CN114577489B - Method for determining falling inclination angle and falling height in vehicle falling equivalent test - Google Patents
Method for determining falling inclination angle and falling height in vehicle falling equivalent test Download PDFInfo
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/0078—Shock-testing of vehicles
Abstract
The invention relates to a method for determining a drop inclination angle and a drop height in a vehicle drop equivalent test. The method for determining the falling inclination angle comprises the following steps: determining a vehicle rotation angular acceleration according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle mass center and the distance between the vehicle rear axle and the vehicle mass center; determining a first time according to the vehicle falling speed and the vehicle wheelbase; the first time is the time when the rear axle of the vehicle moves from the initial position to the top end of the falling barrier; determining a second time and a third time according to the falling speed, the falling barrier inclination angle and the falling barrier height of the vehicle; and determining the falling inclination angle according to the vehicle rotation angular acceleration, the first time, the second time and the third time. The method can realize equivalent test of the vehicle drop test, has simple test and small occupied area, does not need to drop barriers, and can rapidly test different drop conditions of different vehicles.
Description
Technical Field
The invention relates to the field of vehicle testing, in particular to a method for determining a drop inclination angle and a drop height in a vehicle drop equivalent test.
Background
Currently, most power battery packs of electric passenger cars are in a slide plate type structure, and power storage batteries are arranged at the bottom of the car. This form of construction brings about certain advantages in terms of vehicle handling, weight saving, freedom of design, etc. At the same time, the vehicle is subjected to impact load in the vertical direction by the battery pack at the bottom when passing over the rough road. Traditional crash safety tests, such as front crash, side crash, tail crash and the like, are all tests on impact load of the battery pack in the horizontal direction, and the complete vehicle safety performance of the electric passenger vehicle cannot be comprehensively tested due to lack of the impact load test in the vertical direction. However, in an actual road traffic environment, when a vehicle passes through a deceleration strip or a road surface with a large drop, an impact load in the vertical direction is generated on the battery pack. For an electric passenger car, a battery pack is a high-risk energy storage component, and serious impact load can possibly damage the mounting structure of the battery pack or an internal structure, so that serious potential safety hazards are brought to the car, and even dangerous situations such as direct firing of the car can be caused.
The method for testing the impact load of the high-voltage battery pack mainly focuses on component level testing at home and abroad, namely, the method for testing the impact load of the high-voltage battery pack is used for testing the high-voltage battery pack independently, such as falling, sliding table impact and the like. For testing of the high-voltage battery pack, a component-level test or a whole-vehicle-level test is adopted, and the component-level test and the whole-vehicle-level test have essential differences in a test method, such as energy aspect of impact and actual use environment aspect of the battery pack. The whole vehicle level test is adopted, so that the overall safety performance of the high-voltage battery pack and the whole vehicle structural arrangement can be reflected on one hand, and the actual service condition of the electric passenger vehicle is more similar on the other hand. Therefore, in order to more comprehensively test the safety of the high-voltage battery pack and the safety of the electric passenger car assembled by the high-voltage battery pack, it is necessary to invent a test method for the whole car drop of the electric passenger car, but most of the existing whole car drop test methods are based on statistical data, and the defects of complex test, large occupied area and the like exist by arranging drop barriers, accelerating the car and further reproducing the drop situation basically consistent with the actual drop situation.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide a method for determining a drop inclination angle and a drop height in a vehicle drop equivalent test, so as to realize the equivalent test of the vehicle drop test, and the method has the advantages of simple test, small occupied area, no need of a drop barrier and capability of rapidly testing different drop working conditions of different vehicles.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for determining a drop inclination angle in a vehicle drop equivalent test, including:
determining a vehicle rotation angular acceleration according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle mass center and the distance between the vehicle rear axle and the vehicle mass center;
determining a first time according to the vehicle falling speed and the vehicle wheelbase; the first time is the time when the rear axle of the vehicle moves from an initial position to the top end of the falling barrier, wherein the initial position is the position where the front axle of the vehicle is positioned when the front axle of the vehicle is positioned at the top end of the falling barrier;
determining a second time and a third time according to the falling speed, the falling barrier inclination angle and the falling barrier height of the vehicle; the second time is the time when the front axle of the vehicle moves from the initial position to the same level as the initial position, and the third time is the time when the front axle of the vehicle moves from the same level as the initial position to contact with the ground;
and determining the falling inclination angle according to the vehicle rotation angular acceleration, the first time, the second time and the third time.
In a second aspect, the present invention provides a method for determining a drop height in a vehicle drop equivalent test, including:
obtaining the falling inclination angle obtained in the method;
and determining the falling height according to the falling inclination angle, the vehicle falling speed and the falling wall barrier height.
In a third aspect, the present invention provides a device for determining a drop inclination in a vehicle drop equivalent test, including:
the vehicle rotation angular acceleration determining module is used for determining the vehicle rotation angular acceleration according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle mass center and the distance between the vehicle rear axle and the vehicle mass center;
the first time determining module is used for determining a first time according to the vehicle falling speed and the vehicle wheelbase; the first time is the time when the rear axle of the vehicle moves from an initial position to the top end of the falling barrier, wherein the initial position is the position where the front axle of the vehicle is positioned when the front axle of the vehicle is positioned at the top end of the falling barrier;
the second time and third time determining module is used for determining the second time and the third time according to the falling speed, the falling barrier inclination angle and the falling barrier height of the vehicle; the second time is the time when the front axle of the vehicle moves from the initial position to the same level as the initial position, and the third time is the time when the front axle of the vehicle moves from the same level as the initial position to contact with the ground;
and the falling inclination angle determining module is used for determining the falling inclination angle according to the vehicle rotation angular acceleration, the first time, the second time and the third time.
In a fourth aspect, the present invention provides a device for determining a drop height in a vehicle drop equivalent test, including:
the falling inclination angle acquisition module is used for acquiring the falling inclination angle obtained in the method;
and the falling height determining module is used for determining the falling height according to the falling inclination angle, the vehicle falling speed and the falling wall barrier height.
In a fifth aspect, the present invention provides an electronic device, comprising:
at least one processor, and a memory communicatively coupled to at least one of the processors;
the memory stores instructions executable by at least one processor, and the instructions are executed by at least one processor, so that at least one processor can execute the method for determining the dip angle in the vehicle drop equivalent test or the method for determining the drop height in the vehicle drop equivalent test.
In a sixth aspect, the present invention provides a computer-readable storage medium having stored thereon computer instructions for causing a computer to execute the method for determining a drop inclination in the vehicle drop equivalent test or the method for determining a drop height in the vehicle drop equivalent test.
Compared with the prior art, the invention has the beneficial effects that:
according to the method for determining the falling inclination angle in the vehicle falling equivalent test, the vehicle rotation angular acceleration, the first time, the second time and the third time are determined according to the elements or the parameters, and finally the falling inclination angle is determined according to the determined parameters, so that the falling inclination angle in the equivalent test can be calculated quickly and simply, and the subsequent equivalent test is facilitated.
The method for determining the drop height in the vehicle drop equivalent test provided by the invention combines the drop inclination angle obtained in the prior art, the vehicle drop speed and the drop wall barrier height in the test working condition, and determines the drop height.
The method can be used for rapidly calculating the falling inclination angle and the falling height in the equivalent test, and the vehicle is only required to be placed on the corresponding test bench according to the falling inclination angle and the falling height during the test, so that the falling barrier is not required to be arranged, the vehicle is accelerated, and the like, the test is rapid, convenient and fast, the occupied area is small, and the test cost is greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a method for determining a drop angle in a vehicle drop equivalent test provided in example 1;
FIG. 2 is a simplified model of a vehicle;
FIG. 3 is a schematic illustration of the vehicle history at a first time during a fall;
FIG. 4 is a schematic illustration of the vehicle history at a second time during a fall;
FIG. 5 is a velocity component diagram of the front axle at an initial position;
FIG. 6 is a schematic illustration of the vehicle history at a third time during a fall;
FIG. 7 is t 3 A velocity component map of the front axle at the beginning of the phase;
FIG. 8 is a flowchart of a method for determining a drop height in a vehicle drop equivalent test provided in example 2;
FIG. 9 is a schematic illustration of energy analysis of a vehicle during a fall;
FIG. 10 is a schematic illustration of a drop equivalent test in accordance with the present invention;
fig. 11 is a schematic structural view of a device for determining a drop angle in a vehicle drop equivalent test provided in embodiment 3;
fig. 12 is a schematic structural view of a device for determining a drop height in a vehicle drop equivalent test provided in embodiment 4;
fig. 13 is a schematic structural diagram of an electronic device provided in embodiment 5.
Detailed Description
Exemplary embodiments of the present application are described below in conjunction with the accompanying drawings, which include various details of the embodiments of the present application to facilitate understanding, and should be considered as merely exemplary. Accordingly, one of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
Description of parameters in this embodiment: m-rotational moment generated by the vehicle around the centre of mass of the vehicle, M 1 -vehicle front axle load, m 2 Vehicle rear axle load, L 1 -distance of vehicle front axle from vehicle centroid, L 2 -distance of the rear axle of the vehicle from the vehicle centroid, moment of inertia of the vehicle rotating around the vehicle centroid, β -vehicle rotational angular acceleration, t 1 -a first time, t 2 -a second time, t 3 -a third time, θ -fall barrier tilt angle; v 0 -vehicle drop speed; h-drop wall height, g-gravity acceleration, θ 1 -a first rotation angle, θ 2 -a second rotation angle, alpha-fall inclination, H-fall height, omega 1 -a first rotational angular velocity of the vehicle ω 2 -a second rotational angular velocity of the vehicle.
In the prior art, the existing test method has the defects of complex test, large occupied area and the like, so that in order to reduce the implementation difficulty of the drop test and improve the convenience of the drop test, a bench test method (namely a vehicle drop equivalent test method) related to the whole vehicle drop test needs to be formed by using an energy equivalent method. In the vehicle drop equivalent test, the drop inclination angle (i.e. the moment the vehicle contacts the ground, the included angle between the vehicle and the ground) and the drop height are very important parameters in the drop test, and directly influence the accuracy of the test result. Thus, this embodiment focuses on how to determine the fall inclination and the fall height.
Example 1
Fig. 1 is a flowchart of a method for determining a drop tilt in a vehicle drop equivalent test according to the present embodiment. The method may be performed by a device for determining the drop angle in a vehicle drop equivalent test, which may be constituted by software and/or hardware and is typically integrated in an electronic device.
Referring to fig. 1, the method for determining a drop tilt angle in the vehicle drop equivalent test includes the following steps:
s110, determining the rotational angular acceleration of the vehicle according to the axle load of the front axle of the vehicle, the axle load of the rear axle of the vehicle, the distance between the front axle of the vehicle and the mass center of the vehicle and the distance between the rear axle of the vehicle and the mass center of the vehicle.
The vehicle front axle load refers to the load born by the vehicle front axle and can be obtained through axle load meter measurement. The "vehicle rear axle load" refers to the load borne by the vehicle rear axle, and can be obtained by measuring the load by an axle load meter. "distance of the front axle of the vehicle from the center of mass of the vehicle" refers to the horizontal distance between the front axle and the center of mass of the vehicle when the vehicle is in the horizontal plane. "distance of the rear axle of the vehicle from the center of mass of the vehicle" refers to the horizontal distance between the rear axle and the center of mass of the vehicle when the vehicle is in the horizontal plane. The distance between the front axle and the mass center of the vehicle and the distance between the rear axle and the mass center of the vehicle are calculated by directly using the axle load of the front axle, the axle load of the rear axle and the axle distance of the vehicle. The "vehicle rotational angular acceleration" refers to an angular acceleration when the vehicle rotates in a first time.
Alternatively, the angular acceleration of the vehicle may be obtained by acquiring an angular velocity change curve of the vehicle by using an angular velocity sensor mounted on the vehicle body, and then calculating the time derivative.
