CN110807260B - Method for calculating opening speed of automobile trunk, storage medium and system - Google Patents
Method for calculating opening speed of automobile trunk, storage medium and system Download PDFInfo
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Abstract
The invention provides a calculation method, a storage medium and a system for the opening speed of an automobile trunk, wherein the method comprises the following steps: constructing a balance system model; inputting known parameter data into a balance system model, and calculating axial component force of output torque and torsion bar output force; constructing a trunk system stress model; inputting known parameter data, output torque and axial component force of torsion bar output force into a trunk system stress model, and calculating system torque; and calculating the time and speed of the trunk rotating to any radian according to the system torque. According to the invention, by establishing the theoretical model of the trunk stress, the speed of any time and any position in the trunk opening process can be calculated only based on design input without actual test, so that the trunk opening performance can be well ensured.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a method, a storage medium and a system for calculating the opening speed of an automobile trunk.
Background
With the increasing progress of society and the continuous improvement of the living standard of people, the requirements of people on the comfort of automobiles are also higher, and the trunk is taken as an important part of the rear part of the automobile and has higher requirements on the opening performance.
Because the stress condition is complex in the current trunk opening process, the opening motion state of the rear cover is difficult to accurately simulate through theoretical calculation, so that the actual trunk opening performance and design difference are large, the problems of irregularity, high speed, incapability of opening to the top and the like occur, and finally, the problems can be solved only by repeatedly modifying the design, thereby increasing the development period and the cost.
Disclosure of Invention
Based on the problems, the invention provides a calculation method, a storage medium and a system for the opening speed of the trunk of an automobile, and the opening performance of the trunk can be well ensured by establishing a theoretical model of the stress of the trunk and calculating the speed of any time and any position in the opening process of the trunk under the condition of not carrying out an actual test only based on design input.
The invention provides a calculation method of the opening speed of an automobile trunk, which comprises the following steps:
constructing a balance system model;
inputting known parameter data into a balance system model, and calculating axial component force of output torque and torsion bar output force;
constructing a trunk system stress model;
inputting known parameter data, output torque and axial component force of torsion bar output force into a trunk system stress model, and calculating system torque;
and calculating the time and speed of the trunk rotating to any radian according to the system torque.
Furthermore, the method comprises the following steps: and (5) making a time-speed curve graph according to the time and the speed of the trunk rotating to any radian.
In addition, the balance system model is:
M＝2M twisting device /(L a +2x)/sin(π-β+σ)*(L b -y)*sin(c+σ)；
F Shaft ＝F*cos(c+σ)；
Wherein M is output torque, 2M Twisting device To input torque F Shaft Is the axial component force of the output force of the torsion bar, F is the output resultant force, L a For input rod length, L b For output rod length, x is friction-induced input rod length change, y is friction-induced output rod length changeBeta is the included angle between the input shaft and the intermediate shaft, c is the included angle between the output shaft and the intermediate shaft, and sigma is the intermediate shaft angle change caused by friction.
In addition, the trunk system stress model is:
M G ＝m*g*L s *cosλ；
M closing device ＝M-M G -M f ；
Wherein M is G Torque provided for the gravity of the trunk, M f Torque provided for friction, M Closing device The torque applied to the trunk is the system torque, M is the output torque, M is the weight of the trunk, g is the gravitational acceleration, L s And μ is an equivalent friction coefficient, r is a radius of a hinge rotating shaft, λ is an included angle between the gravity center of the trunk and the output shaft, and γ is an included angle between the output shaft and the gravity center of the trunk.
In addition, calculating the time and speed of the trunk to rotate to any radian according to the system torque includes: calculating the angular acceleration of the trunk and calculating the speed according to the angular acceleration of the trunk, wherein the calculation formula of the angular acceleration of the trunk is as follows:
ω＝M closing device /J
Wherein: omega is the angular acceleration of the trunk, M Closing device And J is the rotational inertia of the trunk system.
In addition, the formula for calculating the speed from the trunk angular acceleration is:
V i-1 /L h *t i +1/2*ω i *t i 2 ＝S/n；
V i for speed, L h Distance t is the distance between the rotating shaft and the hand opening point i For any radian passing time omega i The angular acceleration of any radian is used for running the trunk, and S is the total radian value of the trunk rotation.
