A method for optimizing a sub-instrument panel structure and a sub-instrument panel structure

Abstract

The present invention provides an optimization method for a sub-instrument panel structure and a sub-instrument panel structure. The optimization method comprises: S1, performing a simulation test of an impact hammer head hitting the sub-instrument panel, and obtaining a test curve of the acceleration of the impact hammer head changing with time in the simulation test; S2, fitting the test curve to a target curve; the target curve sequentially comprises: a first line segment with constant acceleration, a second line segment with linearly increasing acceleration, and a third line segment with linearly decreasing acceleration; S3, determining a continuous acceleration a according to the target curve. t Calculation formula for continuous acceleration a t is the minimum value of the acceleration within the preset time period of the target curve, wherein the starting time of the preset time period is located in the time range corresponding to the second line segment, and the ending time of the preset time period is located in the time range corresponding to the third line segment; S4, if the continuous acceleration a t If the acceleration is greater than the preset threshold, the structure of the sub-dashboard is adjusted so that the continuous acceleration a t Less than or equal to the preset threshold.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobiles, and more specifically, relates to an optimization method for a sub-instrument panel structure and a sub-instrument panel structure. Background Art

[0002] The instrument panel is an assembly in the cab that contains various indicator instruments and ignition switches. The instrument panel is mounted on the instrument panel or as an accessory on the steering column. The sub-instrument panel is usually located in the middle channel of the cab. As one of the automotive interior components, the sub-instrument panel structure needs to meet both strength and energy supply requirements as well as the collision performance requirements in national standards. In the development process of the relevant sub-instrument panel structure, in order to achieve good collision performance, the sub-instrument panel structure needs to be repeatedly optimized during the development stage, which results in low development efficiency and high cost. Summary of the invention

[0003] In view of this, the present invention provides a method for optimizing the structure of a sub-instrument panel to solve the technical problem of how to improve the development efficiency of the sub-instrument panel structure and reduce the cost; the present invention also provides a sub-instrument panel structure to solve the technical problem of how to improve the collision performance of the sub-instrument panel structure.

[0004] The technical solution of the present invention is achieved in this way:

[0005] An embodiment of the present invention provides a method for optimizing a secondary instrument panel structure, comprising:

[0006] S1. Perform a simulation test of an impact hammer hitting a secondary instrument panel, and obtain a test curve of the acceleration of the impact hammer changing with time in the simulation test;

[0007] S2, fitting the test curve to a target curve; the target curve sequentially includes: a first line segment with constant acceleration, a second line segment with linearly increasing acceleration, and a third line segment with linearly decreasing acceleration;

[0008] S3. Determine the continuous acceleration a according to the target curve. t Calculation formula for continuous acceleration a t is the minimum value of the acceleration within a preset time period of the target curve, wherein the starting time of the preset time period is located in the time range corresponding to the second line segment, and the ending time of the preset time period is located in the time range corresponding to the third line segment;

[0009] S4, if the acceleration a continues t If the acceleration a is greater than a preset threshold, the structure of the sub-dashboard is adjusted so that the acceleration a t is less than or equal to the preset threshold.

[0010] In some embodiments, step S2 includes:

[0011] S21, according to the impact process of the impact hammer head hitting the auxiliary instrument panel, decomposing the test curve into three sub-curves connected in sequence;

[0012] S22. Sequentially fit three sub-curves into the first line segment, the second line segment, and the third line segment.

[0013] In some embodiments, three sequentially connected sub-curves are: an acceleration change curve from the first moment when the impact hammer head contacts the outer surface of the auxiliary instrument panel to the second moment when it encounters the structural hard point of the auxiliary instrument panel, an acceleration change curve from the second moment to the third moment when the acceleration reaches a maximum value, and an acceleration change curve from the third moment to the fourth moment when the velocity is zero.

[0014] In some embodiments, the acceleration value corresponding to the first line segment is the acceleration value of the impact hammer at the first moment.

[0015] In some embodiments, step S3 includes:

[0016] S31, obtaining a translation line segment parallel to the time axis according to the size of the preset time period;

[0017] S32, moving the translation line segment until both ends of the translation line segment intersect with the second line segment and the third line segment respectively, and the times corresponding to the two intersection points are the start time and the end time of the preset time respectively;

[0018] S32, calculating the velocity variation curve of the corresponding impact hammer head over time according to the target curve;

[0019] S34, determine the continuous acceleration a t The calculation formula is:

[0020]

[0021] Wherein, a1, a2, a3 are the acceleration value at the first moment, the maximum acceleration value and the acceleration value at the fourth moment in the target curve, respectively; v0 is the speed value at the first moment in the speed-time curve; s1, s2, s t , s3 are respectively the displacement values ​​from the first moment to the second moment, the displacement from the second moment to the starting moment of the preset time period, the displacement of the preset time period, and the displacement from the end moment of the preset time period to the fourth moment obtained according to the speed change curve over time.

[0022] In some embodiments, step S4 includes adjusting the structure of the secondary instrument panel to satisfy at least one of the following conditions:

[0023] Increase the acceleration value a1 at the first moment and make a1 less than or equal to 72g;

[0024] Increase the displacement s1 from the first moment to the second moment;

[0025] Increase the maximum acceleration value a2 and make a2 less than or equal to 120g;

[0026] Increase the displacement from the second moment to the fourth moment s2+s t +s3.

[0027] An embodiment of the present invention further provides a sub-instrument panel structure obtained according to any one of the above optimization methods, including:

[0028] ontology;

[0029] A storage box is arranged in the body, and one end of the storage box is provided with an opening communicating with the outside of the body;

[0030] an armrest movably connected to the body via a hinge mechanism to open and close the opening;

[0031] The first end of the armrest is used to receive the impact of the impact hammer, and the end of the hinge mechanism connected to the armrest is spaced apart from the first end by a set distance.

[0032] In some embodiments, the set distance is 0.2 to 0.5 times the length of the handrail.

[0033] In some embodiments, the hinge mechanism comprises:

[0034] A fixed arm, one end of which is fixedly connected to the body;

[0035] The movable arm has one end rotatably connected to the other end of the fixed arm, and the other end fixedly connected to the armrest.

[0036] In some embodiments, the secondary instrument panel structure further includes:

[0037] A support member extends from the other end of the movable arm to the first end of the armrest, and the support member is an arc-shaped structure.

[0038] In some embodiments, the secondary instrument panel structure further includes:

[0039] A bracket, used to fix the body to the outside; wherein the bracket includes:

[0040] A connecting portion extending in a horizontal direction;

[0041] A front leg of the bracket connected to one side of the connecting portion;

[0042] A rear leg of the bracket connected to the other side of the connecting portion;

[0043] Wherein, the front leg of the bracket and the rear leg of the bracket are both configured as bent parts, and the parts of the front leg of the bracket and the rear leg of the bracket close to the connecting part are parallel.

[0044] In some embodiments, the connecting portion is provided with a weakened hole, and the weakened hole passes through two opposite sides of the connecting portion.

[0045] An embodiment of the present invention provides an optimization method for a sub-instrument panel structure and a sub-instrument panel structure. The optimization method includes performing a simulation test of an impact hammer hitting the sub-instrument panel, obtaining a test curve of the acceleration of the impact hammer changing with time, fitting the test curve to a target curve, the target curve including a first line segment with constant acceleration, a second line segment with linearly increasing acceleration, and a third line segment with linearly decreasing acceleration, determining a calculation formula for continuous acceleration based on the target curve, and if the continuous acceleration is greater than a preset threshold, adjusting the structure of the sub-instrument panel so that the continuous acceleration is less than or equal to the preset threshold. The embodiment of the present invention truly simulates the collision process of the sub-instrument panel structure by fitting the test curve to a target curve of the first line segment, the second line segment, and the third line segment, and decomposes the collision process of the sub-instrument panel structure to utilize the continuous acceleration a t The calculation formula is used to adjust the structure of the auxiliary instrument panel, which optimizes the efficiency of the auxiliary instrument panel design, eliminates the need for repeated experiments, and reduces the development cost of the auxiliary instrument panel structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A flowchart of the steps of the method for optimizing the structure of the auxiliary instrument panel according to an embodiment of the present invention;

[0047] Figure 2 is a rear view of the relevant auxiliary instrument panel structure;

[0048] Figure 3 for Figure 2 Middle AA section view;

[0049] Figure 4 It is the test curve of the acceleration of the impact hammer changing with time;

[0050] Figure 5 is the target curve of the acceleration of the impact hammer changing with time;

[0051] Figure 6 The target curve of the impact hammer head velocity changing with time;

[0052] Figure 7 A flowchart of the steps of a method for optimizing the structure of a secondary instrument panel according to an embodiment of the present invention;

[0053] Figure 8A flowchart of the steps of a method for optimizing the structure of a secondary instrument panel according to another embodiment of the present invention;

[0054] Fig. 9 A three-dimensional diagram of a secondary instrument panel structure according to an embodiment of the present invention;

[0055] Fig.10 A rear view of the auxiliary instrument panel structure according to an embodiment of the present invention;

[0056] Fig.11 for Fig.10 Cross-sectional view of the middle BB part;

[0057] Fig.12 It is a schematic diagram of the connection between the support member and the movable arm according to an embodiment of the present invention;

[0058] Fig.13 is a three-dimensional diagram of a bracket according to an embodiment of the present invention;

[0059] Fig.14 It is a side view of the bracket according to the embodiment of the present invention.

[0060] Description of reference numerals:

[0061] a. first collision point; b. second collision point; c. third collision point; m. impact hammer head; d. first line segment; e. second line segment; f. third line segment; 1. main body; 2. storage box; 21. opening; 3. armrest; 31. first end; 4. hinge mechanism; 41. fixed arm; 42. movable arm; 421. first arm; 422. second arm; 423. third arm; 5. support member; 6. bracket; 61. connecting part; 62. front leg of bracket; 63. rear leg of bracket; 64. weakened hole; 7. middle bracket; 8. rear bracket. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0063] The various specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction, for example, different embodiments and technical solutions can be formed by combining different specific technical features. In order to avoid unnecessary repetition, various possible combinations of the specific technical features in the present invention will not be described separately.