Preferably, the determining the vehicle rotation angular acceleration according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle centroid, and the distance between the vehicle rear axle and the vehicle centroid includes:
determining a rotation moment generated by the vehicle around the mass center of the vehicle according to the axle load of the front axle of the vehicle and the distance between the front axle of the vehicle and the mass center of the vehicle;
determining the rotational inertia of the vehicle around the vehicle mass center according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle mass center and the distance between the vehicle rear axle and the vehicle mass center;
and determining the vehicle rotation angular acceleration according to the rotation moment and the rotation inertia.
A simplified model of the vehicle is shown in fig. 2.
Analyzing the falling process of the vehicle, wherein the vehicle is driven away from the front axle of the vehicle at a first time (shown in figure 3)When the barrier is dropped, the front axle is affected by gravity, which causes the vehicle to generate a rotational moment M, m=m about the centroid 1 gL 1 (equation 1).
The simplified moment of inertia I of the vehicle about the vehicle centroid:
the vehicle rotational angular acceleration β can be calculated from the formulas 1 and 2:
after the rear axle of the vehicle leaves the barrier, the vehicle is no longer subject to the rotational moment of the front axle due to the loss of support force of the barrier, i.e. the vehicle will perform a rotational movement around the centre of mass of the vehicle at the existing angular velocity until the front axle is in contact with the ground.
S120, determining a first time according to the vehicle falling speed and the vehicle wheelbase; the first time is the time when the rear axle of the vehicle moves from an initial position to the top end of the falling barrier, wherein the initial position is the position where the front axle of the vehicle is positioned when the front axle of the vehicle is positioned at the top end of the falling barrier.
Where "vehicle drop speed" refers to the speed at which the vehicle falls off the barrier under the actual conditions simulated in the equivalent test.
Referring to FIG. 3, a first time t 1 For the time that the rear axle of the vehicle moves from the initial position to the top of the drop barrier, the portion forward of the rear axle is shown with a broken line since the movement of the front axle is not considered.
S130, determining a second time and a third time according to the falling speed, the falling barrier inclination angle and the falling barrier height of the vehicle; the second time is a time when the vehicle front axle moves from the initial position to the same level as the initial position, and the third time is a time when the vehicle front axle moves from the same level as the initial position to contact with the ground.
Preferably, the determining the second time and the third time according to the vehicle falling speed, the falling barrier inclination angle and the falling barrier height includes:
determining a second time based on the vehicle fall speed and the fall obstacle dip angle;
and determining a third time according to the vehicle falling speed, the falling barrier inclination angle and the falling barrier height.
Referring to FIG. 4, a second time t 2 For the time when the front axle of the vehicle moves from the initial position to the same level as the initial position, since the movement condition of the rear axle is not considered, the portion behind the front axle is indicated by a broken line.
Referring to FIG. 5, which is a velocity component diagram of the front axle at the initial position, v is shown in FIG. 5 z ＝v 0 sin theta, using velocity and time calculation formula V t ＝V 0 +at; wherein: v (V) 0 ＝v z ，V t =0, a is gravitational acceleration g.
Taking the gravity acceleration g=10, the time t can be obtained 2 ：
Referring to FIG. 6, a third time t 3 For the time when the front axle of the vehicle moves from the same level as the initial position to contact with the ground, the portion behind the front axle is indicated by a broken line since the movement condition of the rear axle is not considered.
See FIG. 7 for t 3 The velocity component diagram of the front axle at the beginning of the phase is represented by the formulaThe vertical velocity v of the front axle when contacting the ground can be obtained t 。
Calculating formula V using speed and time t ＝V 0 +at; wherein: v (V) 0 ＝v z A is the gravitational acceleration g.
Taking the gravity acceleration g=10, the time t can be obtained 3 ：
From equations 4, 5 and 6, time t is known 1 In relation to the wheelbase and the falling speed of the vehicle, the longer the wheelbase the longer t, with the speed unchanged 1 The larger. Time t 2 And t 3 In relation to the falling speed of the vehicle and the overall dimensions of the barrier, the higher the speed, the longer the corresponding time, without changing the overall dimensions of the barrier.
