Study on Model Aerodynamical Measurement with Wire-driven Parallel Suspension in Low-Speed Wind Tunnel

将绳牵引并联机构应用于低速风洞模型支撑是近年来随着并联机构与力控制技术发展而提出的一种新概念。它作为一种新式支撑具有传统支撑不可比拟的优势。然而目前对于这种“软式”支撑的实验研究还处于起步阶段，鲜见有关该类支撑风洞吹风的试验结果。本文对此开展了相关研究，提出通过测量牵引绳拉力变化解算实验模型风洞吹风试验所承受的气动载荷的方法，并构建了测力系统，通过风洞吹风试验对实验模型气动参数的获取方法进行了初步的验证。 本文的主要工作如下： 首先，针对风洞传统支撑的方式及其缺点，分析了传统的风洞试验中模型气动参数的测量方法，阐述了绳牵引并联机构用做风洞试验支撑系统的诸多优势，体现了本文研究的背景和意义。...With the recent development of parallel mechanism and force control technology, a new concept is proposed by using the wire-driven parallel manipulator as model suspension system in low-speed wind tunnel tests. As a new style suspension, it shows an irreplaceable superiority over the traditional support system. However, the research on the “soft-style” suspension is still at the primary stages, an...学位：工学硕士院系专业：物理与机电工程学院机电工程系_机械制造及其自动化学号：1992006115183

Model Aerodynamic Tests with a Wire-driven Parallel Suspension System in Low-speed Wind Tunnel

根据绳牵引并联机构的优点,建造了一种新型的用于低速风洞试验的飞机模型绳牵引并联支撑系统,研究该系统中模型的空气动力参数的测量与计算方法。文中对机构进行了静力学分析,建立了描述实验模型气动载荷的数学模型,提出了通过测量绳系拉力求得模型空气动力参数的解算方法;设计并构建了绳系拉力测量及数据采集系统;将该系统置于开口式回流低速风洞中进行了吹风试验,采集了模型在不同姿态和不同风速下的各牵引绳的拉力数据,并对数据进行了处理分析,通过解算得到了不同吹风条件下模型的气动载荷参数曲线。研究结果表明,绳牵引并联机构用于低速风洞试验的支撑系统是可行的。Owing to the advantages of wire-driven parallel manipulator, a new wire-driven parallel suspension system for airplane model in low-speed wind tunnel is constructed, and the methods to measure and calculate the aerodynamic parameters of the airplane model are studied.In detail, a static model of the wire-driven parallel suspension is analyzed, a mathematical model for describing the aerodynamic loads exerted on the scale model is constructed and a calculation method for obtaining the aerodynamic parameters of the model by measuring the tension of wires is presented.Moreover, the measurement system for wire tension and its corresponding data acquisition system are designed and built.Thereafter, the wire-driven parallel suspension system is placed in an open return circuit low-speed wind tunnel for wind tunnel tests to acquire data of each wire tension when the airplane model is at different attitudes and different wind speeds.A group of curves about the parameters for aerodynamic load exerted on the airplane model are obtained at different wind speeds after the acquired data are analyzed.The research results validate the feasibility of using a wire-driven parallel manipulator as the suspension system for low-speed wind tunnel tests.NationalNaturalScienceFoundationofChina(50475099

基于目标约束的NURBS方法凸轮曲线寻优创成设计

针对凸轮机构的设计优化问题,提出了一种通用的NURBS（Non Uniform Rational B-Splines）凸轮曲线寻优创成设计方法,即采用NURBS曲线实现凸轮从动件位移、速度、以及加速度的表达。在约束条件及目标函数的双重限制下,通过数值迭代优化算法对NURBS曲线的控制顶点及权因子进行同步整定以实现凸轮曲线的优化设计与创成,使其满足设计所要求的运动学约束、几何约束、压力角约束、运动不失真条件等综合性能指标。特别地,此方法不仅能够实现优化水平的整体控制,还能够对凸轮运动曲线的局部形状实现自适应调整,使其具有最佳的性能特征。以一DRD（Dwell-RiseDwell）型直动从动件盘型凸轮机构的凸轮曲线设计为例,验证了NURBS凸轮曲线寻优创成设计方法的有效性。应用实例表明,与传统的凸轮曲线设计方法相比,基于目标约束的NURBS方法凸轮曲线寻优创成设计能够在强耦合的约束关系之间,获得目标设计参数最优的凸轮曲线形状表达

Nematicidal and Brine Shrimp Lethality of Secondary Metabolites from Marine-derived Fungi

对采集自浙江舟山海域底泥、福建省九龙江口红树林及福建省云霄县红树林共188株海洋真菌代谢产物的杀小杆线虫(Rhabditissp.)和卤虫(brine shrimp)活性进行初步研究.筛选出#164菌株代谢产物对小杆线虫显示了较好的杀害活性,其LC90小于0.5 mg/mL.#122菌株代谢产物对卤虫显示了较强的麻痹效应.#305菌株代谢产物对卤虫的LC50仅为75μg/mL.此外,对188株海洋真菌代谢产物的乙酰胆碱酯酶抑制活性进行研究,筛选出#229菌株代谢产物和#170菌株代谢产物具有较强的乙酰胆碱酯酶抑制活性,IC50分别为30μg/mL和25μg/mL,这些活性菌株具有产生杀线虫剂或乙酰胆碱酯酶抑制剂的特性.The nematicidal,brine shrimp lethality and acetylcholinesterase inhibitory activity of secondary metabolites from 188 marine-derived fungi were tested.The fungi were derived from the sediment in Zhoushan sea area and the mangrove at Yunxiao County and Jiulongjiang estuary in Fujian Province.The ethyl acetate extract of #164 culture filtrate showed strong lethal effect on nematode Rhabditis sp.at concentration of 0.5 mg/mL.Its LC_(90) was less than 0.5 mg/mL.The ethyl acetate extract of #122 culture filtrate showed strong paralyzing effect on brine shrimp at concentration of 0.5 mg/mL.It leaded to 100% mortality after treating for 2 h.And the ethyl acetate extract of #305 culture filtrate exhibited strong activity against brine shrimp at concentration of 100 μg/mL.It caused 90% mortality after treating for 24 h.Additionally,the ethyl acetate extracts of #229 and #170 showed strong inhibitory activity of acetylcholinesterase.The hyperactive acetylcholinesterase was one important character of Alzheimer's Disease symptoms.Acetylcholinesterase inhibitors were one effective approach for treating the symptoms of Alzheimer's Disease.Acetylcholinesterase inhibitors were also one important type of insecticides.It inhibited the loss of acetylcholine and impelled the overexcited state of insect's mental functions.Ultimately,it leaded the insect to death.All the bioactive marine-derived fungi had the possibility to produce nematicide or acetylcholinesterase inhibitors.国家863计划基金(2001AA620401);; 福建省科技计划(2004N003)基金资

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies