scholarly journals Proposition of a single-degree-of-freedom experimental modal analysis method considering the effect of mode components close to the target mode

2020 ◽  
Vol 86 (891) ◽  
pp. 20-00075-20-00075
Author(s):  
Daiki TAJIRI ◽  
Shinsuke TAKEHARA ◽  
Masami MATSUBARA ◽  
Shozo KAWAMURA
Keyword(s):  
Modal Analysis ◽  
Experimental Modal Analysis ◽  
Degree Of Freedom ◽  
Analysis Method ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Target Mode

Residual Vibration Criteria Applied to Multiple Degree of Freedom Cam Followers

1981 ◽  
Vol 103 (4) ◽  
pp. 702-705 ◽  
Author(s):  
J. L. Wiederrich
Keyword(s):  
Modal Analysis ◽  
Vibration Characteristics ◽  
Vibration Response ◽  
Degree Of Freedom ◽  
Operating Speed ◽  
Residual Vibration ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Cam Follower

The vibration characteristics of a cam motion are generally presented by plotting the single degree of freedom residual vibration as a function of normalized operating speed. In this paper it is shown that by applying the methods of modal analysis, these residual vibration characteristics can be extended to the characterization of the vibration response of a multiple degree of freedom cam follower system.

A Simplified Analysis Method for Elasto-Plastic Seismic Response Using the Energy Balance Equation of a Maximum Hysteresis Loop

2015 ◽  
Author(s):  
Gaku Nakamura ◽  
Yukihiko Okuda ◽  
Shoichi Ebato ◽  
Hiroshi Niwa ◽  
Tadashi Iijima ◽  
...  
Keyword(s):  
Energy Balance ◽  
Seismic Response ◽  
Degree Of Freedom ◽  
Integration Scheme ◽  
Analysis Method ◽  
Maximum Displacement ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Simplified Analysis ◽  
Vibration Tests

With increasing magnitude of design earthquake ground motions, it is necessary to develop methods of evaluating the seismic safety margin that are more exact than the current methods. However, a standard nonlinear analysis method requires step by step calculations of the numerical time integration scheme to obtain the seismic response. The authors present a new simplified analysis method of elasto-plastic seismic response. The proposed method is formulated by the energy balance between the input energy and the dissipated energy of an equivalent single degree of freedom model for actual equipment. Assuming the harmonic resonance of the single degree of freedom model, the maximum displacement response can be estimated conservatively. To verify the proposed method, static tests and vibration tests with cantilever-type specimens were performed. The vibration tests were conducted with sine, sweep down sine and random waves to verify the conservativeness of the proposed method. Comparisons of the maximum displacement between the tests and the proposed method show the conservative estimation of the displacement by the proposed method.

scholarly journals Modal analysis of a stator of Double Rotor Traveling Wave Rotary Ultrasonic Motor (DTRUM) (Single Degree of Freedom)

2014 ◽  
Vol 11 (2) ◽  
pp. 71-75
Author(s):  
Abdulrahaman Shuaibu Ahmad ◽  
◽  
Prof. Dr. Qing He ◽  
Abdulrrahman Ahmad Umar ◽  
Saidu Bello Abubakar
Keyword(s):  
Modal Analysis ◽  
Traveling Wave ◽  
Ultrasonic Motor ◽  
Degree Of Freedom ◽  
Single Degree Of Freedom ◽  
Single Degree
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