A method and system for analyzing vibration transmission path of air-jet loom frame

Abstract

The present invention proposes a vibration transfer path analysis method and system for an air jet loom frame. The method includes the following steps: obtaining acceleration signals of a target reference point, a vibration source path input connection, and a vibration source under operating conditions; removing an active end excitation source, hammering the passive end positions of the left and right wall panel excitation points, performing a system frequency response function test, and filtering the vibration data of the response points to obtain a system frequency response function; defining a vibration transmission path from the excitation source through a connector to a target response point, and establishing a vibration transfer path analysis model for the air jet loom; identifying the model to calculate operating condition loads; obtaining a path contribution for each target point by multiplying the passive end load by the corresponding path frequency response function; and comparing the contribution of each path to determine a vibration-sensitive path. This method can introduce filtering processing and insert correction parameters under ultra-high-speed operating conditions, thereby improving the precision and accuracy of vibration transfer path analysis.

Description

Technical Field

[0001] The present invention relates to the technical field of textile machinery vibration analysis, and in particular to a method and system for analyzing the vibration transfer path of an air jet loom frame. Background Art

[0002] Air-jet looms are important equipment in the modern textile industry, characterized by high speed and high efficiency. With the increasing demand for textiles and higher requirements for production efficiency, the speed of air-jet looms has continued to increase, reaching ultra-high-speed operation. However, the vibration problem caused by high-speed operation has become a key factor restricting the performance and life of the loom, especially in the frame structure. Vibration can cause structural fatigue, increased noise, and reduced fabric quality. Therefore, by accurately identifying vibration-sensitive paths, a basis for vibration reduction optimization is provided.

[0003] Publication number CN108593092A discloses a high-end textile machinery noise identification method based on transfer path analysis, which includes the following steps: measuring the frequency response function of the transfer paths of multiple excitation sources; measuring the sound pressure and workload under working conditions; and calculating the noise contribution based on the acceleration of the excitation source, the sound pressure under working conditions, and the workload.

[0004] However, in high-speed air-jet looms, vibrations from vibration sources such as the motor and cam are transmitted to the frame structure through different paths, thereby affecting the overall performance of the loom. Traditional vibration analysis methods are difficult to accurately capture complex vibration transmission paths, especially under ultra-high-speed conditions. Vibration signals are complex and easily interfered by noise, and the yarn tension when the moving components are working will also affect the experimental data, thereby reducing the precision and accuracy of the vibration transmission path analysis. Summary of the Invention

[0005] In view of this, the present invention proposes a vibration transfer path analysis method and system for an air-jet loom frame, which can filter interference noise under ultra-high-speed operation conditions, accurately capture complex vibration transfer paths, and insert correction parameters to correct the influence of yarn tension, thereby improving the precision and accuracy of vibration transfer path analysis.

[0006] The technical solution of the present invention is implemented as follows: In a first aspect, the present invention provides a method for analyzing the vibration transmission path of an air jet loom frame, comprising the following steps:

[0007] S1, obtain the acceleration signals of the target reference point, the vibration source path input connection point and the vibration source under the working condition;

[0008] S2, remove the active end excitation source, hammer the passive end position of the left and right wall panels, perform system frequency response function test, filter the vibration data of the response point, and obtain the system frequency response function;

[0009] S3, using the main motor, cam box, small pulley and large pulley as excitation sources, the suspension element as the connecting piece, and the passive end of the wall panel as the target response point, defines the vibration transmission path from the excitation source through the connecting piece to the target response point, and establishes a vibration transmission path analysis model for the air jet loom;

[0010] S4, introducing yarn tension and air damping correction parameters to modify the dynamic stiffness model of the suspension element, and based on the modified dynamic stiffness model, calculating the structural vibration load force transmitted from the suspension element to the passive end;

[0011] S5: Multiply the structural vibration load force at the passive end by the frequency response function of the corresponding path to calculate the contribution of each path. Compare the contributions of each path and take the path with the largest contribution as the vibration-sensitive path.

[0012] On the basis of the above technical solution, preferably, the acceleration signals of the target reference point, the vibration source path input connection and the vibration source under the working condition are obtained in step S1, wherein acceleration sensors are arranged at the motor, cam box, beating-up mechanism, opening mechanism, warp let-off mechanism and main shaft vibration source, as well as the passive ends of the left wall panel and the right wall panel and the loom response point. When the air jet loom is in operation, vibration signals at different speeds are collected to obtain the vibration amplitude frequency in the X, Y and Z directions, and the root mean square value of the vibration acceleration is calculated for evaluating the vibration state of the loom.

[0013] Based on the above technical solution, preferably, in step S2, the active end excitation source is removed, the passive end positions of the left and right wall panels are hammered, a system frequency response function test is performed, vibration response data of each response point is collected, and the vibration response data is filtered to obtain the frequency response function of the system, which includes the following sub-steps:

[0014] S21, dividing the moving components of the air jet loom into a shedding mechanism, a beating-up mechanism, and a warp let-off mechanism, and setting corresponding attenuation coefficients according to their respective positions corresponding to the air jet loom frame;

[0015] S22, by regulating the loom system to control the movement of individual mechanisms, install acceleration sensors at the measurement points of each mechanism, hammer the passive end positions of the left and right wall panels, collect vibration response data of the air jet loom under various working conditions, and use a low-pass filter to filter the vibration response data to establish the corresponding system frequency response function.

[0016] On the basis of the above technical solution, preferably, the system frequency response function expression is:

[0017]

[0018] Where, f ( t ) is the air jet loomt The system frequency response function corresponding to the time is, a is the attenuation coefficient of the opening mechanism from the frame, U ( t ) is the frequency response data matrix of the opening mechanism, b is the attenuation coefficient of the beating-up mechanism from the frame, L ( t ) is the frequency response data matrix of the beating-up mechanism, c is the attenuation coefficient of the warp let-off mechanism from the frame, P ( t ) is the frequency response data matrix of the let-off mechanism;

[0019] in,

[0020]

[0021] in:

[0022] ;

[0023] ;

[0024] ;

[0025] Where, U ( t ) contains the frequency response functions of each observation point in the opening mechanism under different excitation source inputs, L ( t ) contains the frequency response functions of each observation point in the beating mechanism under different excitation source inputs, P ( t ) contains the frequency response functions of each observation point in the let-off mechanism under different excitation source inputs, u ij (t) is t Moment j When the excitation source is input, the corresponding i The frequency response function output by each observation point is l ij (t) is the first j When the excitation source is input, the corresponding i The frequency response function output by each observation point is p ij (t) is the first j When the excitation source is input, the corresponding i The frequency response function output by each observation point is t For time, jt ui For the first j The frequency response value of the output, jtli It is the first j The frequency response value of the output, jt pi For the opening mechanism j The frequency response value of the output, t c is the cutoff frequency, t c is the cutoff frequency.

[0026] On the basis of the above technical solution, preferably, the suspension element includes a connecting part and a vibration source support of the loom, the connecting part is a rigid connecting part, each connecting part includes a vibration source mounting side mounting point and a wall panel side mounting point, the vibration source support includes a cam box support and a motor support, each vibration source support includes a vibration source mounting side mounting point and a wall panel side mounting point, wherein the vibration source mounting side mounting point is the active end and the wall panel side mounting point is the passive end.

[0027] On the basis of the above technical solution, preferably, the yarn tension and air damping correction parameters are introduced in step S4 to correct the dynamic stiffness model of the suspension element, and the expression is:

[0028]

[0029] Where, m ix For the i The weft yarn on the path x The kinetic mass in the direction, m iy For the i The warp yarns on the path y The kinetic mass in the direction, c iax For the i On the path x Directional air damping coefficient, c iay For the i On the path y Directional air damping coefficient, k i For the i The static stiffness of the yarn suspended on the path, λ1 is the correction parameter for the air damping generated when the yarn moves in the airflow, and λ2 is the correction parameter for the static stiffness under the influence of the yarn. oh is the frequency.

[0030] On the basis of the above technical solution, preferably, the calculation of the structural vibration load force transmitted from the suspension element to the passive end based on the modified dynamic stiffness model in step S4 includes the following steps:

[0031] According to the modified dynamic stiffness model, the structural vibration load force transmitted from the suspension element to the passive end is calculated as follows:

[0032]

[0033] Where, F i ( oh ) is the frequency ω applied to the i The structural vibration load force on each degree of freedom is a ai ( oh ) is the active end at frequency oh The acceleration under a pi ( oh ) is the passive end at frequency oh The acceleration under K i ( oh ) is the dynamic stiffness of the suspension element;

[0034] The vibration load of the air jet loom structure is calculated using the suspension dynamic stiffness method, and the dynamic response of multiple degrees of freedom is obtained, which is expressed as:

[0035]

[0036] Where, u q ( oh ) is the frequency oh Next system q degrees of freedom response, H qi ( oh ) is the frequency response function, which means i When a unit force is applied to each degree of freedom, q degrees of freedom response, F i ( oh ) is the frequency ω applied to the i The structural vibration load force on each degree of freedom is n is the total number of degrees of freedom in the system;

[0037] Substituting the calculation expression of the structural vibration load force transmitted by the suspension element to the passive end and the modified dynamic stiffness model into the calculation expression of the dynamic response of different degrees of freedom, the dynamic response of the system is obtained as follows:

[0038]

[0039] Where, G qi ( oh) is the dynamic response of the system after the formula changes, expressed as oh The response of the system to the input force;

[0040] The dynamic response of the system is converted into the system linear matrix equation, which is expressed as:

[0041] ;

[0042] The linear matrix equation of the system is solved using the least squares method to obtain the dynamic coefficients of each suspension element. m i , damping coefficient c i Static stiffness k i The values ​​are substituted into the structural vibration load force expression transmitted by the suspension element to the passive end and the dynamic stiffness model of the modified suspension element, respectively, and the structural vibration load force transmitted by the suspension element to the passive end is calculated.

