Methods and related devices for predicting the service life of ball joint tie rods

Abstract

This invention relates to a method and related device for predicting the service life of a ball joint tie rod, belonging to the field of vehicle safety technology. The method includes: acquiring vibration signals of the ball joint tie rod during vehicle operation; converting the vibration signals into a frequency domain spectrum using a Fast Fourier Transform algorithm; determining the natural frequency of the ball joint tie rod based on the frequency domain spectrum; calculating the equivalent boundary condition coefficients of the ball joint tie rod based on the natural frequency, the structural parameters of the ball joint tie rod, and a preset equivalent boundary condition coefficient calculation formula; and determining the remaining service life of the ball joint tie rod based on the relationship between the equivalent boundary condition coefficients, the pre-acquired equivalent boundary condition coefficients, and the remaining service life of the ball joint tie rod. This invention can automatically and accurately predict the remaining service life of a ball joint tie rod.

Description

Technical Field

[0001] This invention relates to the field of vehicle safety technology, and in particular to a method and device for predicting the service life of a ball joint tie rod. Background Technology

[0002] As vehicles become more intelligent, the degree of electrification integration of automotive chassis components is increasing.

[0003] Currently, the steering tie rod and ball joint are connected via a ball joint mechanism. During use, they are in continuous contact under stress. As vehicle mileage increases, the ball joint is prone to wear, leading to abnormal noises and steering wheel looseness on rough roads, affecting the driving experience. With further wear, the ball joint can easily detach from the tie rod side under significant external force, causing serious vehicle accidents and compromising driving safety. Existing technology only allows manual assessment of the ball joint's wear when the vehicle is stationary. This requires highly skilled technicians and lacks objectivity in judging the wear level, potentially leading to inaccurate assessments. Furthermore, it cannot determine the wear of the ball joint in real time, posing a safety hazard.

[0004] Therefore, it is evident that the current technology can only judge the wear of the ball joint rod manually, which is not timely or accurate enough and poses a safety hazard. Summary of the Invention

[0005] In view of this, it is necessary to provide a method and related device for predicting the service life of ball joints, so as to solve the problem that the existing technology can only judge the wear of ball joints by manual means, which is not timely and accurate enough and poses safety hazards.

[0006] To address the aforementioned problems, in a first aspect, the present invention provides a method for predicting the service life of a ball joint tie rod, comprising: The vibration signal of the ball joint rod is acquired when the vehicle is in motion, and the vibration signal is converted into a frequency domain spectrum using the fast Fourier transform algorithm; The natural frequency of the ball joint is determined based on the frequency domain spectrum. The equivalent boundary condition coefficients of the ball joint are calculated based on the natural frequency, the structural parameters of the ball joint, and the preset equivalent boundary condition coefficient calculation formula. The remaining service life of the ball joint is determined based on the relationship between the equivalent boundary condition coefficients and the pre-collected equivalent boundary condition coefficients and the remaining service life of the ball joint.

[0007] In one possible implementation, the vibration signal of the ball joint lever is acquired when the vehicle is in motion, and the vibration signal is converted into a frequency domain spectrum using a Fast Fourier Transform algorithm, including: The vibration signal of the ball joint is collected by an accelerometer installed on the ball joint when the vehicle is in motion; The vibration signal is subjected to wavelet denoising, and the denoised vibration signal is subjected to fast Fourier transform to obtain the frequency domain spectrum.

[0008] In one possible implementation, the natural frequency of the ball joint is determined based on the frequency domain spectrum, including: Determine the peak points of each frequency in the frequency domain spectrum; The natural frequencies of the ball joint are determined based on the frequency of each frequency peak and the order of the frequency peaks.

[0009] The preset formula for calculating the equivalent boundary condition coefficients is:

[0010]

[0011] in, Let be the nth-order equivalent boundary condition coefficient of the ball joint, L be the effective length of the ball joint, and C be a constant defined by the material and cross-sectional dimensions of the ball joint. Let be the nth natural frequency of the ball joint, E be the elastic modulus of the ball joint material, and I be the moment of inertia of the ball joint cross section. Let be the material density of the ball joint, and A be the cross-sectional area of ​​the ball joint.

