Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1986-05-06
1988-02-02
Chapman, John
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
G01M 700
Patent
active
047222239
ABSTRACT:
The present invention provides an apparatus and method for establishing a measure of the modulus of elasticity of a wood panel. The apparatus comprises a support frame having a triangular array of panel support points provided thereon. A load cell, in combination with one support point, is interconnected to a frequency counter. This assembly is functional to determine the weight and vibration frequency of a dropped panel. A panel lifting assembly is provided to raise and drop the panel, thereby causing it to vibrate at its natural frequency. In a process aspect, the invention involves supporting the panel at three triangularly arranged support points, raising the panel at the apex end, and dropping the panel to cause it to vibrate at its resonant frequency, and computing a measure of stiffness from the measurements made.
REFERENCES:
patent: 2486984 (1949-11-01), Rowe
patent: 3513690 (1970-05-01), Pellerin et al.
Bach Lars
Porter Andrew W.
Chapman John
Her Majesty the Queen in right of the Province of Alberta, as
Johnson Ernest P.
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