CN114486073A - Rotational inertia measuring equipment and measuring method for collision dummy - Google Patents
Rotational inertia measuring equipment and measuring method for collision dummy Download PDFInfo
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- CN114486073A CN114486073A CN202210357098.0A CN202210357098A CN114486073A CN 114486073 A CN114486073 A CN 114486073A CN 202210357098 A CN202210357098 A CN 202210357098A CN 114486073 A CN114486073 A CN 114486073A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/10—Determining the moment of inertia
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/08—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving optical means for indicating
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
The invention relates to the field of rotational inertia measurement, in particular to rotational inertia measurement equipment and a rotational inertia measurement method for a collision dummy. The rotational inertia measuring equipment comprises a base, a rotary table system, a torsional pendulum period acquisition system and a torsional pendulum motion system, wherein the rotary table system is arranged above the base, the torsional pendulum period acquisition system and the torsional pendulum motion system are arranged below the base, the rotary table system is sequentially connected with the torsional pendulum motion system, and the rotary table system is also connected with the torsional pendulum motion system. The device and the method can measure the rotational inertia under the condition of rotating for a plurality of small angles, and the safety and the stability of the measuring process are improved.
Description
Technical Field
The invention relates to the field of rotational inertia measurement, in particular to rotational inertia measurement equipment and a rotational inertia measurement method for a collision dummy.
Background
With the year-by-year increase of automobile reserves in China, traffic accidents are also increased sharply. The automobile passive safety testing technology is an important testing means for verifying an automobile occupant protection system, wherein a collision testing dummy is necessary measuring equipment in an automobile passive safety test, and the reasonability of the design of an automobile occupant restraint system can be accurately evaluated through a measuring value reflected by the collision dummy.
After the collision test dummy is tested for many times, the self rotary inertia parameters of the collision test dummy can be influenced by damage and dislocation generated inside parts in the collision process, the existing collision dummy calibration technology cannot calibrate the quality characteristic parameters such as the rotary inertia of the collision test dummy, and meanwhile, the internal damage, the installation dislocation and the like are difficult to find visually in appearance, so that the inaccuracy of the collision test can be caused.
Therefore, it is necessary to develop a device and a method for measuring rotational inertia of a collision dummy, which are used for measuring and calibrating the rotational inertia of each structural assembly of the collision dummy after the collision dummy replaces spare parts or performs a certain number of tests, so as to ensure the accuracy of the parameters of the collision dummy and improve the effectiveness of the collision test. The existing rotational inertia measuring equipment used in other fields mostly needs to rotate a product by two 90 degrees completely for measurement, and when a large part is measured, the method can not ensure the safety and stability of the measuring process, and simultaneously improves the complexity of assembling and disassembling the equipment.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a rotational inertia measuring device and a rotational inertia measuring method for a collision dummy, which can measure the rotational inertia under the condition of rotating for a plurality of small angles and improve the safety and the stability of the measuring process.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a rotational inertia measuring device for a collision dummy, which comprises a base, a turntable system, a torsional pendulum period acquisition system and a torsional pendulum movement system, wherein the turntable system is arranged above the base, the torsional pendulum period acquisition system and the torsional pendulum movement system are both arranged below the base, the turntable system, the torsional pendulum period acquisition system and the torsional pendulum movement system are sequentially connected, and the turntable system is further connected with the torsional pendulum movement system.
Furthermore, the torsional pendulum motion system comprises a lifting control motor, a torsional pendulum control motor, a lifting module, a torsional pendulum shaft, a first torsional pendulum clutch mechanism and a second torsional pendulum clutch mechanism;
the lifting control motor, the lifting module, the torsional pendulum control motor and the first torsional pendulum clutch mechanism are sequentially connected, the second torsional pendulum clutch mechanism is connected with a torsional pendulum shaft, and the torsional pendulum shaft is also respectively connected with the torsional pendulum period acquisition system and the turntable system;
the first torsion swing clutch mechanism can be meshed with and separated from the second torsion swing clutch mechanism under the driving of the torsion swing control motor and the lifting module.
