深圳地铁9号线盾构法隧道管片预埋滑槽设计研究及探讨

为解决地铁隧道机电设备安装阶段打孔对管片结构的损伤问题,以深圳地铁9号线工程为背景,对盾构法隧道管片预埋滑槽设计进行相应的研究和探讨。通过相关的受力计算分析及试验验证,认为在地铁盾构法隧道内设计预埋滑槽的方案是安全可靠的,实施是可行的,可在相同类型工程中加以推广应用,以达到方便施工、易于维护和节能环保的绿色建造目的。     

一种用于数据驱动建模的信号发生器设计

提出了一种基于现场可编程门阵列（Field-Programmable Gate Array,FPGA）和ARM的直接数字式频率合成（DDS）信号发生器,产生频率可调的正弦波、三角波和方波信号,其中方波的占空比可调．阐述了信号发生器的体系结构,对波形产生的最小频率做了精确计算,同时对方波的占空比改变方式进行了设计和计算．在分析方波滤波电路后,计算确定了低通滤波器的电阻和电容值．最后对系统实现的效果做了频谱分析,结果表明,设置频率为主要分量,达到了设计要求．     

基于CAN总线的船舶电站模拟器的实现

本文介绍船舶电站模拟器的功能,以及基于CAN总线的船舶电站模拟器的结构和软、硬件设计方法。     

一种基于ARM的蓄电池参数检测模块

本文介绍一种以智能传感器和CAN总线为核心的智能化铅酸蓄电池参数检测的设计思想和方法。该模块能对单块蓄电池电压、温度、密度进行检测,并对液位进行上、下限报警。该模块由于使用了数字化技术及CAN总线技术,不但降低了成本,还提高了模块的实时性、可靠性和灵活性。     

Design and model test of a soft-connected lattice-structured floating solar photovoltaic concept for harsh offshore conditions

Various types of floating solar photovoltaic (FPV) devices have been previously proposed, designed and constructed with applications primarily limited to onshore water bodies or near-shore regions with benign environmental conditions. This paper proposes a novel FPV concept which can survive harsh environmental conditions with extreme wave heights above 10 m. This concept uses standardised lightweight semi-submersible floats made of circular materials as individual modules. The floating modules are soft connected with ropes to form an FPV array. We first present the conceptual design of the floats and the connection systems, including hydrostatic, hydrodynamic, and structural assessments of the floats. To verify the motion response performance, we carried out 1:60 scaled model tests for a 2 by 3 array under regular and irregular wave conditions. From the time series and response spectra, the motion characteristics of the array and the mooring responses are analysed in detail. The proposed concept exhibits excellent performances in terms of modular motions with limited wave overtopping and no contact is observed between adjacent modules under the extreme wave conditions. The findings of this study can serve as a valuable reference to developing reliable and cost-effective FPV technologies for offshore conditions.     

津滨轻轨客流特征及功能定位研究

津滨轻轨9号线是连接天津市中心城区和滨海新区的骨干轨道线路,对天津市双城格局的形成起到重要的支撑作用.依托天津市轨道交通AFC票务数据,整理分析津滨轻轨9号线的现状客流特征,包括其客流增长规律和客流的时间、空间分布特征,以及津滨轻轨在地铁5号线开通后,对城区客流服务的增强等内容.基于客流特征,研究分析津滨轻轨现状和规划...