[0043] Based on the above technical solution, preferably, in step S5, the structural vibration load force of the passive end is multiplied by the frequency response function of the corresponding path to calculate the contribution of each path, where the expression is:

[0044]

[0045] Where, y k ( oh ) represents the transfer path contribution, H ki ( oh ) is from i Input point to k The frequency response function of the target point is expressed in i When a unit force is applied to the input point, k Target points at frequencies oh The following response.

[0046] In a second aspect, the present invention further provides a system for analyzing the vibration transfer path of an air jet loom frame, which is implemented using the above-mentioned method for analyzing the vibration transfer path of an air jet loom frame, and the system comprises:

[0047] An acquisition module is used to obtain acceleration signals of the target reference point, the vibration source path input connection, and the vibration source under working conditions;

[0048] The simulation test module is used to remove the active end excitation source, hammer the passive end positions of the left and right wall panels, perform system frequency response function testing, and filter the vibration data of the response point to obtain the system frequency response function;

[0049] The modeling module is used to define the vibration transmission path from the excitation source through the connector to the target response point, using the main motor and cam box as the excitation source, the suspension element as the connector, and the passive end of the wall panel as the target response point, thereby establishing a vibration transmission path analysis model for the air jet loom.

[0050] a calculation module for introducing yarn tension and air damping correction parameters to correct the dynamic stiffness model of the suspension element, and calculating the structural vibration load force transmitted from the suspension element to the passive end based on the corrected dynamic stiffness model;

[0051] The determination module is used to multiply the structural vibration load force at the passive end by the frequency response function of the corresponding path, calculate the contribution of each path, compare the contribution of each path, and select the path with the largest contribution as the vibration sensitive path.

[0052] In a third aspect, the present invention also provides a computer-readable storage medium, on which is stored a program for analyzing a vibration transfer path of a jet loom frame. When the program for analyzing a vibration transfer path of a jet loom frame is executed, the above-mentioned method for analyzing a vibration transfer path of a jet loom frame is implemented.

[0053] The air jet loom frame vibration transmission path analysis method and system of the present invention have the following beneficial effects compared with the prior art:

[0054] (1) By collecting the acceleration signals of the ultra-high-speed air-jet loom under working conditions, the transmission path model is established and corrected, and the frame vibration transmission path is accurately analyzed. The accurate identification of the vibration sensitive path is achieved, which not only improves the accuracy of vibration analysis, but also provides support for the vibration reduction optimization of the loom, effectively improving the performance and life of the loom;

[0055] (2) By setting the attenuation coefficient and individually controlling the movement of the mechanism, the influence of each component on the system vibration can be more accurately evaluated. The vibration response of each motion mechanism can be measured, and the relevant frequency response function can be calculated for overall vibration signal filtering to filter out the vibration influence of the motion system and obtain a more accurate vibration signal of the excitation source, effectively reducing the vibration interference of the motion component, improving the authenticity of the transmission path signal, and providing data support for subsequent working condition load calculations.

[0056] (3) By introducing the yarn tension and air damping correction parameters, the model can more comprehensively consider the various physical effects in the working process of the air jet loom, so that the model can more accurately describe the dynamic behavior of the yarn, thereby improving the accuracy of the model. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0058] Figure 1 Flowchart of a method for analyzing vibration transmission path of an air jet loom frame according to the present invention;

[0059] Figure 2 Schematic diagram of a vibration transmission path framework of a method for analyzing vibration transmission path of an air jet loom frame according to the present invention;

[0060] Figure 3 Schematic diagram of the vibration transmission path structure in an example of a vibration transmission path analysis method for an air jet loom frame according to the present invention;

[0061] Figure 4 The figure is a schematic diagram of the vibration transmission path structure in another example of the method for analyzing the vibration transmission path of an air jet loom frame according to the present invention. DETAILED DESCRIPTION

[0062] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0063] like Figure 1-4 As shown, a method for analyzing vibration transmission path of an air jet loom frame of the present invention comprises the following steps:

[0064] S1, obtain the acceleration signals of the target reference point, the vibration source path input connection point and the vibration source under the working condition.

[0065] In step S1, acceleration sensors are arranged at the motor, cam box, beating-up mechanism, shedding mechanism, warp let-off mechanism, main shaft vibration source, passive ends of the left and right wall panels, and loom response points. When the air-jet loom is in operation, vibration signals at different speeds are collected to obtain vibration amplitudes and frequencies in the X, Y, and Z directions, and the root mean square value of the vibration acceleration is calculated to evaluate the vibration state of the loom.

