1. Depending on the damping ratio adjusting, the low measurement range and the frequency response was realized.

2. The damping ratio of the overall structure of Tianxinzhou Bridge is unknown, because the structure of the bridge is composed by reinforced concrete structure and steelwork structure.

3. The damping ratio is an important characteristic parameter in a second-order system, which has great effect on the dynamic characteristic of the second order system.

4. The design curves of equivalent damping ratio to the brace stiffness, and ratio of maximum damping force of the damping device to the inter-story yield shear force of the structure are proposed.

5. The calculation formulas to effective damping ratio suitable for two kinds of seismic reduction considerations, as well as displacement based calculation formulas are studied.

6. Also, spin rate coupling with structural damping ratio and other structural parameters have a significant influence in aeroelastic dynamic instability for spinning rocket.

7. The design spectrum is modified accommodating the effective damping ratio, so the seismic load of semi- rigidly connected steel frame can be determined.

8. The influences of damping ratio, slamming rate and coefficient of correlation on the reliability were studied, and the reliabilities of various failure modes were analyzed.

9. The damping ratio of the structure is regarded as Rayleigh damping ratio in this method.

10. Eigenfrequency, vibration pattern and damping ratio can be got by modal experiment. Then, these parameters can be used to structural design and optimization.

11. Damping ratio is the main index representing the property of materials in reducing vibration.

12. The effect of stiffness constant, viscosity damper coefficient and variable mass on the damped frequency and the relative damping ratio of the system were studied.

13. The study indicates that the disorder of dry friction can significantly increase the resonant response of bladed disks, especially in the system with weaker coupling and larger viscous damping ratio.

14. Through the optimum searching, one may obtain the optimum frequency spacing, average damping ratio, tuning frequency ratio, and corresponding index representing the control effectiveness of MTMD.

15. The optimum parameters include the optimum frequency spacing, average damping ratio, and tuning frequency ratio.

16. The system's global characters are obtained under different input torque fluctuation, backlash, composite transmission error, exciting frequency and damping ratio.

17. The normalized form of shear modulus vs. strain amplitude will be shown by a single curve, and that of damping ratio vs. strain amplitude by a family of curves or a band zone with shrunk ends.

18. With the hysteretic hoops acquired from the experiment, the effective damping ratio of the joint, with which its energy dissipation can be weighted, was calculated.

19. The low - noise wheel has low stiffness and a high - damping ratio compared to a solid wheel.

20. The correspondence between viscous damping and hysteretic damping models was explained, which lays a basis for evaluating damping ratio of structural control element under major earthquake.

21. By comparison with other method given here reveals a better algorithmic damping ratio, a lesser relative periodic ratio error, and no overshooting.

22. The dynamic behaviour of the pile is presented as frequency response curves for displacement, stiffness, dashpot constant and damping ratio.

23. The results showed that the fluctuating amplifying coefficient evidently reduces with the increase of damping ratio.

24. The definition designing procedure of torsion rigidity and the shock absorber damping based on the settled biased frequency and relative damping ratio is presented.

25. Through the optimum searching, the optimum frequency spacing, average damping ratio, tuning frequency rat io and corresponding index measuring the control effectiveness of MTMD could be obtained.

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26. However, the LT-TMD needs higher optimum tuning frequency ratio and lesser optimum damping ratio with reference to the TMD.

27. It is not consistent with damping mechanism and full - scale data of damping ratio of buildings.

28. The results show that the equivalent stiffness and the equivalent viscous damping ratio of lead-core rubber damper vary little with loading frequency.

29. Main effect factors on the power factor of driving motor used for linear compressor were analyzed to ensure high motor performance, including radian frequency ratio and damping ratio.

30. The value of gain constant K may be calculated analytically for given damping ratio, thereby root-locus curves with various K may be plotted analytically.

31. The negative - velocity feedback strategy and the optimization criterion of equivalent damping ratio are adopted.

32. Third, a new structure of PID control reduces the damping ratio of the control system.

33. At last, suggestions of suitable effective damping ratio of that structure is put forward.

34. It was concluded that the effects of peak pulse acceleration, pulse duration, angle of tilted support spring and damping ratio of the system are particularly noticeable.