Furthermore, a torsional pendulum clutch spring is arranged above the second torsional pendulum clutch mechanism and is in a compressed state.
Further, the diameter of the upper end of the torsion pendulum shaft is larger than that of the lower end.
Further, the torsional pendulum period acquisition system comprises a torsional pendulum wire wheel, a first torsional pendulum spring, a second torsional pendulum spring, a torsional pendulum connecting wire, a photoelectric sensor and a shading sheet;
the torsional pendulum wire wheel is connected with the torsional pendulum motion system;
the torsional pendulum connecting wire is wound on the torsional pendulum wire wheel, and two ends of the torsional pendulum connecting wire are respectively connected with the first torsional pendulum spring and the second torsional pendulum spring;
one end of the shading sheet is connected with the torsional cycloid wheel, and the other end of the shading sheet is placed between the electro-optical doors of the photoelectric sensor.
Further, the turntable system comprises a mounting bottom plate, and a first turntable control motor, a first rotating shaft, a tool mounting plate, a first turntable motor support, a second rotating shaft and a second turntable control motor which are arranged above the mounting bottom plate; the mounting bottom plate is connected with the torsional pendulum motion system;
the second rotating shaft is respectively connected with the second rotary table control motor and the first rotary table motor support;
first revolving stage control motor and first pivot set up on first revolving stage motor support, and first pivot links to each other with first revolving stage control motor and frock mounting panel respectively.
In a second aspect, the invention provides a rotational inertia measuring method, which adopts the rotational inertia measuring device for the collision dummy to measure the rotational inertia of a product to be measured.
Further, the method comprises:
measuring the torsional pendulum period T under the set torsional pendulum angle and the set rotation angle when the measuring equipment is in no-load0；
After a product to be measured is measured and installed on the measuring equipment, a torsional pendulum period T under a torsional pendulum angle and a rotation angle is setS；
According to the torsional pendulum period T0The torsional period TSAnd the set rotation angle, and calculating the rotational inertia of each shaft of the product to be measured;
and the set rotating angle is an axial included angle between each shaft and the torsion pendulum shaft in the tool mounting plate coordinate system.
Further, the period T of the torsional pendulum is determined according to0The torsional period TSAnd the set rotation angle, and the calculation of the rotational inertia of each axis of the product to be measured comprises the following steps:
according to the torsional pendulum period T0And said period of torsional oscillation TSCalculating the integral moment of inertia;
and calculating the rotational inertia of each axis of the product to be detected according to the rotational inertia and the included angle.
Further, the set rotation angles are at least 6.
Compared with the prior art, the invention has the beneficial effects that:
the rotational inertia measuring equipment for the collision dummy provided by the invention adopts the torsional pendulum motion system to realize the effect of driving the product to be measured to generate torsional pendulum motion, adopts the torsional pendulum period acquisition system to acquire the torsional pendulum period of the product to be measured and the equipment under no load, and adopts the turntable system to realize the rotation of the product to be measured. When the equipment is used for measuring the rotational inertia of a product to be measured, the product does not need to be rotated by two 90 degrees for measurement, the torsional pendulum motion and the rotation are combined, when the product to be measured rotates at different angles, the rotational inertia of each axis of the product to be measured is calculated through two modes, namely the torsional pendulum period based mode and the rotation angle based mode, and then the multi-axis rotational inertia of the product to be measured is obtained. The device is compact in structure, can finish the measurement of the rotational inertia under the condition of small rotation angle when a product to be measured is installed at one time, can greatly improve the safety and stability of the measurement especially when the weight or the volume of the product to be measured is larger, is not only suitable for the measurement of each assembly of a collision dummy, but also can realize the integrated measurement of a plurality of assemblies, and can be applied to other fields needing to measure the rotational inertia.
