middle cover plate

• 1. 中盖板: middle cover plate
• 2. 盖板中心部分: Cover center section

• 1.钢片穿过中盖板方孔焊接，以保证其稳定性。
  The steel piece goes through the lap and welding with the lap, to guarantee its stability.
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• 2.盖板针布中嵌入了过多的飞花和籽屑。
  Excessive fly and seed bits embedded on flat wire.
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• 3.通过改变换能器前后指数型盖板的半径减编系数，得出了换能器中纵向与扭转两种振动模式同频共振的条件。
  By changing the cross sectional radius decay coefficient of the exponential metal horns, the longitudinal and torsional vibrations in the transducer could resonate at the same resonance frequency.
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