CN110926779A - Method for verifying pneumatic pressure connection strength of automobile front cabin cover assembly - Google Patents
Method for verifying pneumatic pressure connection strength of automobile front cabin cover assembly Download PDFInfo
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- CN110926779A CN110926779A CN201911206416.8A CN201911206416A CN110926779A CN 110926779 A CN110926779 A CN 110926779A CN 201911206416 A CN201911206416 A CN 201911206416A CN 110926779 A CN110926779 A CN 110926779A
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to the technical field of automobile structure pressure verification, in particular to a method for verifying pneumatic pressure connection strength of an automobile front cabin cover assembly. Calculating the maximum air flow acting force F of the front cabin cover assembly in the running process of the automobileFluid, especially for a motor vehicle(ii) a F is to beFluid, especially for a motor vehicleConverted into equivalent acting force F which can be applied to the front cabin cover assembly on the test equipmentEquivalence of(ii) a Extracting the equivalent force FEquivalence ofRole information of (1); arranging a use environment conforming to the front cabin cover assembly on a test bed, and then applying equivalent acting force F to the front cabin cover assemblyEquivalence ofActing force F with identical acting information1(ii) a And observing the state of the front cabin cover assembly under the stress action, and judging whether the structural design is reliable or not according to the test result. The test method of the invention simulates the pneumatic acting force applied to the automobile front cabin cover assembly in the running process by applying a centralized constraint mode under a static conditionWhether the connection strength of the front cabin cover assembly under the pneumatic pressure is reasonable or not is judged by the mode, and the method has great popularization value.
Description
Technical Field
The invention relates to the technical field of automobile structure pressure verification, in particular to a method for verifying pneumatic pressure connection strength of an automobile front cabin cover assembly.
Background
Most of automobile front cabin cover assemblies in the current market are assembly parts consisting of various thin-wall sheet metal parts, including a front cabin cover assembly outer plate, a front cabin cover assembly inner plate, a hinge reinforcing plate, a lock catch reinforcing plate, a front cabin cover assembly lock catch and the like. The outer plate of the front cabin cover assembly is used as a vehicle body appearance covering part, and the outer plate of the front cabin cover assembly is required to have no visible welding spot traces outside, so the inner plate and the outer plate of the front cabin cover assembly are generally connected together through structural glue and shock absorption glue. And the inner plate of the front cabin cover assembly is welded with support reinforcements such as hinges, lock catches and the like and is finally installed and fixed with the automobile front cabin framework through parts such as bolts, front cabin safety hooks and the like.
When the automobile runs at high speed, a pulling force perpendicular to the surface of the front cabin cover assembly is generated on the inner surface of the front cabin cover assembly due to the action of air power, and meanwhile, the inner plate of the front cabin cover assembly is restrained by the hinge and the lock catch, so that the front cabin cover assembly and the inner plate of the front cabin cover assembly are subjected to two acting forces in opposite directions during the running of the automobile. Because the inner plate and the outer plate of the front cabin cover assembly are glued together, the connection strength of the front cabin cover assembly must be capable of resisting the influence of the acting force, and the assembly is ensured to work normally. If the internal structure is not firm, the situation of user complaints such as driving jitter or driving noise can occur, and in an extreme case, the front cabin cover assembly can be failed in connection between a welding point and an adhesive under the action of strong pneumatics and is lifted in the driving process, so that the safety hazard is serious. At present, the problems do not have corresponding industry or national standards, so that technicians need to establish a verification method for identifying the structural connection strength of the front cabin cover assembly under the action of aerodynamic force so as to identify risks as early as possible and ensure the safety of vehicles.
Disclosure of Invention
The invention aims to solve the defects of the background technology and provide a method for verifying the pneumatic pressure connection strength of an automobile front cabin cover assembly.
