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找到报告 53124 篇 当前为第 5197 页 共 5313

所属行业:汽车制造业

  • 51961.调制波形周期的归一化的单极性SPWM控制器

    [汽车制造业] [2014-07-30]

    The thesis mainly proposed a novel design method for Sinusoidal Pulse Width Modulation (SPWM) controller based on modulation waveform cycle normalization.T is the period ofsinusoidal modulation waveform,and T/n is the cycle of triangular carrier.Shift registers and adders of SPWM controller were designed to translate the 2n numerical value for SPWM waveform on-off switching points,which were calculated offline,to control the level of the outpout SPWM waveform,which is the key point of modulation waveform cycle normalization.In the thesis RTL function simulation verification by ModelSim and testing for FPGA have been achieved successfully.The results show that the novel SPWM controller is reliable,which has practical significance.
    关键词:控制器;调制波形周期;归一化;SPWM控制器
  • 51962.自适应控制器的适应时间和对驾驶的可用控制权影响

    [汽车制造业] [2014-07-29]

    Adaptive control is considered for highly uncertain, and potentially unpredictable, flight dynamics characteristic of adverse conditions. This experiment looked at how adaptive controller adaptation time to recover nominal aircraft dynamics affects pilots and how pilots want information about available control authority transmitted. Results indicate that an adaptive controller that takes three seconds to adapt helped pilots when looking at lateral and longitudinal errors. The controllability ratings improved with the adaptive controller, again the most for the three seconds adaptation time while workload decreased with the adaptive controller. The effects of the displays showing the percentage amount of available safe flight envelope used in the maneuver were dominated by the adaptation time. With the displays, the altitude error increased, controllability slightly decreased, and mental demand increased. Therefore, the displays did require some of the subjects resources but these negatives may be outweighed by pilots having more situation awareness of their aircraft.
    关键词:控制器;自适应控制器;试用时间;可用控制权;驾驶
  • 51963.气动定位阶段基于相对位置和相对加速度的的PDD~2控制器刚度和阻尼环的修改

    [汽车制造业] [2014-07-29]

    In our preceding works, the stage jerk feedback (SJFB) and base plate jerk feedback (BPJFB) schemes were successfully applied in a pneumatically actuated positioning stage. Where the relative position-based PDD~2 controller was used as the outer loop controller to maintain the positioning stability. However, since two accelerometers are used, each on the stage for SJFB and on the base plate for the BPJFB scheme, there is a possibility of modifying the stiffness and damping loops of PDD~2 controller from relative position-based to the relative acceleration-based inputs. Although there is no any advantage from the industrial application point of view, the bitterness of the modified PDD~2 controller is its simple structure while simple control scheme is desired. Therefore, this paper proposes the modification of stiffness and damping loops of PDD~2 controller such that to be energized by the relative acceleration signal. The objective is to check the feasibility of the proposed PDD~2 controller for the positioning performance without and with both SJFB and BPJFB schemes. It will help us in the future to think about calculating the stage acceleration signal through the relative position and base plate acceleration signals. So that there will be no need to use stage accelerometer, which results in the cost-effectiveness of the control system and safety of the setup. The experimental results show almost the same performances for the proposed PDD~2 controller as achieved through the conventional one.
    关键词:控制器;气动定位;PDD ~ 2控制器;刚度;阻尼环
  • 51964.正确设计的非参数模型复合开关

    [汽车制造业] [2014-07-29]

    In this paper, we present a controller design strategy for the implementation of a multicontroller structure for single-input single-output (SISO) plants. The overall control system can be viewed as a feedback interconnection of a SISO plant, a set of candidate controllers and a switched selection scheme that supervises the switching process among the candidate controllers. The switching scheme is designed without explicit assumptions on the plant model, based on the unfalsified control concept. A switched multicontroller structure is implemented and experimental results are presented.
    关键词:控制器;非参数模型;复合;开关
  • 51965.骑行运动模拟器的安全评价报告

    [汽车制造业] [2014-07-29]

    The Ride Motion Simulator (RMS), located at the U.S. Army Tank Automotive Research, Development and Engineering Center's (TARDEC) Ground Vehicle Simulation Laboratory (GVSL) in Warren, Michigan, is a high-performance, six degree-of-freedom (DOF), single occupant motion base designed to recreate the 'ride' of nearly any ground vehicle with high precision and accuracy. The simulator has two vehicle cabs that are essentially space frames that allow for a variety of vehicle configurations. The simulator was specifically designed for crew station and human-in-the-loop experiments. The RMS has a much higher bandwidth than most traditional driving simulators enabling it to recreate the high-frequency vibration often found in military vehicles traversing rough, cross-country terrains. The RMS was previously safety certified by both the U.S. Army Tank-automotive and Armaments Command (TACOM) and U.S. Army Developmental Test Command Safety Offices and was originally man-rated for operator-in-the-loop experiments. The writing of this report marks the replacement of the simulator's electronic controller with a custom Moog Test Controller. This report documents the analysis of the new motion controller for the RMS designed, built and installed for TARDEC by Moog, Inc. (East Aurora, NY). It provides system and component descriptions and a specific hazard analysis of the entire system. While this effort only replaces the electronic controls of the simulator, all simulator system and component descriptions are presented here for completeness. The scope of this analysis is the systematic assessment of the real and potential hazards associated with the RMS. This report is an attempt to identify hazards and to discuss the elimination or control of the identified hazards.
    关键词:控制器;骑行;运动模拟器;安全评价
  • 51966.精益绿色能源控制机的最终报告