In addition, the time of the trunk running to any radian is calculated, and the calculation formula is as follows from the first radian:
t i for any radian passing time, T i For the trunk to travel to any arc.
The invention also proposes a storage medium storing computer instructions for executing the method of calculating the opening speed of a trunk of a motor vehicle according to any one of the above-mentioned claims, when the computer executes the computer instructions.
The invention also provides a system for calculating the opening speed of the trunk of the automobile, which comprises at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
constructing a balance system model;
inputting known parameter data into a balance system model, and calculating axial component force of output torque and torsion bar output force;
constructing a trunk system stress model;
inputting known parameter data, output torque and axial component force of torsion bar output force into a trunk system stress model, and calculating system torque;
and calculating the time and speed of the trunk rotating to any radian according to the system torque.
By adopting the technical scheme, the method has the following beneficial effects:
according to the invention, by establishing the theoretical model of the trunk stress, the speed of any time and any position in the trunk opening process can be calculated only based on design input without actual test, so that the trunk opening performance can be well ensured.
Drawings
FIG. 1 is a flowchart of a method for calculating an opening speed of a trunk of an automobile according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a four-bar linkage system model provided in one embodiment of the present invention;
FIG. 3 is a schematic diagram of a trunk system stress model provided in one embodiment of the invention;
FIG. 4 is an exemplary graph of a trunk opening time-speed curve provided in accordance with one embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the specific embodiments and the accompanying drawings. It is intended that the invention be limited only by the specific embodiments illustrated and not by any means, but that it is intended that the invention be limited only by the terms of the appended claims.
Referring to fig. 1, the invention provides a method for calculating an opening speed of an automobile trunk, which comprises the following steps:
s001, constructing a balance system model;
step S002, inputting known parameter data into a balance system model, and calculating axial component force of output torque and torsion bar output force;
s003, constructing a trunk system stress model;
s004, inputting known parameter data, output torque and axial component force of torsion bar output force into a trunk system stress model, and calculating system torque;
and step S005, calculating the time and speed of the trunk rotating to any radian according to the system torque.
In an embodiment of the invention, step S001 constructs a balanced system model:
the balance system is subjected to stress analysis (four-bar structure) to establish a theoretical model, and optionally, as shown in fig. 2, AB represents a torsion bar rotated by a certain angle, BC represents an intermediate bar, CD represents a movable end of the hinge, and AD represents a fixed end of the hinge.
Under the torque action of the torsion bar, the balance model system can easily obtain the following relational expressions (1) and (2) according to the stress conditions of the AB and BC bars, so as to calculate the axial component force of the output torque and the output force of the torsion bar.
M＝2M Twisting device /(L a +2x)/sin(π-β+σ)*(L b -y)*sin(c+σ)； (1)
F Shaft ＝F*cos(c+σ)； (2)
Wherein: m is output torque, 2M Twisting device To input torque F Shaft Is the axial component force of the output force of the torsion bar, F is the output resultant force, L a For input rod length, L b For the length of the output rod, x is the length change of the input rod caused by friction, y is the length change of the output rod caused by friction, beta is the included angle between the input shaft and the intermediate shaft under a certain rotation angle, c is the included angle between the output shaft and the intermediate shaft under a certain rotation angle, and sigma is the angle change of the intermediate shaft caused by friction.
Step S002, inputting known parameter data into a balance system model, and calculating axial component force of output torque and torsion bar output force;
according to the known data "F is the output resultant force, L a For input rod length, L b For the length of the output rod, x is the length change of the input rod caused by friction, y is the length change of the output rod caused by friction, beta is the included angle between the input shaft and the intermediate shaft under a certain rotation angle, c is the included angle between the output shaft and the intermediate shaft under a certain rotation angle, sigma is the angle change of the intermediate shaft caused by friction, and the axial component force F of the output torque M and the output force of the torsion bar is calculated according to formulas (1) and (2) Shaft 。
Step S003 constructs a trunk system stress model, optionally as shown with reference to figure 3,
the stress model of the trunk system can be established as follows:
M G ＝ m*g*L s *cosλ； (3)
M closing device ＝M-M G -M f ； (5)
Wherein M is G Torque provided for the gravity of the trunk, M f Torque provided for friction, M Closing device The torque applied to the trunk is the system torque, M is the output torque, M is the weight of the trunk, g is the gravitational acceleration, L s And μ is an equivalent friction coefficient, r is a radius of a hinge rotating shaft, λ is an included angle between the gravity center of the trunk and the output shaft, and γ is an included angle between the output shaft and the gravity center of the trunk.
