用于点云数据实时显示的滑位处理方法研究

针对下位机向上位机发送数据时由于接收端和发送端的时钟不同源或者由于短促的干扰造成的数据异常,导致接收到的数据偏移若干个比特的问题,以LabWindows/CVI为平台使用C语言设计点云数据采集软件,采用滑位寻找帧同步码的方法,解决了因帧失步导致的帧内数据错位问题,进而通过TCP/IP网络协议接收实时图像数据,根据帧格式对图像数据进行接收、解析、离线处理以及实时显示,满足了接收速率达到380Mbps、0.2s内处理并显示一帧图像的需求。

数据缓存FIFO的滑位问题研究

在数据写入FIFO过程中,由于时钟偏移会引起数据多写或者少写,产生数据滑位现象。本文针对FIFO数据传输时出现的数据接收故障,进行分析排查,采用乒乓缓存、全局时钟等可靠性设计方案,解决了数据缓存FIFO中的滑位问题,保证了数据传输的正确性。

Shear mechanical properties and frictional sliding responses of rough joint surfaces under dynamic normal displacement conditions

A comprehensive understanding of the dynamic frictional characteristics in rock joints under high normal load and strong confinement is essential for ensuring the safety of deep engineering construction and mitigating geological disasters.This study conducted shear experiments on rough rock joints under displacement-controlled dynamic normal loads,investigating the shear behaviors of joints across varying initial normal loads,normal loading frequencies,and normal loading amplitudes.Experimental results showed that the peak/valley shear force values increased with initial normal loads and normal loading frequencies but showed an initial increase followed by a decrease with normal loading amplitudes.Dynamic normal loading can either increase or decrease shear strength,while this study demonstrates that higher frequencies lead to enhanced friction.Increased initial normal loading and normal loading frequency result in a gradual decrease in joint roughness coefficient(JRC)values of joint surfaces after shearing.Positive correlations existed between frictional energy dissipation and peak shear forces,while post-shear joint surface roughness exhibited a negative correlation with peak shear forces through linear regression analysis.This study contributes to a better understanding of the sliding responses and shear mechanical characteristics of rock joints under dynamic disturbances.

跨铁路立交桥钢箱梁分块安装技术

本文结合工程实例，介绍了跨铁路立交桥钢箱梁，分析了滑道支架的设计、块件的滑移要点以及箱梁测量定位技术。