CN-122019988-A - Tire uniformity detection signal correction method and system

CN122019988ACN 122019988 ACN122019988 ACN 122019988ACN-122019988-A

Abstract

The invention discloses a tire uniformity detection signal correction method and a system, which relate to the technical field of tire uniformity detection and comprise the steps of collecting original detection signals of a tire in the uniformity detection process, and calculating and determining sampling points of the tire and a load wheel rotating for one circle; the method comprises the steps of constructing an original detection signal model formed by superposition of a tire error signal, a load wheel error signal and direct current bias, forming a vector form by each unknown superposition component in the model, constructing a matrix to establish a linear equation set, calculating to obtain initial periodic reference waveforms of the tire error signal and the load wheel error signal by a periodic synchronous average method according to the original detection signal, carrying out alternate optimization iterative solution on the linear equation set by a least square method with the initial periodic reference waveforms as initial values until iteration converges, and outputting the load wheel error signal and the tire error signal after separating the geometric errors of the load wheel. The invention can realize the accurate separation of the geometric errors of the load wheel in the original detection signals.

Inventors

FENG XIANYING
LIU SHENXING
Che Qirui
LI PEIGANG
LIU DECHEN
ZHANG XIAOFEI
LIU ZHENWEN

Assignees

山东大学
山东玲珑机电有限公司

Dates

Publication Date: 20260512
Application Date: 20260415

Claims (10)

1. A tire uniformity detection signal correction method, comprising: Collecting original detection signals of the tire in the uniformity detection process, and calculating and determining sampling points of the tire and the load wheel rotating for one circle; According to the determined sampling points, an original detection signal model formed by superposition of a tire error signal, a load wheel error signal and a direct current bias is constructed, each unknown superposition component in the model is formed into a vector form, and a matrix is constructed to establish a linear equation set; According to the original detection signal, calculating to obtain initial periodic reference waveforms of the tire error signal and the load wheel error signal by adopting a periodic synchronous average method, taking the initial periodic reference waveforms as initial values, adopting a least square method to perform alternate optimization iterative solution on the linear equation set until iteration converges, and outputting the load wheel error signal and the tire error signal after separating the geometric errors of the load wheel.
2. The tire uniformity machine signal correction method of claim 1, wherein said determining the number of sampling points for one revolution of said tire and load wheel comprises: Determining sampling points of one circle of tire rotation according to a pulse signal output by a rotary encoder on a tire detection spindle during tire uniformity detection; And calculating the sampling point number of one rotation of the load wheel according to the sampling point number of one rotation of the tire and combining the distance between the load wheel and the main shaft of the tire and the radius of the load wheel.
3. The tire uniformity testing signal correction method of claim 1, wherein said raw testing signal model is: ; Wherein, the Represents the original detection signal, n=0, 1, 2..n-1, N is the number of sampling points of the original detection signal; Is a periodic reference waveform of the tire error signal, The number of samples representing the tire rotation period, i.e., one revolution of the tire, k=0, 1,2, -1; Is the periodic reference waveform of the load wheel error signal, For the number of sampling points for the load wheel rotation period, i.e., one revolution of the load wheel, k=0, 1, 2, -1; The remainder is calculated by taking the remainder, i.e. dividing N by N, and c is the DC offset component and represents the base value of the signal.
4. The method for correcting a tire uniformity signal according to claim 1, wherein the calculating an initial periodic reference waveform of the tire error signal and the load wheel error signal based on the original detection signal by a periodic synchronous averaging method comprises: sampling point number of original detection signal according to tyre rotation Segmenting, extracting and aligning all complete period segments, and averaging the aligned segments to obtain an initial period reference waveform of a tire error signal; Subtracting the initial periodic reference waveform of the tire error signal from the original detection signal to obtain a load wheel error initial signal, and then rotating the load wheel error initial signal by one cycle of sampling points according to the load wheel And (3) segmenting, namely finding out the optimal phase offset of each segment through cross-correlation analysis, aligning, and averaging the aligned segments to obtain the initial periodic reference waveform of the load wheel error signal.
5. The method of correcting tire uniformity signal according to claim 4, wherein the optimum phase offset and alignment of each segment is found by cross-correlation analysis, which is: aiming at the segmented load wheel error initial signal, calculating the cross-correlation function of the rest segmented signals and the reference segment by taking the first segment segmented signal as the reference segment, and solving the time shift which makes the cross-correlation function maximum, namely the optimal phase shift; each segment signal is phase aligned with the reference segment according to the optimal time shift.
6. The method for correcting tire uniformity signal according to claim 1, wherein the linear equation set is alternately optimized and iteratively solved by a least square method, comprising: obtaining an estimate of the tire and load wheel error signals by cycle extension using an initial cycle reference waveform of the tire and load wheel error signals; the method comprises the steps of estimating a fixed load wheel error signal, subtracting the estimation of the signal by utilizing an original detection signal to obtain a residual error of a tire error signal, combining a constructed matrix only comprising the tire error signal and direct current offset, and solving the modified tire error signal and direct current offset estimation by a least square method; Fixing the estimation of the corrected tire error signal, subtracting the estimation of the signal from the original detection signal to obtain the residual error of the load wheel error signal, and combining the constructed matrix only comprising the load wheel error signal and the direct current offset to obtain the estimation of the corrected load wheel error signal and the direct current offset through least square; Distributing direct current bias according to the total direct current bias of the tire and the load wheel error signals according to the signal power ratio of the tire and the load wheel error signals, and correcting the estimation of the tire error signals and the load wheel error signals by utilizing the redistributed direct current bias; And calculating the correction error of the current iteration, stopping iteration if the error change rate is smaller than the set convergence threshold value, outputting a tire error signal and a load wheel error signal which are finally corrected, otherwise, taking the output signal of the current iteration as input, and continuing the loop iteration until the maximum iteration times are reached.
7. A tire uniformity testing signal correction system, comprising: the data acquisition and preprocessing module is used for acquiring original detection signals of the tire in the uniformity detection process, and calculating and determining sampling points of the tire and the load wheel rotating for one circle; the model construction module is used for constructing an original detection signal model formed by superposition of a tire error signal, a load wheel error signal and a direct current bias according to the determined sampling points, constructing a vector form by each unknown superposition component in the model, and constructing a matrix to establish a linear equation set; The signal solving and correcting module is used for calculating an initial periodic reference waveform of the tire error signal and the load wheel error signal by adopting a periodic synchronous average method according to an original detection signal, carrying out alternate optimization iterative solving on the linear equation set by adopting a least square method by taking the initial periodic reference waveform as an initial value until iteration convergence, and outputting the load wheel error signal and the tire error signal after separating the geometric errors of the load wheel.
8. An electronic device, comprising: A processor for implementing the tire uniformity detection signal correction method according to any one of claims 1-6 when executing the executable instructions stored in the memory.
9. A computer-readable storage medium storing executable instructions for causing a processor to execute the executable instructions to implement the tire uniformity signal correction method of any one of claims 1-6.
10. A computer program product, the computer program product comprising executable instructions stored on a computer readable storage medium; The tire uniformity detection signal correction method of any one of claims 1-6 is implemented when a processor of an electronic device reads said executable instructions from said computer readable storage medium and executes said executable instructions.