In step S004, inputting known parameter data, output torque and axial component force of torsion bar output force into a trunk system stress model, and calculating system torque;
known data "M is output torque, M is trunk weight, g is gravitational acceleration, L s For the distance from the center of gravity to the rotating shaft, mu is the equivalent friction coefficient, r is the radius of the rotating shaft of the hinge, lambda is the included angle between the center of gravity of the trunk and the output shaft, gamma is the included angle between the output shaft and the center of gravity of the trunk, and these data are sequentially brought into formulas (3), (4) and (5) to obtain the system torque M of the trunk system Closing device 。
In step S005, the time and speed at which the trunk rotates to an arbitrary arc are calculated from the system torque.
Alternatively, the trunk angular acceleration is calculated first,
the calculation formula of the angular acceleration of the trunk is as follows:
ω＝M closing device /J (6)
Wherein: omega is the angular acceleration of the trunk, M Closing device And J is the rotational inertia of the trunk system.
The formula for calculating the speed according to the angular acceleration of the trunk is as follows:
V i-1 /L h *t i +1/2*ω i *t i 2 ＝S/n； (7)
V i for speed, L h Distance t is the distance between the rotating shaft and the hand opening point i For any radian passing time omega i The angular acceleration of any radian is used for running the trunk, and S is the total radian value of the trunk rotation.
Dividing the whole trunk opening process into n equal radians by adopting the principle of calculus, calculating the passing time of a certain radian according to an expression (7), calculating the speed of the trunk running to the certain radian according to an expression (8), calculating the moment of the trunk running to the certain radian according to a relational expression (9), calculating the time of the trunk running to any radian from the first radian until the nth radian is calculated, taking n as an integer value of 30 or more, wherein the calculation formula is as follows:
t i for any radian passing time, T i For the trunk to travel to any arc.
Obviously, the initial speed of the trunk system is 0, the elapsed time of the first radian is calculated according to the expression (7), the final speed of the first radian is calculated according to the expression (8), namely the initial speed of the second radian, the final moment of the first radian is calculated according to the expression (9), namely the initial moment of the second radian, and the calculation is circulated until the nth radian is finished.
According to the trunk opening speed calculating method, the theoretical model of trunk stress is established, and speeds at any time and any position in the trunk opening process can be calculated only based on design input without actual tests, so that trunk opening performance can be well guaranteed.
Referring to fig. 4, in one embodiment thereof, the method further comprises: and (3) making a time-speed curve graph according to the time and the speed of the trunk rotating to any radian, and making the time-speed curve graph by matching the time and the speed in a one-to-one correspondence manner according to the calculation result. In the early design stage, parameters such as the opening time, the maximum speed, the acceleration change condition and the like of the trunk can be known and optimized through the graph under the condition of not carrying out actual experiments by adjusting design input, and the parameters are important indexes for measuring the perceived comfort of a customer for opening the trunk, so that subsequent design changes are reduced, and the related development period and cost are reduced.
In one embodiment, the balance system model is:
M＝2M twisting device /(L a +2x)/sin(π-β+σ)*(L b -y)*sin(c+σ)；
F Shaft ＝F*cos(c+σ)；
Wherein M is output torque, 2M Twisting device To input torque F Shaft Is the axial component force of the output force of the torsion bar, F is the output resultant force, L a For input rod length, L b For the output rod length, x is the input rod length change caused by friction, y is the output rod length change caused by friction, β is the angle between the input shaft and the intermediate shaft, c is the angle between the output shaft and the intermediate shaft, and σ is the intermediate shaft angle change caused by friction.
By establishing a balance system model, the axial component force of the output torque and the output force of the torsion bar is calculated.
In one embodiment, the trunk system force model is:
M G ＝m*g*L s *cosλ；
M closing device ＝M-M G -M f ；
Wherein M is G Torque provided for the gravity of the trunk, M f Torque provided for friction, M Closing device The torque applied to the trunk is the system torque, M is the output torque, M is the weight of the trunk, g is the gravitational acceleration, L s Mu is equivalent friction coefficient, r is radius of hinge rotating shaft, lambda is centre of gravity of trunk and output shaftAnd gamma is the included angle between the center of gravity of the output shaft and the trunk to the center line. The aim of calculating the torque of the system is fulfilled by establishing a stress model of the trunk system.