[0064] In the following description, the terms "first\second\..." are only used to distinguish different objects, and do not mean that the objects have the same or related points. It should be understood that the directions "above", "below", "outside" and "inside" are all directions in normal use, and the directions "left" and "right" refer to the left and right directions shown in the corresponding schematic diagrams, which may or may not be the left and right directions in normal use.

[0065] It should be noted that the terms "comprises", "includes" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0066] An embodiment of the present invention provides an optimization method for a sub-instrument panel structure. It should be noted that the sub-instrument panel structure is one of the components of the automobile interior that can directly contact the occupants. During the process of sudden braking or collision of the vehicle, the occupants may collide with the sub-instrument panel structure. In order to reduce the injuries suffered by the occupants during the collision, the design of the sub-instrument panel structure, in addition to meeting the strength requirements, also needs to meet the standard GB11552-2009 "Requirements for Protrusions inside Passenger Cars".

[0067] like Figure 1 As shown, the optimization method of the auxiliary instrument panel structure provided by the embodiment of the present invention includes:

[0068] S1. Conduct a simulation test of an impact hammer hitting a secondary instrument panel, and obtain a test curve of the acceleration of the impact hammer changing with time in the simulation test. In the embodiment of the present invention, a finite element model of the secondary instrument panel structure is pre-established. Figure 2 The rear view of the finite element model of the auxiliary instrument panel structure is shown. Figure 2 As shown, it is possible to Figure 2 The collision simulation is performed on one or more collision points among the first collision point a, the second collision point b and the third collision point c in the auxiliary instrument panel to obtain data of the collision simulation process. The collision point is located at the end of the armrest 3 in the auxiliary instrument panel. Figure 3 The side view of the initial finite element model of the auxiliary instrument panel structure is shown, combined with Figure 3As shown, the above collision simulation can use a rigid body to simulate the impact hammer m, for example, the head hits a steel ball, and the impact direction of the head hitting the steel ball is the tangent direction of the ball center motion trajectory, and the motion trajectory of the head hitting the steel ball can be determined by the contact position between the head hitting the steel ball and the collision point. In the embodiment of the present invention, the impact hammer m is used to impact the collision point (one or more of the first collision point a, the second collision point b and the third collision point c) on the finite element model of the auxiliary instrument panel structure to obtain a test curve of the acceleration of the impact hammer m changing with time, and the acceleration can be the acceleration of the ball center of the impact hammer m.

[0069] S2, fitting the test curve to the target curve; Figure 4 is the test curve of the acceleration of the impact hammer m changing with time, where the solid line represents the test curve of the acceleration changing with time obtained when the impact hammer m hits the finite element model of the initial auxiliary instrument panel structure; the dotted line represents the test curve of the acceleration changing with time obtained when the impact hammer m hits the finite element model of the optimized auxiliary instrument panel structure. Figure 4 The horizontal axis represents time, and the vertical axis represents the acceleration of the impact hammer m, see Figure 4 The solid line test curve in the middle, the steps of the embodiment of the present invention fit the solid line test curve into a target curve. It should be noted that the target curve in the embodiment of the present invention includes a target curve of acceleration changing with time and a target curve of displacement changing with time, wherein the target curve of displacement changing with time can be obtained by fitting the target curve of acceleration changing with time. Figure 5 The figure shows the target curve of acceleration changing with time, which is fitted based on the test curve. Figure 6 The target curve of displacement changing with time is shown in FIG. Figure 5 As shown, the target curve of acceleration changing with time includes, in sequence: a first line segment d with constant acceleration, a second line segment e with linearly increasing acceleration, and a third line segment f with linearly decreasing acceleration.

[0070] like Figure 5 As shown, step S3 determines the continuous acceleration a according to the target curve. t Calculation formula for continuous acceleration a t is the minimum value of the acceleration within the preset time period of the target curve. The starting time of the preset time period is within the time range corresponding to the second line segment, and the ending time of the preset time period is within the time range corresponding to the third line segment. According to GB11552-2009 "Requirements for Protrusions in Passenger Car Interiors" as the basic requirement for vehicles to enter the market, the preset time period is defined as 3ms, and the acceleration within the preset time period in the target curve represents the acceleration that exceeds the target acceleration.

[0071] S4, if the acceleration a continues tIf the acceleration is greater than the preset threshold, the structure of the sub-dashboard is adjusted so that the continuous acceleration a t It should be noted that according to GB11552-2009 "Requirements for Protrusions in Passenger Car Interiors" as the basic requirement for vehicles to enter the market, the duration of the deceleration of the impact hammer head exceeding 80g during the collision with the auxiliary instrument panel does not exceed 3ms. The continuous acceleration a in the embodiment of the present invention is t The value is set to 72g, so that the simulation experiment retains a 10% safety margin. Wherein, g represents the acceleration due to gravity. The embodiment of the present invention uses a continuous acceleration t The calculation formula is used to adjust the structure of the auxiliary instrument panel so that the continuous acceleration a t Less than or equal to the preset threshold to meet the basic requirements of national standards.