The technical scheme of the invention is as follows: a method for verifying the pneumatic pressure connection strength of an automobile front cabin cover assembly is characterized by comprising the following steps: calculating the maximum air flow acting force F of the front cabin cover assembly in the running process of the automobileFluid, especially for a motor vehicle(ii) a F is to beFluid, especially for a motor vehicleConverted into equivalent acting force F which can be applied to the front cabin cover assembly on the test equipmentEquivalence of(ii) a Extracting the equivalent force FEquivalence ofRole information of (1); arranging a use environment conforming to the front cabin cover assembly on a test bed, and then applying equivalent acting force F to the front cabin cover assemblyEquivalence ofActing force F with identical acting information1(ii) a And observing the state of the front cabin cover assembly under the stress action, and judging whether the structural design is reliable or not according to the test result.
Further, the maximum airflow acting force F suffered by the front cabin cover assembly during the running process of the automobile is calculatedFluid, especially for a motor vehicleThe method comprises the following steps: simulating the pressure values born by the front cabin cover assembly under the action of wind directions at different angles under the condition of the highest vehicle speed in Fluent software, and deriving the maximum pressure value of the front cabin cover assembly as the fluid acting force F borne by the front cabin cover assembly in the driving process of the automobileFluid, especially for a motor vehicle。
Further said maximum airflow force FFluid, especially for a motor vehicleConverted into equivalent acting force F which can be applied to the front cabin cover assembly on the test equipmentEquivalence ofThe method comprises the following steps: maximum airflow force F borne by the front cabin cover assembly through Hyperview softwareFluid, especially for a motor vehicleMapping to the structural grid of the front cabin cover assembly, deriving the mapped pressure value, and converting the surface pressure acting on the structural grid of the front cabin cover assembly into wind acting on the front cabin cover assemblyPoint-concentrated force on the centre of compression, i.e. equivalent force FEquivalence of。
Further said equivalent force FEquivalence ofThe effect information of (1) includes FEquivalence ofThe position and direction of action of.
The method for arranging the service environment conforming to the front cabin cover assembly on the test bed further comprises the following steps: and (3) heating the test bed to be not less than 100 ℃, and simulating the heating condition of the engine compartment when the front compartment cover assembly is actually used.
Further, the front cabin cover assembly applies equivalent force FEquivalence ofActing force F with identical acting information1The method comprises the following steps: according to equivalent force FEquivalence ofThe front cabin cover assembly is loaded with acting force F at the same position and in the same direction1Simulating the pneumatic pressure of the front cabin cover assembly in the driving process, and gradually loading the front cabin cover assembly from small to large until F1And increasing to the design requirement value.
The method for observing the state of the front cabin cover assembly under the stress comprises the following steps: observing the deformation of the front cabin cover assembly under the action of stress, marking the separation position of the front cabin cover assembly when the separation between the inner plate and the outer plate of the front cabin cover assembly is observed, and recording the pressure value F borne by the front cabin cover assembly when the inner plate and the outer plate of the front cabin cover assembly are separatedPulling-off type。
The method for judging whether the structural design is reliable according to the test result comprises the following steps: the pressure value F borne by the front cabin cover assembly when the inner plate and the outer plate of the front cabin cover assembly are separatedPulling-off typeWith equivalent force FEquivalence ofMaking comparison if FPulling-off type＞FEquivalence ofThe design strength of the front cabin cover assembly is proved to be reasonable if FPulling-off type≤FEquivalence ofAnd the design strength of the front cabin cover assembly is proved to be unreasonable, and the structural design needs to be returned again for checking and confirmation.
The test method provided by the invention simulates the pneumatic acting force of the front cabin cover assembly of the automobile in the driving process by applying a centralized constraint mode under a static condition, judges whether the connection strength of the front cabin cover assembly under the pneumatic pressure is reasonable or not by the mode, verifies the design structure of the front cabin cover assembly, fills the blank that the design verification of the front cabin cover assembly is not carried out in the prior art, improves the use safety of the front cabin cover assembly, and has great popularization value.
