Oil pan shoulder function due to the uniqueness of oil cooling, so the oil pan was semi-damping enwrapped in the experimentation , The results showed a piece of sound power level lower 1.

• 由于油底壳担负着机油散热功能的特殊性,试验对油底壳采用半约束阻尼包裹处理,结果显示整机声功率级降低了1。