Engine Noise Reduction by Structural Study of Cylinder Block 800441

A structural study of the cylinder block was made using a 4-cylinder, 1,800 cc gasoline engine with an aim toward reducing engine noise. First, we studied the relationship between cylinder block vibration and radiated noise, and also the principal component modes of noise and vibration.From the results obtained, it became clear that engine noise could be reduced by suppressing the basic natural vibration of the cylinder block.Then, alternative shapes of engine blocks were examined in an attempt to reduce noise with a minimal change in present production facilities and engine weight, using the finite element method.The trial cylinder block was built into an engine after examination by the impulse excitation method and holography. As the result of testing it in running condition, we were able to reduce the noise of the engine proper 2.5db-A with a weight increase of about 3 percent.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 43% off list price.
Login to see discount.
Special Offer: Purchase more aerospace standards and aerospace material specifications and save! AeroPaks off a customized subscription plan that lets you pay for just the documents that you need, when you need them.