Limitations of autopilot design for controlling a statically unstable flexible interceptor

The Mach number, angle of attack and altitude of operation for an interceptor vary widely during the course of its trajectory. As a result, the interceptor Center of Pressure (CP) locations move significantly around a given Center of Gravity (CG) location at these operating conditions. This results...

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Bibliographic Details
Published inJournal of the Franklin Institute Vol. 358; no. 12; pp. 6121 - 6135
Main Authors Sankar, Ram B., Tiwari, Pawan Kishore, Bandyopadhyay, Bijnan, Arya, Hemendra
Format Journal Article
LanguageEnglish
Published Elmsford Elsevier Ltd 01.08.2021
Elsevier Science Ltd
Subjects
Aerodynamic configurations
Aerodynamic stability
Aerodynamics
Angle of attack
Automatic pilots
Bearings
Center of gravity
Center of pressure
Configuration management
Control stability
Design
Flexibility
Gravity
Mach number
Static stability
Studies
Vibration
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Summary:The Mach number, angle of attack and altitude of operation for an interceptor vary widely during the course of its trajectory. As a result, the interceptor Center of Pressure (CP) locations move significantly around a given Center of Gravity (CG) location at these operating conditions. This results in an inevitable variation in aerodynamic static stability leading to stable and unstable operating regions. In order to ensure good speed of response during the interceptor homing phase, lesser static stability is desirable. Hence the requirement to handle aerodynamic instability at some other operating conditions in the interceptor envelope become inevitable. Since flexibility has a strong bearing on autopilot design, it becomes necessary to control unstable operating points in the presence of flexibility modes. Despite the static stability variation, aerodynamic design can control the level of maximum instability of the configuration. Hence the maximum static instability the autopilot can handle has to be specified for aerodynamic configuration design. This paper brings out the limitations of autopilot design in controlling an unstable interceptor with low bending mode frequencies in terms of maximum instability the autopilot design can handle, which serves as an important input for aerodynamic design.
ISSN:0016-0032
1879-2693
0016-0032
DOI:10.1016/j.jfranklin.2021.06.002