OWC

摘要： A hybrid, porous breakwater-Oscillating Water Column(OWC) Wave Energy Converter(WEC) system is put forward and its hydrodynamic performance is investigated using the fully nonlinear, open-source computational fluid dynamics(CFD) model, OpenFOAM. The permeable structure is positioned at the weather side of the OWC device and adjoined to its front wall. A numerical modelling approach is employed in which the interstices within the porous structure are explicitly defined. This permits the flow field development within the porous structure and at the OWC front wall to be observed. The WEC device is defined as a land-fixed, semi-submerged OWC chamber. A range of regular incident waves are generated at the inlet within the numerical tank. The OWC efficiency and the forces on the structure are examined. Results are compared for the simulation cases in which the porous component is present or absent in front of the OWC chamber. It is found that the incorporation of the porous component has minimal effect on the hydrodynamic efficiency of the OWC, reducing the efficiency by less than 5%. Nevertheless,the forces on the front wall of the OWC can be reduced by up to 20% at the higher wave steepness investigated,through inclusion of the porous structure at the OWC front wall. These findings have considerable implications for the design of hybrid OWC-breakwater systems, most importantly in terms of enhancing the durability and survivability of OWC WECs without significant loss of operational efficiency.

摘要： Optical Wireless Communication(OWC)is a new trend in communication systems to achieve large bandwidth,high bit rate,high security,fast deployment,and low cost.The basic idea of the OWC is to transmit data on unguided media with light.This system requires multi-carrier modulation such as Orthogonal Frequency Division Multiplexing(OFDM).This paper studies optical OFDM performance based on Intensity Modulation with Direct Detection(IM/DD)system.This system requires a non-negativity constraint.The paper presents a framework for wireless optical OFDM system that comprises(IM/DD)with different forms,Direct Current biased Optical OFDM(DCO-OFDM),Asymmetrically Clipped Optical OFDM(ACO-OFDM),Asymmetrically DC-biased Optical OFDM(ADO-OFDM),and Flip-OFDM.It also considers channel coding as a tool for error control,channel equalization for reducing deterioration due to channel effects,and investigation of the turbulence effects.The evaluation results of the proposed framework reveal enhancement of performance.The performance of the IM/DD-OFDM system is investigated over different channel models such as AWGN,log-normal turbulence channel model,and ceiling bounce channel model.The simulation results show that the BER performance of the IM/DD-OFDM communication system is enhanced while the fading strength is decreased.The results reveal also that Hamming codes,BCH codes,and convolutional codes achieve better BER performance.Also,two algorithms of channel estimation and equalization are considered and compared.These algorithms include the Least Squares(LS)and the Minimum Mean Square Error(MMSE).The simulation results show that the MMSE algorithm gives better BER performance than the LS algorithm.

摘要： OWC装置空气透平物理模型试验系统由前端造流装置、透平、数据采集及控制系统组成,透平定常性能试验系统前端造流装置为定常风洞,产生定常气流;非定常性能试验系统的造流装置为活塞往复造流装置,可产生正弦往复气流.数据采集及控制系统包括:皮托管、电磁离合器、转矩转速传感器、伺服系统、压力变送器、数据采集及处理系统.通过此试验系统,可获取转速、转矩、风速、压力等参数,对透平的工作及自启动性能开展研究.

摘要： Wave energy can be converted to the electrical energy by using a wave energy converter. The wave energy converter with oscillating water column (OWC) is one of the most promising devices because of its simple structure and easy maintenance. In this device, an oscillating water column due to the wave motion is used to drive an air column. An air turbine is used to convert the pneumatic energy of this bi-directional airflow into the mechanical energy. The counter-rotating impulse turbine for wave energy conversion has been proposed and tested so far, and the average efficiency has been shown to about 0.3. On the contrary, in another offshore experiment, it has been reported that the power generation efficiency of this turbine is larger than Wells turbine in case of small waves. However, there is a scarcity of the detailed characteristics data of counter-rotating impulse turbine. In a previous study, the authors investigated the effect of rotor blade solidity and setting angle of guide vane on the performance of this turbine, and they clarified that the efficiency of this turbine is higher than impulse turbine with single rotor in the range of high flow coefficients. The present study aimed to investigate the effect of rotor blade profile on the turbine performance by using the computation fluid dynamic (CFD) analysis. The inner and outer angles of turbine rotor blade are changed in the range of 50° to 70°. The commercial CFD software of SCRYU/Tetra of Cradle Co. Ltd. was used in the present work. The Reynolds averaged Navier-Stokes (RANS) equations were used as the governing equations and the low Reynold’s number SST k-ω model was used to predict the turbulent stresses. As a result, it was found that the inner angle of γ = 70° and the outer angle of γ = 60° of the turbine rotor blades can give the best turbine efficiency and it shows the efficiency close to the impulse turbine with single rotor, even in the range of low flow coefficients.

