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A procedure is described for measuring the near-field tire noise generated by a treadless tire operating at specified fixed conditions. Analysis of the noise spectra indicates that they are dependent on pavement macrotexture and that certain characteristics of the spectra appear to correlate with skid number-speed gradient as deduced from locked wheel skid tests. Third-octave spectral analyses are shown for a treadless tire operating at 40 mph over seven test surfaces having different macrotextures. A tentative correlation of the sound pressure level of the tire noise for the thirdoctave with center frequency at 1600 Hz, and the skid number-speed gradient is presented. The investigation suggests the feasibility of tire noise measurements as a practical means of pavement skid resistance appraisal in a normal highway traffic environment.

Increasing the productivity and quality of products while reducing production costs are the main objectives of manufacturing companies in the market economy. For companies that produce parts using cutting processes, these objectives are strongly influenced, among other factors,by the devices used during the manufacturing process. Devices must allow the clamping of workpieces to be done in a short period of time, to have simple construction, to be cheap while positioning and installing errors to be minimal to ensure that the parts correspond to the manufacturing documentation. The calculation of clamping errors of workpieces and devices involves complex analysis, therefore in order to accurately determine these errors, data obtained from experiments, sometimes costly and difficult to be done, are used. This paper presents the clamping force calculation of a prismatic part, as well as the study of elastic deformations that appear by clamping it in the device, using finite element analysis.