Fast level-flight to hover mode transition and altitude control in tiltrotor’s landing operation

来源 :中国航空学报(英文版) | 被引量 : 0次 | 上传用户:hbhszs
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
An attempt is made to implement a faster level-flight to hover mode transition in tiltro-tor’s landing process for the purpose of shortening its landing time. A three-stage tiltrotor landing maneuver is designed, and corresponding control modules and algorithms are created based on the analysis of the flight dynamics and the required actions of tiltrotor’s landing operation. As the alti-tude control is vital for tiltrotor’s near-ground landing, an Extended State Observer (ESO) control module of the Active Disturbance Rejection Control (ADRC) is designed to reduce altitude fluctu-ations in the fast mode transition, which makes the designed maneuver workable at very low alti-tudes. Simulations are conducted to verify the effectiveness of the designed maneuver and the validity of ESO control in various flight conditions. Flight test results that finally prove the effec-tiveness of the desired fast transition maneuver are reported.
其他文献
用多聚酶链式反应法检测注射器HBV污染情况张常然,宁宜云(湖北医科大学附属第二医院武汉430071)目前多以检测乙型肝炎表面抗原(HBsAg)阳性代表乙型肝炎病毒(HBV)的污染。因HBsAg存于HBV外壳并且无传染性,HBVDNA为HBV的遗
目的:观察小针刀治疗强直性脊柱炎肌腱附着点炎的疗效.方法:选择强直性脊柱炎伴肌腱附着点炎患者80例,随机分两组各40例,治疗组运用强脊宁一号汤+小针刀治疗,对照组用强脊宁
本文通过分析水针刀松解椎管内外的软组织以及恢复力学平衡的机理,探讨了针刀松解同时药物注射、药液静滴及内服中药的药理机制。结合相关病例,采用水针刀法配合中药治疗腰椎间
目的 观察水针刀微创针法配合倒挂与冯氏定点旋转复位治疗腰椎间盘突出症的临床效果.方法 对206名腰椎间盘突出症患者,进行水针刀微创针法法配合倒挂与冯氏定点旋转复位进行
【摘 要】生鲜连锁超市的发展是农贸市场一个内容和形式上的较为完整的发展趋势,在这个发展过程中,生鲜连锁超市面临着不同的挑战和机遇,但凭借自身的优势在不断的改善中会逐渐的发展壮大,本文将结合生鲜连锁超市的现状、优势以及面临挑战,从选址、经营理念以及供应链优化几方面提出生鲜连锁超市的发展策略。  【关键词】生鲜连锁超市;现状;发展  生鲜超市是以超市的形式经营生鲜农副产品,超市有空调、冷藏保鲜柜以及一
The reliability of an Engine Electronic Controller (EEC) attracts attention, which has a critical impact on aircraft engine safety. Reliability assessment is an
Aerodigestive cancer, like esophageal cancer or head and neck cancer, is well known to have a poor prognosis. It is often diagnosed in the late stages, with dys
这是因为矽尘作业工人吸入矽尘后,矽尘刺激肺组织引起肺内巨噬细胞的增生,巨噬细胞大量地吞噬矽尘,矽尘的溶解产物导致巨噬细胞的死亡、崩溃,释放出有毒的细胞液和残余的矽
目的:探讨射频靶点热凝两种不同温度周期治疗椎间盘突出症临床疗效的对比.方法:回顾性分析射频靶点热凝治疗椎间盘突出症100例患者的临床疗效,其中采用70°1分钟、80°1分钟
会议
目的:观察射频靶点消融术后臭氧盘内注射联合桃红四物汤治疗腰椎间盘突出症的疗效.方法:将480例腰椎间盘突出症患者进行射频靶点消融、臭氧介入联合桃红四物汤治疗,采用视觉