[0066] Specifically, an SCM2E05 LMS acquisition system and three piezoelectric accelerometers were used to collect acceleration signals with a sampling frequency of 1024 Hz and a test frequency range of 0-512 Hz. Sensors were arranged at various points, including basic vibration sources such as motors and cams, motion vibration sources such as the beating-up mechanism, opening mechanism, and main shaft, passive ends such as the middle and lower sides of the left and right wall panels, and four evaluation reference points in the front and back of the left and right wall panels. When the ultra-high-speed air-jet loom was in operation, the LMS software was used to monitor and record the vibration amplitude and frequency in the X, Y, and Z directions at different speeds of 500-1000 rpm, and the root mean square value of the integrated vibration acceleration was processed and calculated.

[0067] It should be noted that acceleration sensors are arranged at key locations, including vibration sources such as the motor, cam box, beating-up mechanism, shedding mechanism, warp let-off mechanism, and main shaft, as well as the passive ends of the left and right wall panels and the loom response points, to comprehensively monitor the vibration generated by the air-jet loom during operation, thereby accurately evaluating its vibration state. The sampling frequency is set to 1024 Hz to ensure that high-frequency vibration signals can be captured. The test frequency range covers 0-512 Hz, covering the main vibration frequencies of the air-jet loom during operation. When the ultra-high-speed air-jet loom is in operation, the vibration signals at different speeds are monitored and recorded. The vibration amplitude frequency in the X, Y, and Z directions is recorded, representing the vibration of the loom in the horizontal, vertical, and front-to-back directions, respectively. The collected vibration signals are processed, and the root mean square value of the vibration acceleration at each point in each direction is calculated. This vibration evaluation index can reflect the energy and intensity of the vibration, and thus the vibration state of the air-jet loom can be evaluated. If the RMS value exceeds the preset threshold, it indicates that the loom has excessive vibration and needs to be inspected and maintained to ensure that the air-jet loom is in a stable operating state.

[0068] S2, remove the active end excitation source, hammer the passive end position of the left and right wall panels, perform system frequency response function test, filter the vibration data of the response point, and obtain the system frequency response function.

[0069] Wherein, step S2 includes the following sub-steps:

[0070] S21, dividing the moving components of the air jet loom into a shedding mechanism, a beating-up mechanism, and a warp let-off mechanism, and setting corresponding attenuation coefficients according to their respective positions corresponding to the air jet loom frame;

[0071] S22, by regulating the loom system to control the movement of individual mechanisms, install acceleration sensors at the measurement points of each mechanism, hammer the passive end positions of the left and right wall panels, collect vibration response data of the air jet loom under various working conditions, and use a low-pass filter to filter the vibration response data to establish the corresponding system frequency response function.

[0072] In the filter design of this embodiment, the frequency response describes the degree to which the system amplifies or attenuates different frequency components. A low-pass filter attenuates high-frequency components while keeping low-frequency components unchanged. Its frequency response is expressed as:

[0073]

[0074] Where, j is the imaginary unit, oh c is the cutoff frequency, oh is the angular frequency;

[0075] The air-jet loom has large vibrations and its main moving components are divided into three parts, including the opening mechanism, the beating-up mechanism and the warp let-off mechanism. Acceleration sensors are installed at the key measuring points of each mechanism to collect the vibration response signals of the loom under various working conditions. As the vibration source moves away, its vibration frequency, noise, amplitude, etc. will continue to decay, so as to more accurately evaluate the frequency response characteristics of the system.

[0076] In this embodiment, the coefficient is set a is the attenuation coefficient of the opening mechanism from the frame, b is the attenuation coefficient of the beating-up mechanism from the frame, c is the attenuation coefficient of the warp let-off mechanism from the frame, where: a The value range is 0.32≤ a ≤0.57, b The value range is 0.42≤ b ≤0.68, c The value range is 0.54≤ c ≤0.79.

[0077] The system frequency response function expression is established according to the position of each corresponding rack:

[0078]

[0079] Where, f ( t ) is the air jet loom t The system frequency response function corresponding to the time is, a is the attenuation coefficient of the opening mechanism, U ( t ) is the frequency response data matrix of the opening mechanism, b is the attenuation coefficient of the beating-up mechanism, L ( t ) is the frequency response data matrix of the beating-up mechanism, c is the attenuation coefficient of the let-off mechanism, P ( t ) is the frequency response data matrix of the let-off mechanism;

[0080] in,

[0081]

[0082] in:

[0083] ;

[0084] ;

[0085] ;

[0086] Where, U ( t ) contains the frequency response functions of each observation point in the opening mechanism under different excitation source inputs, L ( t ) contains the frequency response functions of each observation point in the beating mechanism under different excitation source inputs, P ( t ) contains the frequency response functions of each observation point in the let-off mechanism under different excitation source inputs, u ij (t) is t Moment j When the excitation source is input, the corresponding i The frequency response function output by each observation point is l ij (t) is the first j When the excitation source is input, the corresponding i The frequency response function output by each observation point is p ij (t) is the first j When the excitation source is input, the corresponding i The frequency response function output by each observation point is t For time, jt ui For the first j The frequency response value of the output, jt li It is the first j The frequency response value of the output, jt pi For the opening mechanism j The frequency response value of the output, t c is the cutoff frequency, t c is the cutoff frequency, where the cutoff frequency is the frequency when the amplitude of the output signal drops to -3dB (i.e., approximately 0.707 times) the amplitude of the input signal.

