A new identification method is proposed to solve the problem of the influence on the loaded excitation signals brought by high feedback gain augmentation in lateral-directional aerodynamic parameters identification of...A new identification method is proposed to solve the problem of the influence on the loaded excitation signals brought by high feedback gain augmentation in lateral-directional aerodynamic parameters identification of fly-by-wire（FBW） passenger airliners. Taking for example an FBW passenger airliner model with directional relaxed-static-stability, through analysis of its signal energy distribution and airframe frequency response, a new method is proposed for signal type selection, signal parameters design, and the appropriate frequency relationship between the aileron and rudder excitation signals. A simulation validation is presented of the FBW passenger airliner＇s lateral-directional aerodynamic parameters identification. The validation result demonstrates that the designed signal can excite the lateral-directional motion mode of the FBW passenger airliner adequately and persistently. Meanwhile, the relative errors of aerodynamic parameters are less than 5%.展开更多
卵黄抗体(Immunoglobulin of yolk,IgY)因在水生动物疾病中具有被动免疫疗效而受到广泛的关注。本文综述了IgY基本结构和理化性质的研究进展,重点介绍了IgY在水生动物细菌和病毒感染防控、治疗中的潜在应用,为今后IgY的研究和水产养殖...卵黄抗体(Immunoglobulin of yolk,IgY)因在水生动物疾病中具有被动免疫疗效而受到广泛的关注。本文综述了IgY基本结构和理化性质的研究进展,重点介绍了IgY在水生动物细菌和病毒感染防控、治疗中的潜在应用,为今后IgY的研究和水产养殖中的应用提供参考。展开更多
Yuangang Village and Shipai Village in Tianhe District,Guangzhou City were taken for example to investigate living status and features of young migrant workers,and their satisfaction at living environment,dwelling nee...Yuangang Village and Shipai Village in Tianhe District,Guangzhou City were taken for example to investigate living status and features of young migrant workers,and their satisfaction at living environment,dwelling needs and willingness,on the basis of questionnaire survey and in-depth interview. According to comparative analysis of current situation and needs,housing problems of young migrant workers were summarized,and attentions in handling migrant workers' housing problems were given,i.e. diverse housing locations,beautifi cation of living environment,enriching housing types,equalization of public facilities,diverse housing supply modes.展开更多
文摘A new identification method is proposed to solve the problem of the influence on the loaded excitation signals brought by high feedback gain augmentation in lateral-directional aerodynamic parameters identification of fly-by-wire（FBW） passenger airliners. Taking for example an FBW passenger airliner model with directional relaxed-static-stability, through analysis of its signal energy distribution and airframe frequency response, a new method is proposed for signal type selection, signal parameters design, and the appropriate frequency relationship between the aileron and rudder excitation signals. A simulation validation is presented of the FBW passenger airliner＇s lateral-directional aerodynamic parameters identification. The validation result demonstrates that the designed signal can excite the lateral-directional motion mode of the FBW passenger airliner adequately and persistently. Meanwhile, the relative errors of aerodynamic parameters are less than 5%.
基金Sponsored by Outstanding Young Innovative Talent Cultivation Program of Guangdong Colleges and Universities(WYM11049)National Undergraduate Innovation and Entrepreneurship Training(1184512267)
文摘Yuangang Village and Shipai Village in Tianhe District,Guangzhou City were taken for example to investigate living status and features of young migrant workers,and their satisfaction at living environment,dwelling needs and willingness,on the basis of questionnaire survey and in-depth interview. According to comparative analysis of current situation and needs,housing problems of young migrant workers were summarized,and attentions in handling migrant workers' housing problems were given,i.e. diverse housing locations,beautifi cation of living environment,enriching housing types,equalization of public facilities,diverse housing supply modes.
