| 摘要 |
<p>PURPOSE:To reduce vibration on a ballast case surface by equalizing the relation of the distance between adjacent nodes of each distribution curve of vibration of each vibration source on the ballast case surface to that between respective nodes of distribution curves of vibrations of respective vibration sources with a specified relation. CONSTITUTION:Leakage transformers 1A and 1B are symmetrically disposed on the both sides of a center line X corresponding to 1/2 the size of a ballast case in the lengthwise direction to simultaneously balance its weight. Here, let the distribution curve of vibration of the transformer 1A be represented by (a), that of the tranwformer 1B by (b), the distance between the node of the curve (a) and that of the curve (b) by B, and the distance between adjacent nodes of the curve (a) or (b) by A, the ratio B/A is within the range of 1/4-3/4 and the composed vibration (c) becomes approximately flat. By this, vibration levels can be reduced, thereby to allow noises in assembling the ballast and tools to be reduced.</p> |