[0087] In this embodiment, by setting the attenuation coefficient and individually controlling the movement of the mechanism, the influence of each component on the system vibration can be more accurately evaluated. The vibration response of each motion mechanism is measured, and the relevant frequency response function can be calculated for overall vibration signal filtering to filter out the vibration influence of the motion system and obtain a more accurate vibration signal of the excitation source, effectively reducing the vibration interference of the moving component, improving the authenticity of the transmission path signal, and providing data support for subsequent working condition load calculations.

[0088] S3, using the main motor, cam box, small pulley and large pulley as excitation sources, the suspension element as the connecting piece, and the passive end of the wall panel as the target response point, defines the vibration transmission path from the excitation source through the connecting piece to the target response point, and establishes a vibration transmission path analysis model for the air jet loom;

[0089] The suspension element in this embodiment includes a connecting part of the loom and a vibration source support, the connecting part is a rigid connecting part, each connecting part includes a vibration source installation side installation point and a wall panel side installation point, the vibration source support includes a cam box support and a motor support, each vibration source support includes a vibration source installation side installation point and a wall panel side installation point, wherein the vibration source installation side installation point is the active end and the wall panel side installation point is the passive end.

[0090] S4, introduces yarn tension and air damping correction parameters to correct the dynamic stiffness model of the suspension element, and calculates the structural vibration load force transmitted by the suspension element to the passive end based on the corrected dynamic stiffness model.

[0091] Among them, considering that when the air-jet loom is working, the high-speed airflow ejected from the nozzle will generate thrust on the yarn, causing it to move along a predetermined path. The warp yarn maintains a certain tension during the weaving process, which will generate a certain pulling force on the weft yarn. When the weft yarn passes through the warp yarn, friction will be generated between the yarns. This friction can be regarded as a kind of damping. When the yarn moves in the airflow, the resistance generated by the air to it is also a form of damping. Therefore, the correction parameter λ1 is introduced. At the same time, in addition to the damping, in order to eliminate the influence of the yarn, the static stiffness correction parameter λ2 under the influence of the yarn is introduced.

[0092] The yarn tension and air damping correction parameters are introduced to modify the dynamic stiffness model of the suspension element. The expression is:

[0093]

[0094] Where, m ix For the i The weft yarn on the path x The kinetic mass in the direction, m iy For the i The warp yarns on the path y The kinetic mass in the direction,c iax For the i On the path x Directional air damping coefficient, c iay For the i On the path y Directional air damping coefficient, k i For the i The static stiffness of the yarn suspended on the path, λ1 is the correction parameter for the air damping generated when the yarn moves in the airflow, and λ2 is the correction parameter for the static stiffness under the influence of the yarn. oh is the frequency.

[0095] After introducing the yarn tension and air damping correction parameters in this embodiment, the model can more comprehensively consider various physical effects in the working process of the air jet loom, such as yarn tension, friction damping and air resistance, so that the model can more accurately describe the dynamic behavior of the yarn, thereby improving the accuracy of the model.

[0096] In this embodiment, based on the modified dynamic stiffness model, the calculation of the structural vibration load force transmitted by the suspension element to the passive end includes the following steps:

[0097] According to the modified dynamic stiffness model, the structural vibration load force transmitted from the suspension element to the passive end is calculated as follows:

[0098]

[0099] Where, F i ( oh ) is the frequency ω applied to the i The structural vibration load force on each degree of freedom is a ai ( oh ) is the active end at frequency oh The acceleration under a pi ( oh ) is the passive end at frequency oh The acceleration under K i ( oh ) is the dynamic stiffness of the suspension element;

[0100] The vibration load of the air jet loom structure is calculated using the suspension dynamic stiffness method, and the dynamic response of multiple degrees of freedom is obtained, which is expressed as:

[0101]

[0102] Where, u q ( oh ) is the frequency oh Next system q degrees of freedom response, H qi ( oh ) is the frequency response function, which means i When a unit force is applied to each degree of freedom, q degrees of freedom response, F i ( oh ) is the frequency ω applied to the i The structural vibration load force on each degree of freedom is n is the total number of degrees of freedom in the system;

[0103] Substituting the calculation expression of the structural vibration load force transmitted by the suspension element to the passive end and the modified dynamic stiffness model into the calculation expression of the dynamic response of different degrees of freedom, the dynamic response of the system is obtained as follows:

