-
551.高阶的PID滑模控制：模拟鱼雷
[汽车制造业] [2015-08-27]
Position and speed control of the torpedo present a real problem for the actuators because of the high level of system nonlinearity and because of the external disturbances. The nonlinear systems control is based on several different approaches, which include the sliding mode control. This chapter deals with the basic concepts, mathematics, and design aspects of a control for nonlinear systems that make the chattering effect lower. As solution to this problem we will adopt as a starting point the high order sliding mode approaches and then the PID-sliding surface. Simulation results show that this control strategy can attain excellent control performance with no chattering problem.
关键词：滑模控制；PID控制器；抖振现象；非线性系统
-
552.分布式参数生物处理装置的分散模糊神经辨识和I-期限自适应控制
[信息传输、软件和信息技术服务业,计算机、通信和其他电子设备制造业] [2015-08-27]
The chapter proposed to use of a Recurrent Neural Network Model (RNNM) incorporated in a fuzzy-neural multi model for decentralized identification of an aerobic digestion process, carried out in a fixed bed and a recirculation tank anaerobic wastewater treatment system. The analytical model of the digestion bioprocess represented a distributed parameter system, which is reduced to a lumped system using the orthogonal collocation method, applied in four collocation points. The proposed decentralized RNNM consists of five independently working Recurrent Neural Networks (RNN), so to approximate the process dynamics in four different measurement points plus the recirculation tank. The RNN learning algorithm is the second order Levenberg-Marquardt one. The comparative graphical simulation results of the digestion wastewater treatment system approximation, obtained via decentralized RNN learning, exhibited a good convergence, and precise plant variables tracking. The identification results are used for I-term direct and indirect (sliding mode) control obtaining good results.
关键词：递归神经网络模型；模糊神经多模型；循环箱
-
553.光伏和风力涡轮机电力系统的先进控制
[电气机械和器材制造业,电力、热力、燃气及水生产和供应业] [2015-08-27]
Much more efforts have been made on the integration of renewable energies into the grid in order to meet the imperative demand of a clean and reliable electricity generation. In this case, the grid stability and robustness may be violated due to the intermittency and interaction of the solar and wind renewables. Thus, in this chapter, advanced control strategies, which can enable the power conversion efficiently and reliably, for both photovoltaic (PV) and wind turbines power systems are addressed in order to enhance the integration of those technologies. Related grid demands have been presented firstly, where much more attention has been paid on specific requirements, like Low Voltage Ride-Through (LVRT) and reactive power injection capability. To perform the functions of those systems, advanced control strategies are presented with much more emphasis on the LVRT operation with reactive power injection for both single-phase and three-phase systems. Other control strategies like constant power generation control for PV systems to further increase the penetration level, and the improvements of LVRT performance for a doubly fed induction generator based wind turbine system by means of hardware protection solutions are also discussed in this chapter.
关键词：可再生能源；电网；低电压
-
554.专业空气中气溶胶采样系统的运输效率计算指南
[水利、环境和公共设施管理业] [2015-08-27]
In nuclear facilities, radioactive aerosols can be a source of internal dose to workers. These particles are produced through inadvertent release of radioactive material from containment barriers such as piping, hoods, bags and glove boxes or produced through operations and maintenance of items and systems containing radioactive material. Resuspension of contamination is a recurring source of airborne radioactivity once contamination is established in a facility.
关键词：大气；气溶胶；空气治理
-
555.最终报告：移动源空气毒物缓解措施
[水利、环境和公共设施管理业] [2015-08-27]
In accordance with the Federal Highway Administration (FHWA) 'Interim Guidance Update on Mobile Source Air Toxic Analysis in NEPA Documents (September 30, 2009),' transportation projects subject to the National Environmental Policy Act (NEPA) must include an analysis of mobile source air toxics (MSATs). MSATs are air pollutants emitted by mobile sources that can cause serious health effects. Of a group of 93 MSAT compounds, the U.S. Environmental Protection Agency (USEPA) has identified seven compounds with significant contributions from mobile sources that are among the national and regional-scale cancer risk drivers from their 1999 National Air Toxics Assessment (NATA). These seven compounds consist of acrolein, benzene, 1,3-butadiene, diesel particulate matter plus diesel exhaust organic gases (diesel PM), formaldehyde, naphthalene, and polycyclic organic matter. FHWA classifies these seven compounds as the 'priority MSATs,' recognizing that this list is subject to change. The objectives of this project are to: (1) propose a 'screening' protocol that will facilitate the decision making process regarding which projects warrant MSAT assessment; (2) develop procedures (in consultation with regulatory agencies) for conducting qualitative and quantitative analyses of the seven priority MSATs in NYSDOT NEPA and SEQRA environmental documents; and (3) identify feasible MSAT mitigation measures for NYSDOT capital improvement projects and facilities. The work involves 10 separate tasks, including a guidance document for conducting MSAT assessments for projects that fall within NEPA/SEQRA.
