CAJ | 학술논문

某公司研发的大功率柴油机装车后，用户反映怠速时发动机后端噪声大，并伴有“格拉拉”的异响。为确定发动机的噪声源，本文分别在台架和整车上对发动机做了振动噪声试验，试验结果显示发动机的噪声主要来自齿轮室、高压油泵和空压机以及缸盖罩壳，发动机“格拉拉”的异响是齿轮室的齿轮撞击声，造成齿轮撞击的主要原因是齿轮啮合间隙过大。对此本文提出了两种降噪方案：第一在齿轮室、高压油泵和空压机等处加装遮蔽罩；第二改进齿轮和缸盖罩壳设计，减小齿轮啮合间隙和缸盖罩壳耦合振动，降低噪声。
모공사연발적대공솔시유궤장차후，용호반영태속시발동궤후단조성대，병반유“격랍랍”적이향。위학정발동궤적조성원，본문분별재태가화정차상대발동궤주료진동조성시험，시험결과현시발동궤적조성주요래자치륜실、고압유빙화공압궤이급항개조각，발동궤“격랍랍”적이향시치륜실적치륜당격성，조성치륜당격적주요원인시치륜교합간극과대。대차본문제출료량충강조방안：제일재치륜실、고압유빙화공압궤등처가장차폐조；제이개진치륜화항개조각설계，감소치륜교합간극화항개조각우합진동，강저조성。
Big noise and rattle was annoyed at idling work by vehicle users when a new type large power diesel engine which was researched and developed by a domestic company was assembled to vehicle. Vibration and noise tests were performed in test-room and on vehicle separately in order to locate the noise source. The results of tests show that the noise mainly stem from the gear-housing, high pressure oil pump, air compressor and valve cover. The rattle from the gear-housing was the knocks which were because of the over-big clearance between two gears when gears mesh. At last two ways of reducing noise were proposed, one is that shield were assembled around the gear-housing, high pressure oil pump and air compressor, the other is to redesign and optimize the stepped-gear and the bolts of the valve cover to reduce the knocks of gears and the couple vibration of the valve cover and reduce the noise.