The rotational inertia measuring method provided by the invention adopts the rotational inertia measuring device for the collision dummy to measure, thereby having at least the same advantages as the device. Specifically, after the no-load of the measuring equipment and the installation of the product to be measured are respectively measured, a torsional pendulum angle and a torsional pendulum period under a set rotation angle are set, and then the rotation inertia of each shaft of the product to be measured is calculated according to the torsional pendulum period and the set rotation angle.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural view of a rotational inertia measuring apparatus for a crash dummy provided in embodiment 1;
FIG. 2 is an exploded schematic view of the rotational inertia measuring apparatus for a crash dummy provided in embodiment 1, except for the base;
FIG. 3 is an exploded view of the tooling mounting plate, the first turntable motor support, the second turntable control motor, the second spindle bearing, and the like;
fig. 4 is a flowchart of a rotational inertia measurement method provided in embodiment 2;
fig. 5 is a schematic diagram of xy axes in the coordinate system in example 2.
Icon: 1-a lifting control motor; 2-controlling the motor by twisting; 3-a torsional pendulum control motor support; 4-a first torsional pendulum clutch mechanism; 5-a second torsional pendulum clutch mechanism; 6-torsion pendulum clutch spring; 7-a twisted cycloid wheel; 8-a first torsional bearing; 9-torsion pendulum shaft; 10-a flange bearing seat; 11-a second torsional pendulum bearing; 12-mounting a base plate; 13-the first turntable controls the motor; 14-a first coupling; 15-a first rotating shaft; 16-a tooling mounting plate; 17-anchor ear; 18-a first turret motor support; 19-a first shaft bearing; 20-a second shaft bearing; 21-a second turntable motor support; 22-a second shaft; 23-a second coupling; 24-a second turret control motor; 25-a first torsion pendulum spring; 26-a photosensor; 27-a light shielding sheet; 28-a second torsion pendulum spring; 29-a twisted pendulum connection line; 30-a lifting module; 31-base.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Example 1
Referring to fig. 1 to 3, the present embodiment provides a rotational inertia measurement device for a collision dummy, including a base 31, a turntable system, a torsional pendulum period acquisition system, and a torsional pendulum movement system, where the turntable system is disposed above the base 31, the torsional pendulum period acquisition system and the torsional pendulum movement system are both disposed below the base 31, the turntable system, the torsional pendulum period acquisition system, and the torsional pendulum movement system are sequentially connected, and the turntable system is further connected to the torsional pendulum movement system.
In a preferred embodiment, the torsional pendulum motion system comprises a lifting control motor 1, a torsional pendulum control motor 2, a lifting module 30, a torsional pendulum shaft 9, a first torsional pendulum clutch mechanism 4 and a second torsional pendulum clutch mechanism 5;
the lifting control motor 1, the lifting module 30, the torsional pendulum control motor 2 and the first torsional pendulum clutch mechanism 4 are sequentially connected, the second torsional pendulum clutch mechanism 5 is connected with the torsional pendulum shaft 9, and the torsional pendulum shaft 9 is also respectively connected with the torsional pendulum period acquisition system and the turntable system;
the first torsional pendulum clutch mechanism 4 can be engaged with and disengaged from the second torsional pendulum clutch mechanism 5 under the driving of the torsional pendulum control motor 2 and the lifting module 30.
