旋转环境下的无线时钟抖动估计与修正方法
2022年电子技术应用第8期
卢翔宇1,陈正武1,刘 雄2
1.中国空气动力研究与发展中心 气动噪声控制实验室,四川 绵阳621000; 2.西南科技大学 信息工程学院,四川 绵阳621000
摘要:直升机旋翼表面非定常载荷测量试验中,导电滑环的性能优劣和现场环境的电磁辐射对外部时钟信号的质量影响较大,受影响的外部时钟信号会导致错误的采集动作,从而无法准确地获取特定方位角处的载荷数据。为提高外部时钟信号的品质,提出一种用于旋转环境下的数据采集系统的无线时钟抖动估计及修正方法,即外部时钟信号经无线收发模块传输,采用两组相位差90°的三角波进行等幅度斜边估计时钟抖动量,并且使用拉格朗日插值算法修正传感器的采样值。仿真与风洞表明,该方法能有效地减小外部时钟抖动造成的采集误差,对准确测量旋转环境下旋翼表面的载荷信号具有显著效果。
中图分类号:TN919.3
文献标识码:A
DOI:10.16157/j.issn.0258-7998.212498
中文引用格式:卢翔宇,陈正武,刘雄. 旋转环境下的无线时钟抖动估计与修正方法[J].电子技术应用,2022,48(8):76-80,85.
英文引用格式:Lu Xiangyu,Chen Zhengwu,Liu Xiong. Wireless clock jitter estimation and correction method in rotating environment[J]. Application of Electronic Technique,2022,48(8):76-80,85.
文献标识码:A
DOI:10.16157/j.issn.0258-7998.212498
中文引用格式:卢翔宇,陈正武,刘雄. 旋转环境下的无线时钟抖动估计与修正方法[J].电子技术应用,2022,48(8):76-80,85.
英文引用格式:Lu Xiangyu,Chen Zhengwu,Liu Xiong. Wireless clock jitter estimation and correction method in rotating environment[J]. Application of Electronic Technique,2022,48(8):76-80,85.
Wireless clock jitter estimation and correction method in rotating environment
Lu Xiangyu1,Chen Zhengwu1,Liu Xiong2
1.Laboratory of Aerodynamic Noise Control,China Aerodynamic Research and Development Center,Mianyang 621000,China; 2.School of Information Engineering,Southwest University of Science and Technology,Mianyang 621000,China
Abstract:In the measurement test of unsteady load on helicopter rotor surface, the performance of slip ring and the electromagnetic radiation of the field environment have great influence on the quality of external clock signal. In some serious cases, the affected external clock signal may lead to erroneous acquisition actions, which makes it impossible to accurately obtain the load data at a specific azimuth. In order to improve the quality of the external clock signal, a wireless clock jitter estimation and correction method of data acquisition system in rotating environment is proposed. The external clock signal is transmitted through the wireless transceiver modules, two sets of triangular waves with the phase difference of 90° are used to estimate the clock jitter with equal amplitude hypotenuse, and the Lagrange interpolation algorithm is used to correct the samples of sensors. Simulation and wind tunnel tests show that this method can effectively reduce the acquisition error caused by external clock jitter, and has significant effect on accurately measuring the load signal on the rotor surface in rotating environment.
Key words :external clock;clock jitter;data acquisition system;triangle wave;interpolation correction
0 引言
在直升机旋翼桨叶表面非定常载荷测量试验中,需要准确测量桨叶旋转过程中其表面载荷的变化规律,即采集不同方位角时对应的压力信号[1]。使用与桨叶同步旋转的编码器的输出脉冲作为数据采集的外部时钟信号,可以准确提供桨叶的方位角信息[2-6]。目前通常采用有线的方式将时钟信号进行传送:即通过导电滑环和线缆将编码器脉冲信号输送至数据采集设备。试验中发现,外部时钟信号经过干扰环境下的长距离传输和导电滑环后,其信号质量会受到影响[7],尤其在导电滑环磨损后以及时钟信号线与动力强电线缆长距离并行部署等重干扰情况下,时钟信号会出现高频毛刺和变形,导致数据采集设备产生错误的采集动作,从而无法实现相同相位的等角度采集。
本文详细内容请下载:http://www.chinaaet.com/resource/share/2000004655。
作者信息:
卢翔宇1,陈正武1,刘 雄2
(1.中国空气动力研究与发展中心 气动噪声控制实验室,四川 绵阳621000;
2.西南科技大学 信息工程学院,四川 绵阳621000)
此内容为AET网站原创,未经授权禁止转载。