vibration Archive
Orders v Time – Comparing Overall Levels
Posted on October 23, 2007 | 4 CommentsBy combining a speed signal with a data signal and using the Short Time FFT algorithm (Hopping FFT), it is possible to extract order data directly as a function of...Measuring Torsional Crank Shaft Jitter
Posted on June 24, 2007 | No CommentsUsing Prosig’s P8000 series data acquisition system with DATS signal analysis software, torsional analysis (crank jitter) was performed on an automotive engine attached to an engine dynamometer. The significance of...
What Is Resonance?
Posted on May 23, 2007 | 23 CommentsFirst, in order to explain resonance we have to explain the terms we will use. - A period is the amount of time it takes to complete one cycle -...
Measuring For Success
Posted on September 11, 2006 | No CommentsThe following application note shows the steps taken to perform a structural analysis on an automotive exhaust pipe structure with the aim of improving the structural damping properties of the...
Made To Measure
Posted on June 6, 2006 | 4 CommentsIn this note the different types of transducers that can be used with the Prosig P8000 series data acquisition system are discussed. The article deals with the design and function...Torsional Vibration, Tacho Pulses And Aliasing
Posted on January 12, 2006 | 4 CommentsWith shafts, gears and the like, the general method of determining the rotational speed is to use some form of tachometer or shaft encoder. These give out a pulse at...
Analyzing Shaft Twist And Repairing Damaged Tachos
Posted on October 19, 2005 | 1 CommentA shaft has been instrumented with two shaft encoders, one at each end. Each shaft encoder gives out a once/rev pulse and a 720 pulses/rev signal. Each signal was digitised...A Simple Noise Test
Posted on August 26, 2005 | 2 CommentsIn a recent article we described how the Prosig P8000 hardware and DATS software had been used to help Dalmeny Racing diagnose a problem with an exhaust bracket on their...
Measuring Torsional Twist & Vibration Along a Shaft or Through a Geartrain
Posted on May 15, 2002 | 3 CommentsThe measurement of the twist angle between two points along a shaft or through a gear train may be derived from a pair of tacho signals, one at each end...
High Pass Filtering And Tacho Signals
Posted on June 6, 2001 | 2 CommentsIt is sometimes necessary to pass a signal through a high pass filter to eliminate low frequency signals. These may arise for instance from whole body vibrations when perhaps our...
Time Varying Overall Level
Posted on May 1, 2001 | No CommentsA common requirement in noise and vibration analysis is to find the overall level of a signal as a function of time. Now the overall level is a measure of...