[0012] In one possible implementation, the process of determining the relationship between the pre-acquired equivalent boundary condition coefficients and the remaining service life of the ball joint includes: The natural frequencies of multiple ball joints are collected according to a fixed driving mileage, and the corresponding boundary condition coefficients are determined based on the natural frequencies. Calculate the difference between the maximum mileage of the ball joint tie rod and the mileage already traveled corresponding to each boundary condition coefficient to obtain the relationship between each boundary condition coefficient and the remaining service life of the ball joint tie rod.

[0013] In one possible implementation, the formula for calculating the remaining service life of the ball joint tie rod is:

[0014]

[0015] Where M represents the remaining equivalent mileage of the ball joint tie rod. The total equivalent travel distance of the ball-end tie rod. The equivalent mileage used for the ball-end tie rod. The wear time constant of the ball joint tie rod. For the ball-head tie rod, represents the real-time boundary condition coefficients. For the initial boundary condition coefficients of the ball-head tie rod, This represents the boundary condition coefficient when the ball joint fails.

[0016] In one possible implementation, after determining the remaining service life of the ball joint, the following is included: When the remaining service life is greater than or equal to the preset safe remaining service life threshold, a graded reminder is given based on the length of the remaining service life. When the remaining service life is less than the preset safe remaining service life threshold, the vehicle's power output is limited.

[0017] Secondly, the present invention also provides a ball joint tie rod life prediction device, comprising: The signal acquisition module is used to acquire the vibration signal of the ball joint rod when the vehicle is in motion, and uses the fast Fourier transform algorithm to convert the vibration signal into a frequency domain spectrum. The boundary coefficient determination module is used to determine the natural frequency of the ball joint based on the frequency domain spectrum, and to calculate the equivalent boundary condition coefficient of the ball joint based on the natural frequency, the structural parameters of the ball joint, and the preset equivalent boundary condition coefficient calculation formula. The remaining service life prediction module is used to determine the remaining service life of the ball joint based on the relationship between the equivalent boundary condition coefficients and the pre-collected equivalent boundary condition coefficients and the remaining service life of the ball joint.

[0018] Thirdly, the present invention also provides an electronic device, including a memory and a processor, wherein, Memory, used to store programs; A processor, coupled to a memory, is used to execute a program stored in the memory to implement the steps in the ball joint life prediction method of any of the above implementations.

[0019] Fourthly, the present invention also provides a computer-readable storage medium for storing a computer-readable program or instructions, which, when executed by a processor, can implement the steps in the ball joint life prediction method of any of the above implementations.

[0020] The beneficial effects of this invention are as follows: The ball joint tie rod life prediction method provided by this invention acquires the vibration signal of the ball joint tie rod when the vehicle is in motion, uses a fast Fourier transform algorithm to convert the vibration signal into a frequency domain spectrum, determines the natural frequency of the ball joint tie rod based on the frequency domain spectrum, calculates the equivalent boundary condition coefficient of the ball joint tie rod based on the natural frequency, the structural parameters of the ball joint tie rod, and a preset equivalent boundary condition coefficient calculation formula, transforming the unmeasurable wear of the ball joint tie rod into measurable equivalent boundary condition coefficients, realizing real-time prediction of ball joint tie rod wear, and determining the remaining life of the ball joint tie rod based on the relationship between the equivalent boundary condition coefficients and the pre-acquired equivalent boundary condition coefficients and the remaining life of the ball joint tie rod, realizing real-time prediction of the remaining life of the ball joint tie rod without manual intervention and with high accuracy. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A flowchart illustrating a method for predicting the service life of a ball joint tie rod according to an embodiment of the present invention; Figure 2 A flowchart illustrating a frequency domain spectrum construction method provided in an embodiment of the present invention; Figure 3 A flowchart illustrating a method for calculating inherent frequency provided in an embodiment of the present invention; Figure 4 A flowchart illustrating a method for determining the relationship between equivalent boundary condition coefficients and the remaining service life of a ball joint rod, provided in an embodiment of the present invention; Figure 5 A flowchart illustrating a reminder method provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of a ball joint tie rod life prediction device provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0023] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0024] In the description of the embodiments of the present invention, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0025] The terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a technical feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] A specific embodiment of the present invention, such as Figure 1 As shown, a method for predicting the service life of a ball joint tie rod is disclosed, including: S101: Acquire the vibration signal of the ball joint rod when the vehicle is in motion, and use the fast Fourier transform algorithm to convert the vibration signal into a frequency domain spectrum.