[0072] An embodiment of the present invention provides an optimization method for a sub-instrument panel structure, including conducting a simulation test of an impact hammer hitting the sub-instrument panel, obtaining a test curve of the acceleration of the impact hammer changing with time, fitting the test curve into a target curve, the target curve including a first line segment with constant acceleration, a second line segment with linearly increasing acceleration, and a third line segment with linearly decreasing acceleration, determining a calculation formula for continuous acceleration according to the target curve, and if the continuous acceleration is greater than a preset threshold, adjusting the structure of the sub-instrument panel so that the continuous acceleration is less than or equal to the preset threshold. The embodiment of the present invention truly simulates the collision process of the sub-instrument panel structure by fitting the test curve into a target curve of the first line segment, the second line segment, and the third line segment, and decomposes the collision process of the sub-instrument panel structure to utilize the continuous acceleration a t The calculation formula is used to adjust the structure of the auxiliary instrument panel, which optimizes the efficiency of the auxiliary instrument panel design, eliminates the need for repeated experiments, and reduces the development cost of the auxiliary instrument panel mechanism.

[0073] In some embodiments, Figure 7 As shown, step S2 includes:

[0074] Step S21, according to the impact process of the impact hammer head hitting the auxiliary instrument panel, decomposing the test curve into three sub-curves connected in sequence;

[0075] Step S22: sequentially fit the three sub-curves into a first line segment, a second line segment, and a third line segment.

[0076] Combination Figure 4In the embodiment of the present invention, the fitting of the first line segment d may correspond to the fluctuation range of the acceleration in the test curve within a certain period of time being less than the set value, and the average value of the acceleration in the time period may be taken as the acceleration of the first line segment d in the target curve. The fitting of the second line segment e corresponds to the trend change of the acceleration in the test curve showing a linear increase, and the curve within the time range is fitted into a straight line segment, and the slope of the straight line segment is defined as the rate of change of the acceleration of the second line segment e. The fitting of the third line segment f corresponds to the trend change of the acceleration in the test curve showing a linear decrease, and the curve within the time range is fitted into a straight line segment, and the slope of the straight line segment is defined as the rate of change of the acceleration of the third line segment f.

[0077] In some embodiments, Figure 4 As shown, combined with the structure of the initial finite element model of the auxiliary instrument panel structure, the process of the impact hammer hitting the auxiliary instrument panel is analyzed, and the process of the impact hammer hitting the auxiliary instrument panel is decomposed into three sub-processes, each of which corresponds to a sub-curve. The three sequentially connected sub-curves include an acceleration change curve from the first moment when the impact hammer contacts the outer surface of the auxiliary instrument panel to the second moment when it encounters the structural hard point of the auxiliary instrument panel, an acceleration change curve from the second moment to the third moment when the acceleration reaches the maximum value, and an acceleration change curve from the third moment to the fourth moment when the velocity is zero. In the process from the first moment to the second moment, the impact hammer head contacts the outer surface of the auxiliary instrument panel at the first moment, and the acceleration of the impact hammer head reaches a1 in a short time. The impact hammer head is limited by the energy absorption space in the auxiliary instrument panel and squeezes the armrest; at the second moment, the impact hammer head contacts the structural hard point of the auxiliary instrument panel, so that the impact hammer head is supported by the auxiliary instrument panel for the second time, so that the acceleration of the impact hammer head between the second moment and the third moment increases; at the third moment, the overall structure of the auxiliary instrument panel collapses, and the acceleration of the impact hammer head reaches the maximum value a2; from the third moment to the fourth moment, the overall structure of the auxiliary instrument panel collapses, and the supporting force of the impact hammer head decreases, causing the acceleration to decrease. At the fourth moment, the speed of the impact hammer head drops to 0m / s. Subsequently, the impact hammer head rebounds and changes its direction of movement. The impact hammer head moves away from the auxiliary instrument panel and finally breaks away from the contact with the auxiliary instrument panel. The embodiment of the present invention decomposes the test curve into three sub-curves according to the structural characteristics of the auxiliary instrument panel, and fits the target curve of the acceleration of the impact hammer head changing with time according to the movement law of the impact hammer head in the three stages. Combined with Figure 5 As shown, Figure 5 Among them, t1 represents the time period from the first moment to the second moment; t2 represents the time from the second moment to the time when the acceleration reaches the continuous acceleration; T represents the preset time period when the acceleration is greater than the continuous acceleration; t3 represents the time period from the acceleration being less than the continuous acceleration to the time when the impact hammer speed is reduced to 0.

[0078] It should be noted that the acceleration described in the embodiments of the present invention and the acceleration in the accompanying drawings all represent the absolute value of the acceleration, that is, in the process from the first moment to the fourth moment, the direction of the acceleration described is opposite to the direction of the speed. The acceleration is actually a deceleration, and the impact hammer head decelerates after contacting the auxiliary instrument panel structure.

