Experimental verification of resonant frequencies and vibration behaviour of stators of electrical machines. Part 1: Models, experimental procedure and apparatus

1981 ◽  
Vol 128 (1) ◽  
pp. 12 ◽  
Author(s):  
S.P. Verma ◽  
R.S. Girgis
Keyword(s):  
Experimental Verification ◽  
Electrical Machines ◽  
Resonant Frequencies ◽  
Experimental Procedure

scholarly journals An experimental verification of Newton's second law

2013 ◽  
Vol 35 (2) ◽  
pp. 1-5
Author(s):  
Roberto Hessel ◽  
Saulo Ricardo Canola ◽  
Dimas Roberto Vollet
Keyword(s):  
Single Crystal ◽  
Experimental Verification ◽  
Experimental Arrangement ◽  
Second Law ◽  
Crystal Oscillator ◽  
Time Intervals ◽  
Experimental Procedure ◽  
Oscillator Circuit ◽  
Experimental Errors ◽  
Newton's Second Law

We describe an experimental procedure to probe the validity of Newton's second law. The experimental arrangement allows us to accelerate a glider on an air track by means of forces that are both steady and known. We also show how to determine acceleration from average speeds calculated for successive time intervals of the motion measured by using several electronic counters connected to a single-crystal oscillator circuit. Within experimental errors, the experiments clearly show the proportionality between acceleration and force for a fixed mass and between acceleration and inverse of mass for a fixed force.

A Dynamic Investigation of Piping Systems With a Bolted Flange

2002 ◽  
Author(s):  
William H. Semke ◽  
George D. Bibel ◽  
Sukhvarsh Jerath ◽  
Sanjay B. Gurav ◽  
Adam L. Webster
Keyword(s):  
Dynamic Response ◽  
High Strength ◽  
Mode Shapes ◽  
Piping System ◽  
Resonant Frequencies ◽  
Experimental Procedure ◽  
Piping Systems ◽  
Response Output ◽  
Bolted Flange ◽  
Dynamic Investigation

The dynamic response of piping systems with a bolted flange is analyzed. Experimental and numerical analyses and results are presented and show excellent correlation. An overhanging piping system at various span lengths with a flange at mid-length is used. The testing configuration consists of a standard 2-in. (51 mm) schedule 40 steel pipe and an ANSI B16.5 class 300-pound flange. The presence of a spiral wound wire gasket and high strength flange bolts is also assessed. Included are multiple resonant frequencies and their respective mode shapes for various span lengths and gasket configurations. The experimental procedure utilizes an accelerometer to gather the dynamic response output of the piping system due to an impulse. The resonant frequencies are then determined using a Fast Fourier Transform (FFT) method. The numerical analysis is conducted using the commercial Finite Element (FE) code ANSYS®. Both methods take into account the complex interaction between the flange and gasket and their impact on the entire piping system. The dynamic effects of a bolted flange and gasket on a piping system are critical in their use and a summary of the results for a variety of configurations is presented.

Analytical and Experimental Study on Balancing Using Influence Coefficient Method

2013 ◽  
Vol 393 ◽  
pp. 694-702
Author(s):  
Wan Sulaiman Wan Mohamad ◽  
A.A. Mat Isa ◽  
M.A. Ismail
Keyword(s):  
Experimental Study ◽  
Experimental Verification ◽  
Mass Concentration ◽  
Vibration Reduction ◽  
Influence Coefficient ◽  
Centrifugal Forces ◽  
Experimental Procedure ◽  
Influence Coefficient Method ◽  
Phase Angles ◽  
Coefficient Method

Unbalance effect on rotating element happens as a result of an off centered mass concentration which will generate centrifugal forces with increasing running speeds. This unwanted situation requires correction to avoid failure due to excessive vibration. In this study, unbalance problem are studied by using theoretical influence coefficient method followed by the experimental verification. Experimental procedure is performed by using trial mass to calculate the influence coefficient and the corrected mass values as well as the phase angles. Finally, the vibration reduction of the rotor is compared theoretically and experimentally. Based on the results, the improved vibration reduction could be obtained reasonably for both single and two-plane balancing by using influence coefficient method.

An Experimental Verification of the Hemispherical Cup Puckering Problem

1989 ◽  
Vol 111 (3) ◽  
pp. 248-254 ◽  
Author(s):  
M. Donoghue ◽  
R. Stevenson ◽  
Y. J. Kwon ◽  
N. Triantafyllidis
Keyword(s):  
Experimental Study ◽  
Numerical Solution ◽  
Analytical Model ◽  
Experimental Verification ◽  
Critical Discussion ◽  
Solution Technique ◽  
Practical Reasons ◽  
Experimental Procedure ◽  
Theoretical Results

In this work is presented an experimental study of the hemispherical cup puckering test. This investigation is motivated by some theoretical as well as by some practical reasons which are elaborated upon in the introduction. After a brief outline of the analytical model and the corresponding numerical solution technique, the presentation continues with a description of the experimental procedure. A comparison between the experimental and the theoretical results is given next followed by a critical discussion.

On the Difference Between Monkeys' and Humans' Response Times: Could It Be the Experimental Procedure?

2012 ◽  
Author(s):  
Guy E. Hawkins ◽  
Birte U. Forstmann ◽  
Eric-Jan Wagenmakers ◽  
Scott D. Brown
Keyword(s):  
Response Times ◽  
Experimental Procedure ◽  
The Difference

The Cultivation of Gratitude: An Online Experimental Procedure

2006 ◽  
Author(s):  
Mayra L. Torres ◽  
Nancy J. Cobb ◽  
Ramani S. Durvasula
Keyword(s):  
Experimental Procedure
Sign in / Sign up

Export Citation Format

Share Document