    [汽车制造业] [2014-07-29]

    Achieving efficiency improvements and providing demand-response programs have been identified as key elements of our national energy initiative. The residential market is the largest, yet most difficult, segment to engage in efforts to meet these objectives. This project developed Energy Management System that engages the consumer and enables Smart Grid services, applications, and business processes to address this need. Our innovative solution provides smart controller providing dynamic optimization of energy consumption for the residential energy consumer. Our solution extends the technical platform to include a cloud based Internet of Things (IoT) aggregation of data sensors and actuators the go beyond energy management and extend to life style services provided through compelling mobile and console based user experiences.
    关键词:控制器;精益;绿色能源;最终报告
  • 51967.基于自适应LQG控制和模糊控制器的容错控制系统

    [汽车制造业] [2014-07-29]

    This paper describes a fault tolerant switching loop control study case for a three water tank laboratory setup with sensors and actuators redundancies. Fault diagnosis and tolerance are two main characteristics of intelligent setups when closed-loop control is used for large complex systems. Discrete adaptive LQG (linear quadratic) and Fuzzy fault tolerant controllers, for nominal situation, are presented and tested in the laboratory setup. For abrupt fault situation (structural fault), switching from one controller to another based on controller performance evaluation using PCA (principal component analysis) technique is implemented. The main contributions are: (a) proposed approach based on PCA to detect structural faults; (b) performance assessment based on performance index through Mahalanobis distance using T~2 statistics and (c) control switching between LQG and Fuzzy controllers based on the performance index. Experimental results applied to a three-tank laboratory setup in the presence of a structural fault are shown to evaluate the performance of the proposed approach.
    关键词:控制器;自适应控制;LQG;模糊控制器;容错控制系统
  • 51968.救护病人货厢设计调查报告

    [医药制造业,汽车制造业] [2014-07-29]

    NIST conducted a survey (Office of Management and Budget, Control No. 1090-0007) of the emergency medical services (EMS) professionals in December 2011. The objective of the survey is to aid in the development of design standards for the patient compartment in ambulances and to measure customer satisfaction with current design standards. A total of 2,537 responses were collected and provided insight into their work environment such as seating, occupancy, ergonomics, restraint systems, communications. The survey also provides information regarding their ability to perform in the patient compartment of ambulances such as the reach and usage of equipment and supplies. This report summarizes the quantifiable data collected from the survey responses. The survey supports a larger effort that is addressing performance and safety issues associated with the design of emergency medical services (EMS) vehicles, including the development of standards for the design of patient compartments in ambulances.
    关键词:救护车;患者;车厢;紧急医疗服务;医疗器械
  • 51969.全球微型电动车市场报告(2014-2018年)

    [汽车制造业] [2014-07-29]

    Micro electric vehicles are vehicles that have electric battery propulsion with a power rating between 4 kWh and 10 kWh, and they are generally two- to four-seater vehicles. This class of vehicles was earlier considered in the electric vehicles category, but as a result of the increased demand for micro electric vehicles and the rapid growth of the market, they are now considered as a category. The Micro Electric Vehicles market is classified into three segments: Quadricycles, Golf Carts, and Mobility Vehicles for the Disabled.
    关键词:微型电动汽车;额定功率;电池;四轮车;高尔夫球车;移动车辆
  • 51970.立体3D数字雷达显示在空中交通控制器的性能效果

    [汽车制造业,计算机、通信和其他电子设备制造业] [2014-07-29]

    Air traffic controllers are responsible for directing air traffic based upon decisions made from traffic activity depicted on 2Dimensional (2D) radar displays. Controllers must identify aircraft and detect potential conflicts while simultaneously developing and executing plans of action to ensure safe separation is maintained. With a nearly 100% increase in traffic expected within the next decade (FAA, 2012a), controllers’ abilities to rapidly interpret spacing and maintain awareness for longer durations with increased workload will become increasingly imperative to safety.
    关键词:控制器;立体;3D显示效果;数字雷达;空中交通控制器
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