LOWERING DIESEL NOISE THROUGH HARDWARE MODIFICATIONS

USE OF THE THREE NOISE-REDUCTION METHODS---ISOLATION, SHIELDING, AND DAMPING---HAS MADE IT POSSIBLE TO LOWER THE NOISE OF INDIVIDUAL DIESEL-ENGINE COMPONENTS BY 5-10 DB(A). OVERALL ENGINE REDUCTION IN THE TEST CELL RANGED FROM 3 TO 6 DB(A), WHILE IN SOME CASES GREATER REDUCTIONS WERE EXPERIENCED WITH THE ENGINE INSTALLED IN THE VEHICLE. APPLICATIONS OF EACH OF THE THREE METHODS ARE DESCRIBED. IT IS NOTED THAT THE FINAL ASSESSMENT OF NOISE REDUCTION SHOULD BE BASED ON FINDINGS IN THE VEHICLE, AS TEST CONDITIONS AND PROCEDURES IN THE TEST CELL ARE QUITE DIFFERENT FROM OPERATIONAL ONES. SEVERAL CURVES ARE PRESENTED SHOWING THE EFFECT OF REDUCING ENGINE NOISE WHEN NOISE FROM OTHER VEHICLE COMPONENTS IS GREATER OR LESS THAN THAT FROM THE ENGINE. ENGINE COMPONENTS ARE IDENTIFIED WHOSE NOISE REDUCTION MAY INTRODUCE PROBLEMS IN MANUFACTURE AND INSTALLATION. OVER A MILLION FIELD TEST MILES HAVE BEEN ACCUMULATED ON VEHICLES WITH INSTALLED NOISE CONTROL PACKAGES, ONE UNIT HAVING MORE THAN 120,000 MILES. NO SIGNIFICANT PERFORMANCE, RELIABILITY, MAINTENANCE, OF SAFETY PROBLEMS HAVE BEEN ENCOUNTERED.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/2240909
• Publication Date: 1973-6

Media Info

• Features: Figures; Tables;
• Pagination: p. 41-7
• Serial:
  • Automotive Engineering
  • Volume: 81
  • Issue Number: 6
  • Publisher: Society of Automotive Engineers (SAE)
  • ISSN: 0098-2571

Subject/Index Terms

• TRT Terms: Diesel engines; Engines; Noise control; Trucks
• Subject Areas: Highways; Motor Carriers; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00224286
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 25 1973 12:00AM