Description

Tire uniformity detection signal correction method and system Technical Field The invention relates to the technical field of tire uniformity detection, in particular to a method and a system for correcting tire uniformity detection signals. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. Tire uniformity is one of the core indexes for measuring the quality of tires, and directly affects the running stability, safety and comfort of vehicles. At present, the uniformity detection of the tire needs to load a load wheel on the tire and drive the load wheel and the load wheel to synchronously rotate, and signals such as radial force, lateral force and the like are acquired, so that the geometric and mechanical uniformity characteristics of the tire are analyzed. In an actual detection scene, a load wheel is used as a core moving part for detection, and is affected by a manufacturing process and use abrasion, geometrical non-circular defects such as surface concave-convex, roundness deviation, coaxiality errors and the like inevitably exist, and the inherent errors are overlapped with uniformity signals of the tire, so that the real performance characteristics of the tire are covered, the accuracy of a detection result is directly affected, and the scientificity and the accuracy of the quality grading judgment of the tire are interfered. In the prior art, a mode of superposition and averaging of multiple groups of measurement data is provided to remove eccentric influence of a main shaft system of the tire uniformity test device, but the mode does not consider interference of geometrical non-circular errors of a load wheel on a detection result, and the problem of signal confusion cannot be solved fundamentally. In order to solve the problem of geometric error interference of a load wheel in the tire uniformity detection, a related correction method is proposed at present, namely, a rotary phase meter is additionally arranged on the outer side of the load wheel, and the influence of the load wheel error on the data is removed through real-time acquisition and Fourier transform processing of the rotary phase of the load wheel and the radial force data of the tire, but the introduction of additional detection equipment greatly increases the hardware acquisition cost of a detection system, and also improves the complexity of equipment installation and debugging and later maintenance, so that the method is difficult to adapt to the high-efficiency and low-cost requirements of large-scale industrial detection. Disclosure of Invention In order to solve the defects in the prior art, the invention provides a tire uniformity detection signal correction method and a system, which realize time domain identification and accurate separation of geometric errors of a load wheel in an original tire uniformity detection signal in a pure data driving mode, do not need to add extra hardware, greatly reduce the complexity of data processing and the cost of a detection system, and improve the accuracy of tire uniformity detection. In a first aspect, the present invention provides a tire uniformity detection signal correction method. A tire uniformity detection signal correction method comprising: Collecting original detection signals of the tire in the uniformity detection process, and calculating and determining sampling points of the tire and the load wheel rotating for one circle; According to the determined sampling points, an original detection signal model formed by superposition of a tire error signal, a load wheel error signal and a direct current bias is constructed, each unknown superposition component in the model is formed into a vector form, and a matrix is constructed to establish a linear equation set; According to the original detection signal, calculating to obtain initial periodic reference waveforms of the tire error signal and the load wheel error signal by adopting a periodic synchronous average method, taking the initial periodic reference waveforms as initial values, adopting a least square method to perform alternate optimization iterative solution on the linear equation set until iteration converges, and outputting the load wheel error signal and the tire error signal after separating the geometric errors of the load wheel. Further technical solution, the determining of the sampling points for one rotation of the tire and the load wheel includes: Determining sampling points of one circle of tire rotation according to a pulse signal output by a rotary encoder on a tire detection spindle during tire uniformity detection; And calculating the sampling point number of one rotation of the load wheel according to the sampling point number of one rotation of the tire and combining the distance between the load wheel and the main shaft of the tire and the radius of the load wheel. According to a further techn