Random vibration analysis of an optomechanical system mounted on an air platform

Download

MS_thesis.pdf

Date

2022-8-18

Author

Yalçın, Ege

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

327
views

604
downloads

Vibrations in operating environment cause unwanted motion of the optical components of an optomechanical system mounted on air platform, downgrading its performance. This performance reduction is described by two optical parameters, namely, line-of-sight jitter and reduction in modulation transfer function (MTF). However, relatively few studies have been conducted on the prediction of these parameters, forcing engineers to rely on experimental data obtained from the physical model. By the time optomechanical system design is already completed and its physical model is manufactured, it usually proves to be expensive to apply any necessary changes to improve vibration performance. Amplitude of a random vibration signal cannot be foreseen and predicted exactly. It behaves like a combination of many sinusoidal signals with differing frequencies and phases, which is a model of real-life operational conditions. Subjected to a stationarity test, Fourier transform is applied to this signal while it can be considered as a single PSD profile with a particular spectral energy distribution over frequency range of interest. In this study, it is first verified that the time domain acceleration data acquired from the operating environment is stationary. Secondly, a finite element analysis model of the optomechanical system of concern is constructed. Then, using the results of the finite element analysis, the two optical parameters are calculated by a specialized analysis software. The calculated MTF reduction is tried to be verified through experimental measurements. Thus, it is aimed to predict MTF reduction accurately by using the appropriate simulation software at early stages of a project.

Subject Keywords

Random vibration, Optomechanical system, Modulation transfer function, Line-of-sight, Jitter

URI

https://hdl.handle.net/11511/98742

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Dynamic modeling of optical systems in order to study vibration effect on performance Avsar, Ahmet Levent; Özgüven, Hasan Nevzat (2010-08-03) In order to determine the vibration effects on performance in optical system, a simple vibratory model is proposed. The model suggested is compared with FE model. Both models are validated by modal tests for an existing simple optical system. The material properties of adhesive, which play an imported role in the vibratory model of an optical system, are found experimentally by using a simple test setup. The model suggested is used to investigate the dynamic behavior of the optical system under random vibra...
Real-time coordination and routing in wireless sensor and actor networks Shah, Ghalib A.; Bozyigit, Muslim; Akan, Ozgur B.; Baykal, Buyurman (2006-01-01) In Wireless Sensor Actor Networks (WSAN), sensor nodes perform the sensing task and actor nodes take action based on the sensed phenomena in the field. To ensure efficient and accurate operations of WSAN, new communication protocols are imperative to provide sensoractor coordination in order to achieve energy-efficient and reliable communication. Moreover, the protocols must honor the application-specific real-time delay bounds for the effectiveness of the actors in WSAN.
Analysis of vision aided inertial navigation systems Yuksel, Yigiter; Kaygisiz, H. Burak (2006-04-19) We propose in this paper a method to integrate inertial navigation systems with electro optic imaging devices. Our method is based on updating the inertial navigation system in a Kalman filter structure using line of sight measurements obtained from a camera. The proposed method is analyzed based on a UAV scenario generated by our trajectory simulator and the results are provided here. The results show that even a single vision aid can improve the performance of inertial navigation system.
Investigation of Stockbridge dampers for vibration control of overhead transmission lines Kasap, Hüseyin; Özgen, Gökhan Osman; Department of Mechanical Engineering (2012) This thesis aims to examine the performance of Stockbridge dampers used to suppress aeolian vibrations on overhead transmission lines arising from the wind. In this respect, a computer program, based on the Energy Balance Method, is developed using MATLAB. The developed computer program has also a graphical user interface (GUI), which allows the program to interactively simulate Stockbridge damper performance for vibration control of overhead transmission lines. Field tests results obtained from literature ...
Dynamic analysis of CMUTs in different regimes of operation Bayram, Barış; Ergun, AS; Yaralioglu, GG; Khuri-Yakub, BT (2003-01-01) This paper reports on dynamic analysis of an immersed single capacitive micromachined ultrasonic transducer (CMUT) cell transmitting. A water loaded 24 mum circular silicon membrane of a transducer was modeled. The calculated collapse and snapback voltages were 80 V and 50 V, respectively. The resonance frequency, output pressure and nonlinearity of the CMUT in three regimes of operation were determined. These regimes were: a) the conventional regime in which the membrane does not make contact with the subs...

Citation Formats

E. Yalçın, “Random vibration analysis of an optomechanical system mounted on an air platform,” M.S. - Master of Science, Middle East Technical University, 2022.