GPS-RTK技术在矿山测量中的应用及优缺点

文章简要介绍了GPS-RTK技术基本原理及构成,阐述了GPS-RTK技术在矿山测量中的应用,分析了GPS-RTK技术具体应用中的优势和缺点,并就RTK技术在实际应用中遇到的问题提出相关的见解。     

车拐斜坡区下侏罗统八道湾组沉积特征分析

通过对研究区沉积层序、岩芯特征、粒度特征、测井资料及录井资料的详细分析,对比总结了该地区的沉积模式和序列特征,研究表明地层抬升,气候潮湿,雨量充沛,造成西北部物源供应大,八道湾组沉积早期,研究区以辫状河沉积体系为主,随后,物源供应下降,加之快速湖侵,过渡为辫状河三角洲及湖泊沉积体系。     

无刷直流电机调速系统鲁棒性设计

为提高无刷直流电机调速系统的鲁棒性,利用扰动观测器对外部负载转矩扰动进行估计并加以补偿,利用模糊自适应控制器实现PID参数的在线自整定,以适应因系统内部参数变化引起的扰动.仿真和实验表明,所设计的调速系统对系统负载扰动和参数变化的鲁棒性较好,并具有较高的速度跟踪精度.     

使用运动监视传感网络对行走过程中腿部屈伸角的跟踪

An accelerometry-based gait analysis approach via the platform of sensor network is reported in this paper. The hardware units of the sensor network are wearable accelerometers that are attached at the limbs of human body. For the specific task of gait analysis, flexion angles of the thighs during gait cycles are computed. A Kalman filter is designed to estimate the flexion-extension angle, angular velocity of the thigh using the output of the wearable accelerometers. The proposed approach has been applied to four subjects and the performance is compared with videobased approach. Comparative results indicate that with the proposed Kalman filter, the sensor network is able to track the movement of the thighs during gait cycles with good accuracy and simultaneously detect major gait event of foot contact from the waveform of the angular velocity.