Experimental determination of normal frequencies in coupled mechanical oscillator systems using fast Fourier transforms: An advanced undergraduate laboratory

1993 ◽  
Vol 61 (11) ◽  
pp. 1022-1027 ◽  
Author(s):  
Bernard J. Weigman ◽  
Helene F. Perry
Keyword(s):  
Experimental Determination ◽  
Fourier Transforms ◽  
Fast Fourier Transforms ◽  
Mechanical Oscillator ◽  
Undergraduate Laboratory

Detection of Higher Harmonics in a Slider Crank Mechanism of Variable Obliquity Ratio and its Use in the Determination of Displacement Transmissibility

2012 ◽  
Vol 40 (2) ◽  
pp. 146-159
Author(s):  
Devesh Kumar Jha ◽  
Santanu Das ◽  
A. Nandi ◽  
S. Neogy
Keyword(s):  
Finite Elements ◽  
Engineering Education ◽  
Experimental Work ◽  
Fourier Transforms ◽  
Fast Fourier Transforms ◽  
Higher Harmonics ◽  
Design And Manufacture ◽  
Theoretical Results ◽  
Crank Mechanism

The present paper deals with the design and manufacture of a slider crank mechanism with a variable obliquity ratio. It uses a double eccentric to serve this purpose. The slider crank mechanism can be operated at various speeds and different obliquity ratios. An accelerometer attached to the slider helps obtain its acceleration. The presence of higher harmonics is detected using fast Fourier transforms. The experimentally obtained values are compared with standard theoretical results. Further, a cantilever can be fixed to the slider under displacement excitation. Accelerations measured at the root and tip of the cantilever are used to calculate displacement transmissibility. The experimentally obtained values are compared with those obtained using finite elements. It is expected that such an approach will boost the interest of the students as it bridges theory with experimental work, which is so vital for engineering education.

Experimental determination of a state equation for dissipative granular gases

1999 ◽  
Vol 96 (6) ◽  
pp. 1111-1116 ◽  
Author(s):  
E. Falcon ◽  
S. Fauve ◽  
C. Laroche
Keyword(s):  
Experimental Determination ◽  
State Equation ◽  
Granular Gases

AN EXPERIMENTAL DETERMINATION OF ISOLATED BUBBLE ACOUSTICS IN A NUCLEATE BOILING SYSTEM

1974 ◽  
Author(s):  
G. E. Robinson ◽  
Frank W. Schmidt ◽  
H. R. Block ◽  
G. Green
Keyword(s):  
Experimental Determination ◽  
Nucleate Boiling
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