Method and device for calculating a cold-charge-blower-pipeline envelope space in a passenger car

Abstract

The application is a kind of calculation method and device for envelope space of passenger car intercooler blow molding pipeline. It includes: 1. establishing network model of intercooler blow molding pipeline; 2. measuring actual stress and strain data of blow molding pipeline material; 3. fitting out blow molding pipe material constitutive equation parameters under different working temperatures, giving blow molding pipeline material constitutive equation parameters under corresponding working temperatures; 4. giving material constitutive equation parameters to blow molding pipeline; 5. determining one of external load input; 6. determining two of external load input; 7. solving the model, taking grid model of blow molding pipeline as deformation output point, and exporting three-dimensional space composed of deformation of blow molding pipeline surface node as envelope space of blow molding pipeline in vehicle movement process. The application combines actual working environment of intercooler blow molding pipeline, considers influence of internal pressure on pipeline deformation and displacement, and can more accurately calculate envelope space in vehicle driving process.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, specifically to a method and apparatus for calculating the envelope space of blow-molded pipes in an intercooler of a passenger vehicle. Background Technology

[0002] Traditional automotive intercooler outlet piping is mostly a composite system composed of metal and rubber hoses, which suffers from drawbacks such as high weight, high cost, and susceptibility to leaks. Using blow-molded piping instead of traditional composite piping effectively solves these problems, leading to its increasing application in passenger vehicles. However, the following issues are unavoidable when using blow-molded piping: as a crucial component connecting the powertrain and intercooler, the blow-molded piping is typically complex in shape due to space constraints imposed by the powertrain system and surrounding components. During vehicle movement, the powertrain system causes complex movements in the blow-molded piping, resulting in significant friction with surrounding components and a substantial impact on the material properties of the blow-molded piping. Furthermore, the internal working pressure causes considerable deformation. Due to these combined factors, the envelope space of the blow-molded piping during vehicle movement is difficult to measure accurately. Summary of the Invention

[0003] This invention provides a method and apparatus for calculating the envelope space of the blow-molded pipe of an intercooler in a passenger vehicle, which can more accurately measure the envelope space during vehicle operation and solves the above-mentioned problems in measuring the envelope space of the blow-molded pipe of the intercooler during vehicle operation.

[0004] The technical solution of this invention is described below in conjunction with the accompanying drawings:

[0005] In a first aspect, embodiments of the present invention provide a method for calculating the envelope space of blow-molded pipes in an intercooler of a passenger vehicle, comprising the following steps:

[0006] Step 1: Establish the network model of the intercooler blow molding piping;

[0007] Step 2: Obtain the actual stress and strain data of the blow-molded pipe material at a given operating temperature through tensile testing;

[0008] Step 3: Organize the actual stress and strain data obtained in Step 2, fit the constitutive equation parameters of the blow-molded pipe material at different working temperatures, and assign the material constitutive equation parameters of the blow-molded pipe at the corresponding working temperature according to the different working temperatures in the subsequent calculation process.

[0009] Step 4: Assign the material constitutive equation parameters obtained in Step 3 to the blow-molded pipe, and set the material properties, boundary conditions, and suspension point stiffness values ​​of other components in the model. Check the counterweight and center of mass position of the intercooler model to ensure consistency with the relevant parameters of the geometric model under working conditions.

[0010] Step 5: Determine one of the external load inputs, namely the magnitude of the load caused by the powertrain motion;

[0011] Step 6: Determine the second external load input, namely the load magnitude caused by the external working pressure;

[0012] Step 7: Set the model to nonlinear implicit static solution, use all the mesh models of the blow-molded pipe as deformation output points, and export the deformation of the surface nodes of the blow-molded pipe along the X, Y, and Z directions in the form of a cloud map. The resulting three-dimensional space is the envelope space of the blow-molded pipe during vehicle movement.

[0013] Furthermore, based on the 3D models of the intercooler, bracket, and blow-molded piping provided by the design department, the geometry was cleaned up using Hypermesn software, and the neutral layer surfaces of the corresponding components were extracted. Shell elements were used for mesh generation to establish a mesh model, and flexible elements were used to simulate the stiffness.

[0014] Furthermore, in step two, for small deformation simulation, the tensile test includes at least uniaxial tension, and for large deformation simulation, the tensile test is multiaxial tension; ensuring that the strain in the tensile test is greater than the maximum strain that the material may actually experience.

[0015] Furthermore, in step three, the specific steps for fitting the material constitutive equation using Abaqus software are as follows:

[0016] 31) Define the hyperelastic material in the Part module and import the relevant values ​​of the actual stress-strain curve of the material obtained from the experiment into the edit material module;

[0017] 32) After the data is read, click Evaluate and select multiple constitutive equations for fitting;

[0018] 33) After the fitting calculation is completed, select the constitutive equation with the best material stability and the best fitting effect, and write the corresponding parameters into the calculation file; if the selected material model shows a material instability warning, a new model should be selected for fitting.

[0019] Furthermore, the specific method for step five is as follows:

[0020] 51) Select the most severe operating condition Ψ among the 28 operating conditions of the powertrain. i (i = 1, 2, 3...), the engine centroid A(x) corresponding to the severe operating conditions. a y a , z a The spatial translational moments along the three axes are X i Y i Z i The rotation amounts are respectively θxi θ yi θ zi During vehicle movement, the blow-molded piping undergoes translational and rotational motion driven by the engine. The coordinates of the connection point between the blow-molded piping and the engine are B(x). b y b , z b );

[0021] 52) Establish a new coordinate system with the centroid A as the origin, and the x, y, and z directions are the same as those of the vehicle coordinate system; in the new coordinate system, the coordinates of the centroid are transformed into A1(0, 0, 0), and the coordinates of the connection point between the blow molding pipe and the engine are transformed into B1(x1, y1, z1), where x1 = x b -x a y1=y b -y a , z1=z b -z a ;

[0022] 53) Rotate point B1 about point A1, with the rotation angles about the three axes being θ. xi θ yi θ zi After rotation, we get C(x) c y c , z c )point;

[0023] 54) We obtain point C(x) c y c , z c After obtaining the coordinates, continue to translate the corresponding displacements (X, Y, Z) along the x, y, and z directions respectively. i Y i Z i The final position D(x) of the connection point B1 after its movement is obtained. d y d , z d The difference between the coordinates of point B1 and point B1 is the total translational displacement (Δxi, Δyi, Δzi) caused by the powertrain driving the blow molding pipeline, where:

[0024]

[0025] Furthermore, the coordinates of point C in step 53) can be determined in the following two ways:

[0026] (1) The first method is to obtain the specific coordinate values ​​of the corresponding points after coordinate transformation through mathematical formulas. The specific steps are as follows:

[0027] S11, rotate point B1(x1, y1, z1) by θ around the X-axis. xiGiven B2(x1, y2, z2), the relative positions of the two points in the coordinate system before and after rotation; where HB1 = HB2, then:

[0028]

[0029]

[0030] After combining the two equations and performing the calculations, we get:

[0031]

[0032] Then, the coordinates of point B2 after rotation are (x1, y1cosθ) xi -z1sinθ xi ,z1cosθ xi +y1sinθ xi );

[0033] S12, repeat S11), to obtain successive rotations θ around the Y-axis. yi and rotation θ around the Z-axis zi The coordinates B3(x3, y2, z3) and B4(x4, y4, z3) are obtained after three rotations. Point B4 is point C obtained after three rotations.

[0034] (2) The second method involves using Hypermesh software to determine the coordinates of point C after rotation. The specific steps are as follows:

[0035] S21) In the Geom panel of the HyperMesh software, select Nodes and enter the coordinates of A1(0, 0, 0) and B1(x1, y1, z1) respectively. Click Create and the newly created points A1 and B1 will appear in space.

[0036] S22) In the tool panel, select rotate, select the newly created point B1, set the rotation direction to around the X-axis, select the newly created point A1 as the rotation base point, and set the corresponding angle to θ. xi Click rotate+;

[0037] S23) Select the rotated point B1, and rotate it around the Y-axis and Z-axis by the corresponding angles θ. yi and θ zi ;

[0038] S24) After three rotations, point B1 reaches a new position. Click the Card edit button, select the rotated point B1, and click edit. The coordinates displayed on the panel are C(x) c y c , z c )coordinate.

[0039] Furthermore, the specific method for step six is ​​as follows:

[0040] Set all the meshes on the surface of the intercooler chamber and the inner cavity of the blow-molded pipe as a set of elements, which serves as the excitation point for the gas pressure in the cavity under working conditions. At this time, it should be ensured that the normals of all shell elements are consistent, and the corresponding loads can be added according to the internal pressure. Combined with the extreme displacements (Δxi, Δyi, Δzi) of the connection point between the blow-molded pipe and the engine obtained in step five and the internal gas pressure, the two together constitute the main external load borne by the intercooler blow-molded pipe during vehicle movement.

[0041] Secondly, embodiments of the present invention provide a calculation device for the envelope space of blow-molded pipes in an intercooler of a passenger vehicle, the device comprising:

[0042] A model building module is used to build a network model of the intercooler blow molding piping.

[0043] The stress-strain data acquisition module is used to obtain the actual stress-strain data of blow-molded pipe materials at a given operating temperature through tensile testing.

[0044] The fitting module is used to organize the obtained actual stress and strain data, fit the constitutive equation parameters of the blow-molded pipe material at different working temperatures, and assign the material constitutive equation parameters of the blow-molded pipe at the corresponding working temperature according to the different working temperatures in the subsequent calculation process.

[0045] The verification module is used to assign the obtained material constitutive equation parameters to the blow molding pipeline, and to set the material properties, boundary conditions, and suspension point stiffness values ​​of other components in the model. It also verifies the counterweight and center of mass position of the intercooler model to ensure consistency with the relevant parameters of the geometric model under working conditions.

[0046] The first determining module is used to determine one of the external load inputs, namely the magnitude of the load caused by the powertrain motion;

[0047] The second determining module is used to determine the second external load input, namely the load magnitude caused by the external working pressure.

[0048] The calculation module is used to set the model as a nonlinear implicit static solution, and uses all the mesh models of the blow-molded pipe as deformation output points. It derives the deformation of the surface nodes of the blow-molded pipe along the X, Y, and Z directions in the form of a cloud map. The resulting three-dimensional space is the envelope space of the blow-molded pipe during vehicle movement.

[0049] Thirdly, embodiments of the present invention also provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements a method for calculating the envelope space of a blow-molded pipe in a passenger vehicle intercooler as described in any of the embodiments of the present invention.

[0050] Fourthly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for calculating the envelope space of a blow-molded pipe in a passenger vehicle intercooler as described in any of the embodiments of the present invention.

[0051] The beneficial effects of this invention are as follows:

[0052] 1) This invention considers the influence of boundary conditions on the accuracy of calculation results, quantifies the influence of complex powertrain motion on the envelope space of blow molding pipeline, and uses it as an important input load;

[0053] 2) This invention takes into account the characteristics of blow molding materials;

[0054] 3) This invention uses the constitutive equation of hyperelastic material to fit the actual stress-strain curve, rather than relying solely on traditional empirical formulas, and also considers the influence of temperature on material properties.

[0055] 4) This invention takes into account the actual working environment of the intercooler blow molding pipeline and the influence of internal pressure on pipeline deformation and displacement, which can more accurately calculate its envelope space during vehicle operation. Attached Figure Description

[0056] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 This is a flowchart illustrating a method for calculating the envelope space of blow-molded pipes in a passenger vehicle intercooler according to Embodiment 1 of the present invention.

[0058] Figure 2 This is a schematic diagram of coordinate transformation in Embodiment 1 of the present invention;

[0059] Figure 3 This is a schematic diagram of the intercooler piping system.

[0060] Figure 4 This is a schematic diagram of a curve fitting result according to an embodiment of the present invention;

[0061] Figure 5 This is a schematic diagram showing the connection relationship between the powertrain and the intercooler piping system in Embodiment 1 of the present invention;

[0062] Figure 6 This is a schematic diagram of the structure of a calculation device for the envelope space of the blow-molded pipe of an intercooler in a passenger vehicle, according to Embodiment 2 of the present invention.

[0063] Figure 7 This is a schematic diagram of the structure of an electronic device according to Embodiment 3 of the present invention.

[0064] In the picture:

[0065] 1. The first connection point between the intercooler piping and the powertrain;

[0066] 2. Blow-molded intercooler pipe;

[0067] 3. Intercooler chamber;

[0068] 4. First suspension point;

[0069] 5. Second suspension point;

[0070] 6. Third suspension point. Detailed Implementation

[0071] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0072] Example 1

[0073] See Figure 1 and Figure 3 , Figure 1 This is a flowchart of a method for calculating the envelope space of blow-molded pipes in a passenger vehicle intercooler, provided in Embodiment 1 of the present invention. This embodiment is applicable to the calculation method of the envelope space of blow-molded pipes in a passenger vehicle intercooler. This method can be executed by a calculation device for the envelope space of blow-molded pipes in a passenger vehicle intercooler, as provided in this embodiment of the present invention. This device can be implemented in software and / or hardware.

[0074] Includes the following steps:

[0075] Step 1: Establish the network model of the intercooler blow molding piping;

[0076] Based on the 3D models of the intercooler, bracket, and blow-molded piping provided by the design department, the geometry was cleaned using Hypermesn software, and the neutral layer surfaces of the corresponding components were extracted. Shell elements were used for mesh generation to establish the mesh model. The influence of the intercooler mounting structure on the results was considered, and flexible elements were used to simulate the stiffness.

[0077] Step 2: Due to the special properties of blow-molded pipe materials, the actual stress and strain data of the blow-molded pipe materials at a given operating temperature are measured through tensile tests. For small deformation simulations, the tensile test should include at least uniaxial tension, and for large deformation simulations, the tensile test should be multiaxial tension. It is necessary to ensure that the strain in the tensile test is greater than the maximum strain that the material may actually experience.

[0078] Step 3: Organize the actual stress and strain data obtained in Step 2, use CAE simulation method to fit the constitutive equation parameters of the blow-molded pipe material at different working temperatures, and assign the material constitutive equation parameters of the blow-molded pipe at the corresponding working temperature according to the different working temperatures in the subsequent calculation process.

[0079] The specific steps for fitting the constitutive equation of a material using Abaqus software are as follows:

[0080] 31) Define the hyperelastic material in the Part module and import the relevant values ​​of the actual stress-strain curve of the material obtained from the experiment into the edit material module;

[0081] 32) After the data is read, click Evaluate and select multiple constitutive equations for fitting;

[0082] 33) After the fitting calculation is completed, select the constitutive equation with the best material stability and the best fitting effect, and write the corresponding parameters into the calculation file; if the selected material model shows a material instability warning, a new model should be selected for fitting.

[0083] If the test conditions in the second step are not available, the material constitutive equation parameter values ​​can be obtained based on the hardness and elastic modulus values ​​of the pipeline material, combined with the MR empirical formula. However, this method mainly relies on experience and has relatively poor accuracy.

[0084] Step 4: Assign the material constitutive equation parameters obtained in Step 3 to the blow-molded pipe, and set the material properties, boundary conditions, and suspension point stiffness values ​​of other components in the model. Check the counterweight and center of mass position of the intercooler model to ensure consistency with the relevant parameters of the geometric model under working conditions.

[0085] Step 5: Determine one of the external load inputs, namely the load magnitude caused by the powertrain motion. The displacement and rotation angle values ​​of the center of gravity corresponding to the 28 operating conditions of the powertrain during vehicle motion need to be converted into displacement inputs (Δxi, Δyi, Δzi) at the connection point between the intercooler blow molding pipe and the engine. This will be used as one of the external load inputs. The specific method is as follows:

[0086] 51) Select the most severe operating condition Ψ among the 28 operating conditions of the powertrain. i (i = 1, 2, 3...), the engine centroid A(x) corresponding to the severe operating conditions. a y a , z a The spatial translational moments along the three axes are X i Y i Z i The rotation amounts are respectively θ xi θ yi θ zi During vehicle movement, the blow-molded piping undergoes translational and rotational motion driven by the engine. The coordinates of the connection point between the blow-molded piping and the engine are B(x). b y b , z b );

[0087] 52) Establish a new coordinate system with the centroid A as the origin, and the x, y, and z directions are the same as those of the vehicle coordinate system; in the new coordinate system, the coordinates of the centroid are transformed into A1(0, 0, 0), and the coordinates of the connection point between the blow molding pipe and the engine are transformed into B1(x1, y1, z1), where x1 = x b -x a y1=y b -y a , z1=z b -z a ;

[0088] 53) Rotate point B1 about point A1, with the rotation angles about the three axes being θ. xi θ yi θ zi After rotation, we get C(x) c y c , z c )point;

[0089] See Figure 2 The coordinates of point C can be determined in the following two ways:

[0090] (1) The first method is to obtain the specific coordinate values ​​of the corresponding points after coordinate transformation through mathematical formulas. The specific steps are as follows:

[0091] S11, rotate point B1(x1, y1, z1) by θ around the X-axis. xiGiven B2(x1, y2, z2), the relative positions of the two points in the coordinate system before and after rotation; where HB1 = HB2, then:

[0092]

[0093] After combining the two equations and performing the calculations, we get:

[0094]

[0095] Then, the coordinates of point B2 after rotation are (x1, y1cosθ) xi -z1sinθ xi ,z1cosθ xi +y1sinθ xi );

[0096] S12, repeat S11), to obtain successive rotations θ around the Y-axis. yi and rotation θ around the Z-axis zi The coordinates B3(x3, y2, z3) and B4(x4, y4, z3) are obtained after three rotations. Point B4 is point C obtained after three rotations.

[0097] (2) The second method involves using Hypermesh software to determine the coordinates of point C after rotation. The specific steps are as follows:

[0098] S21) In the Geom panel of the HyperMesh software, select Nodes and enter the coordinates of A1(0, 0, 0) and B1(x1, y1, z1) respectively. Click Create and the newly created points A1 and B1 will appear in space.

[0099] S22) In the tool panel, select rotate, select the newly created point B1, set the rotation direction to around the X-axis, select the newly created point A1 as the rotation base point, and set the corresponding angle to θ. xi Click rotate+;

[0100] S23) Select the rotated point B1, and rotate it around the Y-axis and Z-axis by the corresponding angles θ. yi and θ zi ;

[0101] S24) After three rotations, point B1 reaches a new position. Click the Card edit button, select the rotated point B1, and click edit. The coordinates displayed on the panel are C(x) c y c , z c )coordinate.

[0102] 54) We obtain point C(x) c y c , zc After obtaining the coordinates, continue to translate the corresponding displacements (X, Y, Z) along the x, y, and z directions respectively. i Y i Z i The final position D(x) of the connection point B1 after its movement is obtained. d y d , z d The difference between the coordinates of point B1 and point B1 is the total translational displacement (Δxi, Δyi, Δzi) caused by the powertrain driving the blow molding pipeline, where:

[0103]

[0104] Step Six: Determine the second external load input, namely the load magnitude caused by the external working pressure; set all the meshes on the surface of the intercooler chamber and the blow-molded pipe inner cavity as a set of elements, which serves as the excitation point of the internal cavity gas pressure under working conditions. At this time, it should be ensured that the normals of all shell elements are consistent, and the corresponding load can be added according to the internal pressure; combined with the extreme displacement (Δxi, Δyi, Δzi) of the connection point between the blow-molded pipe and the engine obtained in Step Five and the internal cavity gas pressure, the two together are the main external loads borne by the intercooler blow-molded pipe during vehicle movement.

[0105] Step 7: Set the model to nonlinear implicit static solution, use all the mesh models of the blow-molded pipe as deformation output points, and export the deformation of the surface nodes of the blow-molded pipe along the X, Y, and Z directions in the form of a cloud map. The resulting three-dimensional space is the envelope space of the blow-molded pipe during vehicle movement.

[0106] The following section uses a specific vehicle model as an example to explain in detail the calculation method for the envelope space of the intercooler blow molding pipes.

[0107] Step 1: Based on the 3D models of the intercooler, bracket, and blow-molded piping provided by the design department, use Hypermesn software to perform geometric cleanup and extract the neutral layer surfaces of the corresponding components. Then, use shell elements to mesh the components and establish a mesh model. Figure 3 This is a schematic diagram of the intercooler piping system of a certain vehicle model. The intercooler is connected to the vehicle body structure via a mounting structure. In this invention, a jointc element is used to simulate the stiffness of the mounting point. Based on the measured stiffness values, the stiffness values ​​of the jointc element in each of the six degrees of freedom are defined, as shown in Table 1. It should be noted that, for ease of description, the stiffness of each mounting point in this example is linear in all six directions. If the measured stiffness is nonlinear, the stiffness curve of the jointc element in each direction needs to be defined according to the actual situation.

[0108] Table 1 Stiffness values ​​at each suspension point

[0109]

[0110]

[0111] Step 2: The actual stress-strain curve of the blow-molded pipe material was obtained through experiments. Since the performance of blow-molded materials is greatly affected by temperature, the pipe working temperature of 75℃ was selected for testing in this embodiment. The uniaxial tensile stress-strain data of the material at this temperature are shown in Table 2.

[0112] Table 2 Actual Stress and Strain Values ​​of Materials

[0113]

[0114] Step 3: Use Abaqus software to perform material curve fitting on the above experimental data. The specific steps are as follows:

[0115] 31) Define the hyperelastic material in the Part module and import the relevant values ​​of the stress-strain curve of the material obtained from the experiment into the edit material module.

[0116] 32) After the data is read, click Evaluate and select multiple constitutive equations for fitting. In this embodiment, three models are selected for fitting: the Polynomial model (N=1, 2) and the Ogden model (N=2). The curve fitting results in this embodiment are as follows: Figure 4 As shown.

[0117] 33) After the fitting calculation is completed, select the constitutive equation that shows good material stability and the best fitting effect within the given strain range. Based on the fitting effect, this embodiment selects the Polynomial model (N=2). The corresponding material definition statements in the calculation file are as follows:

[0118] *MATERIAL,NAME=TPC-EE

[0119] *DENSITY

[0120] 1.2200E-09,0.0

[0121] *HYPERELASTIC,N=2,POLYNOMIAL,TEST DATA INPUT

[0122] *UNIAXIAL TEST DATA

[0123] 0.0,0.0

[0124] 0.47561,8.0000E-06

[0125] 0.53981, 8.4580E-04

[0126] 0.67925, 0.0025252

[0127] 7.38812, 0.118034

[0128] 8.07414, 0.18019

[0129] 8.43535, 0.304509

[0130] 8.63283, 0.49098

[0131] 8.99693, 0.739614

[0132] 9.29867, 0.926087

[0133] 9.60992, 1.11257

[0134] 9.94188, 1.29903

[0135] 10.292, 1.48551

[0136] 10.6667, 1.67198

[0137] 11.0713, 1.85846

[0138] 11.5087, 2.04493

[0139] 11.9728, 2.23141

[0140] 12.4628, 2.41789

[0141] 12.9779, 2.60436

[0142] 13.5289, 2.79083.

[0143] Step 4: Assign the material constitutive equation parameters obtained in Step 3 to the blow-molded pipe, and set the material properties, boundary conditions, and suspension point stiffness values ​​of other components in the model. Check the counterweight and center of mass position of the intercooler model to ensure consistency with the relevant parameters of the geometric model under working conditions.

[0144] Step 5: Determine one of the external load inputs, namely the load caused by the powertrain movement. A schematic diagram of the connection between the powertrain and the intercooler piping system is shown below. Figure 5 As shown, this step requires converting the displacement and rotation angle of the center of mass A corresponding to powertrain operating condition 28 during vehicle movement into the displacement input (Δxi, Δyi, Δzi) of the connection point B between the intercooler blow molding pipe and the powertrain, and using this as one of the external load inputs. The specific steps are as follows:

[0145] 51) This example uses the most severe first-gear extreme impact condition from powertrain operating condition 28 for illustration. The spatial translational moments of the powertrain's center of mass A (1538, 17.22, 641.8) along the three axes corresponding to this condition are 1.65, -2.95, and -1.59, respectively, and the rotational moments are -0.97, 3.64, and 0.36, respectively. During vehicle movement, the blow-molded piping undergoes translational and rotational motion driven by the powertrain. The coordinates of its connection point with the powertrain are B (1267, 138.2, 757.8); (Note: Length unit is mm, angle unit is deg)

[0146] 52) Establish a new coordinate system with the center of mass A as the origin, and the x, y, and z directions are the same as the vehicle coordinate system. In the new coordinate system, the coordinates of the center of mass are transformed into A1(0, 0, 0), and the coordinates of the connection point between the blow molding pipe and the powertrain are transformed into B1(-271, 121, 116).

[0147] 53) Using the two methods described in this invention, after calculation, it can be obtained that after B1 rotates around A1 along three axes by -0.97, 3.64, and 0.36 respectively, the coordinates of point C are (-262.3, 118.3, 129.3);

[0148] 54) Based on this, point C is translated along the x, y, and z directions by corresponding displacements of 1.65, -2.95, and -1.59, respectively, ultimately bringing the powertrain's center of mass to the working condition Ψ. i The amount of motion is converted into the translational displacement of the connection point between the blow-molded tube and the powertrain, which is 8.63, -2.66, and 13.3 along the X, Y, and Z axes, respectively.

[0149] Step Six: Determine the second external load input, namely the load magnitude caused by the external working pressure. Set all the meshes on the surface of the intercooler chamber and the inner cavity of the blow-molded pipe as a set of elements, which serves as the excitation point for the internal gas pressure under working conditions. At this time, it should be ensured that the normals of all shell elements are consistent. In this example, the internal pressure of the pipe is 0.2 MPa. Add the corresponding load under the pressure panel. Combining the extreme displacement of the connection point between the blow-molded pipe and the powertrain obtained in Step Five (8.63, -2.66, 13.3) and the internal gas pressure, the combined effect of the two is the main external load borne by the intercooler blow-molded pipe under the first gear extreme impact condition.

[0150] Step 7: Set the above calculation model as a nonlinear implicit static solution, take all the mesh models of the blow-molded pipe as deformation output points, and derive the deformation of the surface nodes of the blow-molded pipe along the X, Y and Z directions in the form of a cloud map. The three-dimensional space formed by these is the envelope space formed by the blow-molded pipe under the first-gear extreme impact condition.

[0151] Example 2

[0152] Figure 6 This is a schematic diagram of a calculation device for the envelope space of blow-molded pipes in a passenger vehicle intercooler, provided in Embodiment 2 of the present invention. This embodiment is applicable to the calculation of the envelope space of blow-molded pipes in a passenger vehicle intercooler. The device can be implemented using software and / or hardware, and can be integrated into any device that provides calculation functions for the envelope space of blow-molded pipes in a passenger vehicle intercooler, such as… Figure 5 As shown, the calculation device for the envelope space of the blow-molded pipes of the intercooler in a passenger vehicle specifically includes:

[0153] A model building module is used to build a network model of the intercooler blow molding piping.

[0154] The stress-strain data acquisition module is used to obtain the actual stress-strain data of blow-molded pipe materials at a given operating temperature through tensile testing.

[0155] The fitting module is used to organize the obtained actual stress and strain data, fit the constitutive equation parameters of the blow-molded pipe material at different working temperatures, and assign the material constitutive equation parameters of the blow-molded pipe at the corresponding working temperature according to the different working temperatures in the subsequent calculation process.

[0156] The verification module is used to assign the obtained material constitutive equation parameters to the blow molding pipeline, and to set the material properties, boundary conditions, and suspension point stiffness values ​​of other components in the model. It also verifies the counterweight and center of mass position of the intercooler model to ensure consistency with the relevant parameters of the geometric model under working conditions.

[0157] The first determining module is used to determine one of the external load inputs, namely the magnitude of the load caused by the powertrain motion;

[0158] The second determining module is used to determine the second external load input, namely the load magnitude caused by the external working pressure.

[0159] The calculation module is used to set the model as a nonlinear implicit static solution, and uses all the mesh models of the blow-molded pipe as deformation output points. It derives the deformation of the surface nodes of the blow-molded pipe along the X, Y, and Z directions in the form of a cloud map. The resulting three-dimensional space is the envelope space of the blow-molded pipe during vehicle movement.

[0160] The above-described products can perform the methods provided in any embodiment of the present invention, and have the corresponding functional modules and beneficial effects for performing the methods.

[0161] Example 3

[0162] Figure 7 This is a schematic diagram of the structure of a computer device according to Embodiment 3 of the present invention. Figure 7A block diagram of an exemplary computer device 12 suitable for implementing embodiments of the present invention is shown. Figure 7 The computer device 12 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of the present invention.

[0163] like Figure 6 As shown, the computer device 12 is represented in the form of a general-purpose computing device. The components of the computer device 12 may include, but are not limited to: one or more processors or processing units 16, system memory 28, and a bus 18 connecting different system components (including system memory 28 and processing unit 16).

[0164] Bus 18 represents one or more of several bus architectures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of the various bus architectures. For example, these architectures include, but are not limited to, the Industry Standard Architecture (ISA) bus, the Micro Channel Architecture (MAC) bus, the Enhanced ISA bus, the Video Electronics Standards Association (VESA) local bus, and the Peripheral Component Interconnect (PCI) bus.

[0165] Computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by computer device 12, including volatile and non-volatile media, removable and non-removable media.

[0166] System memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. Computer device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, storage system 34 may be used to read and write non-removable, non-volatile magnetic media (…). Figure 7 Not shown; usually referred to as a "hard drive"). Although Figure 7 Not shown, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk") and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 via one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules configured to perform the functions of the embodiments of the present invention.

[0167] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28. Such program modules 42 include—but are not limited to—an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include an implementation of a network environment. Program modules 42 typically perform the functions and / or methods described in the embodiments of the present invention.

[0168] The computer device 12 can also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), and with one or more devices that enable a user to interact with the computer device 12, and / or with any device that enables the computer device 12 to communicate with one or more other computing devices (e.g., network card, modem, etc.). This communication can be performed via the input / output (I / O) interface 22. Furthermore, in this embodiment, the computer device 12 and display 24 are not separate entities, but are embedded in a mirror, so that when the display surface of the display 24 is not displayed, the display surface of the display 24 and the mirror surface visually blend together. Additionally, the computer device 12 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via the network adapter 20. As shown, the network adapter 20 communicates with other modules of the computer device 12 via the bus 18. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0169] The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28, such as implementing a method for calculating the envelope space of blow-molded pipes for intercoolers in passenger vehicles provided in this embodiment of the invention.

[0170] Example 4

[0171] Embodiment 4 of the present invention provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a method for calculating the envelope space of a blow-molded pipe in an intercooler of a passenger vehicle as provided in all embodiments of the present application.

[0172] Any combination of one or more computer-readable media may be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0173] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including—but not limited to—electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of transmitting, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0174] The program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0175] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0176] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for calculating the envelope space of blow-molded pipes in an intercooler of a passenger vehicle, characterized in that, Includes the following steps: Step 1: Establish the network model of the intercooler blow molding piping; Step 2: Obtain the actual stress and strain data of the blow-molded pipe material at a given operating temperature through tensile testing; Step 3: Organize the actual stress and strain data obtained in Step 2, fit the constitutive equation parameters of the blow-molded pipe material at different working temperatures, and assign the material constitutive equation parameters of the blow-molded pipe at the corresponding working temperature according to the different working temperatures in the subsequent calculation process. Step 4: Assign the material constitutive equation parameters obtained in Step 3 to the blow-molded pipe, and set the material properties, boundary conditions, and suspension point stiffness values ​​of other components in the model. Check the counterweight and center of mass position of the intercooler model to ensure consistency with the relevant parameters of the geometric model under working conditions. Step 5: Determine one of the external load inputs, namely the magnitude of the load caused by the powertrain motion; Step 6: Determine the second external load input, namely the load magnitude caused by the external working pressure; Step 7: Set the model to nonlinear implicit static solution, use all the mesh models of the blow-molded pipe as deformation output points, and export the deformation of the surface nodes of the blow-molded pipe along the X, Y, and Z directions in the form of a cloud map. The resulting three-dimensional space is the envelope space of the blow-molded pipe during vehicle movement.

2. The method for calculating the envelope space of blow-molded pipes in an intercooler of a passenger vehicle according to claim 1, characterized in that, The specific method for step one is as follows: Based on the 3D models of the intercooler, bracket, and blow-molded pipes provided by the design department, the geometry was cleaned up using Hypermesn software and the neutral layer surfaces of the corresponding components were extracted. Shell elements were used for mesh generation to establish the mesh model, and flexible elements were used to simulate the stiffness.

3. The method for calculating the envelope space of blow-molded pipes in an intercooler of a passenger vehicle according to claim 1, characterized in that, In step two, for small deformation simulation, the tensile test includes at least uniaxial tension, and for large deformation simulation, the tensile test is multiaxial tension; ensuring that the strain in the tensile test is greater than the maximum strain that the material may actually experience.

4. The method for calculating the envelope space of blow-molded pipes in an intercooler of a passenger vehicle according to claim 1, characterized in that, In step three, the specific steps for fitting the material constitutive equation using Abaqus software are as follows: 31) Define the hyperelastic material in the Part module and import the relevant values ​​of the actual stress-strain curve of the material obtained from the experiment into the edit material module; 32) After the data is read, click Evaluate and select multiple constitutive equations for fitting; 33) After the fitting calculation is completed, select the constitutive equation with the best material stability and the best fitting effect, and write the corresponding parameters into the calculation file; If the selected material model indicates material instability, a new model should be selected for fitting.

5. The method for calculating the envelope space of blow-molded pipes in an intercooler of a passenger vehicle according to claim 1, characterized in that, The specific method for step five is as follows: 51) Select the most severe operating condition Ψ among the 28 operating conditions of the powertrain. i (i=1, 2, 3...), the engine centroid A(x) corresponding to severe operating conditions a y a , z a The spatial translational moments along the three axes are X i Y i Z i The rotation amounts are respectively θ xi θ yi θ zi During vehicle movement, the blow-molded piping undergoes translational and rotational motion driven by the engine. The coordinates of the connection point between the blow-molded piping and the engine are B(x). b y b , z b ); 52) Establish a new coordinate system with the centroid A as the origin, and the x, y, and z directions are the same as the vehicle coordinate system; in the new coordinate system, the coordinates of the centroid are transformed into A1(0, 0, 0), and the coordinates of the connection point between the blow molding pipe and the engine are transformed into B1(x1, y1, z1), where x1 = x b -x a y1=y b -y a z1=z b -z a ; 53) Rotate point B1 about point A1, with the rotation angles about the three axes being θ. xi θ yi θ zi After rotation, we get C(x) c y c , z c )point; 54) We obtain point C(x) c y c , z c After obtaining the coordinates, continue to translate the corresponding displacements (X, Y, Z) along the x, y, and z directions respectively. i Y i Z i The final position D(x) of the connection point B1 after its movement is obtained. d y d , z d The difference between the coordinates of point B1 and point B1 is the total translational displacement (Δxi, Δyi, Δzi) caused by the powertrain driving the blow molding pipeline, where: 。 6. The method for calculating the envelope space of blow-molded pipes in an intercooler of a passenger vehicle according to claim 5, characterized in that, The coordinates of point C in step 53) can be determined in the following two ways: (1) The first method is to obtain the specific coordinate values ​​of the corresponding points after coordinate transformation through mathematical formulas. The specific steps are as follows: S11, rotate point B1(x1, y1, z1) by θ around the X-axis. xi Given B2(x1, y2, z2), the relative positions of the two points in the coordinate system before and after rotation; where HB1 = HB2, then: ； After combining the two equations and performing the calculations, we get: ； Then, the coordinates of point B2 after rotation are (x1, y1cosθ). xi -z1sinθ xi ,z1cosθ xi +y1sinθ xi ); S12, repeat S11), to obtain successive rotations θ around the Y-axis. yi and rotation θ around the Z-axis zi The coordinates B3 (x3, y2, z3) and B4 (x4, y4, z3) are then obtained. Point B4 is point C obtained after three rotations. (2) The second method is to determine the coordinates of point C after rotation using the Hypermesh software. The specific steps are as follows: S21) In the Geom panel of the HyperMesh software, select Nodes and enter the coordinates of A1 (0, 0, 0) and B1 (x1, y1, z1) respectively. Click Create and the newly created points A1 and B1 will appear in space. S22) In the tool panel, select rotate, select the newly created point B1, set the rotation direction to around the X-axis, select the newly created point A1 as the rotation base point, and set the corresponding angle to θ. xi Click rotate+; S23) Select the rotated point B1, and rotate it around the Y-axis and Z-axis by the corresponding angles θ. yi and θ zi ; (S24) After three rotations, point B1 reaches a new position. Click the Card edit button, select the rotated point B1, and click edit. The coordinates displayed on the panel are C(x) c y c , z c )coordinate.

7. The method for calculating the envelope space of blow-molded pipes in an intercooler of a passenger vehicle according to claim 6, characterized in that, The specific method for step six is ​​as follows: Set all the meshes on the surface of the intercooler chamber and the inner cavity of the blow-molded pipe as a set of elements, which serve as the excitation points for the gas pressure in the inner cavity under working conditions. At this time, it should be ensured that the normals of all shell elements are consistent, and the corresponding loads can be added according to the magnitude of the internal pressure. Combine the extreme displacements (Δxi, Δyi, Δzi) of the connection point between the blow-molded pipe and the engine obtained in step five with the gas pressure in the inner cavity, the two together act as the main external loads borne by the intercooler blow-molded pipe during vehicle movement.

8. A calculation device for the envelope space of blow-molded pipes in an intercooler of a passenger vehicle, characterized in that, The device includes: A model building module is used to build a network model of the intercooler blow molding piping. The stress-strain data acquisition module is used to obtain the actual stress-strain data of blow-molded pipe materials at a given operating temperature through tensile testing. The fitting module is used to organize the obtained actual stress and strain data, fit the constitutive equation parameters of the blow-molded pipe material at different working temperatures, and assign the material constitutive equation parameters of the blow-molded pipe at the corresponding working temperature according to the different working temperatures in the subsequent calculation process. The verification module is used to assign the obtained material constitutive equation parameters to the blow molding pipeline, and to set the material properties, boundary conditions, and suspension point stiffness values ​​of other components in the model. It also verifies the counterweight and center of mass position of the intercooler model to ensure consistency with the relevant parameters of the geometric model under working conditions. The first determining module is used to determine one of the external load inputs, namely the magnitude of the load caused by the powertrain motion; The second determining module is used to determine the second external load input, namely the load magnitude caused by the external working pressure. The calculation module is used to set the model as a nonlinear implicit static solution, and uses all the mesh models of the blow-molded pipe as deformation output points. It derives the deformation of the surface nodes of the blow-molded pipe along the X, Y, and Z directions in the form of a cloud map. The resulting three-dimensional space is the envelope space of the blow-molded pipe during vehicle movement.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements a method for calculating the envelope space of the blow-molded pipe of an intercooler in a passenger vehicle as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by the processor, the program implements a method for calculating the envelope space of the blow-molded pipes of an intercooler in a passenger vehicle as described in any one of claims 1-7.

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