High-frequency vibration of a conformal antenna structure

Chen, X; Tang, Yong-Woong; Liu, Ling; Zhao, Minghui; Punyamurtula, Venkata K.; Chen, J; Han, Aijie; Qiao, Y

doi:10.1243/09544100jaero268

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…The actual research provided by other authors is primarily focused on the mechanical vibrations of antennas (antenna arrays) or microstrip antennas caused by the movement of the object or originating from propulsors (UAV propellers) [18,39,40]. Other authors are investigating vibrations of antennas as a part of aircraft structure excited from outside electromagnetic sources but in high-frequency bands (30 MHz) [41].…”

Section: Discussionmentioning

confidence: 99%

Unwanted Supplementary Vibrations of Helicopter Radio Communication Systems

et al. 2023

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A helicopter in flight can be considered an unstable dynamic system with many unwanted vibrations originating from multiple sources, such as the operation of the engines and individual components. These vibrations cause the degradation of the structural and functional components of a helicopter, thereby generally reducing the utility and technical efficiency of the aircraft. During the analysis of frequently recurring errors of medium-heavy helicopters, partial damage to antenna elements with vertical polarisation was detected. These damages provided the basis for the presented research, based on which supplementary vibrations caused by unwanted electromagnetic oscillations were revealed. These oscillations were detected in the process of communication between the helicopter crew and the ground ATC (air traffic control) station. This phenomenon’s existence and negative influence were confirmed via measurements and modal analysis, based on which an exact synergy between harmonic frequencies of the helicopter’s normal vibrations was discovered. The obtained results serve as a theoretical and practical basis for the future monitoring of this phenomenon, especially in the process of determining the “health status” of medium-heavy helicopters.

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Section: Discussionmentioning

confidence: 99%

Unwanted Supplementary Vibrations of Helicopter Radio Communication Systems

et al. 2023

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“…If this is smaller than about 30 MHz, the corresponding antenna must have a few metres. Thus a possibility is to use a part of the airframe, the wing for example, as material substrate for this purpose [155].…”

Section: Navigation and Communicationmentioning

confidence: 99%

Aeronautics and astronautics: Recent progress and future trends

Martínez‐Val

Pérez

2009

Proceedings of the Institution of Mechanical Engineers, Part C:

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Aeronautics and astronautics are two closely related disciplines, sometimes found under the joint term aerospace, that have progressed at a formidable pace during the 20th century. Their impact on society is overwhelming. For example, the aeroplane, the core of aeronautics, has been identified as one of the three major inventions of that century. On its turn, satellites have paved the way for modern globalization. Major drivers leading this progress have changed from the classical motto ‘higher, further, faster’ to the current ‘more affordable, cleaner, quieter’, but safety has always been kept the undisputed number one. The underlying key factors for progress have been and still are excellence and co-operation. Both aeronautics and astronautics are multidisciplinary in nature and, accordingly, this review summarizes relevant advances and trends in pertinent fields: aerodynamics, structures, propulsion, and so on. All these fields are still very healthy and the 21st century will witness again a new era of astonishing aerospace developments.

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“…Therefore, micro-vibrations are significant factors that reduce the resolution of the payloads and affect the satellite missions. [1][2][3][4] During satellite operation, owing to the numerous vibration sources and the coupling movement between the various components, the transfer path of the vibration is extremely complicated. The vibration energy transmitted on each path is not the same, 5 which can result in a different level of vibration on the payload.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, micro-vibrations are significant factors that reduce the resolution of the payloads and affect the satellite missions. 1–4…”

Section: Introductionmentioning

confidence: 99%

Kalman filter identification method for micro-vibration transfer paths of satellites

Shen

Yang

Sheng

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part G:

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Micro-vibrations on-board a satellite have degrading effects on the performance of certain payloads like observation cameras. The major sources of vibrations include momentum wheels, solar array drives, other rotary mechanical equipment, etc. These vibrations result in loss of the pointing precision and image quality of the payload through intricate transfer paths. To improve the accuracy of a satellite system with many vibration sources and complex transfer paths, it is necessary to determine the main transfer path of vibration. In this study, a path identification method is proposed and applied to the transfer system from the momentum wheel to the camera mount. First, the observer/Kalman filter identification (OKID) algorithm is used to acquire the state-space equation of each path subsystem. Then, the subsystem order is obtained based on the slope of the singular entropy increment. In the next phase, combined with the measured disturbance force of the momentum wheel, the displacement response of the target point is predicted. Finally, the dominant transfer path of vibration is achieved by calculating the vibration contribution of each path to the response point. The results indicate that the dominant transfer path is the axial path of the horizontal momentum wheel, which contributes to the vibration of the camera mount at most. Effective vibration reduction measures should be taken to this path to suppress the vibration signal. In comparing the identified displacement response with the finite element response of the camera mount under different noise conditions, the correlation coefficients are >0.85, which proves the accuracy and anti-noise capability of the identification method.

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High-frequency vibration of a conformal antenna structure

Cited by 5 publications

References 8 publications

Unwanted Supplementary Vibrations of Helicopter Radio Communication Systems

Unwanted Supplementary Vibrations of Helicopter Radio Communication Systems

Aeronautics and astronautics: Recent progress and future trends

Kalman filter identification method for micro-vibration transfer paths of satellites

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