CN113188812A - Passenger car body six-degree-of-freedom load testing and calculating method - Google Patents
Passenger car body six-degree-of-freedom load testing and calculating method Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to a passenger car body six-degree-of-freedom load testing and calculating method, which comprises the steps that a plurality of three-component force sensors are arranged at a car body suspension support to form an array system so as to determine the six-degree-of-freedom load condition at the support of a tested object suspension support; connecting a 12V power supply with a plurality of three-component force sensors to supply power to the sensors; connecting a data acquisition instrument with the three-component force sensor for acquiring sensor information; acquiring data of the three-component force sensor array system in an automobile test field according to test specifications to obtain the six-degree-of-freedom load at the corresponding position of an automobile body; respectively substituting the measured force and moment into a stress calculation mathematical model for calculation to obtain the stress of three degrees of freedom of the vehicle body and the moment of three degrees of freedom of the vehicle body; and calculating to obtain the six-degree-of-freedom load condition of the vehicle body. The calculation method can accurately obtain the actual value of the six-degree-of-freedom load of the body of the passenger vehicle during the running of the vehicle, and is simple in test and calculation method and easy to realize.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a method for testing and calculating six-degree-of-freedom load of a passenger vehicle body.
Background
When the vehicle runs, the vehicle body bears a large load, mainly comprising the weight of personnel and articles loaded in the vehicle, a vertical load caused by the excitation of the self weight of the vehicle body on a road surface, a longitudinal load caused by the influence of the road surface, acceleration, deceleration, braking and the like, a lateral load caused by the influence of steering, and a bending moment and a torque load. These loads are important parameters in the design of the vehicle body.
One of the main ways to obtain these current stages of loads is to measure the suspension displacement by installing displacement sensors at the suspension positions and installing acceleration sensors on the chassis and the vehicle body to calculate the transfer function from the chassis to the vehicle body; meanwhile, six-component parameters of four wheels are measured. And inputting the parameters of the obtained displacement, the acceleration and the six-component force as boundary loads to a vehicle body model, and calculating to obtain corresponding loads. The method is limited by model precision, boundary conditions and the like, and a certain error exists in a calculation result. How to obtain the actual values of these loads while the vehicle is running has been a pain point in the automotive industry.
The prior art discloses a hydraulic loading test bed for reproducing six-degree-of-freedom load of a wind turbine, which comprises a driving motor, wherein an output shaft of the driving motor is connected with a reduction gearbox, an output shaft of the reduction gearbox is connected with a transmission shaft of a loading device through a coupler, the transmission shaft of the loading device is fixedly connected with a main shaft of a wind turbine generator set, and a balancing weight for simulating the rotational inertia of the wind turbine is fixed on the driving motor; the loading device comprises a box body, a thrust disc positioned in the box body, a transmission shaft rotatably penetrating the center of the thrust disc, and 24 loading units loaded on the thrust disc, wherein a stop mechanism for preventing the thrust disc from rotating is connected between the box body and the thrust disc, and the box body is fixed with the ground.
The prior art also discloses a multi-degree-of-freedom load transfer tool for a test bed of a wind generating set, which comprises an inner ring, an outer ring, connecting beams, a gear ring and an oil groove, wherein the inner ring is arranged at the center of the outer ring and is connected with the outer ring through the connecting beams for connecting a tested mechanism of the test bed and transferring load, the connecting beams are arranged in a radial array mode by taking the circle center of the outer ring as the center, the gear ring and the inner ring are coaxial and are arranged below the connecting beams, the gear ring and the inner ring can generate torque, the gear ring and an external gear can be meshed for transmission to realize torque loading, and the oil groove is provided with a plurality of connecting beams and is arranged on the outer ring by taking the circle center of the outer ring as a central annular array mode, and is used for directly bearing the load of an external load loading device and transferring the load borne by the external load loading device to the outer ring.
The prior art also discloses a wind condition load simulator of a wind generating set, which comprises a mounting frame, a loading revolving shaft and a rotating assembly, wherein the loading revolving shaft is arranged on the mounting frame, one end of the loading revolving shaft is connected with an input shaft of the wind generating set, the other end of the loading revolving shaft is connected with the rotating assembly, a bearing assembly is sleeved on the loading revolving shaft, and a plurality of load loaders used for applying pressure to the outer circumference of the bearing assembly are arranged on the mounting frame.
However, the above-mentioned testing device and method are not suitable for obtaining six-degree-of-freedom load of the body of a passenger car.
Disclosure of Invention
The invention aims to provide a method for testing and calculating six-degree-of-freedom load of a passenger car body, which aims to solve the problem of accurately obtaining the actual value of the six-degree-of-freedom load of the passenger car body when a car runs.