And S140, determining the falling inclination angle according to the vehicle rotation angular acceleration, the first time, the second time and the third time.
Preferably, the vehicle drop test category includes a first category and a second category, the first category being that a sum of the second time and the third time is greater than or equal to the first time, the second category being that a sum of the second time and the third time is less than the first time;
if the vehicle drop test class is the first class, determining a first rotation angular velocity of the vehicle according to the rotation angular acceleration of the vehicle and the first time; determining a first rotation angle according to the first rotation angular velocity and the first time of the vehicle; determining a second rotation angle according to the first rotation angular velocity, the first time, the second time and the third time of the vehicle; determining a falling inclination angle according to the first rotation angle and the second rotation angle;
if the vehicle drop test class is the second class, determining a second rotational angular velocity of the vehicle according to the rotational angular acceleration of the vehicle, the second time and the third time; and determining a falling inclination angle according to the second rotation angular speed, the second time and the third time of the vehicle.
According to the analysis, the falling time of the front axle of the vehicle is t 2 +t 3 . According to different types of vehicles, namely the length of the wheelbase of the vehicle, the falling process of the vehicle can be divided into two cases: case 1 is t 2 +t 3 ≥t 1 The method comprises the steps of carrying out a first treatment on the surface of the Case 2 is t 2 +t 3 ＜t 1 . The drop tilt angle α of the vehicle is calculated for each of the two cases.
Case 1: t is t 2 +t 3 ≥t 1
In this case, the rotation angle of the vehicle includes two parts, one part being a uniform acceleration rotation before the rear axle of the vehicle leaves the barrier; part of the rotation is uniform after the rear axle of the vehicle leaves the barrier.
For the first part of the uniform acceleration rotation process, the vehicle rotation angle calculation process is as follows:
from equations 4 and 5, the angular velocity ω vehicle first rotation angular velocity ω can be calculated 1 。
From equations 4 and 7, the first rotation angle of the vehicle can be calculated
For the uniform rotation process of the second part, the vehicle rotation angle calculation process is as follows:
the front axle falls for a residual time of
t＝t 2 +t 3 -t 1 (equation 9)
From equations 7 and 9, the second rotation angle of the vehicle can be calculated
From equations 8 and 10, the roll angle of the vehicle can be calculated
α＝θ 1 +θ 2 θ (equation 11)
Case 2: t is t 2 +t 3 ＜t 1
In this case, the rotation angle of the vehicle is only the uniform acceleration rotation before the rear axle of the vehicle does not leave the barrier.
From the formulas 3, 5 and 6, the second rotational angular velocity ω of the vehicle can be calculated 2 。
Meanwhile, the falling inclination angle of the vehicle can be calculated
In order to verify the rationality of the deduction process, verification calculation is performed on an actual measured vehicle model. The relevant parameters of the actual measured vehicle model are shown in table 1.
Table 1 test of vehicle model parameters
| Parameter name | Numerical value | Parameter name | Numerical value |
| Front axle load | 433Kg | Initial velocity | 11.11m/s |
| Rear axle load | 450Kg | Height of wall barrier | 0.313m |
| Front axis to centroid distance | 0.989m | Sinusoidal value of barrier dip angle | 0.105 |
| Rear axle to centroid distance | 0.951m | Wheelbase | 1.94m |
From the data in Table 1, t can be calculated 1 ，t 2 And t 3 . The calculation results are as follows:
t 1 ＝0.175s
t 2 ＝0.233s
t 3 ＝0.16s
due to t 2 +t 3 ＞t 1 From equations 8, 10 and 11, the roll angle α of the vehicle, α=0.249 rad, can be calculated
α=14.27° after converting α to angle
In the drop test, the drop inclination angle of the vehicle which is actually collected is 12 degrees. By comparison, the difference between the calculated falling inclination angle and the actually collected falling inclination angle is only 2.27 degrees, and the use requirement is met.
According to the method for determining the falling inclination angle in the vehicle falling equivalent test, the vehicle rotation angular acceleration, the first time, the second time and the third time are determined according to the elements or the parameters, and finally the falling inclination angle is determined according to the determined parameters, so that the falling inclination angle in the equivalent test can be calculated quickly and simply, and the subsequent equivalent test is facilitated.