[0028] In this embodiment of the invention, vibration signals generated by the ball joint tie rod during actual vehicle operation are acquired. These vibration signals can be collected in real time by a vibration sensor installed at an appropriate location on the ball joint tie rod. The acquired raw vibration signals are time-domain data. To extract the frequency components reflecting structural characteristics, a Fast Fourier Transform (FFT) algorithm is used to convert the time-domain vibration signal into a frequency-domain spectral distribution map. Specifically, an accelerometer is installed on the ball joint tie rod housing or at an appropriate location near the ball joint pin. When the vehicle is driving on a normal road surface, this sensor continuously acquires the vibration signals of the ball joint tie rod under the combined effects of road surface excitation and engine vibration. The acquired signals are discrete time-series data. The acquired time-domain vibration signal data is sent to an onboard microprocessor or a dedicated signal processing module. This module has a built-in FFT algorithm, which converts the time-domain waveform into a frequency-domain power spectral density map.

[0029] S102, determine the natural frequency of the ball joint based on the frequency domain spectrum, and calculate the equivalent boundary condition coefficient of the ball joint based on the natural frequency, the structural parameters of the ball joint, and the preset equivalent boundary condition coefficient calculation formula.

[0030] In this embodiment of the invention, the natural frequency of the ball joint is identified and determined based on the converted frequency domain spectrum. The natural frequency is typically represented by the frequency value corresponding to the peak value with a significantly prominent amplitude in the spectrum, reflecting the dynamic characteristics of the ball joint in its current state. Subsequently, combining this natural frequency, the structural parameters of the ball joint itself, and a pre-defined formula for calculating the equivalent boundary condition coefficient, the current equivalent boundary condition coefficient of the ball joint is calculated. This coefficient is essentially a quantitative representation of the actual constraint state at the connection points of the two ends of the ball joint; its numerical change can indirectly reflect degradation conditions such as wear, increased clearance, or poor lubrication within the ball joint. Specifically, detailed structural parameters of the ball joint are obtained, including shaft length, moment of inertia, material elastic modulus, and density. The pre-defined formula for calculating the equivalent boundary condition coefficient describes the mathematical relationship between the natural frequency, structural parameters, and the equivalent boundary condition coefficient. Substituting the natural frequency and known structural parameters obtained in the previous step into the pre-defined formula for calculating the equivalent boundary condition coefficient, an equivalent boundary condition coefficient is output after numerical calculation. For example, when the ball joint is close to brand new, its boundary conditions are close to ideal fixed conditions, and the calculated coefficient value is high. As gaps or wear occur inside the ball joint, the boundary constraints weaken, and the coefficient value gradually decreases. The calculation formula for the equivalent boundary condition coefficient will be explained in detail later in this invention.

[0031] S103. The remaining service life of the ball joint is determined based on the relationship between the equivalent boundary condition coefficients and the pre-acquired equivalent boundary condition coefficients and the remaining service life of the ball joint.

[0032] In this embodiment of the invention, the equivalent boundary condition coefficients calculated in the previous step are compared with the correspondence between the equivalent boundary condition coefficients and the remaining service life of the ball joint tie rod obtained through experiments or historical data collection. This correspondence can be a standard curve, a data table, or an empirical model, which describes the evolution of the equivalent boundary condition coefficients with usage time or cumulative damage from a brand-new state to a failure state. By substituting the currently calculated coefficients into this correspondence, the proportion of the ball joint tie rod's already consumed service life can be inferred, thereby determining its remaining safe service life.

[0033] The ball joint tie rod life prediction method provided by this invention acquires the vibration signal of the ball joint tie rod during vehicle operation, uses a fast Fourier transform algorithm to convert the vibration signal into a frequency domain spectrum, determines the natural frequency of the ball joint tie rod based on the frequency domain spectrum, calculates the equivalent boundary condition coefficient of the ball joint tie rod based on the natural frequency, the structural parameters of the ball joint tie rod, and a preset equivalent boundary condition coefficient calculation formula, transforming the unmeasurable wear of the ball joint tie rod into measurable equivalent boundary condition coefficients, realizing real-time prediction of ball joint tie rod wear, and determines the remaining life of the ball joint tie rod based on the relationship between the equivalent boundary condition coefficients, the pre-acquired equivalent boundary condition coefficients, and the remaining life of the ball joint tie rod, achieving real-time prediction of the remaining life of the ball joint tie rod without manual intervention and with high accuracy.