The purpose of the invention is realized by the following technical scheme:
a passenger car body six-degree-of-freedom load testing and calculating method comprises the following steps:
A. a plurality of three-component force sensors are arranged at the supporting point of a vehicle body suspension to form an array system so as to determine the six-degree-of-freedom load condition at the supporting point of the suspension of the tested object;
B. connecting a 12V power supply with a plurality of three-component force sensors to supply power to the sensors;
C. connecting a data acquisition instrument with the three-component force sensor through a data line for acquiring sensor signals;
D. acquiring data of the three-component force sensor array system in an automobile test field according to test specifications to obtain the six-degree-of-freedom load at the corresponding position of an automobile body;
E. d, substituting the three forces obtained by measurement in the step D into the following stress calculation mathematical model for calculation to obtain the stress of three degrees of freedom of the vehicle body;
Fx＝fxA+fxB+fxC+fxD
Fy＝fyA+fyB+fyC+fyD
Fz＝fzA+fzB+fzC+fzD
wherein the content of the first and second substances,
fxA、fxB、fxC、fxDrespectively represents the stress of the X direction of the point A, the point B, the point C and the point D,
fyA、fyB、fyC、fyDrespectively represents the stress of the Y direction of the point A, the point B, the point C and the point D,
fzA、fzB、fzC、fzDrespectively represents the stress of the point A, the point B, the point C and the point D in the z direction,
fx, Fy and Fz respectively represent stress of the car body in the x direction, the y direction and the z direction;
F. substituting the three measured moments into the following moment calculation mathematical model for calculation to obtain three-degree-of-freedom moments of the vehicle body;
wherein, L represents the distance between the point A and the point C, W represents the distance between the point A and the point B, and Mx, My and Mz respectively represent the moments borne by the vehicle body in the directions of x, y and z; and finally, obtaining the six-degree-of-freedom load condition borne by the vehicle body.
Further, step A, the three component force sensors are respectively connected to the suspension fulcrum points of the vehicle body through bolts.
Further, in step a, the number of the three-component force sensors is four.
Further, in step a, the four three-component force sensors are respectively connected to suspension fulcrum points of the vehicle body through bolts.
Further, in the step B, the 12V power supply is connected with the three-component force sensor through wires.
And step C, the data acquisition instrument is connected with the three-component force sensor through a data line.
Compared with the prior art, the invention has the beneficial effects that:
the method for testing and calculating the six-degree-of-freedom load of the passenger car body can accurately obtain the actual value of the six-degree-of-freedom load of the passenger car body when the car runs, and is simple and easy to implement.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic installation diagram of a three-force-dividing device.
Detailed Description
The invention is further illustrated by the following examples:
the present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
The invention relates to a passenger car body six-freedom-degree load testing and calculating method, which comprises the following steps:
the first step is as follows: as shown in FIG. 1, three-component force sensors are respectively installed at four suspension branch points of a vehicle body through bolt connection to form an array system, as shown in FIG. 1. This array system is used to measure the three forces and moments experienced at the suspension fulcrum. Therefore, the six-degree-of-freedom load condition at the suspension pivot of the tested object can be determined.
The second step is that: and a 12V power supply is connected with the three-component force sensor through a wire to supply power to the sensor.
The third step: and the data acquisition instrument is connected with the three-component force sensor through a data line and is used for acquiring sensor signals.
The fourth step: acquiring data of the three-component force sensor array system in an automobile test field according to test specifications to obtain the six-degree-of-freedom load at the corresponding position of an automobile body;
the fifth step: and substituting the three forces obtained by measurement in the fourth step into the following stress calculation mathematical model for calculation to obtain the stress of the three degrees of freedom of the vehicle body.
Fx＝fxA+fxB+fxC+fxD
Fy＝fyA+fyB+fyC+fyD
Fz＝fzA+fzB+fzC+fzD
Wherein:
fxA、fxB、fxC、fxDrespectively represents the stress of the X direction of the point A, the point B, the point C and the point D,
fyA、fyB、fyC、fyDrespectively represents the stress of the Y direction of the point A, the point B, the point C and the point D,
fzA、fzB、fzC、fzDrespectively represents the stress of the point A, the point B, the point C and the point D in the z direction,
fx, Fy and Fz respectively represent stress of the car body in the x direction, the y direction and the z direction;
and a sixth step: and substituting the measured moment into the following moment calculation mathematical model for calculation to obtain the three-degree-of-freedom moment of the vehicle body.
