• Rotor-dynamics-focused pattern examining vibration in rotating shafts, unbalanced rotors, bearings, and blade/aeroelastic effects; emphasis on balancing, rotor instability, and wake-induced vibrations in rotating machinery [1], [3], [4], [9], [13], [20].

• Structural-dynamics pattern analyzing vibrational modes in plates, shells, and thin-walled beams, including open cross sections and acoustic coupling; focuses on modal behavior, coupling, and eigenmode shaping in structural elements [12], [17], [18], [19].

• Damping and relaxation phenomena: dissipation mechanisms and vibrational energy relaxation in materials and tribosystems; integrates dislocation damping, collisional relaxation, and friction-heating contexts [5], [10], [11].

• Nonlinear dynamics and active control strategies: nonlinear vibration, steady-state nonlinear absorbers, and active vibration control concepts across rotating and structural systems [1], [13], [15], [19].