[0034] In some possible embodiments of the present invention, such as Figure 2 As shown, the vibration signal of the ball joint rod is acquired when the vehicle is in motion. The vibration signal is then converted into a frequency domain spectrum using a Fast Fourier Transform algorithm, including: S201, based on a triaxial accelerometer mounted on the ball joint rod to collect vibration signals of the ball joint rod when the vehicle is in motion; S202 performs wavelet denoising on the vibration signal and then performs a fast Fourier transform on the denoised vibration signal to obtain the frequency domain spectrum.

[0035] In this embodiment of the invention, a triaxial accelerometer is installed on the housing of the ball joint or on a rigid part near the ball joint pin. This sensor can simultaneously acquire vibration acceleration signals generated by the ball joint along three mutually perpendicular directions in space during vehicle movement. Compared to a single-axis sensor, the triaxial accelerometer can more comprehensively capture the vibration response of the ball joint in different force directions, avoiding the loss of key feature information due to deviation of the vibration direction from the sensitive axis. The raw vibration signal acquired by the triaxial accelerometer is preprocessed, with wavelet denoising being a key step. Due to the complex driving environment, the raw vibration signal inevitably contains background noise from the engine, transmission, tire and road impacts, and other adjacent components. Wavelet denoising utilizes the multi-resolution characteristics of wavelet transform to decompose the signal into different scales, effectively distinguishing between real vibration features and random noise. Specifically, an appropriate wavelet basis function and decomposition level are selected, and the acquired time-domain signal is decomposed using wavelets. Then, the high-frequency coefficients of each level are quantized using soft or hard thresholding methods to filter out noise components. Finally, the denoised vibration signal is obtained through wavelet reconstruction. This processing significantly improves the signal-to-noise ratio while preserving the subtle vibration components related to the dynamic characteristics of the ball joint structure. A Fast Fourier Transform (FFT) is performed on the clean vibration signal after wavelet denoising. Since the triaxial accelerometer outputs signals in three directions, an FFT can be performed separately for each direction to obtain the vibration spectrum for each direction; alternatively, the signals from the three directions can be combined into a single scalar signal before the FFT. The resulting vibration spectrum clearly shows the relationship between frequency and amplitude, with the peak value corresponding to the natural frequency determined by the ball joint structure itself being more prominent and stable. This provides a reliable data foundation for accurately identifying the natural frequency and calculating the equivalent boundary condition coefficients.

[0036] This invention improves the robustness and accuracy of the service life prediction method by denoising the vibration signal, enabling stable extraction of the true vibration characteristics of the ball joint rod even in a strong noise background.

[0037] In some possible embodiments of the present invention, such as Figure 3 As shown, determining the natural frequency of the ball joint based on the frequency domain spectrum includes: S301, determine the peak points of each frequency in the frequency domain spectrum; S302, determine the natural frequencies of each ball joint based on the frequency of each frequency peak point and the order of each frequency peak point.

[0038] In this embodiment of the invention, peak detection is performed on the vibration spectrum. Specifically, the amplitude data across the entire frequency domain is scanned to identify all local maxima, i.e., points whose amplitudes are higher than their adjacent frequencies. These points are called frequency peaks. To avoid false peaks caused by minor noise fluctuations, an amplitude threshold or minimum peak height condition can be set, retaining only peaks whose amplitudes exceed the threshold. For the three directions acquired by the triaxial accelerometer, the spectrum of each direction can be processed separately, or the spectra of the three directions can be fused before unified peak detection. Then, based on the frequency values ​​of each detected frequency peak, they are sorted in ascending order. Each frequency peak corresponds to a natural vibration mode of the ball joint. Typically, the smallest frequency value corresponds to the first natural frequency, which is the bending or oscillating mode of the ball joint at its lowest natural frequency; the second smallest frequency value corresponds to the second natural frequency, which may be a higher-order bending or torsional mode; and so on. Therefore, by following the natural order of frequency values ​​from small to large, the first, second, and third natural frequencies of the ball joint can be determined.

