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Mechanics in Engineering ›› 2004, Vol. 26 ›› Issue (2): 0-0.doi: 10.6052/1000-0992-2003-058

• Education Study •    

NATURAL FREQUENCY OF THE PERFECTLY FLAT MASK

  

  • Received:2003-02-13 Revised:2003-10-21 Online:2004-04-10 Published:2004-04-10

Abstract: The mask vibration degrades the color purity in the perfectly flat color picture tube of high resolution television. This paper is concerned with some analytical methods for calculating the natural frequency of the perfectly flat mask. Then applying the basic theories of elasticity, we have established the governing equation for the horizontal oscillation of a thin plate and yielded the natural frequencies and modal shapes of the perfectly flat mask by modal analysis with its four edges simply supported. The results obtained are found to be satisfactory by comparison with experiments. It also shows that the method for determining the natural frequency of the perfectly flat mask is effective, simple and valid. The result provides a basis for optimal designs of structure parameters in order to reduce the perfectly flat mask vibration.

Key words: elasticity, mask vibration, four edges simply supported,