This paper gives performance analysis of a three phase Permanent Magnet Synchronous Generator (PMSG) connected to a Vertical Axis Wind Turbine (VAWT). Low speed wind condition (less than 5 m/s) is taken in considerati...This paper gives performance analysis of a three phase Permanent Magnet Synchronous Generator (PMSG) connected to a Vertical Axis Wind Turbine (VAWT). Low speed wind condition (less than 5 m/s) is taken in consideration and the entire simulation is carried in Matlab/Simulink environment. The rated power for the generator is fixed at 1.5 KW and number of pole at 20. It is observed under low wind speed of6 m/s, a turbine having approximately1 mof radius and2.6 mof height develops 150 Nm mechanical torque that can generate power up to 1.5 KW. The generator is designed using modeling tool and is fabricated. The fabricated generator is tested in the laboratory with the simulation result for the error analysis. The range of error is about 5%-27% for the same output power value. The limitations and possible causes for error are presented and discussed.展开更多
针对半球共形阵体制下进行低空风切变检测时会受到强地杂波信号的干扰,导致风切变信号难以检测的问题,提出了一种基于空时自回归的直接数据域算法(Space-Time Autoregressive Direct Data Domain,D3AR)的低空风切变风速估计方法。该方...针对半球共形阵体制下进行低空风切变检测时会受到强地杂波信号的干扰,导致风切变信号难以检测的问题,提出了一种基于空时自回归的直接数据域算法(Space-Time Autoregressive Direct Data Domain,D3AR)的低空风切变风速估计方法。该方法首先将待检测距离单元的数据从空域、时域以及空时域进行信号对消处理;然后将处理后的数据矩阵描述为空时自回归(Autoregression,AR)模型并估计模型参数;再通过构造与杂波子空间正交的空间来实现对杂波的抑制,最后通过提取待检测单元的最大多普勒频率来估计风场速度。根据仿真结果显示,该方法有效地实现了地杂波抑制,并且能够精确估计风速。展开更多
现代民用飞机须严格按照适航规章要求进行设计,国内现代民用飞机的气动弹性设计参照的适航条款主要为CCAR25.629条款"气动弹性稳定性要求"和咨询通报AC25.629-1A"Aeroelastic Stability Substantiation of Transport Cat...现代民用飞机须严格按照适航规章要求进行设计,国内现代民用飞机的气动弹性设计参照的适航条款主要为CCAR25.629条款"气动弹性稳定性要求"和咨询通报AC25.629-1A"Aeroelastic Stability Substantiation of Transport Category Airplane"。低速颤振模型风洞试验是飞机气动弹性设计中的一种有效技术手段,用以摸清飞机的亚音速颤振特性、影响颤振特性的敏感参数及其影响规律,并验证理论分析结果;低速颤振模型风洞试验同时也是民用飞机适航符合性的一种验证方法,用以表明飞机气动弹性设计的适航符合性。结合某型号飞机研制经验对民用飞机低速颤振模型风洞试验的适航符合性验证技术进行探讨研究,提出了切实可行的民用飞机低速颤振模型风洞试验适航符合性设计和验证方案。展开更多
描述一种适用于MAV(M icro A ir Veh ic le)低速风洞实验的模型支架;重点介绍该模型支架的结构、工作原理、标定方法、误差影响以及实际使用的效果。本模型支架结构简单,尺寸小,操作方便,成本低。实验表明,该模型支架能更好地满足MAV的...描述一种适用于MAV(M icro A ir Veh ic le)低速风洞实验的模型支架;重点介绍该模型支架的结构、工作原理、标定方法、误差影响以及实际使用的效果。本模型支架结构简单,尺寸小,操作方便,成本低。实验表明,该模型支架能更好地满足MAV的实验研究。展开更多
文摘This paper gives performance analysis of a three phase Permanent Magnet Synchronous Generator (PMSG) connected to a Vertical Axis Wind Turbine (VAWT). Low speed wind condition (less than 5 m/s) is taken in consideration and the entire simulation is carried in Matlab/Simulink environment. The rated power for the generator is fixed at 1.5 KW and number of pole at 20. It is observed under low wind speed of6 m/s, a turbine having approximately1 mof radius and2.6 mof height develops 150 Nm mechanical torque that can generate power up to 1.5 KW. The generator is designed using modeling tool and is fabricated. The fabricated generator is tested in the laboratory with the simulation result for the error analysis. The range of error is about 5%-27% for the same output power value. The limitations and possible causes for error are presented and discussed.
文摘针对半球共形阵体制下进行低空风切变检测时会受到强地杂波信号的干扰,导致风切变信号难以检测的问题,提出了一种基于空时自回归的直接数据域算法(Space-Time Autoregressive Direct Data Domain,D3AR)的低空风切变风速估计方法。该方法首先将待检测距离单元的数据从空域、时域以及空时域进行信号对消处理;然后将处理后的数据矩阵描述为空时自回归(Autoregression,AR)模型并估计模型参数;再通过构造与杂波子空间正交的空间来实现对杂波的抑制,最后通过提取待检测单元的最大多普勒频率来估计风场速度。根据仿真结果显示,该方法有效地实现了地杂波抑制,并且能够精确估计风速。
文摘现代民用飞机须严格按照适航规章要求进行设计,国内现代民用飞机的气动弹性设计参照的适航条款主要为CCAR25.629条款"气动弹性稳定性要求"和咨询通报AC25.629-1A"Aeroelastic Stability Substantiation of Transport Category Airplane"。低速颤振模型风洞试验是飞机气动弹性设计中的一种有效技术手段,用以摸清飞机的亚音速颤振特性、影响颤振特性的敏感参数及其影响规律,并验证理论分析结果;低速颤振模型风洞试验同时也是民用飞机适航符合性的一种验证方法,用以表明飞机气动弹性设计的适航符合性。结合某型号飞机研制经验对民用飞机低速颤振模型风洞试验的适航符合性验证技术进行探讨研究,提出了切实可行的民用飞机低速颤振模型风洞试验适航符合性设计和验证方案。
