tailieunhanh - Aircraft Design - Systhesis anh Analysis 2008 Part 9

Tham khảo tài liệu 'aircraft design - systhesis anh analysis 2008 part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | compute the combined drag of the system. Dynamic Stability The evaluation of static stability provides some measure of the airplane dynamics but only a rather crude one. Of greater relevance especially for lateral motion is the dynamic response of the aircraft. As seen below it is possible for an airplane to be statically stable yet dynamically unstable resulting in unacceptable characteristics. Just what constitutes acceptable characteristics is often not obvious and several attempts have been made to quantify pilot opinion on acceptable handling qualtities. Subjective flying qualities evaluations such as Cooper-Harper ratings are used to distinguish between good-flying and difficult-to-fly aircraft. New aircraft designs can be simulated to determine whether they are acceptable. Such real-time pilot-in-the-loop simulations are expensive and require a great deal of information about the aircraft. Earlier in the design process flying qualities estimate may be made on the basis of various dynamic characteristics. One can correlate pilot ratings to the frequencies and damping ratios of certain types of motion as in done in the . Military Specifications governing airplane flying qualities. The figure below shows how the short-frequency longitudinal motion of an airplane and the load factor per radian of angle of attack are used to establish a flying qualities estimate. In Mil Spec 8785C level 1 handling is considered clearly adequate while level 3 suggests that the airplane can be safely controlled but that the pilot workload is excessive or the mission effectiveness is .

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