Example 2
Referring to fig. 8, the embodiment provides a method for determining a drop height in a vehicle drop equivalent test, including:
s210, acquiring a falling inclination angle.
The drop tilt was determined by the method of example 1.
S220, determining the falling height according to the falling inclination angle, the vehicle falling speed and the falling wall barrier height.
The energy distribution of the vehicle at the moment the vehicle falls into contact with the ground is shown in fig. 9.
As can be seen from fig. 9, when the vehicle contacts the ground after falling, the total energy E of the vehicle is:
energy distribution E of vehicle in vertical direction z The method comprises the following steps:
as can be seen from fig. 10, the potential energy E in the vertical direction of the vehicle is raised to the falling height z The method comprises the following steps:
E z = mgH (equation 15)
From equations 14 and 15:
from equation 16, the final vehicle drop height is determined by the initial velocity v 0 The drop angle alpha at the moment of contact of the vehicle with the ground and the barrier height h. Therefore, after knowing the falling inclination, the initial velocity v under the falling condition is combined 0 And the height h of the barrier, the drop height can be calculated according to equation 16.
By the following steps ofThe conversion method comprises the steps of obtaining the rotation angle alpha of the vehicle according to calculation aiming at different vehicle types, and then according to the initial speed v of the vehicle 0 And the wall height h, the converted drop height can be obtained by using the formula 16. Thus, the vertical drop test of different vehicle types under the working conditions of different speeds is realized.
Example 3
Referring to fig. 11, the present embodiment provides a device for determining a drop inclination in a vehicle drop equivalent test, including:
a vehicle rotational angular acceleration determining module 101 for determining a vehicle rotational angular acceleration based on a vehicle front axle load, a vehicle rear axle load, a distance between the vehicle front axle and a vehicle centroid, and a distance between the vehicle rear axle and the vehicle centroid;
a first time determining module 102, configured to determine a first time according to a vehicle drop speed and a vehicle wheelbase; the first time is the time when the rear axle of the vehicle moves from an initial position to the top end of the falling barrier, wherein the initial position is the position where the front axle of the vehicle is positioned when the front axle of the vehicle is positioned at the top end of the falling barrier;
a second time and third time determining module 103 for determining a second time and a third time according to a vehicle falling speed, a falling barrier inclination angle, and a falling barrier height; the second time is the time when the front axle of the vehicle moves from the initial position to the same level as the initial position, and the third time is the time when the front axle of the vehicle moves from the same level as the initial position to contact with the ground;
the falling inclination determining module 104 is configured to determine a falling inclination according to the vehicle rotational angular acceleration, the first time, the second time, and the third time.
The device is used for executing the method described in embodiment 1, and thus has at least the functional modules and advantageous effects corresponding to the above-described method.
Example 4
Referring to fig. 12, the embodiment provides a device for determining a drop height in a vehicle drop equivalent test, including:
a falling inclination acquisition module 201 for acquiring the falling inclination obtained in the method of example 1;
the falling height determining module 202 is configured to determine a falling height according to the falling inclination angle, the vehicle falling speed and the falling wall barrier height.
The device is used for executing the method described in the embodiment 2, and thus has at least the functional module and the advantageous effects corresponding to the above-described method.
Example 5
As shown in fig. 13, the present embodiment provides an electronic device including:
at least one processor; and
a memory communicatively coupled to at least one of the processors; wherein,
the memory stores instructions executable by at least one of the processors to enable the at least one processor to perform the method described above. At least one processor in the electronic device is capable of performing the above-described method and thus has at least the same advantages as the above-described method.
Optionally, the electronic device further includes an interface for connecting the components, including a high-speed interface and a low-speed interface. The various components are interconnected using different buses and may be mounted on a common motherboard or in other manners as desired. The processor may process instructions executing within the electronic device, including instructions stored in or on memory to display graphical information of a GUI (Graphical User Interface ) on an external input/output device, such as a display device coupled to the interface. In other embodiments, multiple processors may be used with multiple memories, and/or multiple buses may be used with multiple memories, if desired. Also, multiple electronic devices (e.g., as a server array, a set of blade servers, or a multi-processor system) may be connected, with each device providing some of the necessary operations. One processor 301 is illustrated in fig. 13.