[0104]

[0105] Where, G qi ( oh ) is the dynamic response of the system after the formula changes, expressed as oh The response of the system to the input force;

[0106] The dynamic response of the system is converted into the system linear matrix equation, which is expressed as:

[0107] ;

[0108] The linear matrix equation of the system is solved using the least squares method to obtain the dynamic mass of each suspension component. m i , damping coefficient c i Static stiffness k i The values ​​are substituted into the structural vibration load force expression transmitted by the suspension element to the passive end and the dynamic stiffness model of the modified suspension element, respectively, and the structural vibration load force transmitted by the suspension element to the passive end is calculated.

[0109] Among them, the data collected under the operating conditions of the reference point or target point are used for order tracking analysis, and the response signal of the reference point or target point includes oh order slices, each slice contains r indivual rpm Speed ​​sampling point, the system matrix equation is expressed in block form as follows:

[0110]

[0111] in,

[0112] ;

[0113] ;

[0114] ;

[0115] Where, , o m is the number of order slices, rpm x is the spindle speed of the motor box.

[0116] Considering all reference points u q (q=1, 2, 3, 4....., v ), then the block-wise expression of the system matrix equation is expanded into the overall equation of the system, which is expressed as:

[0117]

[0118] Where, , .

[0119] The system linear matrix equation is solved by the least squares method and the results are as follows:

[0120]

[0121] In the formula, [ X ]The solution result is the dynamic stiffness, damping and static stiffness of each suspension component, and + is the generalized inverse operator of the matrix.

[0122] S5: Multiply the structural vibration load force at the passive end by the frequency response function of the corresponding path to calculate the contribution of each path. Compare the contributions of each path and take the path with the largest contribution as the vibration-sensitive path.

[0123] The expression in step S5 is:

[0124]

[0125] Where, y k ( oh ) represents the transfer path contribution, H ki ( oh ) is from i Input point to k The frequency response function of the target point is expressed ini When a unit force is applied to the input point, k Target points at frequencies oh The following response.

[0126] In this embodiment, a filtering module is added to filter out the influence of vibrating components; acceleration signals of the target reference point, the input connection of the vibration source path, and vibration sources such as motors and cam boxes are collected under working conditions; the passive end positions of the left and right wall panels are hammered while the active end excitation sources such as motors are removed to perform a system frequency response function test; correction parameters are inserted to correct the influence of yarn tension and establish a vibration transfer path analysis model for the air-jet loom; the identification model is used to calculate the operating load; the path contribution of each target point is obtained by multiplying the passive end load by the corresponding path frequency response function; the vibration sensitive path is determined by comparing the contribution of each path. This method extends the traditional TPA method, introduces filtering processing and inserts correction parameters, improves the precision and accuracy of the vibration transfer path analysis, establishes a vibration analysis model of the excitation source-transfer path-target corresponding point, and visualizes the results of the path contribution, laying the foundation for vibration reduction optimization of the loom.

[0127] In a second aspect, the present invention further provides a system for analyzing the vibration transfer path of an air jet loom frame, which is implemented using the above-mentioned method for analyzing the vibration transfer path of an air jet loom frame, and the system comprises:

[0128] An acquisition module is used to obtain acceleration signals of the target reference point, the vibration source path input connection, and the vibration source under working conditions;

[0129] The simulation test module is used to remove the active end excitation source, hammer the passive end positions of the left and right wall panels, perform system frequency response function testing, and filter the vibration data of the response point to obtain the system frequency response function;

[0130] The modeling module is used to define the vibration transmission path from the excitation source through the connector to the target response point, using the main motor and cam box as the excitation source, the suspension element as the connector, and the passive end of the wall panel as the target response point, thereby establishing a vibration transmission path analysis model for the air jet loom.

[0131] a calculation module for introducing yarn tension and air damping correction parameters to correct the dynamic stiffness model of the suspension element, and calculating the structural vibration load force transmitted from the suspension element to the passive end based on the corrected dynamic stiffness model;

[0132] The determination module is used to multiply the structural vibration load force at the passive end by the frequency response function of the corresponding path, calculate the contribution of each path, compare the contribution of each path, and select the path with the largest contribution as the vibration sensitive path.

[0133] It should be noted that this system is a system corresponding to the above-mentioned air-jet loom frame vibration transmission path analysis method. All implementation methods in the above-mentioned method embodiments are applicable to the embodiments of this system and can achieve the same technical effects.

[0134] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0135] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems and modules can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0136] In the embodiments provided by the present invention, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interface, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0137] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0138] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0139] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, ROM, RAM, a magnetic disk, or an optical disk.

