The numerical modelling of a driven nonlinear oscillator
The torsional oscillator in the Earth Sciences Division was developed at Lawrence Livermore National Laboratory and is the only one of its kind. It was developed to study the way rocks damp vibrations. Small rock samples are tested to determine the seismic properties of rocks, but unlike other traditional methods that propagate high frequency waves through small samples, this machine forces the sample to vibrate at low frequencies, which better models real-life properties of large masses. In this particular case, the rock sample is tested with a small crack in its middle. This forces the rock to twist against itself, causing a {open_quotes}stick-slip{close_quotes} friction, known as stiction. A numerical model that simulates the forced torsional osillations of the machine is currently being developed. The computer simulation implements the graphical language LabVIEW, and is looking at the nonlinear spring effects, the frictional forces, and the changes in amplitude and frequency of the forced vibration. Using LabVIEW allows for quick prototyping and greatly reduces the {open_quotes}time to product{close_quotes} factor. LabVIEW`s graphical environment allows scientists and engineers to use familiar terminology and icons (e.g. knobs, switches, graphs, etc.). Unlike other programming systems that use text-based languages, such as C and Basic, LabVIEW uses a graphical programming language to create programs in block diagram form.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- OSTI ID:
- 282982
- Report Number(s):
- UCRL-ID-114972-4; CONF-9505323-; ON: DE96006013; TRN: 96:003984-0018
- Resource Relation:
- Conference: Science and Engineering Research Semester (SERS) spring 1995 symposium, Livermore, CA (United States), 5-12 May 1995; Other Information: PBD: Nov 1995; Related Information: Is Part Of SERS internship Spring 1995 abstracts and research papers; Davis, B.; PB: 294 p.
- Country of Publication:
- United States
- Language:
- English
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