Showing papers on "Noise barrier published in 1972"

Noise barrier evaluation and alternatives for highway noise control

Abstract: VARIOUS HIGHWAY NOISE SHIELDING TECHNIQUES (NOISE BARRIERS, INTERVENING HOUSES AND CUT AND FILL SECTIONS) ARE EVALUATED AND THE RESULTS OF FIELD SOUND MEASUREMENTS ARE COMPARED WITH RESULTS CALCULATED BY THE BBN NOISE ESTIMATION METHOD FIVE DIFFERENT NOISE BARRIER TYPES CONSTRUCTED IN METROPOLITAN TORONTO ARE DESCRIBED IN TERMS OF LOCATION, DIMENSIONS, MATERIALS, APPEARANCE, TYPE OF SUPPORT AND COASTS THE NOISE BARRIERS, 10 TO 12 FEET HIGH AND LOCATED EITHER MIDWAY BETWEEN THE HOUSES AND THE PAVEMENT OR AT THE HIGHWAY SHOULDER, 60 TO 140 FEET FROM THE NEAREST HOUSES, PROVIDED ONLY 2 TO 6 DBA REDUCTION AT THE FIRST ROW OF HOUSES, 4 FEET ABOVE GROUND IMMEDIATELY BEHIND THE BARRIERS, WHERE THE REDUCTIONS ARE OF LITTLE REAL BENEFIT, REDUCTIONS OF 8 TO 14 DBA WERE ACHIEVED COMPARISON OF MEASURED AND CALCULATED SOUND LEVEL REDUCTIONS DUE TO BARRIERS INDICATES THAT THE CALCULATED REDUCTIONS ARE OVERESTIMATED RATHER THAN UNDERESTIMATED LIMITED VALIDATION STUDIES OF THE BBN NOISE ESTIMATION METHOD SHOW A NEED FOR FURTHER RESEARCH PARTICULARLY IN THE AREAS OF THE VERTICAL DISTRIBUTION OF SOUND LEVELS AND ATTENUATION OF FREEWAY NOISE WITH DISTANCE THE INFLUENCE OF MATERIALS AND HEIGHT OF BARRIERS WERE ALSO EXAMINED THE RESULTS AND CONCLUSIONS OF THESE STUDIES ARE PRESENTED DUE TO THE RELATIVE BARRIER INEFFECTIVENESS, GREATER ATTENTION AND EMPHASIS SHOULD BE GIVEN TO OTHER NOISE CONTROL MEASURES SUCH AS HOUSING MODIFICATIONS, LAND USE CONTROL AND CONTROL OF VEHICULAR NOISE EMISSIONS AT THE SOURCE THESE ARE BRIEFLY DESCRIBED AT THE END OF THE REPORT

Noise Pollution and Abatement: A Review of Literature

Abstract: A PROPOSAL TO VERIFY THE NOISE PREDICTION PROCEDURE CURRENTLY IN USE BY THE KENTUCKY DEPARTMENT OF HIGHWAYS IS PRESENTED. RECORDINGS AT SITES WITH VARYING ROADWAY CONFIGURATIONS AND CHARACTERISTICS, AND UNDER VARYING TRAFFIC CONDITIONS WILL BE TAKEN AND ANALYZED. A PAPER INCLUDED IN SUPPORT OF THE PROPOSAL REVIEWS NOISE POLLUTION WITH RESPECT TO SENSORY PHYSIOLOGY, PUBLIC HEALTH, PSYCHOLOGICAL EFFECTS, OCCUPATIONAL EXPOSURE, AND CONTROL MEASURES. HIGHWAY NOISE IS CONSIDERED IN LIGHT OF THE PROBLEMS OF MEASUREMENT VALIDITY, IDENTIFICATION OF SIGNIFICANT VARIABLES, AND ADEQUATE CONTROL MEASURES. FOR THIS LAST, THREE GENERAL PRINCIPLES ARE CITED: VEHICLE NOISE CONTROL, BYPASSING POPULATED AREAS, AND HIGHWAY DESIGN FEATURES SUCH AS ELEVATED OR DEPRESSED ROADWAYS AND LANDSCAPING.

Traffic noise reduction by earth berms

Abstract: BY USING NATURAL EARTH BERMS THAT WERE SHORT IN LENGTH AND IRREGULAR IN SHAPE, MEASUREMENTS WERE MADE WITH TRUCKS AS THE NOISE SOURCE TO PROVIDE COMPARISONS WITH THEORETICAL FORMULAS. STANDARD A-WEIGHTED NETWORK - GENERAL RADIO EQUIPMENT - WAS UTILIZED IN OBTAINING NOISE ATTENUATION LEVELS.