The test bed fixes the front cabin cover assembly, can simulate aerodynamic force acting on an outer plate of the automobile front cabin cover assembly and reaction force acting on a lock hook of the automobile front cabin cover assembly, is provided with a heating device for simulating the thermal environment of certain automobile front cabins (typically, vehicles with a front internal combustion engine) in a test, can reflect the real use condition of the front cabin cover assembly, and has more accurate verification result.
The method realizes the verification of the connection strength of the automobile front cabin cover assembly through the constraint relation, is based on simulation analysis and physical verification, takes simulation and physical test benchmarking as means, realizes the unification of simulation and physical test boundaries, and identifies the reliability of the physical test bench in the benchmarking process, including the loading speed, whether the loading process is uniform or stable, whether the loading related tool and fixture can meet the requirements or not, whether the modification of the bench and the investment of equipment are needed or not, and finally obtains the stable and high-precision physical test method and the bench.
Drawings
FIG. 1: the structure of one side of the inner plate of the front cabin cover assembly of the embodiment is schematically shown;
FIG. 2: the side structure schematic diagram of the front cabin cover assembly of the embodiment;
FIG. 3: the schematic structural diagram of the front cabin cover assembly testing device of the embodiment;
wherein: 1-a front hatch cover assembly; 2, a hinge; 3, locking a hook; 4-auxiliary support; 5, servo push-pull machine; 6, fixing a heater bracket; 7-a heater; and 8, a temperature centralized controller.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
The pneumatic pressure connection strength of a front cabin cover assembly 1 of a certain vehicle type is verified at present, the front cabin cover assembly structure of the embodiment is shown in fig. 1-2, the front cabin cover assembly 1 is formed by combining an inner plate and an outer plate, and is connected with a vehicle body through a hinge 2. The front cabin cover assembly 1 is erected, one end, away from a cockpit, of the front cabin cover assembly 1 is supported on the ground, the width of the front cabin cover assembly 1 is 1509.6mm, the height of the front cabin cover assembly 1 is 1273.5mm, an outer plate and an inner plate are fixedly adhered into a whole in a gluing mode, the height of a gluing area from the ground is 517.9mm, the width of the gluing area is 1085.6mm, and the height of the gluing area is 468.2 mm.
In the embodiment, the verification calculation is performed on the front cabin cover assembly 1, and the verification method is performed according to the following steps:
the first step is as follows: the pneumatic pressure strength borne by the front cabin cover assembly 1 in actual use is directly proportional to the driving speed of the automobile, and in this embodiment, to verify the connection strength of the front cabin cover assembly 1, the maximum pneumatic pressure capable of being borne by the front cabin cover assembly 1 needs to be measured and calculated, so that the pneumatic pressure borne by the front cabin cover assembly 1 at the highest driving speed of the automobile needs to be simulated in this embodiment. Simulating the maximum air flow acting force applied to the front cabin cover assembly 1 when the car runs at 160km/h and meets a truck with the car speed of 90km/h in the Fluent software, wherein the pneumatic pressure applied to the front cabin cover assembly 1 by air flows in different directions is found by simulation at different angles, the pneumatic pressure applied to the front cabin cover assembly 1 when facing the air flow flowing along the X direction relative to the car is relatively large, and the pneumatic pressure applied to the front cabin cover assembly 1 is maximum when the air flow direction forms an angle of 10 degrees with an XZ plane (the X direction refers to the front and rear direction of the car, i.e. the up and down direction in fig. 2, the Y direction is the left and right direction of the car, i.e. the front and rear direction perpendicular to the paper of fig. 2, the Z direction is the up and down direction of the car, i.e. the left and right direction in fig. 2) of the front cabin cover assembly 1, deriving the pressure value borne by the front cabin cover assembly 1 in the direction, and taking the pressure value as the maximum theoretical pneumatic pressure borne by the front cabin cover assembly 1, namely FFluid, especially for a motor vehicle。