[0079] The embodiment of the present invention utilizes the characteristics of the auxiliary instrument panel structure to decompose the process of the impact hammer hitting the auxiliary instrument panel into three parts, so as to fit the target curve by dividing the test curve obtained by simulation. The simulation method is closer to the real collision test, which is beneficial to improving the accuracy of the auxiliary instrument panel structure optimization.

[0080] In some embodiments, the acceleration value corresponding to the first line segment is the acceleration value of the impact hammer at the first moment. In the embodiment of the present invention, the acceleration at the first moment when the impact hammer contacts the auxiliary instrument panel structure is fitted to the acceleration value of the first line segment. During the impact process of the first line segment, the impact hammer squeezes the handrail. The area where the impact hammer squeezes the handrail to the hard point of the structure is defined as the energy absorption space. The resistance of the energy absorption space is approximately constant, so the acceleration of the first line segment is defined as the acceleration at the first moment.

[0081] In some embodiments, Figure 8 As shown, step S3 includes:

[0082] S31, obtaining a translation line segment parallel to the time axis according to the size of the preset time period T;

[0083] S32, moving the translation line segment until both ends of the translation line segment intersect with the second line segment and the third line segment respectively, and the times corresponding to the two intersection points are the start time and the end time of the preset time respectively;

[0084] S32, calculating the velocity variation curve of the corresponding impact hammer head over time according to the target curve;

[0085] S34, determine the continuous acceleration a t The calculation formula is:

[0086]

[0087] Among them, a1, a2, a3 are the acceleration value at the first moment, the maximum acceleration value and the acceleration value at the fourth moment in the target curve, v0 is the speed value at the first moment in the speed-time curve, s1, s2, s t , s3 are the displacement values ​​from the first moment to the second moment, the displacement from the second moment to the start moment of the preset time period, the displacement of the preset time period, and the displacement from the end moment of the preset time period to the fourth moment, respectively, obtained according to the speed-time curve.

[0088] Combination Figure 6 As shown in the figure, the displacement of the point in the speed-time curve can be expressed by the area enclosed by the speed and time, and the displacement of each period can be used to represent the energy absorption space of the auxiliary instrument panel structure. Among them, s1 can be used to represent the energy absorption space inside the armrest; s2+s t +s3 is the sum of the energy absorption space inside the auxiliary instrument panel and the energy absorption space between the auxiliary instrument panel and the floor. Figure 6 Where t1 represents the time period from the first moment to the second moment; t2 represents the time from the second moment to the acceleration reaching the continuous acceleration; T represents the preset time period when the acceleration is greater than the continuous acceleration; t3 represents the time period from the acceleration being less than the continuous acceleration to the time when the impact hammer speed is reduced to 0. Using the area calculation method, the corresponding derivation can be obtained. Figure 6 The displacement s within the preset time period T t , and derive the continuous acceleration a t The calculation formula for .

[0089] In the embodiment of the present invention, the preset time period is 3 ms, and the translation line segment is parallel to the time axis ( Figure 5 The line segment with a length of 3ms on the horizontal axis is moved so that the two ends of the translation line segment intersect with the second line segment and the third line segment respectively, and the acceleration values ​​corresponding to the two ends of the translation line segment are equal. In other words, the accelerations of the two intersection points are equal.

[0090] In some embodiments, according to the continuous acceleration a t The calculation formula can be used to obtain the relationship between the acceleration and energy absorption space at each stage. When the continuous acceleration of the finite element model of the simulated auxiliary instrument panel structure does not meet the requirement of less than or equal to 72g, according to the continuous acceleration a t The calculation formula can be used to achieve continuous acceleration a by increasing the acceleration and displacement at each stage. t The sub-dashboard structure needs to increase the rigidity and energy absorption space of each area.

[0091] Step S4 includes adjusting the structure of the secondary instrument panel to satisfy at least one of the following conditions:

[0092] Increase the acceleration value a1 at the first moment and make a1 less than or equal to 72g. t The calculation formula shows that when the acceleration value a1 at the first moment increases, the continuous acceleration a t In the actual structure of the auxiliary instrument panel, the stiffness of the armrest, that is, the stiffness of the impact point where the impact hammer head contacts the armrest, can be increased to increase the acceleration value a1 at the first moment.

[0093] Increase the displacement s1 from the first moment to the second moment. According to the continuous acceleration at The calculation formula shows that the continuous acceleration a can be reduced by increasing the displacement s1 from the first moment to the second moment. t That is to say, the distance from the initial position where the impact hammer head contacts the handrail to the hard point of the structure is increased, thereby increasing the energy absorption space at the handrail position.

[0094] Increase the maximum acceleration value a2 and make a2 less than or equal to 120g. By increasing the overall stiffness of the auxiliary instrument panel structure to increase the maximum acceleration value a2, a2 ​​in the embodiment of the present invention is less than or equal to 120g, which can reduce the risk of splashing after the surface material is damaged.

[0095] Increase the displacement from the second moment to the fourth moment s2+s t +s3. By increasing the energy absorption space inside the auxiliary instrument panel structure and the energy absorption space between the auxiliary instrument panel and the floor, it is helpful to reduce the continuous acceleration a t It should be noted that the floor refers to the floor of the car connected to the auxiliary instrument panel structure.