In one embodiment, calculating the time and speed at which the trunk rotates to any arc based on the system torque includes: calculating the angular acceleration of the trunk and calculating the speed according to the angular acceleration of the trunk, wherein the calculation formula of the angular acceleration of the trunk is as follows:
ω＝M closing device /J
Wherein: omega is the angular acceleration of the trunk, M Closing device And J is the rotational inertia of the trunk system.
To determine the angular velocity of the trunk, the angular velocity of the trunk is first determined, and a velocity value of the trunk angle is obtained.
In one embodiment, the formula for calculating speed from the angular acceleration of the trunk is:
V i-1 /L h *t i +1/2*ω i *t i 2 ＝S/n；
V i for speed, L h Distance t is the distance between the rotating shaft and the hand opening point i For any radian passing time omega i The angular acceleration of any radian is used for running the trunk, and S is the total radian value of the trunk rotation.
In one embodiment, the time for the trunk to run to any one radian is calculated, starting with the first radian, as:
t i for any radian passing time, T i For the trunk to travel to any arc.
Dividing the whole trunk opening process into n equal radians by adopting the principle of calculus, calculating the passing time of a certain radian according to an expression (7), calculating the speed of the trunk running to the certain radian according to an expression (8), calculating the moment of the trunk running to the certain radian according to a relational expression (9), calculating the time of the trunk running to any radian from the first radian until the nth radian is calculated, taking n as an integer value of 30 or more, wherein the calculation formula is as follows:
t i for any radian passing time, T i For the trunk to travel to any arc.
Obviously, the initial speed of the trunk system is 0, the elapsed time of the first radian is calculated according to the expression (7), the final speed of the first radian is calculated according to the expression (8), namely the initial speed of the second radian, the final moment of the first radian is calculated according to the expression (9), namely the initial moment of the second radian, and the calculation is circulated until the nth radian is finished.
By adopting the principle of calculus, the whole trunk opening process is divided into n equal radians, so that the speed of a trunk system can be calculated.
The present invention proposes a storage medium storing computer instructions for executing the method of calculating the opening speed of an automotive trunk as described in any one of the above, when the computer executes the computer instructions.
The invention provides a calculation system of the opening speed of an automobile trunk, which comprises at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
constructing a balance system model;
inputting known parameter data into a balance system model, and calculating axial component force of output torque and torsion bar output force;
constructing a trunk system stress model;
inputting known parameter data, output torque and axial component force of torsion bar output force into a trunk system stress model, and calculating system torque;
and calculating the time and speed of the trunk rotating to any radian according to the system torque.
What has been described above is merely illustrative of the principles and preferred embodiments of the present invention. It should be noted that several other variants are possible to those skilled in the art on the basis of the principle of the invention and should also be considered as the scope of protection of the present invention.
Claims (7)
1. A method of calculating an opening speed of an automobile trunk, comprising:
constructing a balance system model;
inputting known parameter data into a balance system model, and calculating axial component force of output torque and torsion bar output force;
constructing a trunk system stress model;
inputting known parameter data, output torque and axial component force of torsion bar output force into a trunk system stress model, and calculating system torque;
calculating the time and speed of the trunk rotating to any radian according to the system torque;
the balance system model is as follows:
M＝2M twisting device /(L a +2x)/sin(π-β+σ)*(L b -y)*sin(c+σ)；
F Shaft ＝F*cos(c+σ)；
Wherein M is output torque, 2M Twisting device To input torque F Shaft Is the axial component force of the output force of the torsion bar, F is the output resultant force, L a For input rod length, L b For the length of the output rod, x is the length change of the input rod caused by friction, y is the length change of the output rod caused by friction, beta is the included angle between the input shaft and the intermediate shaft, c is the included angle between the output shaft and the intermediate shaft, sigma is the frictionA resulting change in the angle of the intermediate shaft;
the trunk system stress model is as follows:
M G ＝m*g*L s *cosλ；
M closing device ＝M-M G -M f ；
Wherein M is G Torque provided for the gravity of the trunk, M f Torque provided for friction, M Closing device The torque applied to the trunk is the system torque, M is the output torque, M is the weight of the trunk, g is the gravitational acceleration, L s And μ is an equivalent friction coefficient, r is a radius of a hinge rotating shaft, λ is an included angle between the gravity center of the trunk and the output shaft, and γ is an included angle between the output shaft and the gravity center of the trunk.