In the above structure, the lifting module 30 can move axially along the torsional pendulum shaft 9 under the control of the lifting control motor 1, and then drives the torsional pendulum control motor 2 and the first torsional pendulum clutch mechanism 4 to move axially. Optionally, the torsional pendulum control motor 2 is mounted on the sliding block of the lifting module 30 through the torsional pendulum control motor bracket 3; the first torsion and swing clutch mechanism 4 is arranged on a motor shaft of the torsion and swing control motor 2 through a jackscrew; the second torsion pendulum clutch mechanism 5 is mounted on a torsion pendulum shaft 9 by splines. When the equipment needs to be twisted, a system consisting of the first torsion and swing clutch mechanism and the torsion and swing control motor moves upwards under the driving of the sliding block, the lifting module and the lifting control motor until the first torsion and swing clutch mechanism is meshed with the second torsion and swing clutch mechanism; the second torsional pendulum clutch mechanism can slide up and down along the spline to ensure that the second torsional pendulum clutch mechanism can move upwards under the action of the first torsional pendulum clutch mechanism until being engaged when the two clutch mechanisms are contacted but not engaged, so that the smoothness and the safety of the engagement process are ensured. When the torsional pendulum angle rotates in place and needs to be released, the first torsional pendulum clutch mechanism and the torsional pendulum control motor move downwards rapidly under the driving of the sliding block, the lifting module and the lifting control motor, and the release of the device is realized.
In a preferred embodiment, a torsion pendulum clutch spring 6 is also arranged above the second torsion pendulum clutch 5, the torsion pendulum clutch spring 6 being in a compressed state. The torsional pendulum clutch spring is in a compressed state, so that the second torsional pendulum clutch mechanism can generate downward pressure along the axial direction of the torsional pendulum shaft, and the two clutch mechanisms are always fastened after being meshed.
Optionally, the lifting control motor 1 and the torsion control motor 2 adopt 42 stepping motors.
The device is a torsional pendulum power source and a release device. The lifting control motor 1, the torsional pendulum control motor 2, the torsional pendulum control motor support 3, the first torsional pendulum clutch mechanism 4, the second torsional pendulum clutch mechanism 5, the torsional pendulum clutch spring 6, and the lifting module 30 are called torsional pendulum power source and release device.
In a preferred embodiment, the diameter of the upper end of the torsion pendulum shaft 9 is greater than the diameter of the lower end. Because the torsion pendulum shaft is connected with a torsion pendulum period acquisition system, particularly a rotary table system, the diameter of the upper end of the torsion pendulum shaft is larger than that of the lower end of the torsion pendulum shaft, so that the stability of the whole equipment can be improved.
In a preferred embodiment, the torsional period acquisition system comprises a torsional pendulum wheel 7, a first torsional pendulum spring 25, a second torsional pendulum spring 28, a torsional pendulum connection line 29, a photoelectric sensor 26 and a light shield 27;
the torsional pendulum wire wheel 7 is connected with the torsional pendulum motion system;
the torsional pendulum connecting wire 29 is wound on the torsional pendulum wire wheel 7, and two ends of the torsional pendulum connecting wire 29 are respectively connected with the first torsional pendulum spring 25 and the second torsional pendulum spring 28;
one end of the light shielding sheet 27 is connected to the twisted wire wheel 7, and the other end is placed between the electro-optical gates of the photoelectric sensor 26.
When the torsional pendulum wheel 7 rotates by a certain angle, the length difference is generated between the first torsional pendulum spring 25 and the second torsional pendulum spring 28, so that certain elastic potential energy is stored, when a torsional pendulum power source and the releasing device are released, the device can do periodic torsional pendulum motion under the action of the elastic potential energy, and the torsional pendulum angle is +/-15 degrees.
Optionally, the torsion pendulum wheel 7 is fixedly connected to the torsion pendulum shaft 9 via a top thread. One end of the light shielding sheet is fixed on the torsion cycloidal gear 7 through a bolt, and the other end is placed between the photoelectric doors of the photoelectric sensor 26.
Further, the first torsion spring 25 and the second torsion spring 28 are also each connected to the base 31.
In a preferred embodiment, the turntable system comprises a mounting base plate 12, and a first turntable control motor 13, a first rotating shaft 15, a tool mounting plate 16, a first turntable motor bracket 18, a second rotating shaft 22 and a second turntable control motor 24 which are arranged above the mounting base plate 12; the mounting base plate 12 is connected with the torsional pendulum motion system;
the second rotating shaft 22 is respectively connected with the second rotary table control motor 24 and the first rotary table motor support 18;
first revolving stage control motor 13 and first pivot 15 set up on first revolving stage motor support 18, and first pivot 15 links to each other with first revolving stage control motor 13 and frock mounting panel 16 respectively.