[0096] like Fig. 9 As shown, an embodiment of the present invention further provides a sub-instrument panel structure obtained according to any of the above-mentioned optimization methods, and the sub-instrument panel structure includes a main body 1, a storage box 2 and an armrest 3. The main body 1 can serve as a support for the entire sub-instrument panel structure. The storage box 2 is arranged in the main body 1. In some embodiments, the storage box 2 can be integrally formed with the main body 1. One end (Figure) of the storage box 2 is provided with an opening 21 connected to the outside of the main body 1. The armrest 3 is movably connected to the main body 1 through a hinge mechanism 4 to open and close the opening 21. It should be noted that the embodiment of the present invention does not limit the movement mode between the armrest 3 and the main body 1, that is, the armrest 3 can rotate relative to the main body 1, the armrest 3 can also move horizontally relative to the main body 1, and of course, the armrest 3 can also move horizontally and rotate relative to the main body 1, so as to achieve the closing and opening of the opening 21 by the armrest 3. Fig. 9 In the state shown, the armrest 3 is located at the position of closing the opening 21, and the storage box 2 can be used to store items. When the armrest 3 opens the opening 21 of the storage box 2, the user can place the items to be stored into the storage box 2 from the opening 21, and then use the armrest 3 to close the opening 21, so that the items in the storage box 2 are not easy to slide out of the storage box 2.

[0097] In the embodiment of the present invention, the first end 31 ( Fig. 9 The right end in the x direction shown in the figure is used to receive the impact of the impact hammer head. Fig.10 and Fig.11 As shown, one end of the hinge mechanism 4 connected to the armrest 3 ( Fig.11The left end shown in the figure is spaced apart from the first end 31 by a set distance L1. It should be noted that the set interval distance means that the end of the hinge mechanism 4 connected to the armrest 3 is not close to the first end 31, but is spaced apart from the first end 31, wherein the vicinity of the end of the hinge structure connected to the armrest can be regarded as the structural hard point of the entire sub-instrument panel structure, and the structural hard point is spaced apart from the first end so that the structural hard point is away from the first end, and the area between the structural hard point and the first end can be regarded as the energy absorption space of the sub-instrument panel structure, and the structural hard point is spaced apart from the first end to increase the energy absorption space of the sub-instrument panel structure, thereby increasing the displacement s1 from the first moment to the second moment, according to the continuous acceleration a t The calculation formula can be deduced that the energy absorption space of the auxiliary instrument panel structure is large, and the corresponding continuous acceleration a t Small, so that the continuous acceleration a of the auxiliary instrument panel structure t Able to meet standard requirements.

[0098] In some embodiments, Fig.11 As shown, the set distance L1 is 0.2 to 0.5 times the length L2 of the armrest 3. By limiting the ratio of the set distance to the armrest length, the embodiment of the present invention can increase the energy absorption space between the first end 31 of the armrest 3 and the structural hard point, and can also maintain a certain rigidity of the armrest, which is beneficial to the transmission of the hinge mechanism 4.

[0099] In some embodiments, Fig.11 As shown, the hinge mechanism 4 includes a fixed arm 41 and a movable arm 42. One end of the fixed arm 41 ( Fig.11 The movable arm 42 is rotatably connected to the other end of the fixed arm 41, and the other end of the movable arm 42 is fixedly connected to the armrest 3. The movable arm 42 can rotate relative to the fixed arm 41, thereby driving the armrest 3 to rotate relative to the body 1 around the connection point between the movable arm 42 and the fixed arm 41. In this way, the armrest 3 can open or close the opening 21.

[0100] In the embodiment of the present invention, combined with Fig.11 and Fig.12 As shown, the movable arm 42 includes a first arm 421, a second arm 422 and a third arm 423. The first arm 421 extends in the horizontal direction ( Fig.11 The horizontal direction represents the horizontal direction of the auxiliary instrument panel structure in normal use, and the first arm 421 is fixedly connected to the armrest 3. One end of the second arm 422 is connected to the first arm 421, and the second arm 422 is substantially perpendicular to the first arm 421, wherein the position where the second arm 422 is connected to the first arm 421 coincides with the impact point of the simulation test of the impact hammer head hitting the auxiliary instrument panel (that is, Fig.11The first arm 421 is opposite to the first arm 31 shown in the figure, so the position where the second arm 422 is connected to the first arm 421 forms a structural hard point that hits the auxiliary instrument panel structure. One end of the third arm 423 is connected to the other end of the second arm 422, and the other end of the third arm 423 is rotatably connected to the fixed arm 41, and an acute angle is formed between the third arm 423 and the second arm 422. The first arm 421, the second arm 422 and the third arm 423 can be integrally formed.