[0039] In practical engineering applications, the first few natural frequencies of ball joints, especially the first and second, are most sensitive to changes in boundary conditions. Therefore, the first natural frequency or a weighted combination of the first two natural frequencies can be selected as the natural frequency value used in subsequent calculations of equivalent boundary condition coefficients, depending on the needs. For example, the first natural frequency with the most prominent and stable amplitude should be used first; if the first peak value is disturbed, the second natural frequency can be used as a supplement.

[0040] The embodiments of the present invention can systematically and reliably extract the multi-order natural frequencies of ball joint rods from vibration spectrum diagrams, providing key input parameters for accurately calculating equivalent boundary condition coefficients, thereby further improving the stability and adaptability of service life prediction.

[0041] In some possible embodiments of the present invention, based on the Euler-Bernoulli beam theory, the formula for calculating the natural frequency of the ball joint tie rod can be derived as follows:

[0042]

[0043] in, Let be the nth natural frequency of the ball-head tie rod. Let be the nth-order equivalent boundary condition coefficient of the ball joint, and C be a constant defined by the material and cross-sectional dimensions of the ball joint. Let E be the effective length of the steering tie rod, E be the elastic modulus of the ball joint material, and I be the moment of inertia of the ball joint section. Let be the material density of the ball joint, and A be the cross-sectional area of ​​the ball joint.

[0044] By combining the two formulas above, we can deduce the formula for calculating the equivalent boundary condition coefficients as follows:

[0045] Since L and C are both constants, the corresponding equivalent boundary condition coefficients can be calculated after determining the natural frequency of the ball joint.

[0046] In some possible embodiments of the present invention, such as Figure 4 As shown, the process of determining the relationship between the pre-collected equivalent boundary condition coefficients and the remaining service life of the ball joint rod includes: S401: Collect the natural frequencies of multiple ball joints according to a fixed driving mileage, and determine the corresponding boundary condition coefficients based on the natural frequencies; S402, calculate the difference between the maximum mileage of the ball joint tie rod and the mileage already traveled corresponding to each boundary condition coefficient, and obtain the relationship between each boundary condition coefficient and the remaining mileage of the ball joint tie rod.

[0047] In some possible embodiments of the present invention, when determining the relationship between the equivalent boundary condition coefficient and the remaining service life of the ball joint rod, multiple ball joint rods of the same model and batch are selected as samples. These ball joint rods are installed on a dedicated bench fatigue testing device or on multiple identical test vehicles, and driving tests are conducted on actual or simulated roads. During the test, data is collected for each ball joint rod at fixed mileage intervals. Each time data is collected, the vibration signal at that mileage is obtained according to the method described in the previous embodiments, and the frequency domain spectrum is obtained through fast Fourier transform to determine the natural frequency of the ball joint rod at that moment. Then, using the natural frequency, the structural parameters of the ball joint rod, and the preset equivalent boundary condition coefficient calculation formula, the equivalent boundary condition coefficient corresponding to the natural frequency is calculated. In this way, each ball joint rod will obtain a series of paired data throughout its entire life cycle from brand new to reaching the failure standard; that is, each fixed mileage interval corresponds to an equivalent boundary condition coefficient. The mileage traveled at each sampling point is recorded. For each ball joint rod, its maximum mileage is determined experimentally. The maximum mileage refers to the total mileage accumulated by the ball joint rod from its brand-new state until its performance degrades to the point where it can no longer meet safety requirements. This value can be directly read from the actual mileage at the end of the test. Then, for each sampling point of the ball joint rod, its corresponding remaining mileage is calculated, that is, the maximum mileage of the ball joint rod minus the mileage already traveled at that sampling point. In this way, each sampling point corresponds to two quantities: one is the equivalent boundary condition coefficient measured at the sampling point, and the other is the remaining mileage of the ball joint rod at that sampling point. Finally, the data from all sampling points of multiple ball joint rods are aggregated, and the data is fitted or a mapping table is created with the equivalent boundary condition coefficient as the horizontal axis and the remaining mileage as the vertical axis. Since the degradation patterns of multiple ball joint rods are consistent, these data points will show a clear negative correlation trend: the larger the equivalent boundary condition coefficient, the tighter the ball joint connection, the less wear, and the longer the remaining mileage; the smaller the equivalent boundary condition coefficient, the more severe the ball joint wear, the larger the gap, and the shorter the remaining mileage. By curve fitting or piecewise linear interpolation, a standard relationship curve or a lookup table can be obtained, which represents the correspondence between the equivalent boundary condition coefficients and the remaining mileage of the ball joint tie rod.