The mounting plate in this structure is used for placing the first revolving stage control motor of its top, second revolving stage control motor, frock mounting panel etc. and it links to each other with the pendulum motion system, the pendulum motion of self is realized to the pendulum of turning round through the pendulum motion system, the frock mounting panel is used for installing the product that awaits measuring (like dummy's assembly, including head assembly, chest assembly, neck assembly, left upper arm assembly, right upper arm assembly, left lower arm assembly, right lower arm assembly, left hand portion assembly, right hand portion assembly, buttock assembly, left thigh assembly, right thigh assembly, left shank assembly, right shank assembly, left foot portion assembly, right foot portion assembly). Because first revolving stage motor support is connected with the second pivot, consequently under the drive of second revolving stage control motor, first revolving stage motor support can rotate certain angle, and then drives the rotation of frock mounting panel and the product that awaits measuring on it. Wherein, the frock mounting panel can a plurality of products that await measuring of adaptation. The tool mounting plate can rotate by 0-45 degrees under the control of the two rotary table motors.
Alternatively, the second rotary shaft 22 and the second turntable control motor 24 are both disposed on a second turntable motor support 21, and the second turntable motor support 21 is connected to the mounting base plate 12, preferably by bolts.
Optionally, two second rotating shaft bearings 20 are installed at the bearing positions of the second turntable motor support 21, the second rotating shaft 22 is installed through the second rotating shaft bearings 20, and the second turntable control motor 24 is connected with the second rotating shaft 22 through a coupler.
Optionally, the turntable system further includes a first coupler 14 and a second coupler 23, one end of the first coupler 14 is fixed on the first rotating shaft 15, and the other end is fixedly connected with a motor shaft of the first turntable control motor 13; one end of the second coupling 23 is fixed to the second rotating shaft 22, and the other end is fixedly connected to a motor shaft of the second turntable control motor 24.
Optionally, the first rotary table motor support 18 is connected with the second rotary shaft 22 through a jackscrew, two first rotary shaft bearings 19 are installed at the bearing positions of the first rotary table motor support 18, the first rotary shaft 15 is installed by penetrating through the first rotary shaft bearings 19, and the tool installation plate 16 is connected with the first rotary shaft 15 through the hoop 17.
Alternatively, the flange bearing housing 10 is connected to the base 31 by bolts; the flange bearing seat 10 is internally provided with a first torsion pendulum bearing 8 and a second torsion pendulum bearing 11, and the torsion pendulum shaft 9 passes through the first torsion pendulum bearing 8 and the second torsion pendulum bearing 11 and then is connected with a mounting base plate 12.
Example 2
As shown in fig. 4, the present embodiment provides a rotational inertia measuring method which performs measurement using the rotational inertia measuring apparatus for a crash dummy of embodiment 1, including the steps of:
s110, measuring the torsion period T under the torsion angle setting and the rotation angle setting when the measuring equipment is in no-load0。
The no-load condition refers to the condition that a product to be tested is not mounted on the tooling mounting plate. The set torsional pendulum angle is a rotation angle of the torsional pendulum shaft. The set rotation angle refers to an included angle between each shaft in the tool mounting plate coordinate system and the axial direction of the torsion pendulum shaft.
Alternatively, as shown in fig. 5, the tool mounting plate coordinate system uses the center of the tool mounting plate as an origin (when the tool mounting plate is circular, the origin is the center of the circle), the normal direction of the plane of the tool mounting plate is the z-axis of the coordinate system, the axial direction of the first rotating shaft is the x-axis of the coordinate system, and the axial direction of the second rotating shaft is the y-axis of the coordinate system.