关键词：大气；有毒气体；防护
-
556.山谷河流城市流动和污染物扩散的数值研究
[水利、环境和公共设施管理业] [2015-08-27]
Air flow and pollutant dispersion characteristics in a real valley city are studied under the real boundary condition.The 3D computational fluid dynamics using Reynolds-averaged Navier-Stokes modeling was carried out in Lanzhou which is a typical valley city in Northwest,China.The standard κ-ε turbulence model as a simplified computational fluid dynamics model is used to provide moderately fast simulations of turbulent airflow in an urban environment.The modeled flow field indicated that the geometry,wind direction and source location had a significant effects on the flow field.The flow shows the funnelling is rather obvious when the wind flow through the narrow area in the middle of the city.It is obvious that in the high-altitude region,due to the impact of high and low differential pressure and terrain,SO2 and NO2 formed two cyclic concentration field in the dispersion process.
关键词：大气；污染物；防止扩散
-
557.用于M109A6骑士重型旅战斗车辆的有害空气污染胶替代联邦规范MMM-A-1617的演示/验证
[水利、环境和公共设施管理业] [2015-08-27]
The goal of the Sustainable Painting Operations for the Total Army (SPOTA) program is to significantly reduce the amount of hazardous air pollutant (HAP) emissions produced in coating operations, including adhesives application and removal. Adhesives and sealants account for approximately 5% of U.S. Army-wide HAP emissions from surface coating operations. Materials conforming to Federal specification MMM-A-1617 have been recognized as one of the largest contributors. Laboratory test results previously conducted identified 3M-847 as a suitable HAP-free replacement adhesive that conforms to MMM-A-1617. This report focuses on the field trial conducted at Anniston Army Depot, AL, on a M109A6 Paladin heavy brigade combat vehicle. In particular, the hydraulic compartment door seal was bonded with HAP-free 3M-847 adhesive in place of the baseline (Clifton FA-1051) with successful results. The technicians found that processing the alternative adhesive was similar to that of the baseline, and after six months, the adhesive did not have any signs of blistering, delamination (either cohesively or adhesively), substrate failure, or deterioration of any kind. Overall, the HAP-free 3M-847 adhesive was qualified for use on MMM-A-1617 Army platforms.
关键词：大气；有害空气；大气污染物
-
558.用于离散混沌洛子峰地图控制器合成的新工具-分析程序
[汽车制造业] [2015-08-27]
In this chapter, it is presented a utilization of a novel tool for symbolic regression, which is analytic programming, for the purpose of the synthesis of a new feedback control law. This new synthesized chaotic controller secures the fully stabilization of selected discrete chaotic systems, which is the two-dimensional Lozi map. The paper consists of the descriptions of analytic programming as well as selected chaotic system, used heuristic and cost function design. For experimentation, Self-Organizing Migrating Algorithm (SOMA) and Differential evolution (DE) were used. Two selected experiments are detailed described.
关键词：分析编程；符号回归；混沌控制
-
559.改进针刺复合材料板材的加工和表征
[汽车制造业] [2015-08-27]
In the present investigation novel needle-processed S2-glass laminates are fabricated and several key failure modes are characterized. Double cantilever beam testing shows that mode I fracture toughness improves up to 270% compared to non-needled baseline material. In-plane compressive strength of needled material improves by up to 475%. In plane tensile strength shows mixed results, improving by 6% for moderate volume fractions of through- thickness reinforcement (TTR) and decreasing by 6% at larger volume fractions. Double lap shear tests show that interlaminar shear strength improves as much as 17% for TTR inserted at 45 relative to the laminate plane. X-ray micro- computed tomography (micro-CT) is used to investigate the unique 3D microstructure resulting from the needling process for 90 TTR samples. The micro-CT reconstructions show that the dimensions of the disturbances of the inplane fabric are significantly smaller than those imparted by the conventional tufting or stitching processes at each penetration site. Micro-CT reveals that some penetration sites are aggregates of closely spaced neighbors, resulting from the lack of precise spatial control with the needling process used in the present research. At these aggregate locations the in-plane disturbances are roughly equal in size to those from tufting/stitching.
关键词：表征；复合材料；抗压强度；层间
-
560.底特律地区交通研究：即启用抑制有效的区域交通因素的研究
[交通运输、仓储和邮政业] [2015-08-27]
An interdisciplinary team of six faculty members and six students at the University of Detroit Mercy (UDM) conducted a comprehensive study of the factors enabling or inhibiting development of effective regional transit. Focusing on Metro Detroit and four peer regionsAtlanta, Cleveland, Denver, and St. Louisinvestigators examined six key variables in transit success: 1) leadership and politics, 2) governance and law, 3) finance, 4) transit-oriented development (TOD), 5) equity and access, and 6) media and public opinion. These elements were studied in the context of Detroit transit history with respect to lessons learned, recent developments in Metro Detroit, and comparisons and recommendations. The team employed a nontraditional research methodology driven not by numbers but by the narrative of firsthand experience. They conducted in-depth interviews with more than 60 leaders in transit advocacy, development, and operation from five regions across the country, seeking the type of insight acquired almost exclusively through personal experience. The interviewees included: Current or previous CEOs of four regional transit authorities (RTAs) and more than 25 key staff members of RTAs Six RTA board members, including three board presidents Five MPO leaders of transit development in their regions A wide variety of stakeholders/advocates, including leading figures in business, education, labor, campaign consulting, and media Government leaders, including legislators, mayors and mayors staff The team then undertook the task of curating, organizing and assembling this accumulation of wisdom into cogent analyses that form the foundation of this report. This document provides and overview and summaries of key findings in all six areas of focus. Six separate reports explore each area in greater depth.
关键词：控制因素；底特律；领导；管理规范
027-87841330