The memory 302 is used as a computer readable storage medium, and may be used to store a software program, a computer executable program, and a module, such as a program instruction/module corresponding to a method for determining a drop inclination angle in a vehicle drop equivalent test or a method for determining a drop height in a vehicle drop equivalent test in an embodiment of the present invention. The processor 301 executes various functional applications of the device and data processing, i.e. implements the methods described above, by running software programs, instructions and modules stored in the memory 302.
Memory 302 may include primarily a program storage area and a data storage area, wherein the program storage area may store an operating system, at least one application program required for functionality; the storage data area may store data created according to the use of the terminal, etc. In addition, memory 302 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, memory 302 may further include memory located remotely from processor 301, which may be connected to the device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The electronic device may further include: an input device 303 and an output device 304. The processor 301, memory 302, input device 303, and output device 304 may be connected by a bus or other means, for example in fig. 13.
The input means 303 may receive input digital or character information, and the output means 304 may include a display device, an auxiliary lighting means (e.g., LED), a tactile feedback means (e.g., vibration motor), and the like. The display device may include, but is not limited to, a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display, and a plasma display. In some implementations, the display device may be a touch screen.
Example 6
The present embodiment provides a computer-readable storage medium having stored thereon computer instructions for causing the computer to perform the above-described method. The computer instructions on the computer-readable storage medium are for causing a computer to perform the above method and thus have at least the same advantages as the above method.
Any combination of one or more computer readable media may be employed in the present invention. The medium may be a computer readable signal medium or a computer readable storage medium. The medium can be, for example but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the medium include: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In this document, a medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF (Radio Frequency) and the like, or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present application may be performed in parallel, sequentially, or in a different order, provided that the desired results of the technical solutions disclosed in the present application can be achieved, and are not limited herein.
The above embodiments do not limit the scope of the application. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application are intended to be included within the scope of the present application.
Claims (8)
1. The method for determining the drop inclination angle in the vehicle drop equivalent test is characterized by comprising the following steps of:
determining a vehicle rotation angular acceleration according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle mass center and the distance between the vehicle rear axle and the vehicle mass center;
determining a first time according to the vehicle falling speed and the vehicle wheelbase; the first time is the time when the rear axle of the vehicle moves from an initial position to the top end of the falling barrier, wherein the initial position is the position where the front axle of the vehicle is positioned when the front axle of the vehicle is positioned at the top end of the falling barrier;
determining a second time and a third time according to the falling speed, the falling barrier inclination angle and the falling barrier height of the vehicle; the second time is the time when the front axle of the vehicle moves from the initial position to the same level as the initial position, and the third time is the time when the front axle of the vehicle moves from the same level as the initial position to contact with the ground;
the vehicle drop test category comprises a first category and a second category, wherein the first category refers to that the sum of the second time and the third time is larger than or equal to the first time, and the second category refers to that the sum of the second time and the third time is smaller than the first time;
if the vehicle drop test class is the first class, determining a first rotation angular velocity of the vehicle according to the rotation angular acceleration of the vehicle and the first time; determining a first rotation angle according to the first rotation angular velocity and the first time of the vehicle; determining a second rotation angle according to the first rotation angular velocity, the first time, the second time and the third time of the vehicle; determining a falling inclination angle according to the first rotation angle and the second rotation angle; the vehicle rotational angular acceleration refers to an angular acceleration when the vehicle rotates in a first time;
if the vehicle drop test class is the second class, determining a second rotational angular velocity of the vehicle according to the rotational angular acceleration of the vehicle, the second time and the third time; and determining a falling inclination angle according to the second rotation angular speed, the second time and the third time of the vehicle.