S120, after the product to be measured is installed on the measuring equipment, setting the torsional pendulum angle and setting the torsional pendulum period T under the rotation angleS。
Illustratively, before measuring the rotational inertia, the first platform control motor 13 is controlled to make the z axis of the coordinate system coincide with the vertical direction, the device is released after being rotated to a specified torsional pendulum angle by controlling the power source and the releasing device, and the torsional pendulum period T is measured01And recording; then keeping the second rotary table control motor 24 still and only controlling the first rotary table control motor 13 to rotate, so that the tool mounting plate rotates along the x axis by two angles alpha1、α2Each angle is in placeRepeating the torsion pendulum releasing process and measuring the no-load period T02And T03(ii) a The first rotary table control motor 13 is returned, and the second rotary table control motor 24 is controlled to rotate along the y axis by two angles beta1、β2After each angle is in place, the torsion pendulum releasing process is repeated, and the no-load period T is measured04And T05。
Installing the dummy assembly on the tool installation plate, repeating the process, and measuring the loading period TS1、TS2、TS3、TS4、TS5。
S130, according to the torsional pendulum period T0The torsional period TSAnd setting the rotation angle, and calculating the rotational inertia of each shaft of the product to be measured.
Preferably, said period T according to said torsion pendulum0The torsional period TSAnd the set rotation angle, and the calculation of the rotational inertia of each axis of the product to be measured comprises the following steps:
according to the torsional pendulum period T0And said period of torsional oscillation TSCalculating the integral moment of inertia;
and calculating the rotational inertia of each axis of the product to be detected according to the rotational inertia and the included angle.
Illustratively, the integral moment of inertia IdCalculated using the following formula
And K is the equivalent stiffness coefficient of the first torsion spring and the second torsion spring, and the equivalent stiffness coefficient is the comprehensive stiffness coefficient considering error factors such as air damping and the like. K needs to be calibrated by a standard body before measurement. After the torsional oscillation period is acquired, five rotational inertias I under five states can be calculated according to the formulad1、Id2、Id3、Id4、Id5。
Further according to Id=Ixxcos2α+ Iyycos2β+Izzcos2γ-2Iyzcosβcosγ-2Ixzcosαcosγ-2Ixycos α cos β; it is composed ofIn the coordinate system, alpha, beta and gamma are respectively included angles between x, y and z axes and the axial direction of the torsion pendulum shaft; i isxx、Iyy、IzzRespectively the rotational inertia of the x, y and z axes of the product to be measured, Iyz、Ixz、IxyAre the products of inertia in the x, y, z axes, respectively.
The rotational inertia I of each shaft can be solved according to the following formulaxx、Iyy、Izz。
To simplify the calculation process, let α =90 °, β =90 °, γ =0 °, we can obtain formula one; let α =90 °, rotate by an angle β about the y-axis shown in fig. 51And beta2Formulas two and three can be obtained; let β =90 °, rotate by an angle α around the x-axis shown in fig. 51And alpha2The formulas four and five can be obtained.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the technical solutions of the embodiments of the present invention.