摘要： The latest uproar in this era is about a technology termed as Light Fidelity or more commonly known as Li-Fi. There are currently two trends being seen: First, the extension or enrichment of wireless services and other being increased in user demand for these services, but the available RF spectrum for usage is very limited. So the new technology of Li-Fi came into picture, which uses visible light as a source of communication. Li-Fi is the most recent development which is resourceful. In this technology, LEDs are used to transmit data in the visible light spectrum. This technology can be compared with that of Wi-Fi and offers advantages like increased accessible spectrum, efficiency, security, low latency and much higher speed. This research paper aims at designing a Li-Fi transceiver using Arduino that is able to transmit digital data. The hardware has been designed using Eagle CAD (version 7.1.0) tool and Proteus design tool (version 8). The software coding is done by using Java (version 8). Successful transmission and reception of text, image and video signals is carried out on the transceiver. Hence this research work gives an innovative way of designing a transceiver which works by using off the shelf low cost components and using visible light spectrum.

摘要： 本文以可兼作振荡水柱式(Oscillating Water Column,简称OwC)波能发电装置的双圆筒沉箱为研究对象,采用物理模型试验的方法对不同隔墙夹角、内筒外直径、下部开口张角及下部开口高度等多个双圆筒沉箱模型进行了波能转换效率的研究.通过同步测量气室内波高和气室顶部输气口处气体压强等试验数据计算其波能转换效率,讨论了在规则波作用下气室尺寸参数,气室下部开口参数对气室换能效率的影响.

摘要： 在Web应用开发中,常需从数据库中提取数据并表示成各种图表.在实际开发中,要想将数据库中的数据在Web页面中以图表的形式呈现,必须通过复杂的代码才能实现.本文设计了基于OWC的Web通用图表分析控件,可以通过ASP.NET直接调用,实现了人们对数据的查询需要以图表方式呈现的要求,并使开发难度和工作量大大减少.

摘要： This study uses a numerical method to analyze the proposed model structure. Before the parametric analysis, a pre-analysis to make sure the analytical results are accountable, a verification analysis was performed. The results found are compared well with the limited experimental findings of Goda et al. and it is very encouraging to find that for the proposed method as an alternative for green energy developments, as long as an appropriate design is performed, an OWC combined with breakwater structure may provide an alternative for green energy system utilized in a harbor area. From the results of the first stage of parameter analysis that the size of the openings of the cell of converting system is variable, a traditional full opened cell is not necessary the most efficient design for the wave power conversion in terms of the variations of air pressure inside the cell and air speed through the outlet orifice that will drive the electricity power generator.

摘要： 本发明一档使用OWC的双离合变速箱的下坡控制方法涉及一种双离合变速箱的控制方法，特别是涉及一种用于在一档使用OWC的双离合变速箱在下坡时的控制方法。其目的是为了提供一种一档使用OWC的双离合变速器在下坡时避免在一档长时间空挡滑行，保障安全的一档使用OWC的双离合变速箱的下坡控制方法。本发明一档使用OWC的双离合变速箱的下坡控制方法包括以下步骤：基于变速箱输入扭矩和加速度确定下坡模式；确定档位选择是手动还是自动；如果档位选择是自动，则降低1档升2档升档点车速，并降低2档降1降档点车速；如果档位选择是手动，那么则禁止换入1档直至停车。

摘要： 本发明属于海洋能及海洋渔业技术领域，具体涉及种OWC发电单元及一种集成OWC发电单元阵列的漂浮式网箱。本发明设计了一种OWC发电单元，当波浪作用于OWC发电单元引起气室内部的水体作升沉运动，此时波浪能转换为水柱的势能；振荡水柱对气室内的空气产生正压和负压，进而剧烈流动的空气驱动气室上方的空气透平系统做功发电，实现势能‑机械能‑电能的转化。本发明通过将多个OWC发电单元通过OWC气室隔墙呈圆形阵列排布，并与漂浮式网箱集成，保障深水网箱全天候、平稳持续的自供能运行，符合空间共享、海能海用的理念。