[0101] In some embodiments, in combination Fig.11 and Fig.12 As shown, the auxiliary instrument panel structure also includes a support member 5. The support member 5 is connected from the other end ( Fig.11 The left end shown in FIG. 1 extends to the first end 31 of the armrest 3. Fig.12 As shown, the support member 5 is an arc-shaped structure. The arc surface of the support member 5 is arranged to fit the inner surface of the first end 31 of the handrail 3. The support member 5 can be set as a sheet metal, and the sheet metal can be a thin metal plate with a thickness of less than 6 mm. In some embodiments, Fig.12 As shown, the first arm 421 of the movable arm 42 is fixedly connected to the support member 5. In the embodiment of the present invention, by setting the support member 5 as a sheet metal, it can support the first end of the handrail, thereby improving the stiffness of the impact hammer head when it first contacts the first end in the simulation test, thereby facilitating the improvement of the continuous acceleration a. t The parameter a1 in the calculation formula is that after the impact hammer hits the first end 31, the energy absorption is achieved through the deformation of the sheet metal (support 5), so that the energy absorption space s1 of the first end of the handrail can be maintained while increasing the contact stiffness, so that the continuous acceleration a t Smaller to meet the requirements.

[0102] In some embodiments, Fig.11 As shown, the auxiliary instrument panel structure further includes a bracket 6. The bracket 6 is used to fix the body 1 to the outside; when the auxiliary instrument panel structure in the embodiment of the present invention is applied to a car, the bracket 6 is used to fix the body 1 to the floor of the car.

[0103] In the embodiment of the present invention, Fig.13 As shown, the bracket 6 includes a connecting portion 61, a bracket front leg 62 and a bracket rear leg 63. The connecting portion 61 is arranged along the horizontal direction ( Fig.13 The extending direction represents the direction of the maximum dimension of the connecting portion 61. The connecting portion 61 extends in the extending direction ( Fig.13 The front leg 62 of the bracket is connected to one side of the connecting portion 61 ( Fig.13 The rear leg 63 of the bracket is connected to the other side of the connecting portion 61 ( Fig.13 to the right in the x direction as shown).

[0104] In the embodiment of the present invention, Fig.14 As shown, the front leg 62 and the rear leg 63 of the support are both configured as bending parts, and the bending parts indicate that the front leg 62 of the support has multiple parts extending in different directions, and the rear leg 63 of the support also has multiple parts extending in different directions. Among them, the parts of the front leg 62 and the rear leg 63 of the support close to the connecting portion 61 are parallel. Parallel means that the parts of the front leg 62 and the rear leg 63 of the support have at least the same extension direction, wherein the extension direction can be parallel to the vertical direction in the absolute coordinate system. The limited parallel in the embodiment of the present invention indicates that the angle between the extension direction of the front leg 62 of the support and the part parallel to the rear leg 63 of the support is not strictly 0 degrees. It can be considered that the angle between the two directions is less than 10 degrees, which is basically parallel, so that the processing and installation errors can be covered. In the embodiment of the present invention, the parts of the front leg 62 and the rear leg 63 of the support close to the connecting portion 61 are bent parallel to the parts away from the connecting portion 61, so as to guide the support to collapse during the collision process and extend the length of the front leg of the support. Combined with the principle of parallelogram, the parallel parts are conducive to the conduction of force, which can guide the deformation of the bracket 6 and make full use of the space under the bracket 6, which is equivalent to increasing the energy absorption space of the auxiliary instrument panel structure.

[0105] In some embodiments, Fig.13 As shown, the connecting portion 61 is provided with a weakened hole 64, and the weakened hole 64 passes through the opposite sides of the connecting portion 61 ( Fig.13 The weakened hole 64 can be arranged on one side of the connecting portion 61 close to the front leg 62 of the bracket, or on one side of the connecting portion 61 close to the rear leg 63 of the bracket, which is beneficial to increase the energy absorption space s2+s t +s3, thereby reducing the continuous acceleration a t .

[0106] In some embodiments, Fig. 9 As shown, the auxiliary instrument panel structure also includes a middle bracket 7 and a rear bracket 8. The middle bracket 7 is used to connect the bracket 6 and the body 1 to strengthen the auxiliary instrument panel structure in the Y direction ( Fig. 9 The rear bracket 8 is used to connect the main body and the bracket 6 to strengthen the auxiliary instrument panel structure in the Y direction ( Fig. 9 Structural rigidity (in the z direction as shown).

[0107] Combination Figure 4 As shown, Figure 4 The solid line in the figure represents the simulation curve of the auxiliary instrument panel structure before optimization, and the dotted line represents the simulation curve of the auxiliary instrument panel structure in the embodiment of the present invention after optimization. Figure 4It can be seen that the simulation curve of the auxiliary instrument panel structure before optimization has a starting time Ts of 3ms of 4.20377s and an ending time Te of 7.20377s. t Reference Figure 4 The Clip parameter in can be obtained, and the continuous acceleration a t The starting time Ts of the simulation curve of the optimized auxiliary instrument panel structure is 4.34033s, and the ending time Te is 7.34033s. Its continuous acceleration a t Reference Figure 4 The Clip parameter in can be obtained, and the continuous acceleration a t is 71.7232g. It can be seen that the optimized continuous acceleration a t It is less than the preset threshold of 72g, so the optimized sub-instrument panel structure meets the standard requirements.

