基于分簇的传感网虚拟MIMO协议

提出一种应用于无线传感网的新型分簇式虚拟MIMO协议。协议基于簇头轮换,避免大量重新分簇带来的拓扑维护开销,从而提高网络能量效率。在簇间路由中,提出一种新型的“跨跳”操作,以平衡网络中不同节点与簇的能耗和生命周期。仿真实验结果表明,该协议较现有的的虚拟MIMO在能耗总量和均衡上均具有更好的效果。     

Numerical simulation and optimization of the cylinder head water jacket based on the two-phase flow boiling heat transfer

Boiling heat transfer and the controllability of the thermal load of the cylinder head were studied. The thermodynamic phase change characteristics of the cylinder head coolant were considered and the mass, momentum and energy transfers between two phases were calculated with the interface transfer sub-models by using the computational fluid dynamics software CFX. Results showed that compared with the single-phase flow without considering the boiling heat transfer, the sub-cooled boiling heat transfer of the cylinder head was greatly increased. According to the results of the numerical simulation, an optimized structure of the water jacket was proposed. Finally, temperature and velocity of coolant, diameter of flow passage and mean bubble diameter that influences sub-cooled boiling were studied using the orthogonal experiment method.     

Head Orientation Stability of Underwater Snake-Like Robot Swimming

In prior research,the orientation of head of the snake-like robot is changed according to the sinusoidal wave. To solve this problem,we propose Central Pattern Generator( CPG)-based control scheme with head-controller to stabilize the head of the underwater snake-like robot. The advantage of the CPG-based control scheme with head-controller is that the head of the underwater snake-like robot is direct to the target orientation during swimming. The relation between CPG parameters and orientation stability of head is discussed.The adaptation of the proposed method to environment changes is tested. The influences of CPG parameters and hydrodynamic forces on the orientation offset of head are investigated. The target orientation( the input of headcontroller) with an experimental optimization is calculated through a convenient method. To prove the feasibility of the proposed methodology,the different swimming modes have been implemented in our simulation platform.The results show that the oscillation of head’s orientation is inhibited effectively,and the proposed method has strong adaptation to environment and CPG parameters changes.     

可调角度弯钻杆的研制

在处理井下事故特别是藏鱼头事故时,由于鱼头不居中,甚至贴在井径变化较大处,因此很难实施普通打捞。现场普遍采用可弯肘节和折弯钻杆的方式进行寻找落鱼,实施打捞,有可能多次折弯钻杆,造成浪费,甚至造成井下更复杂情况的发生。根据这一情况,设计了可调角度弯钻杆。可调角度弯钻杆由上接头、花键体、调整套、下接头等组成,通过调节调整套和花键体等机构,可实现弯钻杆0°-4°调节。已完成可调角度弯钻杆的样机制造,并在多口井中进行应用。结果表明,采用可调角度弯钻杆可有效实施藏鱼头打捞,井口调节方便,应用取得了成功;单井可节约近30万元。     

地下水源热泵含水层水头分布及温度场的模拟分析

为使地下含水层能量更好为实际工程所用,进一步保护地下水空间,通过对地下水源热泵系统地下含水层中渗流场的分析,建立一抽一灌(对井抽灌)系统和一抽两灌系统地下水渗流数值模型,应用数值模拟方法对地下含水层渗流场水头分布及温度场进行模拟分析。结果表明:在相同的运行周期内,一抽两灌系统温度场的影响半径相对较小,并且抽灌井周围的等水头线分布较疏,水头变化缓慢,更利于地下水的回灌。尽量使回水井远离取水井,可以有效避免热贯通现象的发生。     

热连轧精轧宽度控制技术的研究及应用

在热轧带钢其他尺寸精度普遍较高的情况下,宽度控制精度的提升变得越来越重要。提出了一种新的精轧带钢宽度控制综合解决方案：针对带钢头部宽度控制,开发精轧机架冲击速降自学习模型,以减少带钢头部拉窄现象;通过合理配置精轧活套张力稳定因子,减少带钢中部宽度波动现象;通过精轧宽度反馈控制和宽展预测模型修正功能,提高带钢全长宽度精度。相关研究成果已成功应用于宝钢集团某热轧产线三电自主集成改造项目中,改造后带钢宽度控制精度得到显著提高。     

冷柱头进样气相色谱法分析橡胶防护蜡的碳数分布

研究冷柱头进样气相色谱法分析橡胶防护蜡的碳数分布以及正构烷烃/非正构烷烃比例。结果表明,采用冷柱头进样方法,在样品量为10 mg、样品完全溶解后静置10~30 min并取上层清液以及进样量为1μL时,分析得到的气相色谱峰的峰形和响应信号最优。本方法测定橡胶防护蜡的碳数分布以及正构烷烃/非正构烷烃比例结果准确、可靠。     

搅拌摩擦焊及其研究现状

搅拌摩擦焊是20世纪90年代初发明的一种固相连接技术，可以焊接通常 熔焊方法难以焊接的铝合金、钛合金等，并且具有一系列独特的优点，介绍了搅拌摩擦焊的工艺过程，分析了搅拌摩擦焊的特点、焊缝组织和性能以及影响搅拌摩擦焊的因素，综述了搅拌摩擦焊的国内外研究现状。     

辊套材料对铸轧区磁感应强度的影响

电磁场快速铸轧技术要求辊套材料不仅具有高导热系数、高承载能力和高抗疲劳能力,而且要具有磁场控制能力,保证铸轧区足够的磁感应强度,达到细化晶粒、改善板坯组织性能的目的.本文从介质对电磁场的集肤效应、涡流效应以及磁场衰减的角度,研究辊套对铸轧区电磁场的影响.     

CO2激光与TIG复合焊接铝合金

以铝合金2A12为主要研究对象，研究CO2激光与TIG复合热源焊接铝合金的工艺特点，设计制造了双焦点激光一电弧复合焊接头，讨论了影响复合焊接的各工艺参数。结果表明：影响复合焊接过程的主要工艺参数有激光功率、焊接速度、焊接电流、激光焦点位置以及两热源之间的距离等，并且在比较宽的参数范围内CO2激光与TIO复合焊接铝合金焊缝成形美观、无气孔等缺陷，焊速显著提高，是一种理想的焊接工艺。