状,设计了基于 FPGA 的增益可调微弱信号采集系统,该系统以 FPGA 为核心,以集成运算放大器OP37G,模拟开关 DG611DY 组成增益可调放大电路,具备了×0.5,×2,…,×100,×200 等 10 种放大倍率可编程控制的功能,以高精度模数转换芯片 AD7865 为采集芯片,实现了高精度微弱信号的采集。试验结果表明:系统在多种微弱信号环境下经增益电路放大后,各通道采样精度均能达到 0.1%。系统可灵活应用于多种微弱信号采集环境,稳定可靠,已成功应用于某微弱信号测试场合。

摘要：针对检测特定环境中甲烷气体浓度的需要,设计一种可实现甲烷气体浓度检测和报警的无线传感器网络节点。该节点采用多个MJC4/3.0L型甲烷传感器采集甲烷浓度信号,以MSP430超低功耗单片机为核心,实现数据采集、存储、处理和传输等功能,应用贝叶斯估计的多传感器数据融和方法,降低了传感器故障对检测结果的影响,同时提高了检测结果的准确性和可靠性。

摘要：目前,超声技术被广泛使用,超声频段内期望信号的质量成为关键因素.利用平面波展开法设计一种局域共振型声子晶体结构的带阻滤波器,对10 MHz以内的超声频段进行仿真分析.得出频率在4.5 MHz以下和7.25-10MHz为通带,该频段内亦可实现信号增强;4.5 - 7.25 MHz为禁带,具有较好的滤波作用.所设计的声子晶体结构体积较小,可适用于小尺寸的超声探头前端,实现原始的非电量信号直接滤波.

摘要：以研究操作者的技能水平为目的,对操作者状态进行测定。应用多元回归分析,从测定中推定操作者的技能水平。其结果表明操作者的状态与技能水平有着极为密切的关系,从而得出操作者的技能水平可由其状态来推定这一结论。

摘要：针对传统的工艺加工敏感元件周期长、零件间摩擦阻尼大的特性,提出基于3D刻录技术电涡流传感器的改良型敏感元件加工制备方法。设计工艺包括了敏感元件的模型建立,参数调整和实测效果验证等。实验结果表明,3D刻录涡流传感器线性范围为0~5 mm,非线性误差为0.7%,有更宽的线性范围和更好的响应灵敏度。与传统工艺制造的传感器相比,3D刻录涡流传感器具有更低的制造成本,打印模块重复利用率高,可以通过多次原型迭代来优化传感器性能。

摘要：为提高温度测量效率,降低系统的成本,扩展传输距离,设计出一种新型温度采集系统。单片机通过控制具有单总线方式的温度传感器DS18B20实现对温度的测量,同时单片机通过控制具有单总线方式300～450 MHz频率范围内的MAX7044与MAX7033无线发射与接收芯片实现温度数据的无线传输。与传统温度采集系统相比,该系统利用单总线方式连接,采用无线传输方式实现远距离通信,易于系统的集成与扩展。实验结果表明,该系统结构简单、方便移植,能够同时实现多达上百点温度的测量与500 m范围的传输。

摘要：文章提出了利用压电谐振机理实现超低频振动传感器的实用方法,通过对压电谐振式传感机理分析研究,得出可测超低频范围在0～3 Hz。设计了超低频振动传感器的具体电路、变频组成及模拟结果。