The second step is that: since the mesh of the fluid is different from the mesh type of the structure, the pressure value of the hood derived from the fluid software needs to be converted, and the embodiment first calculates the pressure on the fluid mesh by the following formula:
Pstatic＝CP*(ρν^2/2)
wherein: pstic-fluid grid pressure;
CP-a pressure coefficient;
ρ is air density;
v-fluid velocity
The method comprises the steps of mapping pressure under a fluid grid of a front cabin cover assembly 1 onto a structural grid through Hyperview software, deriving a pressure value after mapping, converting the surface pressure into concentrated force to obtain equivalent surface force due to the fact that the surface pressure cannot be loaded in an experiment, and fitting out equivalent acting force F by means of Hypermesh softwareEquivalence ofThe magnitude, position and force application direction of the force application device, and the F of the front hatch cover assembly 1 of the car of the present embodiment is calculated according to the above calculation methodEquivalence ofIs 816N, FEquivalence ofThe position of application of (X ═ 325, Y ═ 0, Z ═ 673), and FEquivalence ofThe distance between the loading point and the hinge shaft is 789.9mm, the included angle between the installation surface of the movable leaf plate of the hinge 2 (namely the plane represented by the line C of the vertical paper surface in figure 2) and the plumb surface of the fixed leaf plate (namely the plane represented by the line A of the vertical paper surface in figure 2) of the embodiment is 9.8 degrees, and the included angle between the installation surface of the movable leaf plate of the hinge 2 and the plumb surface of the fixed leafEquivalence ofThe direction of the force (i.e., the direction represented by line B in fig. 2) is perpendicular to the plumb plane where the hinged retaining leaf is located.
The third step: extracting the equivalent force FEquivalence ofOf (2), mainly the equivalent force FEquivalence ofThe position of action on the front hatch cover assembly 1 (i.e. the coordinate position of the action force on the front hatch cover assembly 1: X-325, Y-0, Z-673, the distance d of the point of application of force from the plane represented by the axis of rotation of the hinge 2, i.e. the plane perpendicular to the plane of the drawing on line B in fig. 2, is 789.9mm) and the direction of action (the direction of application of force: perpendicular to the plumb plane where the hinge-holding leaf is located, i.e. in the direction represented by the line B in fig. 2, as shown by F in fig. 2)Equivalence of) Then, the information is marked on the front cabin cover assembly 1, and the subsequent test is carried out on the front cabin cover according to the action informationThe cover assembly 1 applies a force.
The fourth step: the preliminary preparation of the test, as shown in fig. 3, is a test device of the front cabin cover assembly 1 of this embodiment, and the test device includes an auxiliary bracket 4 for fixing the front cabin cover assembly 1, a hinge 2 at the lower end of the front cabin cover assembly 1 is fixed at the bottom of the auxiliary bracket, and a latch hook 3 at one side of an inner plate is fixed by a rigid latch hook pull rod, so as to simulate the connection of the front cabin cover assembly 1 and an engine cabin. One side of the outer plate is connected with a servo push-pull machine 5 through a rigid outer plate pull rod, and acting force is applied to the outer plate of the front cabin cover assembly 1 through the servo push-pull machine 5.
In order to completely simulate the use environment of the front cabin cover assembly 1, in the embodiment, a heater fixing support 6 is added on an auxiliary support 4 on one side of an inner plate of the front cabin cover assembly 1, a heater 7 is installed on the heater fixing support 6, the heating condition of an engine when the front cabin cover assembly 1 is actually used is simulated by heating through the heater 7, and the heater 7 of the embodiment heats the inner plate of the front cabin cover assembly 1 to 100 ℃.
In addition, in order to monitor the temperature condition of the front cabin cover assembly 1 in real time, the present embodiment needs to install a temperature sensor on the inner panel of the front cabin cover assembly 1, and the temperature sensor is mainly installed in the glue coating area on one side of the inner panel, especially the glue coating weak position on the inner panel. The temperature sensor is in data communication with a temperature centralized controller 8 on the auxiliary support through a wire harness, and the temperature change of the front cabin cover assembly 1 is monitored in real time through the temperature centralized controller 8.