[0048] In this embodiment of the invention, based on the experiments in the foregoing embodiments, the mileage already traveled can be obtained ( l The curve relationship between the boundary condition coefficients and the corresponding boundary condition coefficients is as follows:

[0049] in, For driving lBoundary condition coefficients after kilometers.

[0050] Furthermore, the formula for calculating the remaining service life of the ball joint tie rod is as follows:

[0051]

[0052] Where M represents the remaining equivalent mileage of the ball joint tie rod. The total equivalent travel distance of the ball-end tie rod. The equivalent mileage used for the ball-end tie rod. The wear time constant of the ball joint tie rod. For the ball-head tie rod, represents the real-time boundary condition coefficients. For the initial boundary condition coefficients of the ball-head tie rod, This represents the boundary condition coefficient when the ball joint fails.

[0053] In some possible embodiments of the present invention, such as Figure 5 As shown, after determining the remaining service life of the ball joint tie rod, the following steps are included: S501, when the remaining service life is greater than or equal to the preset safe remaining service life threshold, a graded reminder is given based on the length of the remaining service life; S502, when the remaining service life is less than the preset safe remaining service life threshold, the power output of the vehicle is limited.

[0054] In some possible embodiments of this invention, a preset safe remaining service life threshold is established. This threshold can be determined comprehensively based on factors such as the material properties of the ball joint rod, the design safety factor, and the vehicle's operating conditions. For example, it can be set to 500 kilometers or 1,000 kilometers. When the calculated remaining service life is greater than or equal to this preset threshold, it indicates that the ball joint rod is currently in a relatively safe state. However, the urgency varies depending on the specific value of the remaining service life. Therefore, the system provides tiered reminders based on the length of the remaining service life. When the remaining service life is long, the system only displays a text or icon in the information display area of ​​the vehicle's dashboard indicating that the ball joint rod's lifespan is normal, without needing to trigger an alarm. When the remaining service life is in the medium range, a yellow warning icon is displayed on the dashboard, accompanied by a low-frequency beep or a short reminder after a certain mileage, reminding the driver to pay attention and plan for maintenance. When the remaining service life is close to but not yet below the safe threshold, a red warning icon is displayed, accompanied by a more frequent beep or voice prompt indicating that the ball joint rod's lifespan is about to end and should be replaced as soon as possible. Through this tiered reminder method, the driver can intuitively understand the urgency of the component's condition and rationally schedule maintenance time. Furthermore, when the predicted remaining service life is less than the preset safe remaining service life threshold, it indicates that the ball joint linkage has entered a high-risk zone. If normal driving continues, it may fail within a short period of time, seriously threatening driving safety. At this time, the system automatically sends a limiting command to the vehicle controller to restrict the vehicle's power output. The limiting methods may include, but are not limited to, reducing the maximum output power or torque of the engine or drive motor, limiting the vehicle's maximum speed to a lower safe speed; or forcing the vehicle into limp-home mode, allowing it to drive only at idle or very low speeds, so that the driver can slowly drive the vehicle off the main road and move it to a safe area or the nearest repair shop. At the same time, the highest level red flashing warning message is continuously displayed on the instrument panel, and a continuous alarm sound is emitted.

[0055] This invention applies beam vibration theory to the monitoring of wear on steering tie rod ball joints, transforming the immeasurable wear into quantifiable driving range, thus solving the problem that traditional technologies cannot assess the degree of wear. Furthermore, this invention combines experimentally calibrated theoretical models with actual driving data, enabling quantitative calculation of wear monitoring rather than simply assessing it, and providing early warnings, thereby improving overall vehicle driving safety.

