44 results about "Radial Force Variation" patented technology

Methodology for characterizing non-uniformity forces at a tire spindle, such as low and high speed radial force variations and high speed tangential force variations include the steps of measuring radial run out and radial or tangential force variations at high and/or low speeds. From such measurements, the contribution of a predetermined type of stiffness variation (e.g. radial, tangential, extensional, bending) to respective radial and/or tangential force variations can be determined. Signature analysis statistical methods may also be utilized to characterize such tire non-uniform forces for different steps and reference physical angles of a tire construction process. Based on the characterization of such tire non-uniform forces, additional process steps may further correspond to tire grading and/or sorting processes, physical tire modification processes and tire manufacturing processes. Tire correction mechanisms and/or feedback control in a tire manufacturing process preferably yield tires having radial run out and stiffness variation parameters that are out of phase for one or more harmonics, thus yielding a reduction in the non-uniformity forces such as radial and tangential force variations at a tire spindle.

Improved and more easily implemented methods for predicting high speed radial force variation and uneven mass distribution utilize other measurements such as radial nm out and other parameters. The prediction model for high speed radial force variation uses a speed-dependent calibration term for predicting higher harmonic components, while the same or other models can be used for the first harmonic. The uneven mass distribution prediction model accounts for deformation of the tire along multiple tracks, thus employing a more realistic model of crown deformation that accounts for changing tire stiffness levels across different harmonic components of the measured and predicted parameters.

Improved and more easily implemented methods for predicting uniformity parameters such as uneven mass distribution, radial run out and high speed radial force variation utilize other measurements such as the tire crown thickness variation. When high speed radial force variation is calculated, low speed radial force variation is also measured. Tire crown thickness variation can be measured in different fashions depending on the particular tire manufacturing process employed. By electronically determining resultant uniformity parameters, tires can be improved by rectification to address the uniformity levels. In addition, tire manufacturing can be improved by altering the resultant location of tire crown thickness variation relative to other aspects of the tire and/or tire manufacturing process.

A tire manufacturing method includes a method for optimizing the uniformity of a tire by reducing the after cure radial force variation. The after cure radial force variation vector is modeled as a vector sum of each of the vectors representing contributions arising from the tire building steps—the “tire room effect vector” and a vector representing contributions arising from the vulcanization and uniformity measurement steps—the “curing room effect vector.” In further detail, both the tire room and curing room effect vectors can be further decomposed into sub-vectors representing each radial force variation contribution for which a measurable indicator is available. For a series of tires, the method obtains such measurements as the before cure radial runout (RRO) at one or more stages of the building sequence, measurements of loading angles on the tire building equipment, and measurements made during vulcanization process.

Methodology for characterizing non-uniformity forces at a tire spindle, such as low and high speed radial force variations and high speed tangential force variations include the steps of measuring radial run out and radial or tangential force variations at high and/or low speeds. From such measurements, the contribution of a predetermined type of stiffness variation (e.g. radial, tangential, extensional, bending) to respective radial and/or tangential force variations can be determined. Signature analysis statistical methods may also be utilized to characterize such tire non-uniform forces for different steps and reference physical angles of a tire construction process. Based on the characterization of such tire non-uniform forces, additional process steps may further correspond to tire grading and/or sorting processes, physical tire modification processes and tire manufacturing processes. Tire correction mechanisms and/or feedback control in a tire manufacturing process preferably yield tires having radial run out and stiffness variation parameters that are out of phase for one or more harmonics, thus yielding a reduction in the non-uniformity forces such as radial and tangential force variations at a tire spindle.

A disk driving device including a centering member mounted to an inner portion of a cylindrical portion of a turntable. The centering member includes a linking portion serving as fulcra and a centering portion separated from the linking portion. The centering portion is resiliently biased with an outward force that acts parallel to a flange providing a disk-mounting surface of the turntable in order to center a disk.

