Dynamic response analysis method of bulk packaging based on virtual vibration table

Abstract

The present invention discloses a method for analyzing dynamic response of bulk packages based on a virtual vibration table, comprising the following steps: S1, establishing a transport vehicle model, and then assembling vehicle parameters and debugging them according to the structural parameters and dynamic characteristics of the actual transport vehicle; S2, establishing a three-dimensional road model; S3, obtaining the structural parameters of the bulk packages through experiments; S4, constructing a virtual test bench for the bulk packages according to the data obtained in steps S1-S3; S5, applying vibration excitation to the bulk packages through the virtual test bench to simulate motion and obtain excitation data; S6, obtaining the dynamic indicators of the bulk packages according to the virtual test bench in step S5, and analyzing the response of the bulk packages during motion. The present invention has the advantages of accuracy and real-time, and can provide accurate data for manufacturers of bulk material packages and logistics companies to determine the maximum value of transporting bulk packages within a specified range, thereby saving transportation costs.

Description

Technical Field

[0001] The present invention relates to the technical field of logistics detection, and in particular to a dynamic response analysis method of bulk packaging based on a virtual vibration table. Background Art

[0002] With the rapid development of the transportation industry and modern logistics industry in recent years, the domestic transportation packaging industry has gained a good development space. In fact, the domestic packaging industry has made great progress and breakthroughs since its inception, but the large amount of goods falling, damage and even destruction caused during transportation directly threatens the safety and reliability of the goods during transportation, and brings huge losses and unnecessary troubles to enterprises and customers. In order to solve the common problems of goods during transportation, domestic and foreign academic circles have taken the study of the mechanical properties of transportation packaging in the stacking state as an important topic of modern packaging engineering. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention proposes a dynamic response analysis method for bulk packages based on a virtual vibration table, which analyzes the dynamic response of bulk packages in an efficient manner.

[0004] In order to solve the above technical problems, the technical solution of the present invention is:

[0005] A method for dynamic response analysis of bulk packaging based on a virtual vibration table comprises the following steps:

[0006] S1. Establish a transport vehicle model, and then set up vehicle parameters and debug according to the structural parameters and dynamic characteristics of the actual transport vehicle;

[0007] S2, establishing a three-dimensional road model;

[0008] S3. Obtaining structural parameters of bulk packaging parts through experiments;

[0009] S4, constructing a virtual test bench for bulk packaging according to the data obtained in steps S1 to S3;

[0010] S5, applying vibration excitation to the bulk package through the virtual test bench to perform simulated motion and obtain excitation data;

[0011] S6. According to the virtual test bench described in step S5, the dynamic index of the bulk package is obtained, and the response of the bulk package during the movement is analyzed.

[0012] Preferably, in step S1, a transport vehicle model is drawn by 3D drawing software and called into adams / car software, wherein the structural parameters of the transport vehicle include vehicle mass, component mass and body length, and the dynamic characteristics of the transport vehicle include dynamic performance parameters of the vehicle engine and suspension.

[0013] Preferably, the method for establishing the three-dimensional road model is to establish the three-dimensional road model by calling RoadBuider in adams / car, and the road parameters include the length, longitudinal slope, gradient and road friction coefficient of straight lines and transition curves.

[0014] Preferably, in step S3, the structural parameters of the bulk packages include the mass, shape and volume of the entire bulk packages, the stiffness and damping of the bulk packages, the friction coefficient of the surface of the bulk packages and the stacking form.

[0015] Preferably, in step S3, the stress-strain curve and the strain-time image of the bulk package are obtained through experiments, and the stiffness and damping parameters of the bulk package are calculated by processing the stress-strain curve through the Kelven formula, and the calculation formula is as follows:

[0016] Where k = E, η = c

[0017] Where ε represents the strain parameter, σ represents the stress parameter, k represents the stiffness parameter, c represents the damping parameter, and t represents time.

[0018] Preferably, the method for constructing the virtual test bench in step S4 is:

[0019] S4-1. Using the bulk package structural parameters obtained in step S3, use Adams / View to build a bulk package model with a preset shape, volume and mass, and arrange the bulk packages neatly in a stacking form, wherein the center of mass of the bulk packages must be located on the same straight line;

[0020] S4-2. Establish a rectangular block with a certain mass under the bottom layer of packages, i.e., a virtual test bench for bulk packages.

[0021] Preferably, step S5 includes the following sub-steps:

[0022] S5-1. Add spring connectors between every two adjacent bulk packages and between the bottom layer of bulk packages and the virtual test bench, and assign corresponding equivalent stiffness, equivalent stiffness and friction coefficient;

[0023] S5-2, according to the motion characteristics of the bulk packages, determine the motion relationship between the bulk packages, the motion relationship between the bulk packages and the vibration table, and the motion relationship between the vibration table and the ground, and apply kinematic pairs to them, the first two being moving pairs and the latter being a fixed pair;

[0024] S5-3. Use Adams / View to add virtual sensors at relevant locations of each bulk package to measure dynamic response indicators.

[0025] S5-4. Use Adams / View to test and debug the virtual test bench until it is confirmed to be correct.

[0026] Preferably, the debugging method of step S5-4 is:

[0027] S5-4-1, z-axis direction debugging, where the mathematical expression of the z-axis direction is:

[0028]

[0029] Where m k , k k 、c k Respectively represent the mass, equivalent stiffness coefficient, and equivalent damping coefficient of each layer of bulk packaging. m1 is the top layer, and the rest are similar. k is the displacement of the kth layer of bulk packaging, g represents the acceleration of gravity, z p+1 is the actual displacement of the truck bed, k0 = c0 = 0;

[0030] S5-4-2, y-axis direction debugging, where the mathematical expression of the y-axis direction is:

[0031]

[0032] Where m ij , k ij 、c ij Represent the mass, equivalent stiffness coefficient, and equivalent damping coefficient of each row of bulk packaging, m i1 The leftmost loose package, and the rest are similar. ij is the displacement of the jth row of bulk packages, g is the acceleration due to gravity, y n is the actual displacement of the nth row of bulk packages, k i0 =c i0 =0;

[0033] S5-4-3, x-axis direction debugging, where the mathematical expression for the x-axis direction is:

[0034]

[0035] Where m ij , k ij 、c ij Represent the mass, equivalent stiffness coefficient, and equivalent damping coefficient of each column of bulk packaging, m 1j The first bulk package, and the rest by analogy, x ij is the displacement of the bulk package in the i-th column, g represents the acceleration due to gravity, x m+1 is the actual displacement of the truck front fender, k 0j =c 0j =0.

[0036] Preferably, step S6 includes the following sub-steps:

[0037] S6-1, the transport vehicle model, the 3D road model and the bulk packaging parts are coupled in Adams;

[0038] S6-2, adding the acquired excitation data to Adams / View, and performing simulation motion, thereby obtaining the dynamic response of each layer of bulk packaging parts;

[0039] S6-3. Use Adams to perform time domain analysis and frequency domain analysis on the dynamic response indicators. The frequency domain analysis method is:

[0040]

[0041] Where n 00 is the lower cutoff spatial frequency, n0 is the participating spatial frequency, G q (n0) is the road roughness coefficient at the participating spatial frequency n0, w(t) is the time domain signal of white noise, q(t) is the excitation, and u is the speed.

[0042] The present invention has the following characteristics and beneficial effects:

[0043] The present invention comprehensively considers the interaction between vehicles, roads and goods during the transportation of bulk packages, and analyzes the dynamic response of bulk packages in an efficient manner, thereby having stronger adaptability and thus having high theoretical value and promotion prospects;

[0044] The present invention uses a virtual vibration platform created by ADAMS software to comprehensively consider the displacement of the soft package bag in three directions;

[0045] The present invention adopts a solid modeling method, takes into account the friction between the components, and more accurately monitors the motion state of the bulk packaging components.

[0046] The present invention can realize visualization of the analysis process, and the staff can observe the dynamic behavior of the bulk package during transportation in real time.

[0047] In summary, the present invention has the advantages of accuracy and real-time, and can provide accurate data for manufacturers of bulk material packages and logistics companies to determine the maximum value of transporting bulk packages within a specified range, thereby saving transportation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative labor.

[0049] Figure 1 is a flow chart of an embodiment of the present invention.

[0050] Figure 2 The utility model is a bucket truck model in the embodiment of the present invention.

[0051] Figure 3 It is a coupling model of a bucket truck and a road in an embodiment of the present invention.

[0052] Figure 4 It is a schematic diagram of a model of a bulk package of an xoy shaft in an embodiment of the present invention.

[0053] Figure 5 It is a schematic diagram of a model of a bulk package of an xoz shaft in an embodiment of the present invention.

[0054] Figure 6 Schematic diagram of a model of a three-layer bulk packaging piece in an embodiment of the present invention. DETAILED DESCRIPTION

[0055] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0058] The present invention provides a dynamic response analysis method for bulk packaging based on a virtual vibration table. Figure 1 As shown, the following steps are included:

[0059] S1. Establish a transport vehicle model, then set up vehicle parameters and debug according to the structural parameters and dynamic characteristics of the actual transport vehicle.

[0060] Among them, the transport vehicle model is drawn by 3D mapping software and called into the adams / car software. The structural parameters of the transport vehicle include the vehicle mass, component mass and body length. The dynamic characteristics of the transport vehicle include the power performance parameters of the automobile engine and suspension.

[0061] The 3D drawing software selected in this embodiment is UG software.

[0062] It is understandable that the transport vehicle model is a graphic model, and the drawing of the graphic model is a conventional technical means, so it is not specifically described in this embodiment. In addition, the structural parameters of the transport vehicle and the dynamic characteristics of the transport vehicle can be directly obtained, so it is not specifically described in this embodiment.

[0063] In addition, the mass of the entire vehicle should also include the mass of the bulk packages carried by the vehicle compartment. In this embodiment, the preferred transport vehicle model is an open bucket truck.

[0064] S2. Establish a three-dimensional road model.

[0065] The method for establishing the three-dimensional road model is to establish the three-dimensional road model by calling the Road Builder in adams / car, and the road parameters include the length, longitudinal slope, gradient and road friction coefficient of straight lines and transition curves.

[0066] It is understandable that the three-dimensional road model is a graphic model, and the drawing of the graphic model is a conventional technical means, so it is not specifically described in this embodiment. In addition, the road parameters can be directly obtained, so it is not specifically described in this embodiment.

[0067] S3. Obtain the structural parameters of bulk packaging through experiments.

[0068] The structural parameters of the bulk package include the mass, shape and volume of the entire bulk package, the stiffness and damping of the bulk package, the friction coefficient of the surface of the bulk package and the stacking form.

[0069] It can be understood that the above structural parameters can be obtained by conducting experiments on entities of bulk packaging.

[0070] Among them, the method of obtaining stiffness and damping parameters is:

[0071] Specifically, the stiffness and damping parameters are obtained by testing the stress-strain curve of the bulk package and the image of strain and time, and the stiffness and damping parameters of the bulk package are calculated by processing the stress-strain curve through the Kelven formula. The calculation formula is as follows:

[0072] Where k = E, η = c

[0073] Where ε represents the strain parameter, σ represents the stress parameter, k represents the stiffness parameter, c represents the damping parameter, and t represents time.

[0074] S4, constructing a virtual test bench for bulk packaging according to the data obtained in steps S1 to S3;

[0075] Specifically, Figure 4 As shown in the figure, the construction method of the virtual test bench is:

[0076] S4-1. Using the bulk package structural parameters obtained in step S3, use Adams / View to build a bulk package model with a preset shape, volume and mass, and arrange the bulk packages neatly in a stacking form, wherein the center of mass of the bulk packages must be located on the same straight line;

[0077] S4-2. Establish a rectangular block with a certain mass under the bottom layer of packages, i.e., a virtual test bench for bulk packages.

[0078] S5. Apply vibration excitation to the bulk package through the virtual test bench to perform simulated motion and obtain excitation data.

[0079] Specifically, Figure 5 and Figure 6 As shown, it includes the following sub-steps

[0080] S5-1. Add spring connectors between every two adjacent bulk packages and between the bottom layer of bulk packages and the virtual test bench, and assign corresponding equivalent stiffness, equivalent stiffness and friction coefficient;

[0081] S5-2, according to the motion characteristics of the bulk packages, determine the motion relationship between the bulk packages, the motion relationship between the bulk packages and the vibration table, and the motion relationship between the vibration table and the ground, and apply kinematic pairs to them, the first two being moving pairs and the latter being a fixed pair;

[0082] S5-3. Use Adams / View to add virtual sensors at relevant locations of each bulk package to measure dynamic response indicators.

[0083] S5-4. Use Adams / View to test and debug the virtual test bench until it is confirmed to be correct.

[0084] Furthermore, the debugging method of step S5-4 is:

[0085] S5-4-1, z-axis direction debugging, where the mathematical expression of the z-axis direction is:

[0086]

[0087] Where m k , k k 、c k Respectively represent the mass, equivalent stiffness coefficient, and equivalent damping coefficient of each layer of bulk packaging. m1 is the top layer, and the rest are similar. k is the displacement of the kth layer of bulk packaging, g represents the acceleration of gravity, z p+1 is the actual displacement of the truck bed, k0 = c0 = 0;

[0088] S5-4-2, y-axis direction debugging, where the mathematical expression of the y-axis direction is:

[0089]

[0090] Where mij , k ij 、c ij Represent the mass, equivalent stiffness coefficient, and equivalent damping coefficient of each row of bulk packaging, m i1 The leftmost loose package, and the rest are similar. ij is the displacement of the jth row of bulk packages, g is the acceleration due to gravity, y n is the actual displacement of the nth row of bulk packages, k i0 =c i0 =0;

[0091] S5-4-3, x-axis direction debugging, where the mathematical expression for the x-axis direction is:

[0092]

[0093] Where m ij , k ij 、c ij Represent the mass, equivalent stiffness coefficient, and equivalent damping coefficient of each column of bulk packaging, m 1j The first bulk package, and the rest by analogy, x ij is the displacement of the bulk package in the i-th column, g represents the acceleration due to gravity, x m+1 is the actual displacement of the truck front fender, k 0j =c 0j =0.

[0094] S6. According to the virtual test bench described in step S5, the dynamic index of the bulk package is obtained, and the response of the bulk package during the movement is analyzed.

[0095] Specifically, step S6 includes the following sub-steps:

[0096] S6-1, transport vehicle model, 3D road model and bulk packaging parts are coupled in Adams.

[0097] It can be understood that the transport vehicle model, the three-dimensional road model and the virtual test bench for bulk packaging are coupled to form a visual virtual test simulation platform, and the experimental effect is more intuitive.

[0098] S6-2, adding the acquired excitation data to Adams / View, and performing simulation motion, thereby obtaining the dynamic response of each layer of bulk packaging parts;

[0099] S6-3. Use Adams to perform time domain analysis and frequency domain analysis on the dynamic response indicators. The frequency domain analysis method is:

[0100]

[0101] Where n 00 is the lower cutoff spatial frequency, n0 is the participating spatial frequency, G q (n0) is the road roughness coefficient at the participating spatial frequency n0, w(t) is the time domain signal of white noise, q(t) is the excitation, and u is the speed.

[0102] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments including components are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A dynamic response analysis method for bulk packaging based on a virtual vibration table, characterized in that: The steps include: S1. Establish a transport vehicle model, and then set up vehicle parameters and debug according to the structural parameters and dynamic characteristics of the actual transport vehicle; S2, establishing a three-dimensional road model; S3. Obtaining structural parameters of bulk packaging parts through experiments; The structural parameters of the bulk package include the mass, shape and volume of the entire bulk package, the stiffness and damping of the bulk package, the friction coefficient of the surface of the bulk package and the stacking form; The stress-strain curve and the image of strain and time of the bulk package are obtained through the test, and the stiffness and damping parameters of the bulk package are calculated by processing the stress-strain curve through the Kelven formula. The calculation formula is as follows: Where k = E, η = c In the formula, ε represents the strain parameter, σ represents the stress parameter, k represents the stiffness parameter, c represents the damping parameter, and t represents the time; S4, constructing a virtual test bench for bulk packaging according to the data obtained in steps S1 to S3; S4-1. Using the bulk package structural parameters obtained in step S3, use Adams / View to build a bulk package model with a preset shape, volume and mass, and arrange the bulk packages neatly in a stacking form, wherein the center of mass of the bulk packages must be located on the same straight line; S4-2. Establish a rectangular block with a predetermined mass under the bottom layer of packages, i.e., a virtual test bench for bulk packages; S5, applying vibration excitation to the bulk package through the virtual test bench to perform simulated motion and obtain excitation data; S5-1. Add spring connectors between every two adjacent bulk packages and between the bottom layer of bulk packages and the virtual test bench, and assign corresponding equivalent stiffness, equivalent stiffness and friction coefficient; S5-2, according to the motion characteristics of the bulk packages, determine the motion relationship between the bulk packages, the motion relationship between the bulk packages and the vibration table, and the motion relationship between the vibration table and the ground, and apply kinematic pairs to them, the first two being moving pairs and the latter being a fixed pair; S5-3. Use Adams / View to add virtual sensors at relevant locations of each bulk package to measure dynamic response indicators. S5-4. Use Adams / View to test and debug the virtual test bench until it is confirmed to be correct; S6. According to the virtual test bench described in step S5, the dynamic index of the bulk package is obtained, and the response of the bulk package during the movement is analyzed. S6-1, the transport vehicle model, the 3D road model and the bulk packaging parts are coupled in Adams; S6-2, adding the obtained excitation data to Adams / View, and performing simulation motion, thereby obtaining the dynamic response of each layer of bulk packaging parts; S6-3. Use Adams to perform time domain analysis and frequency domain analysis on the dynamic response index. The frequency domain analysis method is: Where n 00 is the lower cutoff spatial frequency, n0 is the participating spatial frequency, G q (n0) is the road roughness coefficient at the participating spatial frequency n0, w(t) is the time domain signal of white noise, q(t) is the excitation, and u is the speed.

2. The dynamic response analysis method of bulk packaging based on a virtual vibration table according to claim 1 is characterized in that: In the step S1, a transport vehicle model is drawn by 3D drawing software and called into adams / car software. The structural parameters of the transport vehicle include the vehicle mass, component mass and body length. The dynamic characteristics of the transport vehicle include the dynamic performance parameters of the vehicle engine and suspension.

3. The dynamic response analysis method of bulk packaging based on a virtual vibration table according to claim 1 is characterized in that: The method for establishing the three-dimensional road model is to establish the three-dimensional road model by calling RoadBuider in adams / car, and the road parameters include the length, longitudinal slope, slope and road friction coefficient of straight lines and transition curves.

4. The method for dynamic response analysis of bulk packaging based on a virtual vibration table according to claim 1, characterized in that: The debugging method of step S5-4 is: S5-4-1, z-axis direction debugging, where the mathematical expression of the z-axis direction is: k=1…P Where m k , k k 、c k Respectively represent the mass, equivalent stiffness coefficient, and equivalent damping coefficient of each layer of bulk packaging. m1 is the top layer, and the rest are similar. k is the displacement of the kth layer of bulk packaging, g represents the acceleration of gravity, z p+1 is the actual displacement of the truck bed, k0 = c0 = 0; S5-4-2, y-axis direction debugging, where the mathematical expression of the y-axis direction is: j=1…n Where m ij , k ij 、c ij Represent the mass, equivalent stiffness coefficient, and equivalent damping coefficient of each row of bulk packaging, m i1 The leftmost loose package, and the rest are similar. ij is the displacement of the jth row of bulk packages, g is the acceleration due to gravity, y n is the actual displacement of the nth row of bulk packages, k i0 =c i0 =0; S5-4-3, x-axis direction debugging, where the mathematical expression for the x-axis direction is: i=1…m Where m ij , k ij 、c ij Respectively represent the mass, equivalent stiffness coefficient, and equivalent damping coefficient of each column of bulk packaging, m 1j The first bulk package, and the rest by analogy, x ij is the displacement of the bulk package in the i-th column, g represents the acceleration due to gravity, x m+1 is the actual displacement of the truck front fender, k 0j =c 0j =0.

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