From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Preprint paper on the subject of tire noise by Arthur W. Bull of the U.S. Tire Co., Inc.
| Identifier | ExFiles\Box 158\1\ scan0124 | |
| Date | 22th January 1934 | |
| PREPRINT.--Paper to be presented at the Annual Meeting of the Society of Automotive Engineers at the Book-Cadillac Hotel, Detroit, Mich., Jan. 22 to 25, 1934. Printed to stimulate written or oral discussion. Subject to revision for errors before final publication. All papers presented at meetings of the Society are the exclusive property of the Society, from which permission to publish this paper, in full or in part, after its presentation and with credit to the author, and the Society, can be obtained upon request. Handwritten notes: 1339 WYMAN Noted Gow TIRE NOISE By Arthur W. Bull Development Division U.S. Tire Co., Inc. INTRODUCTION Public taste has changed in respect to car noise. Twenty years ago the use of muffler cut-outs was nearly universal, and the thrill of passing someone was incomplete unless your motor had a louder, deeper roar than his. Gradually, noise which had given added exhilaration to the early motorists became a general nuisance. As the car mechanism was improved, noise was reduced, until, within the last few years, tire noise has become noticeable, and its reduction has been required, especially at speeds below 40 miles per hour. In most cars, wind noises are sufficient to mask tire noises above this speed. However, as stream-lining becomes more complete, wind noises will be further reduced, and tire noise at higher speeds will become more important. Tire noise is objectionable, not only because noise in itself is disagreeable, but also because the owner quite often mistakes tire noise for axle noise, timing-chain noise, or other mechanical noise, and demands adjustment of these parts when there is nothing wrong with the car. However, while tire noise has been very generally objectionable to car engineers, there are still some car owners who like to hear certain types of tire noise, especially a low hum which gradually rises in pitch as speed is increased. To one with a musical ear, such a pitched sound serves as a simple and quite accurate speedometer especially for maintaining constant speed. MEASUREMENT OF NOISE: | ||