[0140] In addition, it should be pointed out that in the system and method of the present invention, it is obvious that each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present invention. Moreover, the steps of performing the above-mentioned series of processing can naturally be performed in chronological order according to the order of description, but they do not necessarily need to be performed in chronological order, and some steps can be performed in parallel or independently of each other. For those of ordinary skill in the art, it can be understood that all or any steps or components of the method and apparatus of the present invention can be implemented in hardware, firmware, software or a combination thereof in any computing device (including a processor, storage medium, etc.) or a network of computing devices. This can be achieved by those of ordinary skill in the art using their basic programming skills after reading the description of the present invention.

[0141] Therefore, the purpose of the present invention can also be achieved by running a program or a group of programs on any computing system. The computing system can be a well-known general-purpose system. Therefore, the purpose of the present invention can also be achieved simply by providing a program product containing program code that implements the method or device. That is to say, such a program product also constitutes the present invention, and the storage medium storing such a program product also constitutes the present invention. Obviously, the storage medium can be any well-known storage medium or any storage medium developed in the future. It should also be pointed out that in the device and method of the present invention, it is obvious that each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present invention. In addition, the steps of performing the above-mentioned series of processing can naturally be performed in chronological order according to the order of description, but do not necessarily need to be performed in chronological order. Certain steps can be performed in parallel or independently of each other.

[0142] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for analyzing vibration transmission path of an air jet loom frame, characterized in that: The following steps are involved: S1, obtain the acceleration signals of the target reference point, the vibration source path input connection point and the vibration source under the working condition; S2, remove the active end excitation source, hammer the passive end position of the left and right wall panels, perform system frequency response function test, filter the vibration data of the response point, and obtain the system frequency response function; Step S2 includes the following sub-steps: S21, dividing the moving components of the air jet loom into a shedding mechanism, a beating-up mechanism, and a warp let-off mechanism, and setting corresponding attenuation coefficients according to their respective positions corresponding to the air jet loom frame; S22, by regulating the loom system to control the movement of individual mechanisms, installing acceleration sensors at the measurement points of each mechanism, hammering the passive end positions of the left and right wall panels, collecting vibration response data of the air jet loom under various operating conditions, and filtering the vibration response data using a low-pass filter to establish the corresponding system frequency response function; The frequency response function expression of the system is: ； Where, f ( t ) is the air jet loom t The system frequency response function corresponding to the time is, a is the attenuation coefficient of the opening mechanism from the frame, U ( t ) is the frequency response data matrix of the opening mechanism, b is the attenuation coefficient of the beating-up mechanism from the frame, L ( t ) is the frequency response data matrix of the beating-up mechanism, c is the attenuation coefficient of the warp let-off mechanism from the frame, P ( t ) is the frequency response data matrix of the let-off mechanism; in, ； in: ； ； ； Where, U ( t ) contains the frequency response functions of each observation point in the opening mechanism under different excitation source inputs, L ( t ) contains the frequency response functions of each observation point in the beating mechanism under different excitation source inputs, P ( t ) contains the frequency response functions of each observation point in the let-off mechanism under different excitation source inputs, u ij (t) is the first j When the excitation source is input, the corresponding i The frequency response function output by each observation point is l ij (t) is the first j When the excitation source is input, the corresponding i The frequency response function output by each observation point is p ij (t) is the first j When the excitation source is input, the corresponding i The frequency response function output by each observation point is t For time, jt ui For the first j The frequency response value of the output, jt li It is the first j The frequency response value of the output, jt pi For the opening mechanism j The frequency response value of the output, t c is the cutoff frequency; S3, using the main motor, cam box, small pulley and large pulley as excitation sources, the suspension element as the connecting piece, and the passive end of the wall panel as the target response point, defines the vibration transmission path from the excitation source through the connecting piece to the target response point, and establishes a vibration transmission path analysis model for the air jet loom; S4, introducing yarn tension and air damping correction parameters to modify the dynamic stiffness model of the suspension element, and based on the modified dynamic stiffness model, calculating the structural vibration load force transmitted from the suspension element to the passive end; S5: Multiply the structural vibration load force at the passive end by the frequency response function of the corresponding path to calculate the contribution of each path. Compare the contributions of each path and take the path with the largest contribution as the vibration-sensitive path.

2. The method for analyzing vibration transmission path of an air jet loom frame according to claim 1, wherein: In step S1, the acceleration signals of the target reference point, the vibration source path input connection, and the vibration source under the working condition are obtained. Acceleration sensors are arranged at the motor, cam box, beating-up mechanism, shedding mechanism, warp let-off mechanism, and main shaft vibration source, as well as the passive ends of the left and right wall panels and the loom response points. When the air jet loom is in operation, vibration signals at different speeds are collected to obtain the vibration amplitude and frequency in the X, Y, and Z directions, and the root mean square value of the vibration acceleration is calculated to evaluate the vibration state of the loom.