2. The method for determining a drop angle in a vehicle drop equivalence test according to claim 1, wherein determining the vehicle rotational angular acceleration based on the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle centroid, the distance between the vehicle rear axle and the vehicle centroid, comprises:
determining a rotation moment generated by the vehicle around the mass center of the vehicle according to the axle load of the front axle of the vehicle and the distance between the front axle of the vehicle and the mass center of the vehicle;
determining the rotational inertia of the vehicle around the vehicle mass center according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle mass center and the distance between the vehicle rear axle and the vehicle mass center;
and determining the vehicle rotation angular acceleration according to the rotation moment and the rotation inertia.
3. The method for determining a drop angle in a vehicle drop equivalent test according to claim 1, wherein said determining a second time and a third time based on a vehicle drop speed, a drop barrier angle and a drop barrier height comprises:
determining a second time based on the vehicle fall speed and the fall obstacle dip angle;
and determining a third time according to the vehicle falling speed, the falling barrier inclination angle and the falling barrier height.
4. The method for determining the drop height in the vehicle drop equivalent test is characterized by comprising the following steps of:
obtaining a falling angle of inclination obtained in the method of any one of claims 1-3;
and determining the falling height according to the falling inclination angle, the vehicle falling speed and the falling wall barrier height.
5. The device for determining the falling inclination angle in the vehicle falling equivalent test is characterized by comprising the following components:
the vehicle rotation angular acceleration determining module is used for determining the vehicle rotation angular acceleration according to the vehicle front axle load, the vehicle rear axle load, the distance between the vehicle front axle and the vehicle mass center and the distance between the vehicle rear axle and the vehicle mass center;
the first time determining module is used for determining a first time according to the vehicle falling speed and the vehicle wheelbase; the first time is the time when the rear axle of the vehicle moves from an initial position to the top end of the falling barrier, wherein the initial position is the position where the front axle of the vehicle is positioned when the front axle of the vehicle is positioned at the top end of the falling barrier;
the second time and third time determining module is used for determining the second time and the third time according to the falling speed, the falling barrier inclination angle and the falling barrier height of the vehicle; the second time is the time when the front axle of the vehicle moves from the initial position to the same level as the initial position, and the third time is the time when the front axle of the vehicle moves from the same level as the initial position to contact with the ground;
the drop inclination angle determining module is used for determining a vehicle drop test category comprising a first category and a second category, wherein the first category refers to that the sum of the second time and the third time is larger than or equal to the first time, and the second category refers to that the sum of the second time and the third time is smaller than the first time;
if the vehicle drop test class is the first class, determining a first rotation angular velocity of the vehicle according to the rotation angular acceleration of the vehicle and the first time; determining a first rotation angle according to the first rotation angular velocity and the first time of the vehicle; determining a second rotation angle according to the first rotation angular velocity, the first time, the second time and the third time of the vehicle; determining a falling inclination angle according to the first rotation angle and the second rotation angle; the vehicle rotational angular acceleration refers to an angular acceleration when the vehicle rotates in a first time;
if the vehicle drop test class is the second class, determining a second rotational angular velocity of the vehicle according to the rotational angular acceleration of the vehicle, the second time and the third time; and determining a falling inclination angle according to the second rotation angular speed, the second time and the third time of the vehicle.
6. The utility model provides a determining device of drop height in vehicle drop equivalent test which characterized in that includes:
a falling inclination acquisition module for acquiring a falling inclination obtained in the method of any one of claims 1 to 3;
and the falling height determining module is used for determining the falling height according to the falling inclination angle, the vehicle falling speed and the falling wall barrier height.
7. An electronic device, comprising:
at least one processor, and a memory communicatively coupled to at least one of the processors;
wherein the memory stores instructions executable by at least one of the processors to enable the at least one of the processors to perform the method of determining a drop tilt in a vehicle drop equivalent test as claimed in any one of claims 1 to 3 or the method of determining a drop height in a vehicle drop equivalent test as claimed in claim 4.
8. A computer-readable storage medium having stored thereon computer instructions for causing the computer to perform the method of determining a drop tilt in a vehicle drop equivalent test as claimed in any one of claims 1 to 3 or the method of determining a drop height in a vehicle drop equivalent test as claimed in claim 4.
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