The invention relates to a high-precision elastic tapered bore rolling device of a cone sealing pipe joint, which belongs to a machine processing tool. The rolling device comprises a knife handle body, a rectangular pressure spring, an outer sliding sleeve, a locating pin roll, a core sleeve, a rolling mandril, a bearing sleeve, a thrust ball bearing, an adjusting pad, a flange sleeve and a roller. Compared with the traditional processing methods of drilling, internal boring and polishing, the production efficiency can be improved manyfold by adopting the rolling device to roll the conical surface inner bore of the cone sealing pipe joint; the surface roughness can be not more than Ra0.4 so that the requirements of a working drawing are stably reached, and the metal surface of the conical surface inner bore is strengthened, and thereby, the strength and the hardness of the surface layer are improved. The rolling device has good generality, and a rolling head fitting the size of the cone sealing pipe joint can be rapidly replaced. The elasticity of the spring can enable the changes of the axial force and the radial force which are borne by the rolling device in rolling the conical surface inner bore to be smaller; compared with a rigid rolling device, the abrasion of the rolling head of the rolling device is reduced, and thereby, the service life of the rolling device is prolonged by 3 to 5 times.

It is possible to significantly reduce a prediction error of the high-speed RFV and the high-speed TFV in a tire having a large PRO growth amount at high speed. Three or more sample tires are extracted from each lot. The PRO and RFV are measured and the least-square method is used to predict (100) the upper and lower and front and back natural angle frequency, attenuation ratio, upper and lower spring constant, and rolling radius coefficient. By using the PRO measurement apparatus, the PRO during idling is measured. By using an AAV measurement apparatus, an actual measurement value AAVL of the angle acceleration fluctuation at a low speed is measured (102). The PRO and AAV at a high speed are predicted (104) and the actual measurement value and prediction value are used to predict the high-speed RFV and TFV.

The invention discloses a method for detecting the pressing force variation of the winding of a power transformer based on recursive quantitative analysis. The method comprises firstly using a short circuit experimental method to acquire a box surface vibration signal of a transformer with normal winding pressing force, and using a recursive quantitative analysis (RQA) method to obtain a reference RQA parameter; then acquiring a box surface vibration signal of a transformer with a winding to be detected by using the short circuit experimental method at the same sampling frequency and sampling time, and obtaining the RQA parameter of the transformer winding with unknown compactness by RQA; comparing the RQA parameter with the reference RQA parameter to determine if the transformer winding pressing force has changed. The method not only establishes the RQA measurement for detecting the variation trend of the overall pressing force of the winding, but also directly performs the RQA analysis on the vibration signal of a single sensor and establishes the local variation trend measurement of the pressing force. The method uses little equipment, simple in operation and accurate in diagnosis, can accurately detect the loosening of the winding due to pressing force changes.

The invention relates to a friction testing stand which is composed of a rack, a vibration isolator, a power system testing system, a control and data processing system and an auxiliary system, etc. The auxiliary system is composed of a synchronous belt tensioning mechanism, a spraying system, a temperature measuring system and the like. The rack supports all devices. A servo motor synchronously drives first and second specimen shafts to rotate at the same speed and in the reverse direction through two rotational motions at the same rotational speed and in the reverse direction that are outputted by a gear case. By gravity horizontal loading of a counterweight on the first specimen shaft through a fixed pulley and a stressing lever, the first specimen shaft presses a test-piece and the second specimen shaft tightly under the gravity loading so as to form two identical frictional forces, and the test-piece vibrates under the action of the two frictional forces. Displacement changes of the test-piece are calculated through detecting force variation of a force sensor, and frictional coefficient and frictional vibration characteristics of a sample material are calculated. Interference generated by vibration of the testing system can be eliminated, and testing is accurate. The friction testing stand has a compact structure and is simple to operate.

Systems and methods for improving the uniformity of a tire using convolution/deconvolution-based uniformity parameter estimates of a tire are provided. For instance, convolution can be used to estimate radial force variation from one or more uniformity parameter measurements, including radial run out parameter measurements. Deconvolution can be used to estimate radial run out from one or more uniformity parameter measurements, including radial force variation parameter measurements. The estimated uniformity parameter can be estimated from the uniformity parameter measurements using one or more models. The one or more models can represent an estimated radial uniformity parameter at a discrete measurement point as a weighted sum of the measured radial uniformity parameter at the discrete measurement point and one or more selected measurement points proximate the discrete measurement point. The measurement points can be selected based on the contact patch length of the tire.

A method of improving the high-speed uniformity of tire performance that reduces low and/or high harmonics. The method includes determining a force variation that is created by rotation of a first tire, having a first tread design, at high speed. A second order harmonic of the force variation is analyzed. A second tire design is generated that circumferentially shifts one or more ribs of the first tread design to minimize the second order harmonic alone or in combination with other order harmonics.