Model based forward design of six degrees of freedom vibration isolator for aviation optoelectronic platform

As the core component of aviation optoelectronic equipment, vibration isolator plays a crucial role in attenuating high frequency mechanical vibrations from airborne platforms, thereby ensuring the clarity and stability of the optoelectronic imaging system. This paper presents what we believe to be a novel six degrees of freedom vibration isolator (SDFVI) and introduces its forward design methodology tailored to meet the high frequency attenuation requirements all six degrees of freedom in aviation optoelectronic system. Initially, a SDFVI is proposed based on the Stewart platform principle, which exhibits elastic characteristics in both translational and rotational directions. Subsequently, the relationship between the characteristic parameters (stiffness and damping) of the SDFVI and its design parameters is established. Furthermore, the dynamic equation of six degrees of freedom isolation system, comprising the aviation optoelectronic device and the SDFVI, is derived by using the Newton-Euler formula. This derivation constructs a comprehensive mapping from the isolator design parameters to the isolation performance characteristics. Additionally, a forward design methodology for the SDFVI is summarized, enabling the rapid determination of isolator design parameters within specified constrains domain. Finally, a practical example is given and the effectiveness of the method proposed in the paper is validated through dynamic experiment. The results show that the SDFVI achieves a linear vibration isolation rate of about 97% above 15 Hz, while the RMS values of the coupled angular responses about the other two axes are 7.4 µrad and 8.1 µrad. This indicates that the SDFVI can meet the requirements with a single production run and improve the design efficiency. The methodology outlined in this paper offers a valuable reference for the design of vibration isolator in aviation optoelectronic platform.