The inner door of the door is sealed with a sealing strip, and the sound insulation effect and the sealing performance are improved.
门框内侧预装有密封条，隔声效果及密封性提高。
An improved back structure is proposed according to the principle of sound absorption. sound insulation and damping vibration. It can lower inner noise so as to meet the state standard.
根据吸声、隔声和阻尼减振原理，对某型双层客车后部结构提出了改进措施，使其车内噪声达到了国家规定。
An improved back structure is proposed according to the principle of sound absorption. sound insulation and damping vibration. It can lower inner noise so as to meet the state standard.
根据吸声、隔声和阻尼减振原理，对某型双层客车后部结构提出了改进措施，使其车内噪声达到了国家规定。
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