The experimental preparation of subjects included: 1. confirming representativeness of a test sample piece of the front cabin cover assembly 1, wherein the representativeness comprises standard size, glue coating, welding spots, fastening torque and the like;
2. arranging at least four temperature sensors at weak positions of a gluing area of the front cabin cover assembly 1, wherein the arrangement positions are on the surface of an inner plate of the front cabin cover assembly 1 and are as close to the acting force position of an outer plate pull rod as possible;
3. according to the calculated equivalent force FEquivalence ofIs arranged in a constraint manner according to the calculated FEquivalence ofThe connection points, i.e. the outer panel tie rods, are arranged in the functional position of the front hatch cover assembly 1Fixedly connected to the outer panel at a connection position FEquivalence ofThen the force application direction of the outer plate pull rod is adjusted to ensure the force application direction of the outer plate pull rod and FEquivalence ofThe force transmission directions of the front cabin cover assembly and the engine cabin cover assembly are the same, corresponding traction acting force is arranged on a lock hook pull rod, the connection mode of a lock hook 3 of the front cabin cover assembly 1 and the engine cabin is simulated, and the rest restraint is equivalent to the original vehicle environment;
4. a heater is arranged on the test bench and the test piece of the front hatch cover assembly 1 is heated until the required temperature is reached steadily (the heating temperature in this embodiment is 100 ℃).
The fifth step: acting force F begins to be loaded to input signal of servo push-pull machine1Applied force F1The loading is carried out in a regular way, generally, the loading is gradually carried out from small to large, and the loading speed is 0.5 mm/s. In the loading process, the condition of the front cabin cover assembly 1 is observed, when the separation between the inner plate and the outer plate of the front cabin cover assembly 1 is observed or the front cabin cover assembly 1 is obviously yielded, the loading is stopped, the separation position of the front cabin cover assembly 1 or the position where the front cabin cover assembly 1 is obviously deformed is marked, the marked position is the position where the inner plate and the outer plate on the front cabin cover assembly 1 are easy to separate or the position where the structural strength is weak, and the positions are the places needing to be improved. And recording the pressure value F borne by the front cabin cover assembly 1 when the inner plate and the outer plate of the front cabin cover assembly 1 are separated or the front cabin cover assembly 1 is obviously deformedPulling-off type. Experimental observation shows that the test piece of the front cabin cover assembly 1 of the embodiment is F1When the pressure exceeds 1200N, the front cabin cover assembly 1 yields, and the acting force cannot be loaded continuously, namely F of the sample piece of the front cabin cover assembly 1 of the embodimentPulling-off typeIs 1200N.
And a sixth step: after the test is finished, summarizing the phenomena observed in the test and outputting F1Force versus displacement or time. Analysis of the force value F at pull-off or yieldPulling-off typeWhether the requirements are met or not is met for the front hatch cover assembly 1. Comparative example FEquivalence ofF, 816N, calculated according to this examplePulling-off type1200N, clear FPulling-off typeGreater than FEquivalence ofThe front cowl of the present embodiment is provedThe actual use strength of the cover assembly 1 is greater than the theoretical strength, and the structural strength of the front cabin cover assembly 1 of the present embodiment satisfies the actual requirements.
If F appearsPulling-off typeIs less than or equal to FEquivalence ofIf the structural strength of the front cabin cover assembly 1 does not meet the actual use requirement, the structural design needs to be returned again for checking and confirmation.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A method for verifying the pneumatic pressure connection strength of an automobile front cabin cover assembly is characterized by comprising the following steps: calculating the maximum air flow acting force F of the front cabin cover assembly in the running process of the automobileFluid, especially for a motor vehicle(ii) a F is to beFluid, especially for a motor vehicleConverted into equivalent acting force F which can be applied to the front cabin cover assembly on the test equipmentEquivalence of(ii) a Extracting the equivalent force FEquivalence ofRole information of (1); arranging a use environment conforming to the front cabin cover assembly on a test bed, and then applying equivalent acting force F to the front cabin cover assemblyEquivalence ofActing force F with identical acting information1(ii) a And observing the state of the front cabin cover assembly under the stress action, and judging whether the structural design is reliable or not according to the test result.