摘要： 本发明公开了一种基于OWC原理的自航式掺气增氧船及其增氧方法，该增氧船包括主船体，底层甲板的底部与主船体之间形成压舱水室，在压舱水室内注满水；在底层甲板的顶部安装两个结构相同的掺气增氧系统和一个密封舱，还包括有掺气增氧系统，所述的密封舱内安装控制上述进水电磁阀、排水电磁阀、水泵及下述电机、两个船体推进器工作的单片机和为增氧船内各部件供电的电池。本发明所公开的增氧船具有很高的智能性和灵活性：可自主巡航作业，航行过程利用太阳能供能，可实现对任意海域的掺气增氧，增氧区域不再受限，维护操作也更便利。

摘要： 本发明涉及汽车配件技术领域，具体为OWC汽车发电机皮带轮，采用一端球轴承、另一端滚针轴承设计，滚针轴承和单项离合单元为一体，将发电机质量贯性从内燃机的曲柄转速不均匀性中解除，在曲柄不均匀的运转过程中，只有在加速阶段才驱动发电机轴.其它时段皮带轮空转；本发明的有益效果：减少前端轮系张紧力波动，提高前端轮系各零部件寿命；减少前端轮系的转速波动，降低前端轮系的噪音；避免反向冲击，有效保护发电机；降低怠速以及换挡时的噪音,降低空转时的油耗和排放量，节约能源5%；降低发电机反转造成的能量消耗，节约能源5%。

摘要： 本发明一档使用OWC的双离合变速箱的下坡控制方法涉及一种双离合变速箱的控制方法，特别是涉及一种用于在一档使用OWC的双离合变速箱在下坡时的控制方法。其目的是为了提供一种一档使用OWC的双离合变速器在下坡时避免在一档长时间空挡滑行，保障安全的一档使用OWC的双离合变速箱的下坡控制方法。本发明一档使用OWC的双离合变速箱的下坡控制方法包括以下步骤：基于变速箱输入扭矩和加速度确定下坡模式；确定档位选择是手动还是自动；如果档位选择是自动，则降低1档升2档升档点车速，并降低2档降1降档点车速；如果档位选择是手动，那么则禁止换入1档直至停车。

摘要： 本发明一档使用OWC的双离合变速箱的下坡控制方法涉及一种双离合变速箱的控制方法，特别是涉及一种用于在一档使用OWC的双离合变速箱在下坡时的控制方法。其目的是为了提供一种一档使用OWC的双离合变速器在下坡时避免在一档长时间空挡滑行，保障安全的一档使用OWC的双离合变速箱的下坡控制方法。本发明一档使用OWC的双离合变速箱的下坡控制方法包括以下步骤：基于变速箱输入扭矩和加速度确定下坡模式；确定档位选择是手动还是自动；如果档位选择是自动，则降低1档升2档升档点车速，并降低2档降1降档点车速；如果档位选择是手动，那么则禁止换入1档直至停车。

摘要： 本实用新型公开了一种基于OWC原理的自航式掺气增氧船，该增氧船包括主船体，底层甲板的底部与主船体之间形成压舱水室，在压舱水室内注满水；在底层甲板的顶部安装两个结构相同的掺气增氧系统和一个密封舱，还包括有掺气增氧系统，所述的密封舱内安装控制上述进水电磁阀、排水电磁阀、水泵及下述电机、两个船体推进器工作的单片机和为增氧船内各部件供电的电池。本实用新型所公开的增氧船具有很高的智能性和灵活性：可自主巡航作业，航行过程利用太阳能供能，可实现对任意海域的掺气增氧，增氧区域不再受限，维护操作也更便利。

摘要： 本实用新型涉及汽车配件技术领域，具体为OWC汽车发电机皮带轮，采用一端球轴承、另一端滚针轴承设计，滚针轴承和单项离合单元为一体，将发电机质量贯性从内燃机的曲柄转速不均匀性中解除，在曲柄不均匀的运转过程中，只有在加速阶段才驱动发电机轴.其它时段皮带轮空转；本实用新型的有益效果：减少前端轮系张紧力波动，提高前端轮系各零部件寿命；减少前端轮系的转速波动，降低前端轮系的噪音；避免反向冲击，有效保护发电机；降低怠速以及换挡时的噪音,降低空转时的油耗和排放量，节约能源5%；降低发电机反转造成的能量消耗，节约能源5%。