2. The method for calculating the opening speed of a trunk of a motor vehicle according to claim 1, wherein,
the method further comprises the steps of: and (5) making a time-speed curve graph according to the time and the speed of the trunk rotating to any radian.
3. A method for calculating the opening speed of a trunk of a motor vehicle according to any one of claims 1 to 2, wherein,
calculating the time and speed of the trunk rotating to any radian according to the system torque comprises: calculating the angular acceleration of the trunk and calculating the speed according to the angular acceleration of the trunk, wherein the calculation formula of the angular acceleration of the trunk is as follows:
ω＝M closing device /J
Wherein: omega is the angular acceleration of the trunk, M Closing device And J is the rotational inertia of the trunk system.
4. A method for calculating the opening speed of a trunk of a motor vehicle according to claim 3, wherein,
the formula for calculating the speed according to the angular acceleration of the trunk is as follows:
V i-1 /L h *t i +1/2*ω i *t i 2 ＝S/n；
V i for speed, L h Distance t is the distance between the rotating shaft and the hand opening point i For any radian passing time omega i The angular acceleration of any radian is used for running the trunk, and S is the total radian value of the trunk rotation.
5. The method for calculating the opening speed of a trunk of a motor vehicle according to claim 4, wherein,
calculating the time of the trunk running to any radian, and starting from the first radian, wherein the calculation formula is as follows:
t i for any radian passing time, T i For the trunk to travel to any arc.
6. A storage medium storing computer instructions which, when executed by a computer, are adapted to carry out the method of calculating the opening speed of a trunk of a motor vehicle according to any one of claims 1 to 5.
7. A computing system for the opening speed of a trunk of a vehicle, comprising at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
constructing a balance system model;
inputting known parameter data into a balance system model, and calculating axial component force of output torque and torsion bar output force;
constructing a trunk system stress model;
inputting known parameter data, output torque and axial component force of torsion bar output force into a trunk system stress model, and calculating system torque;
calculating the time and speed of the trunk rotating to any radian according to the system torque;
the balance system model is as follows:
M＝2M twisting device /(L a +2x)/sin(π-β+σ)*(L b -y)*sin(c+σ)；
F Shaft ＝F*cos(c+σ)；
Wherein M is output torque, 2M Twisting device To input torque F Shaft Is the axial component force of the output force of the torsion bar, F is the output resultant force, L a For input rod length, L b For the length of the output rod, x is the length change of the input rod caused by friction, y is the length change of the output rod caused by friction, beta is the included angle between the input shaft and the intermediate shaft, c is the included angle between the output shaft and the intermediate shaft, and sigma is the angle change of the intermediate shaft caused by friction;
the trunk system stress model is as follows:
M G ＝m*g*L s *cosλ；
M closing device ＝M-M G -M f ；
Wherein M is G Torque provided for the gravity of the trunk, M f Torque provided for friction, M Closing device The torque applied to the trunk is the system torque, M is the output torque, M is the weight of the trunk, g is the gravitational acceleration, L s Mu is equivalent friction coefficient, r is half of hinge rotation axisThe diameter lambda is the included angle between the gravity center of the trunk and the axial lead of the output shaft, and gamma is the included angle between the axial lead of the output shaft and the gravity center of the trunk.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101906915A (en) * | 2009-06-02 | 2010-12-08 | 延锋伟世通汽车饰件***有限公司 | Method for designing automobile interior functional part |
| JP2016203720A (en) * | 2015-04-17 | 2016-12-08 | 本田技研工業株式会社 | vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101906915A (en) * | 2009-06-02 | 2010-12-08 | 延锋伟世通汽车饰件***有限公司 | Method for designing automobile interior functional part |
| JP2016203720A (en) * | 2015-04-17 | 2016-12-08 | 本田技研工業株式会社 | vehicle |
Non-Patent Citations (1)
| Title |
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