[0108] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A method for optimizing the structure of a secondary instrument panel, characterized in that: include: S1. Perform a simulation test of an impact hammer hitting a secondary instrument panel, and obtain a test curve of the acceleration of the impact hammer changing with time in the simulation test; The acceleration of the impact hammer head is the acceleration of the center of the impact hammer head; S2, fitting the test curve to a target curve; the target curve sequentially includes: a first line segment with constant acceleration, a second line segment with linearly increasing acceleration, and a third line segment with linearly decreasing acceleration; S3. Determine the continuous acceleration a according to the target curve. t Calculation formula for continuous acceleration a t is the minimum value of the acceleration within a preset time period of the target curve, wherein the starting time of the preset time period is located in the time range corresponding to the second line segment, and the ending time of the preset time period is located in the time range corresponding to the third line segment; S4, if the acceleration a continues t If the acceleration is greater than a preset threshold, the structure of the sub-dashboard is adjusted so that the continuous acceleration a t is less than or equal to the preset threshold; Wherein, step S3 comprises: S31, obtaining a translation line segment parallel to the time axis according to the size of the preset time period; S32, moving the translation line segment until both ends of the translation line segment intersect with the second line segment and the third line segment respectively, and the times corresponding to the two intersection points are the start time and the end time of the preset time respectively.

2. The optimization method according to claim 1, characterized in that: Step S2 includes: S21, according to the impact process of the impact hammer head hitting the auxiliary instrument panel, decomposing the test curve into three sub-curves connected in sequence; S22. Sequentially fit three sub-curves into the first line segment, the second line segment, and the third line segment.

3. The optimization method according to claim 2, characterized in that: The three sub-curves connected in sequence are: the acceleration change curve from the first moment when the impact hammer touches the outer surface of the auxiliary instrument panel to the second moment when it encounters the structural hard point of the auxiliary instrument panel, the acceleration change curve from the second moment to the third moment when the acceleration reaches the maximum value, and the acceleration change curve from the third moment to the fourth moment when the speed is zero.

4. The optimization method according to claim 3, characterized in that: The acceleration value corresponding to the first line segment is the acceleration value of the impact hammer at the first moment.

5. The optimization method according to claim 4, characterized in that: Step S3 also includes: S33, calculating the velocity variation curve of the corresponding impact hammer head over time according to the target curve; S34, determine the continuous acceleration a t The calculation formula is: Wherein, a1, a2, a3 are the acceleration value at the first moment, the maximum acceleration value and the acceleration value at the fourth moment in the target curve, respectively; v0 is the speed value at the first moment in the speed-time curve; s1, s2, s t , s3 are respectively the displacement values ​​from the first moment to the second moment, the displacement from the second moment to the starting moment of the preset time period, the displacement of the preset time period, and the displacement from the end moment of the preset time period to the fourth moment obtained according to the speed change curve over time.

6. The optimization method according to claim 5, characterized in that: Step S4 includes adjusting the structure of the secondary instrument panel to meet at least one of the following conditions: Increase the acceleration value a1 at the first moment and make a1 less than or equal to 72g; Increase the displacement s1 from the first moment to the second moment; Increase the maximum acceleration value a2 and make a2 less than or equal to 120g; Increase the displacement from the second moment to the fourth moment s2+s t +s3.

7. A sub-instrument panel structure obtained by the optimization method according to any one of claims 1 to 6, characterized in that: include: ontology; A storage box is arranged in the body, and one end of the storage box is provided with an opening communicating with the outside of the body; an armrest movably connected to the body via a hinge mechanism to open and close the opening; The first end of the armrest is used to receive the impact of the impact hammer, and the end of the hinge mechanism connected to the armrest is spaced apart from the first end by a set distance.

8. The auxiliary instrument panel structure according to claim 7, characterized in that: The set distance is 0.2 to 0.5 times the length of the handrail.

9. The auxiliary instrument panel structure according to claim 7, characterized in that: The hinge mechanism comprises: A fixed arm, one end of which is fixedly connected to the body; The movable arm has one end rotatably connected to the other end of the fixed arm, and the other end fixedly connected to the armrest.

10. The auxiliary instrument panel structure according to claim 9, characterized in that: The secondary instrument panel structure also includes: A support member extends from the other end of the movable arm to the first end of the armrest, and the support member is an arc-shaped structure.

11. The auxiliary instrument panel structure according to claim 10, characterized in that: The secondary instrument panel structure also includes: A bracket, used to fix the body to the outside; wherein the bracket includes: A connecting portion extending in a horizontal direction; A front leg of the bracket connected to one side of the connecting portion; A rear leg of the bracket connected to the other side of the connecting portion; Wherein, the front leg of the bracket and the rear leg of the bracket are both configured as bent parts, and the parts of the front leg of the bracket and the rear leg of the bracket close to the connecting part are parallel.

12. The auxiliary instrument panel structure according to claim 11, characterized in that: The connecting portion is provided with a weakened hole, and the weakened hole passes through two opposite sides of the connecting portion.

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