Line-of-sight stabilization of a gimbaled mechanism under passive base isolation

Kandemir, Kutlu Demir
Akmese, Alper
Yazıcıoğlu, Yiğit
Line-of-sight stabilization is an important concept for aerospace applications utilizing gimbaled imaging systems. A widely used method for protecting the line-of-sight stabilization system from the disturbing effects of the base vibrations is to mount it on passive vibration isolators. However, these isolators may interact with gimbal controller and drastically limit the stabilization performance. This work deals with line-of-sight stabilization problem in aerospace structures by focusing on the parameters of controller and vibration isolation system. The problem is investigated on an experimental setup for a specific case. Several performance tests are applied on the setup and a relation between isolation parameters and controller bandwidth is obtained. The results are used to generate design constraints.


Dynamic modelling and control of a gimballed airborne antenna platform with mass unbalance and friction
Şeref, Tuğçe; Leblebicioğlu, Mehmet Kemal; Department of Electrical and Electronics Engineering (2018)
Inertial stabilized gimballed systems are widely-used in many applications to achieve a high precision positioning. Airborne antennas pointing target as a part of the satellite communication may be examples of such systems. This thesis presents the dynamic modelling and control of a two axes gimballed airborne antenna platform. First, reference frames and the transformation matrices are defined to build up the motion of the antenna and kinematic equations of each gimbal are derived. Next, the dynamic equati...
Cogging Torque Disturbance Rejection for a Low-cost Gimbal Motor and a Controller Design with Practical Considerations
Ozdogan, Gokhan; Leblebicioğlu, Mehmet Kemal (2019-01-01)
In many robotic applications and inertially stabilized electro-optic gimbal systems, precise positioning and speed control are highly important concepts. Due to size and weight limitations, motor is required to be small but torque density is desired to be high. In high torque and cheap PMSM and BLDC motors, cogging torque and friction are usually the challenging disturbance sources. In this study, cogging torque and friction are identified using position sensors which already exist in gimbal systems, so the...
Kayastha, Sharmila; Tekinalp, Ozan; Ozgoren, Kemal (2010-02-18)
A control system is designed to improve the pointing performance of a large Earth observation camera carried by a spacecraft. The spacecraft camera is mounted to the spacecraft thorough active truss members. The control system uses a cluster of reaction wheels together with piezoelectric struts. The improvement in the pointing performance using this dual actuator system is demonstrated through simulations.
Real-time imaging of vortex-antivortex annihilation in Bi2Sr2CaCU2O8+delta single crystals by low temperature scanning hall probe microscopy
Dede, M; Oral, Ahmet; Yamamoto, T; Kadowaki, K; Shtrikman, H (2006-03-01)
Vortices in superconductors play an important role in operating limits and applications of the superconductors. Scanning Hall probe microscopes have proven themselves to be quantitative and non-invasive tools for investigating magnetic samples down to 50 nm scale. Penetration of vortices in high quality single crystal Bi2Sr2CaCu1O8+delta superconductor has been studied in real-time with single vortex resolution at 77 K using a low temperature scanning Hall probe microscope (LT-SHPM). Vortices have been obse...
High operating temperature mid-wave infrared HgCdTe photodiode design
Yurtseven, Eray; Kocaman, Serdar; Department of Electrical and Electronics Engineering (2019)
Infrared focal plane arrays are critical components in many of the military and civilian applications for advanced imaging systems. HgCdTe is one of the most widely used infrared detector material. An important issue with this material for thermal imaging system is the operating temperature as it determines cryocooler crucial characteristics, namely power comsumption and device lifetime. Therefore, there is an effort towards to operate at higher temperatures, but performance characteristics need to be caref...
Citation Formats
K. D. Kandemir, A. Akmese, and Y. Yazıcıoğlu, “Line-of-sight stabilization of a gimbaled mechanism under passive base isolation,” PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING, pp. 35–43, 2014, Accessed: 00, 2020. [Online]. Available: