CN112906279B - Method for controlling vibration of engine hood - Google Patents
Method for controlling vibration of engine hood Download PDFInfo
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- CN112906279B CN112906279B CN202110254944.1A CN202110254944A CN112906279B CN 112906279 B CN112906279 B CN 112906279B CN 202110254944 A CN202110254944 A CN 202110254944A CN 112906279 B CN112906279 B CN 112906279B
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Abstract
The invention relates to the technical field of engine hood vibration control, in particular to a method for controlling the vibration of an engine hood, which comprises the following steps of collecting CATIA data of the engine hood; establishing a finite element model of the engine cover closing state; determining a vibration response point of the engine cover; analyzing engine cover vibration response; post-processing the calculation result, and repeating the step S1 when the calculation result does not meet the requirement; and when the calculation result meets the requirement, the design is frozen. According to the invention, a finite element model of the closed state of the engine hood is established, road surface excitation is applied to the left hinge end, the right hinge end and the lock catch end, the vibration response result of the engine hood is obtained through calculation, and the vibration deformation of the engine hood is obtained through post-processing of the result, so that the aim of controlling the vibration of the engine hood is achieved. In order to improve the working efficiency, the invention compiles an automatic post-processing program according to the post-processing calculation expression, and carries out batch processing on the calculation results, thereby greatly improving the efficiency.
Description
Technical Field
The invention relates to the technical field of engine hood vibration control, in particular to a method for controlling vibration of an engine hood.
Background
With the rapid development of the domestic automobile industry, the requirement of consumers on the NVH performance of automobiles is higher and higher, and the performances of automobile vibration and noise in automobiles are more and more concerned by various automobile enterprises. In the actual road driving process of the automobile, the engine hood can vibrate due to the excitation of the road surface, the visual angle of a driver is influenced, and the failure is easily caused by the long-term vibration, so that the prediction and the control of the engine hood vibration are very important.
At present, the control of the vibration of the engine hood is only carried out subjectively after a real vehicle is manufactured, if the vibration level of the engine hood is too poor, the engine hood is adjusted mainly by depending on the experience of engineers so as to improve the vibration, and manpower and material resources are wasted, so the vibration of the engine hood is considered in the design stage, and the vibration of the engine hood can be better controlled by adopting the method.
The invention provides a method for controlling the vibration of an engine hood, which comprises the steps of establishing a finite element model of the closed state of the engine hood, applying road surface excitation on a left hinge end, a right hinge end and a lock catch end, calculating to obtain a vibration response result of the engine hood, and carrying out post-processing on the result to obtain the vibration deformation of the engine hood so as to achieve the aim of controlling the vibration of the engine hood. In order to improve the working efficiency, the invention compiles an automatic post-processing program according to the post-processing calculation expression, and carries out batch processing on the calculation results, thereby greatly improving the efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for controlling the vibration of a hood, which is used for controlling the vibration of the hood, controlling the vibration deformation of the hood within a reasonable range and positively guiding the design and development of the hood.
In order to realize the purpose of the invention, the invention adopts the technical scheme that:
the invention discloses a method for controlling the vibration of an engine cover, which comprises the following steps,
step S1, collecting hood CATIA data;
step S2, establishing a finite element model of the engine cover closing state;
step S3, determining a hood vibration response point;
step S4, hood vibration response analysis;
step S5, post-processing the calculation result, and repeating the step S1 when the calculation result does not meet the requirement; and when the calculation result meets the requirement, the design is frozen.
In the step S1, the CATIA data includes material grades, welding point data, connection modes, rigidity of the buffer block, and rigidity of the sealing strip of the inner plate, the outer plate, the reinforcing plate, the hinge, the latch, the sealing strip, and the buffer block.
In the step S2, the finite element model includes an inner plate, an outer plate, a reinforcing plate, a lock catch, a hinge, a sealing strip and a buffer block, the lock catch is disposed in the middle of the front end of the lower surface of the bonnet, the bonnet is connected with the vehicle body through the lock catch, and both sides of the rear end of the lower surface of the bonnet are provided with hinges for hinging with the vehicle body; the buffer block set up in the lower surface front end both sides of bonnet, the sealing strip set up in the lower surface rear end of bonnet, when the bonnet closed, buffer block and sealing strip and automobile body contact, and all adopt the spring unit to simulate hasp and hinge and body coupling, sealing strip and buffer block and automobile body contact, adopt a rigidity unit to connect the free one end of spring unit.
In step S3, the vibration response points include a first node and a second node respectively disposed on the hinges on both sides, a third node disposed on the latch, a fourth node disposed in the middle of the rear end of the hood, a fifth node disposed in the center of the hood, a sixth node and a seventh node disposed on both sides of the front end of the hood, an eighth node and a ninth node disposed in the maximum amplitude areas on both sides of the hood, a tenth node and an eleventh node disposed above and below the left side buffer block, and a twelfth node and a thirteenth node disposed above and below the right side buffer block.
In step S4, the vibration response analysis includes setting a response boundary: the first node and the second node restrain all degrees of freedom, the third node restrains Y/Z translational degree of freedom, the first node, the second node and the third node respectively apply Z-direction excitation load on the road surface, and calculation is submitted, wherein the calculation formula is as follows:
in the above formula, [ M ]]Representing a quality matrix; [ C ]]Representing a damping matrix; [ K ]]Representing a stiffness matrix; { F } represents the outer load vector matrix;
representing node acceleration;
a node speed; { u } represents a node displacement vector; (t) represents a load application time; and (3) repeatedly applying excitation loads of 6 same road surfaces according to the response boundary to finally obtain 6 vibration response results.
In step S5, the post-processing of the calculation result is to compile an automatic post-processing program according to the post-processing calculation expression, run the compiled automatic post-processing program, and finally obtain the vibration deformation amount of the bonnet response point.
The invention has the beneficial effects that:
1. according to the invention, a finite element model of the closed state of the engine hood is established, road surface excitation is applied to the left hinge end, the right hinge end and the lock catch end, the vibration response result of the engine hood is obtained through calculation, and the vibration deformation of the engine hood is obtained through post-processing of the result, so that the aim of controlling the vibration of the engine hood is achieved. In order to improve the working efficiency, the invention compiles an automatic post-processing program according to the post-processing calculation expression, and carries out batch processing on the calculation results, thereby greatly improving the efficiency.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a simulation model of the hood of the present invention;
FIG. 3 is a schematic view of a hood vibration response point arrangement according to the present invention;
FIG. 4 is a diagram of the results of the present invention utilizing an automatic post-processing routine;
FIG. 5 is a finite element model of the hood of the present invention;
FIG. 6 is a schematic diagram of the determination of modal results in the present invention.
In the figure, 1 is a first node, 2 is a second node, 3 is a third node, 4 is a fourth node, 5 is a fifth node, 6 is a sixth node, 7 is a seventh node, 8 is an eighth node, 9 is a ninth node, 10 is a tenth node, 11 is an eleventh node, 12 is a twelfth node, 13 is a thirteenth node, 14 is a hinge, 15 is a lock catch, 16 is a sealing strip, 17 is a buffer block and 18 is a hood.
Detailed Description
The invention is further illustrated with reference to the following figures and examples:
see fig. 1-6.
The invention discloses a method for controlling vibration of an engine hood, which comprises the following steps:
1) collecting data of the engine hood CATIA, including an inner plate, an outer plate, a reinforcing plate, a hinge 14, a lock catch 15, a sealing strip 16 and a buffer block 17, and collecting material marks, welding spot data, connection modes, the rigidity of the buffer block, the rigidity of the sealing strip and the like of corresponding parts.
2) The hood 18 is latticed using shell elements, giving the inner and outer panels, the reinforcement panels, and the hinges 14 steel material. The models are connected according to the welding spot data and the connection mode, and the finished finite element model is shown in figure 5.
3) The connection of the lock catch 15 and the hinge 14 with the vehicle body and the contact of the sealing strip 16 and the buffer block 17 with the vehicle body are simulated by adopting a spring unit, and the free end of the spring unit is connected by adopting a rigid unit. The left and right hinge 14 end nodes 1, 2 and latch 15 end node 3 serve as the actuation load points, the model is shown in FIG. 2.
4) And (5) carrying out modal analysis. The first node 1 and the second node 2 of the left hinge 14 and the right hinge 14 constrain all degrees of freedom, the third node 3 of the lock catch 15 constrains the X/Y/Z translational degree of freedom, and the torsional mode around the X-axis direction and the maximum amplitude position of the two side edges of the engine cover 18 along the Z direction are obtained through calculation. As shown in fig. 6, the sixth node 6 and the seventh node 7 on the hood 18 are maximum amplitude regions.
5) And determining a response point. The representative response points are used to evaluate the overall vibration effect of the hood 18, and the detailed study on the structure of the hood 18 is performed to determine the vibration response points by using the left and right foremost corner points, the center rearmost edge point, the center point of the hood 18, and the two points with the maximum left and right amplitudes determined by the mode results of fig. 6, as shown in fig. 3.
6) And analyzing the vibration response. The kinetic expression is as follows:
[M]representing a quality matrix; [ C ]]Representing a damping matrix; [ K ]]Representing a stiffness matrix; { F } represents the outer load vector matrix;
representing node acceleration;
a node speed; { u } represents a node displacement vector; (t) represents a load application time.
7) And (5) modal transient response analysis. Setting a response boundary: the first node 1 and the second node 2 of the left hinge 14 and the right hinge 14 constrain all degrees of freedom, the third node 3 of the lock catch 15 constrains the Y/Z translational degree of freedom, and the first node 1, the second node 2 and the third node 3 respectively apply pavement Z-direction excitation loads to submit calculation. And (3) repeatedly applying excitation loads of 6 same road surfaces according to the response boundary to finally obtain 6 vibration response results.
8) And (5) post-processing the response result. The post-processing expression is as follows. In order to realize batch processing of a plurality of results and improve the working efficiency, the invention writes a post-processing automatic processing program, such as an automatic post-processing program processing result chart shown in fig. 4. The results are extracted and evaluated to enable control of the hood 18 vibration during the design phase.
Vibration calculation expression:
1. vibration calculation expression:
ZV1＝|z3-z6i (formula 1)
ZV in formula (1)1The absolute value of the difference is displaced for the third node 3 and the sixth node 6 at each point in time.
ZV2＝|z3-z7I (formula 2)
In formula (2) ZV2The absolute value of the difference is displaced for the third node 3 and the seventh node 7 at each point in time.
ZV3＝|z3-z8I (formula 3)
In formula (3) ZV3The absolute value of the difference is displaced for the third node 3 and the eighth node 8 at each point in time.
ZV4＝|z3-z9I (formula 4)
ZV in formula (4)4The absolute value of the difference is displaced for the third node 3 and the ninth node 9 at each point in time.
ZV5＝|z4-z1I (formula 5)
In formula (5) ZV5The absolute value of the difference between the fourth node 4 and the first node 1 at each time point is displaced.
ZV6＝|z4-z2[ equation 6 ]
ZV in formula (6)6The absolute value of the difference between the displacement of the fourth node 4 and the second node 2 at each point in time.
ZV in formula (7)7The absolute value of the difference between the fourth node 4 and the displacement of a at each time point, where a is the average of the displacement sums of the first node 1 and the second node 2 at each time point.
ZV in formula (8)8The absolute value of the difference between the displacement of the fifth node 5 and the displacement of the fourth node 4 at each time point is shown, wherein B is the average value of the displacement sum of the eighth node 8 and the ninth node 9 at each time point, and C is the average value of the displacement sum of the eighth node 8 and the ninth node 9 at each time point.
ZVn is the maximum value for each n.
2. Description of node number
Sixth node 6 → response point 6, left edge
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention and the contents of the drawings or directly or indirectly applied to the related technical fields are included in the scope of the present invention.
Claims (2)
1. A method of controlling hood vibration, comprising: comprises the following steps of (a) carrying out,
step S1, collecting hood CATIA data;
step S2, establishing a finite element model of the engine cover closing state;
step S3, determining a hood vibration response point;
step S4, hood vibration response analysis;
step S5, post-processing the calculation result, and repeating the step S1 when the calculation result does not meet the requirement; when the calculation result meets the requirement, freezing is designed;
in the step S2, the finite element model includes an inner plate, an outer plate, a reinforcing plate, a lock catch, a hinge, a sealing strip and a buffer block, the lock catch is disposed in the middle of the front end of the lower surface of the bonnet, the bonnet is connected with the vehicle body through the lock catch, and both sides of the rear end of the lower surface of the bonnet are provided with hinges for hinging with the vehicle body; the buffer blocks are arranged on two sides of the front end of the lower surface of the engine cover, the sealing strip is arranged at the rear end of the lower surface of the engine cover, when the engine cover is closed, the buffer blocks are in contact with the sealing strip and the vehicle body, the lock catch and the hinge are connected with the vehicle body, the sealing strip and the contact of the buffer blocks and the vehicle body are simulated by adopting the spring unit, and a rigid unit is adopted to connect the free end of the spring unit;
in step S3, the vibration response point includes a first node and a second node respectively disposed on the hinges on both sides, a third node disposed on the latch, a fourth node disposed in the middle of the rear end of the hood, a fifth node disposed in the center of the hood, a sixth node and a seventh node disposed on both sides of the front end of the hood, an eighth node and a ninth node disposed in the maximum amplitude areas on both sides of the hood, a tenth node and an eleventh node disposed above and below the left side buffer block, and a twelfth node and a thirteenth node disposed above and below the right side buffer block;
in step S4, the vibration response analysis includes setting a response boundary: the first node and the second node restrain all degrees of freedom, the third node restrains Y/Z translational degree of freedom, the first node, the second node and the third node respectively apply Z-direction excitation load on the road surface, and calculation is submitted, wherein the calculation formula is as follows:
in the above formula, [ M ]]Representing a quality matrix; [ C ]]Representing a damping matrix; [ K ]]Representing a stiffness matrix; { F } represents the outer load vector matrix;
representing node accelerationDegree;
a node speed; { u } represents a node displacement vector; (t) represents a load application time; according to the response boundary, repeatedly applying excitation loads of 6 same road surfaces to finally obtain 6 vibration response results;
in step S5, the post-processing of the calculation result is to compile an automatic post-processing program according to the post-processing calculation expression, run the compiled automatic post-processing program, and finally obtain the vibration deformation amount of the bonnet response point.
2. A method of controlling hood vibration according to claim 1, wherein: in the step S1, the CATIA data includes material grades, welding point data, connection modes, rigidity of the buffer block, and rigidity of the sealing strip of the inner plate, the outer plate, the reinforcing plate, the hinge, the latch, the sealing strip, and the buffer block.
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