OPTIMAL DESIGN OF A DYNAMIC VIBRATION ABSORBER BASED ON THE MODIFIED CAMEL ALGORITHM AND PHYSICAL CONCEPTS
DOI:
https://doi.org/10.11113/jurnalteknologi.v88.22957Keywords:
Absorber, optimal design, camel algorithm, negative stiffness, negative massAbstract
This study provides an optimal design of a dynamic vibration absorber used for vibration attenuation for a wide range of real world applications. Principles of negative mass and stiffness are adopted and explained in detail in the mathematical modeling. Then, harmonic analysis is used to obtain the dynamic response of the absorber in terms of main system amplitude and resonance frequency. Based on the dynamic response, the modified Camel algorithm is used to obtain the optimal values of absorber in terms of some properties, damping and mass ratio. For several mass ratio scenarios, the ideal damping and frequency ratios are concurrently established. The results showed that damping ratios are very critical and important factors, even for a very small uncertainty. Damping by adding DVA changed the nonlinear harmonic response. The critical values of both damping ratio and frequency ratio must be carefully chosen because they are not independent. But when the frequency ratio increase, the behavior changes. Reducing the amplitude response by 400% involved increasing the DR from (0.1 to 0.4). Changes in the mass ratio and frequency have no effect on the amplitude response when Ω < 0.25. The response is only impacted by frequency ratio in the range of (0.5< Ω <1.5). Finally, the modified camel algorithm successfully, precisely, and economically determined the optimal design of the critical design parameters of the absorber. The optimal values of the design parameters are compared to some available method in literature and the results are more satisfied and precisely predicte.
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