[0056] To better implement the ball joint tie rod life prediction method in this embodiment of the invention, based on the ball joint tie rod life prediction method, correspondingly, as follows: Figure 6 As shown, this embodiment of the invention also provides a ball joint tie rod life prediction device, the ball joint tie rod life prediction device 600 comprising: The signal acquisition module 601 is used to acquire the vibration signal of the ball joint rod when the vehicle is in motion, and uses the fast Fourier transform algorithm to convert the vibration signal into a frequency domain spectrum. The boundary coefficient determination module 602 is used to determine the natural frequency of the ball joint based on the frequency domain spectrum, and to calculate the equivalent boundary condition coefficient of the ball joint based on the natural frequency, the structural parameters of the ball joint, and the preset equivalent boundary condition coefficient calculation formula. The remaining service life prediction module 603 is used to determine the remaining service life of the ball joint based on the relationship between the equivalent boundary condition coefficient and the pre-acquired equivalent boundary condition coefficient and the remaining service life of the ball joint.

[0057] The ball joint life prediction device 600 provided in the above embodiments can realize the technical solutions described in the ball joint life prediction method embodiments. The specific implementation principles of each module or unit can be found in the corresponding content in the ball joint life prediction method embodiments, which will not be repeated here.

[0058] like Figure 7 As shown, the present invention also provides an electronic device 700. The electronic device 700 includes a processor 701, a memory 702, and a display 703. Figure 7 Only some components of the electronic device 700 are shown, but it should be understood that it is not required to implement all the components shown, and more or fewer components may be implemented instead.

[0059] In some embodiments, processor 701 may be a central processing unit (CPU), a microprocessor, or other data processing chip, used to run program code stored in memory 702 or process data, such as the ball joint tie rod life prediction method of the present invention.

[0060] In some embodiments, processor 701 may be a single server or a group of servers. The server group may be centralized or distributed. In some embodiments, processor 701 may be local or remote. In some embodiments, processor 701 may be implemented on a cloud platform. In some embodiments, the cloud platform may include a private cloud, public cloud, hybrid cloud, community cloud, distributed cloud, internal cloud, multi-cloud, or any combination thereof.

[0061] In some embodiments, memory 702 may be an internal storage unit of electronic device 700, such as a hard disk or memory of electronic device 700. In other embodiments, memory 702 may also be an external storage device of electronic device 700, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on electronic device 700.

[0062] Furthermore, the memory 702 may include both internal storage units of the electronic device 700 and external storage devices. The memory 702 is used to store application software and various types of data installed on the electronic device 700.

[0063] In some embodiments, display 703 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 703 is used to display information from electronic device 700 and to display a visual user interface. Components 701-703 of electronic device 700 communicate with each other via a system bus.

[0064] In some embodiments, when processor 701 executes the ball joint life prediction program in memory 702, the following steps may be performed: The vibration signal of the ball joint rod is acquired when the vehicle is in motion, and the vibration signal is converted into a frequency domain spectrum using the fast Fourier transform algorithm; The natural frequency of the ball joint is determined based on the frequency domain spectrum. The equivalent boundary condition coefficients of the ball joint are calculated based on the natural frequency, the structural parameters of the ball joint, and the preset equivalent boundary condition coefficient calculation formula. The remaining service life of the ball joint is determined based on the relationship between the equivalent boundary condition coefficients and the pre-collected equivalent boundary condition coefficients and the remaining service life of the ball joint.

[0065] It should be understood that when the processor 701 executes the ball joint life prediction program in the memory 702, in addition to the functions mentioned above, it can also perform other functions, as detailed in the description of the corresponding method embodiments above.

[0066] Furthermore, this embodiment of the invention does not specifically limit the type of electronic device 700 mentioned. Electronic device 700 can be a mobile phone, tablet computer, personal digital assistant (PDA), wearable device, laptop computer, or other portable electronic device. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices running iOS, Android, Microsoft, or other operating systems. The aforementioned portable electronic device can also be other portable electronic devices, such as a laptop computer with a touch-sensitive surface (e.g., a touch panel). It should also be understood that in some other embodiments of the invention, electronic device 700 may not be a portable electronic device, but rather a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0067] Accordingly, this application also provides a computer-readable storage medium for storing computer-readable programs or instructions. When the programs or instructions are executed by a processor, they can implement the steps or functions in the ball joint life prediction method provided in the above-described method embodiments.

