Discussion
A damping ratio of exactly 1.0 in a longitudinal mode describes
Answer: D
A damping ratio of unity is critical damping: the two roots are real, equal and negative, and the aeroplane returns to trim as quickly as it can without overshooting. Below unity the motion oscillates, above it the aeroplane is overdamped and sluggish, which is why handling requirements put an upper bound as well as a lower one on short-period damping. An undamped oscillation is the zero-damping case. A divergence needs negative damping. And the boundary of static stability is set by the pitching moment derivative with incidence, not by a damping ratio.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development