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美国联邦铁路管理局最近与BBN公司所属的消声技术分部签订了一份利用有效的噪声控制技术开发一种机车排气消声器的合同。该合同的签订属于联邦铁路管理局为推动高速客运铁路运输而努力的一部分。电传动内燃机车的噪声主要来自干柴油机排气、冷却风扇和轮／轨接触面。BBN公司希?
The United States Federal Railroad Administration recently signed a contract to develop a locomotive exhaust muffler with effective noise control technology with the BBU’s anechoic technology division. The signing of the contract is part of the efforts of the Federal Railroad Administration to promote high-speed passenger rail transport. The noise of electric drive diesel vehicles comes mainly from dry diesel exhaust, cooling fans and wheel / rail contact surfaces. BBN company hope?