Claims (7)
1. The rotational inertia measuring equipment for the collision dummy is characterized by comprising a base (31), a rotary table system, a torsional pendulum period collecting system and a torsional pendulum motion system, wherein the rotary table system is arranged above the base (31), the torsional pendulum period collecting system and the torsional pendulum motion system are both arranged below the base (31), the rotary table system, the torsional pendulum period collecting system and the torsional pendulum motion system are sequentially connected, and the rotary table system is also connected with the torsional pendulum motion system;
the torsional pendulum motion system comprises a lifting control motor (1), a torsional pendulum control motor (2), a lifting module (30), a torsional pendulum shaft (9), a first torsional pendulum clutch mechanism (4) and a second torsional pendulum clutch mechanism (5);
the lifting control motor (1), the lifting module (30), the torsional pendulum control motor (2) and the first torsional pendulum clutch mechanism (4) are sequentially connected, the second torsional pendulum clutch mechanism (5) is connected with the torsional pendulum shaft (9), and the torsional pendulum shaft (9) is also connected with the torsional pendulum period acquisition system and the turntable system;
the first torsion pendulum clutch mechanism (4) can be meshed with and separated from the second torsion pendulum clutch mechanism (5) under the driving of the torsion pendulum control motor (2) and the lifting module (30);
the torsional pendulum period acquisition system comprises a torsional pendulum wire wheel (7), a first torsional pendulum spring (25), a second torsional pendulum spring (28), a torsional pendulum connecting wire (29), a photoelectric sensor (26) and a shading sheet (27);
the torsional pendulum wire wheel (7) is connected with the torsional pendulum motion system;
the torsional pendulum connecting wire (29) is wound on the torsional pendulum wire wheel (7), and two ends of the torsional pendulum connecting wire (29) are respectively connected with the first torsional pendulum spring (25) and the second torsional pendulum spring (28);
one end of the shading sheet (27) is connected with the torsional cycloid wheel (7), and the other end is placed between the electro-optical doors of the photoelectric sensor (26);
the rotary table system comprises a mounting bottom plate (12), and a first rotary table control motor (13), a first rotary shaft (15), a tool mounting plate (16), a first rotary table motor support (18), a second rotary shaft (22) and a second rotary table control motor (24) which are arranged above the mounting bottom plate (12); the mounting bottom plate (12) is connected with the torsional pendulum motion system;
the second rotating shaft (22) is connected with a second rotary table control motor (24) and a first rotary table motor support (18);
a first rotary table control motor (13) and a first rotary shaft (15) are arranged on a first rotary table motor support (18), and the first rotary shaft (15) is connected with the first rotary table control motor (13) and a tool mounting plate (16).
2. A rotary inertia measurement apparatus for a crash dummy according to claim 1, wherein a torsional pendulum clutch spring (6) is further provided above the second torsional pendulum clutch mechanism (5), the torsional pendulum clutch spring (6) being in a compressed state.
3. The rotational inertia measuring apparatus for a crash dummy according to claim 1, wherein a diameter of an upper end of the torsion pendulum shaft (9) is larger than a diameter of a lower end.
4. A rotational inertia measuring method, characterized in that the rotational inertia of a product to be measured is measured using the rotational inertia measuring apparatus for a crash dummy according to any one of claims 1 to 3.
5. A method of measuring rotational inertia according to claim 4, comprising:
measuring the torsional pendulum period T under the set torsional pendulum angle and the set rotation angle when the measuring equipment is in no-load0；
After a product to be measured is measured and installed on the measuring equipment, a torsional pendulum period T under a torsional pendulum angle and a rotation angle is setS；
According to the torsional pendulum circumferencePeriod T0The torsional period TSAnd the set rotation angle, calculating the rotation inertia of each shaft of the product to be measured;
and the set rotating angle is an axial included angle between each shaft and the torsion pendulum shaft in the tool mounting plate coordinate system.
6. A method of measuring rotational inertia according to claim 5, wherein the period T is determined according to the torsional pendulum period0The torsional period TSAnd the set rotation angle, and the calculation of the rotational inertia of each axis of the product to be measured comprises the following steps:
according to the torsional pendulum period T0And said period of torsional oscillation TSCalculating the integral moment of inertia;
and calculating the rotational inertia of each axis of the product to be detected according to the rotational inertia and the included angle.
7. A method of measuring rotational inertia according to claim 5 or 6, wherein the set rotational angles are at least 6.
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| CN116989944A (en) * | 2023-09-27 | 2023-11-03 | 晋中学院 | Automatic detector for hydrogen fuel cell leakage |
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Also Published As
| Publication number | Publication date |
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| GB202210120D0 (en) | 2022-08-24 |
| CN114486073B (en) | 2022-06-17 |
| GB2605737A (en) | 2022-10-12 |
| GB2605737B (en) | 2023-08-09 |
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