摘要
To study the dynamic characteristics and damping mechanism of impact-contact between the tips of blades further more,the impact-contact between the tips of a pair of blades was studied through numerical simulation.In this paper,the dynamic equation of contact-impact between the tips was established and Newmark direct integration method was adopted in numerical simulation.The nonlinear response characteristics and damping mechanism of impact-contact system are obtained.The results of numerical simulation were obtained as follows:As the clearance between blade shrouds is smaller,the vibration amplitude is smaller.The clearance between blade shrouds has a great influence on the input energy of the aerodynamic-excitation-vibration force.As the clearance of blade shrouds increases,the input energy of the aerodynamic-excitation-vibration force increases rapidly.
To study the dynamic characteristics and damping mechanism of impact-contact between the tips of blades further more, the impact-contact between the tips of a pair of blades was studied through numerical simulation. In this paper, the dynamic equation of contact-impact between the tips was established and Newmark direct integration method was adopted in numerical simulation. The nonlinear response characteristics and damping mechanism of impact-contact system are obtained. The results of numerical simulation were obtained as fol- lows： As the clearance between blade shrouds is smaller, the vibration amplitude is smaller. The clearance between blade shrouds has a great influence on the input energy of the aerodynamic-excitation-vibration force. As the clearance of blade shrouds increases, the input energy of the aerodynamic-excitation-vibration force increases rapidly.