3. The method for analyzing vibration transmission path of an air jet loom frame according to claim 1, wherein: The suspension element includes a connecting part of the loom and a vibration source support, the connecting part is a rigid connecting part, each connecting part includes a vibration source installation side installation point and a wall panel side installation point, the vibration source support includes a cam box support and a motor support, each vibration source support includes a vibration source installation side installation point and a wall panel side installation point, wherein the vibration source installation side installation point is the active end and the wall panel side installation point is the passive end.

4. The method for analyzing vibration transmission path of an air jet loom frame according to claim 1, wherein: In step S4, the yarn tension and air damping correction parameters are introduced to correct the dynamic stiffness model of the suspension element, and the expression is: ； Where, m ix For the i The weft yarn on the path x The kinetic mass in the direction, m iy For the i The warp yarns on the path y The kinetic mass in the direction, c iax For the i On the path x Directional air damping coefficient, c iay For the i On the path y Directional air damping coefficient, k i For the i The static stiffness of the yarn suspended on the path, λ1 is the correction parameter for the air damping generated when the yarn moves in the airflow, and λ2 is the correction parameter for the static stiffness under the influence of the yarn. ω is the frequency.

5. The method for analyzing vibration transmission path of an air jet loom frame according to claim 4, wherein: Calculating the structural vibration load force transmitted from the suspension element to the passive end based on the modified dynamic stiffness model in step S4 includes the following steps: According to the modified dynamic stiffness model, the structural vibration load force transmitted from the suspension element to the passive end is calculated as follows: ； Where, F i ( ω ) is the frequency ω applied to the i The structural vibration load force on each degree of freedom is a ai ( ω ) is the active end at frequency ω The acceleration under a pi ( ω ) is the passive end at frequency ω The acceleration under K i ( ω ) is the dynamic stiffness of the suspension element; The vibration load of the air jet loom structure is calculated using the suspension dynamic stiffness method, and the dynamic response of multiple degrees of freedom is obtained, which is expressed as: ； Where, u q ( ω ) is the frequency ω Next system q degrees of freedom response, H qi ( ω ) is the frequency response function, which means i When a unit force is applied to each degree of freedom, q degrees of freedom response, F i ( ω ) is the frequency ω applied to the i The structural vibration load force on each degree of freedom is n is the total number of degrees of freedom in the system; Substituting the calculation expression of the structural vibration load force transmitted by the suspension element to the passive end and the modified dynamic stiffness model into the calculation expression of the dynamic response of different degrees of freedom, the dynamic response of the system is obtained as follows: ； Where, G qi ( ω ) is the dynamic response of the system after the formula changes, expressed as ω The response of the system to the input force; The dynamic response of the system is converted into the system linear matrix equation, which is expressed as: ； The linear matrix equation of the system is solved using the least squares method to obtain the dynamic mass of each suspension component. m i , damping coefficient c i Static stiffness k i The values ​​are substituted into the structural vibration load force expression transmitted by the suspension element to the passive end and the dynamic stiffness model of the modified suspension element, respectively, and the structural vibration load force transmitted by the suspension element to the passive end is calculated.

6. The method for analyzing vibration transmission path of an air jet loom frame according to claim 5, wherein: In step S5, the structural vibration load force at the passive end is multiplied by the frequency response function of the corresponding path to calculate the contribution of each path, where the expression is: ； Where, y k ( ω ) represents the transfer path contribution, H ki ( ω ) is from i Input point to k The frequency response function of the target point is expressed in i When a unit force is applied to the input point, k Target points at frequencies ω The following response.

7. A system for analyzing vibration transfer paths of an air jet loom frame, implemented by the method for analyzing vibration transfer paths of an air jet loom frame according to any one of claims 1 to 6, characterized in that: The system comprises: An acquisition module is used to obtain acceleration signals of the target reference point, the vibration source path input connection, and the vibration source under working conditions; The simulation test module is used to remove the active end excitation source, hammer the passive end positions of the left and right wall panels, perform system frequency response function testing, and filter the vibration data of the response point to obtain the system frequency response function; The modeling module is used to define the vibration transmission path from the excitation source through the connector to the target response point, using the main motor and cam box as the excitation source, the suspension element as the connector, and the passive end of the wall panel as the target response point, thereby establishing a vibration transmission path analysis model for the air jet loom. a calculation module for introducing yarn tension and air damping correction parameters to correct the dynamic stiffness model of the suspension element, and calculating the structural vibration load force transmitted from the suspension element to the passive end based on the corrected dynamic stiffness model; The determination module is used to multiply the structural vibration load force at the passive end by the frequency response function of the corresponding path, calculate the contribution of each path, compare the contribution of each path, and select the path with the largest contribution as the vibration sensitive path.

8. A computer-readable storage medium, characterized in that The storage medium stores a program for analyzing a vibration transmission path of a jet loom frame. When the program is executed, the method for analyzing a vibration transmission path of a jet loom frame is implemented as claimed in any one of claims 1 to 6.

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