Wherein the content of the first and second substances,
l represents the distance between points a and C,
w represents the distance between points a and B,
mx, My and Mz respectively represent the moments borne by the car body in the x direction, the y direction and the z direction;
through the measurement and calculation, the load condition of the vehicle body in six degrees of freedom is obtained.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (6)
1. A passenger car body six-degree-of-freedom load testing and calculating method is characterized by comprising the following steps:
A. a plurality of three-component force sensors are arranged at the supporting point of a vehicle body suspension to form an array system so as to determine the six-degree-of-freedom load condition at the supporting point of the suspension of the tested object;
B. connecting a 12V power supply with a plurality of three-component force sensors to supply power to the sensors;
C. connecting a data acquisition instrument with the three-component force sensor for acquiring sensor signals;
D. acquiring data of the three-component force sensor array system in an automobile test field according to test specifications to obtain the six-degree-of-freedom load at the corresponding position of an automobile body;
E. three forces obtained by measurement are brought into the following stress calculation mathematical model for calculation to obtain the stress of three degrees of freedom of the vehicle body;
Fx＝fxA+fxB+fxC+fxD
Fy＝fyA+fyB+fyC+fyD
Fz＝fzA+fzB+fzC+fzD
wherein the content of the first and second substances,
fxA、fxB、fxC、fxDrespectively represents the stress of the X direction of the point A, the point B, the point C and the point D,
fyA、fyB、fyC、fyDrespectively represents the stress of the Y direction of the point A, the point B, the point C and the point D,
fzA、fzB、fzC、fzDrespectively represents the stress of the point A, the point B, the point C and the point D in the z direction,
fx, Fy and Fz respectively represent stress of the car body in the x direction, the y direction and the z direction;
F. substituting the three measured moments into the following moment calculation mathematical model for calculation to obtain three-degree-of-freedom moments of the vehicle body;
wherein, L represents the distance between the point A and the point C, W represents the distance between the point A and the point B, and Mx, My and Mz respectively represent the moments borne by the vehicle body in the directions of x, y and z; and finally, obtaining the six-degree-of-freedom load condition borne by the vehicle body.
2. The six-degree-of-freedom load testing and calculating method for the passenger car body as claimed in claim 1, wherein the six-degree-of-freedom load testing and calculating method comprises the following steps: and step A, the three-component force sensor is respectively connected to the suspension fulcrum of the vehicle body through bolts.
3. The six-degree-of-freedom load testing and calculating method for the passenger car body as claimed in claim 1, wherein the six-degree-of-freedom load testing and calculating method comprises the following steps: and step A, four trisection force sensors are arranged.
4. The six-degree-of-freedom load testing and calculating method for the passenger car body as claimed in claim 3, wherein the six-degree-of-freedom load testing and calculating method comprises the following steps: and step A, the four three-component force sensors are respectively connected to the suspension fulcrum of the vehicle body through bolts.
5. The six-degree-of-freedom load testing and calculating method for the passenger car body as claimed in claim 1, wherein the six-degree-of-freedom load testing and calculating method comprises the following steps: and step B, connecting the 12V power supply with the three-component force sensor through wires.
6. The six-degree-of-freedom load testing and calculating method for the passenger car body as claimed in claim 1, wherein the six-degree-of-freedom load testing and calculating method comprises the following steps: and step C, the data acquisition instrument is connected with the three-component force sensor through a data line.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008067392A2 (en) * | 2006-11-28 | 2008-06-05 | The Timken Company | Load sensor and method of sensing a load |
| CN108489657A (en) * | 2018-05-24 | 2018-09-04 | 农业部南京农业机械化研究所 | Tractor trifilar suspension Spatial distributions machine load sensing device and its working method |
| CN109791094A (en) * | 2016-09-23 | 2019-05-21 | 西门子工业软件公司 | Method and system for the identification of efficient load |
| CN211477639U (en) * | 2020-01-19 | 2020-09-11 | 一汽解放汽车有限公司 | Force measuring device for suspension system of power assembly of commercial vehicle |
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- 2021-04-25 CN CN202110449412.3A patent/CN113188812A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008067392A2 (en) * | 2006-11-28 | 2008-06-05 | The Timken Company | Load sensor and method of sensing a load |
| CN109791094A (en) * | 2016-09-23 | 2019-05-21 | 西门子工业软件公司 | Method and system for the identification of efficient load |
| CN108489657A (en) * | 2018-05-24 | 2018-09-04 | 农业部南京农业机械化研究所 | Tractor trifilar suspension Spatial distributions machine load sensing device and its working method |
| CN211477639U (en) * | 2020-01-19 | 2020-09-11 | 一汽解放汽车有限公司 | Force measuring device for suspension system of power assembly of commercial vehicle |
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