[0068] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for predicting the service life of a ball joint tie rod, characterized by, include: The vibration signal of the ball joint rod is acquired when the vehicle is in motion, and the vibration signal is converted into a frequency domain spectrum using a fast Fourier transform algorithm; The natural frequency of the ball joint is determined based on the frequency domain spectrum, and the equivalent boundary condition coefficient of the ball joint is calculated based on the natural frequency, the structural parameters of the ball joint, and the preset equivalent boundary condition coefficient calculation formula. The remaining service life of the ball joint is determined based on the relationship between the equivalent boundary condition coefficients and the pre-collected equivalent boundary condition coefficients and the remaining service life of the ball joint.

2. The ball head drawbar service life prediction method according to claim 1, characterized by, The process of acquiring the vibration signal of the ball joint linkage during vehicle operation and converting the vibration signal into a frequency domain spectrum using a Fast Fourier Transform algorithm includes: The vibration signal of the ball joint is collected by an accelerometer installed on the ball joint when the vehicle is in motion; The vibration signal is subjected to wavelet denoising processing, and the denoised vibration signal is subjected to fast Fourier transform to obtain the frequency domain spectrum.

3. The ball head drawbar service life prediction method according to claim 1, characterized by, Determining the natural frequency of the ball joint based on the frequency domain spectrum includes: Determine each frequency peak point in the frequency domain spectrum; The natural frequencies of the ball joint are determined based on the frequency of each frequency peak and the order of the frequency peaks.

4. The ball head drawbar service life prediction method according to claim 3, characterized by, The preset formula for calculating the equivalent boundary condition coefficients is as follows: in, Let L be the nth-order equivalent boundary condition coefficient of the ball joint, L be the effective length of the ball joint, and C be a constant defined by the material and cross-sectional dimensions of the ball joint. Let be the nth natural frequency of the ball joint, E be the elastic modulus of the material of the ball joint, and I be the moment of inertia of the cross section of the ball joint. Let A be the material density of the ball joint rod, and let A be the cross-sectional area of ​​the ball joint rod.

5. The method for predicting the service life of a ball joint tie rod according to claim 1, characterized in that, The process of determining the relationship between the pre-collected equivalent boundary condition coefficients and the remaining service life of the ball joint rod includes: The natural frequencies of multiple ball joints are collected according to a fixed driving mileage, and the corresponding boundary condition coefficients are determined based on the natural frequencies. Calculate the difference between the maximum mileage of the ball joint and the mileage already traveled corresponding to each of the boundary condition coefficients to obtain the relationship between each of the boundary condition coefficients and the remaining service life of the ball joint.

6. The ball head drawbar service life prediction method according to claim 5, characterized by, The formula for calculating the remaining service life of the ball joint is as follows: Where M is the remaining equivalent mileage of the ball joint lever. This represents the total equivalent travel distance of the ball joint. The equivalent mileage used for the ball joint tie rod. The wear time constant of the ball joint rod is given. The real-time boundary condition coefficients for the ball joint are given. Let be the initial boundary condition coefficients of the ball joint. is the boundary condition coefficient when the ball joint fails.

7. The ball head drawbar service life prediction method according to claim 1, characterized by, After determining the remaining service life of the ball joint, the process includes: When the remaining service life is greater than or equal to the preset safe remaining service life threshold, a graded reminder is given based on the length of the remaining service life. When the remaining service life is less than a preset safe remaining service life threshold, the power output of the vehicle is limited.

8. A device for predicting the service life of a ball joint tie rod, characterized in that, include: The signal acquisition module is used to acquire the vibration signal of the ball joint rod when the vehicle is in motion, and uses the fast Fourier transform algorithm to convert the vibration signal into a frequency domain spectrum; The boundary coefficient determination module is used to determine the natural frequency of the ball joint based on the frequency domain spectrum, and to calculate the equivalent boundary condition coefficient of the ball joint based on the natural frequency, the structural parameters of the ball joint, and a preset equivalent boundary condition coefficient calculation formula. The remaining service life prediction module is used to determine the remaining service life of the ball joint based on the relationship between the equivalent boundary condition coefficients and the pre-collected equivalent boundary condition coefficients and the remaining service life of the ball joint.

9. An electronic device, comprising: Including memory and processor, among which, The memory is used to store programs; The processor, coupled to the memory, is used to execute the program stored in the memory to implement the steps in the ball joint life prediction method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, Used to store computer-readable programs or instructions, which, when executed by a processor, can perform the steps in the ball joint life prediction method according to any one of claims 1 to 7.

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