2. The method for verifying the pneumatic pressure connection strength of the automobile front cabin cover assembly according to claim 1, wherein the method comprises the following steps: calculating the maximum air flow acting force F of the front cabin cover assembly in the running process of the automobileFluid, especially for a motor vehicleThe method comprises the following steps: under the condition of simulating the highest vehicle speed in Fluent software, the pressure values born by the front cabin cover assembly under the action of wind directions at different angles are led outThe maximum pressure value of the cabin cover assembly is used as the fluid acting force F on the front cabin cover assembly in the running process of the automobileFluid, especially for a motor vehicle。
3. The method for verifying the pneumatic pressure connection strength of the automobile front cabin cover assembly according to claim 1, wherein the method comprises the following steps: the first part isFluid, especially for a motor vehicleConverted into equivalent acting force F which can be applied to the front cabin cover assembly on the test equipmentEquivalence ofThe method comprises the following steps: the front cabin cover assembly is equivalent to a grid-shaped structure through Hyperview software, and the fluid acting force F is converted into the force FFluid, especially for a motor vehicleMapping to equivalent grid, deriving the mapped pressure value, and converting the surface pressure acting on the front cabin cover assembly into point pressure acting on the front cabin cover assembly, i.e. equivalent acting force FEquivalence of。
4. The method for verifying the pneumatic pressure connection strength of the automobile front cabin cover assembly according to claim 1, wherein the method comprises the following steps: said equivalent force FEquivalence ofThe effect information of (1) includes FEquivalence ofThe position and direction of action of.
5. The method for verifying the pneumatic pressure connection strength of the automobile front cabin cover assembly according to claim 1, wherein the method comprises the following steps: the method for arranging the service environment conforming to the front cabin cover assembly on the test bed comprises the following steps: and (3) heating the test bed to be not less than 100 ℃, and simulating the heating condition of the engine compartment when the front compartment cover assembly is actually used.
6. The method for verifying the pneumatic pressure connection strength of the automobile front cabin cover assembly according to claim 1, wherein the method comprises the following steps: the front cabin cover assembly is applied with an equivalent acting force FEquivalence ofActing force F with identical acting information1The method comprises the following steps: according to equivalent force FEquivalence ofThe front cabin cover assembly is loaded with acting force F at the same position and in the same direction1Simulating the pneumatic pressure of the front cabin cover assembly in the driving process from small to smallLarge gradual loading until F1And increasing to the design requirement value.
7. The method for verifying the pneumatic pressure connection strength of the automobile front cabin cover assembly according to claim 1, wherein the method comprises the following steps: the method for observing the state of the front cabin cover assembly under the stress action comprises the following steps: observing the deformation of the front cabin cover assembly under the action of stress, marking the separation position of the front cabin cover assembly when the separation between the inner plate and the outer plate of the front cabin cover assembly is observed, and recording the pressure value F borne by the front cabin cover assembly when the inner plate and the outer plate of the front cabin cover assembly are separatedPulling-off type。
8. The method for verifying the pneumatic pressure connection strength of the automobile front cabin cover assembly according to claim 7, wherein the method comprises the following steps: the method for judging whether the structural design is reliable according to the test result comprises the following steps: the pressure value F borne by the front cabin cover assembly when the inner plate and the outer plate of the front cabin cover assembly are separatedPulling-off typeWith equivalent force FEquivalence ofMaking comparison if FPulling-off type＞FEquivalence ofThe design strength of the front cabin cover assembly is proved to be reasonable if FPulling-off type≤FEquivalence ofAnd the design strength of the front cabin cover assembly is proved to be unreasonable, and the structural design needs to be returned again for checking and confirmation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113607423A (en) * | 2021-07-16 | 2021-11-05 | 神龙汽车有限公司 | Aircraft hood assembly endurance test method based on aerodynamic fatigue load |
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