CN106706960B - Falling test bed for checking acceleration sensor period and detection method - Google Patents
Falling test bed for checking acceleration sensor period and detection method Download PDFInfo
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- CN106706960B CN106706960B CN201611230379.0A CN201611230379A CN106706960B CN 106706960 B CN106706960 B CN 106706960B CN 201611230379 A CN201611230379 A CN 201611230379A CN 106706960 B CN106706960 B CN 106706960B
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- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
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Abstract
The invention provides a falling test bed for checking an acceleration sensor period, and relates to a falling test bed for detecting. The falling test stand comprises: the rack is used as a test support and falling platform; the falling component is used for installing the checked acceleration sensor and the standard acceleration sensor and driving the acceleration sensor and the standard acceleration sensor to perform free falling body movement; the lifting component is fixed at the rack and used for lifting the falling component; and the connecting mechanism is fixedly connected with the hoisting part and can be fixed or separated relative to the hoisting part. Only three parts of the rack, the lifting part and the falling part are needed, so that the detection precision and the corresponding effect of the acceleration measuring instrument with the manufacturing cost reaching millions of yuan in the prior art can be achieved. The structure is greatly simplified with respect to the prior art. So that the operation is convenient and the cost is low.
Description
Technical Field
The present invention relates to a drop test stand and a drop test method, and more particularly, to a drop test stand and a drop test method for checking an acceleration sensor during a period.
Background
An acceleration sensor is an electronic device capable of measuring acceleration forces. An acceleration force is a force that acts on an object during acceleration. The acceleration force may be a constant or a variable. Acceleration sensors are widely used to detect the motion state of various objects. Particularly for a vehicle collision test, in order to accurately detect various parameter indexes of a vehicle in the collision test process, a certain number of acceleration sensors are arranged in a collided vehicle of the vehicle collision test so as to effectively ensure that acceleration signals of the collided vehicle collected in each collision test are accurate and effective. Therefore, it is very important that the acceleration signal of the crashed vehicle from the acceleration sensor is accurate and effective.
At present, in order to ensure that the acceleration signal of the collided vehicle collected in each vehicle crash test is accurate and effective, the acceleration sensor is usually checked during two metering cycles, namely the period check is usually carried out. The period check of the existing acceleration sensor is directly detected by an accelerometer.
Because each accelerometer is manufactured in millions of dollars, it is generally not affordable to manufacturers performing vehicle crash tests. On the other hand, the accelerometer needs to measure the acceleration sensors one by one, and the acceleration sensors for vehicle crash test performing the period check usually reach hundreds, so the period check time is too long, and the crash test may be delayed.
Disclosure of Invention
The invention aims to provide a falling test bed and a detection method for checking an acceleration sensor during period, which aim to solve the problem of overhigh checking cost of the acceleration sensor during period in the prior art on the premise of effectively ensuring accurate detection.
A further object of the present invention is to improve the period checking efficiency of an acceleration sensor for a vehicle crash test, while effectively ensuring the detection accuracy, so as to shorten the period checking time.
In particular, the invention provides a crash test stand for verification during acceleration sensor testing, comprising:
the rack is used as a test support and falling platform;
the falling component is used for installing the checked acceleration sensor and the standard acceleration sensor and driving the acceleration sensor and the standard acceleration sensor to perform free falling body movement;
the lifting component is fixed at the rack and used for lifting the falling component;
the connecting mechanism is fixedly connected with the hoisting part and can be fixed or separated relative to the hoisting part;
the lifting part drives the connecting mechanism and the falling part to be located at any height of the rack, so that kinetic energy of the falling part before collision is adjustable and controllable, and the falling part is separated from the lifting part through the connecting mechanism to move in a free falling mode.
Further, the gantry includes:
a base for a fall platform;
four upright posts, wherein the rectangular angular points are arranged at the base and fixedly connected with the base, and are used for supporting the hoisting component, the connecting mechanism and the falling component;
the two longitudinal beams are correspondingly supported at the four upright posts and are longitudinally arranged in parallel;
and the cross beam is supported at the two longitudinal beams and used for installing a foundation of the hoisting part.
Further, the hoisting member comprises:
the electric hoist is fixed at the cross beam and used for providing lifting power; and
and the rope is connected between the electric hoist and the connecting mechanism and used for lifting the falling component.
Further, the connecting mechanism is an electromagnetic connecting mechanism, the electromagnetic mechanism is configured to be in a power-on state that the hoisting component is fixed with the falling component, and in a power-off state that the hoisting component is separated from the falling component;
optionally, the electromagnetic mechanism is an electromagnet.
Further, the fall component comprises:
the mounting bracket is matched with the connecting mechanism;
the sensor mounting plate is mounted in the mounting bracket and used for mounting the checked acceleration sensor and the standard acceleration sensor; and
and the pressing plate covers and is fixed above the sensor mounting plate and is used for fixing the checked acceleration sensor and the standard acceleration sensor at the sensor mounting plate.
Furthermore, a side plate surface of the sensor mounting plate is provided with a plurality of first groove bodies and a plurality of second groove bodies, the plurality of first groove bodies are arranged in parallel and used for placing a plurality of checked acceleration sensors and the standard acceleration sensors, and the plurality of second groove bodies are used for wiring the plurality of checked acceleration sensors;
the appearance of the acceleration sensor to be checked and the appearance of the standard acceleration sensor are of a convex structure, the protruding part of the convex structure is inserted into the corresponding first groove body, and two shoulders of the convex structure are matched with the top wall of the corresponding first groove body.
Further, the second groove body with first groove body is logical groove structure, and is many the second groove body forms into two and be parallel to each other and be the interval set up in sensor mounting panel central authorities department, the second groove body with first groove body mutually perpendicular sets up, the width of second groove body is wider than the width of first groove body.
The falling component is used for falling freely along the vertical direction;
optionally, the guide mechanism includes four guide rails correspondingly disposed at the rack, and four sliders provided at the falling member and correspondingly mounted at the four guide rails.
The device further comprises a buffer mechanism, wherein the buffer mechanism is used for enabling the amplitude of the acceleration generated by the falling component in the deceleration process to be adjustable;
optionally, a first soft component formed at the bottom of the falling component and a second soft component corresponding to the first soft component and disposed at the rack are included;
optionally, the first soft component is a columnar soft component arranged along the vertical direction, the bottom end of the first soft component is an arc surface, and the surface area of the second soft component is larger than the sectional area of the first soft component in the horizontal plane;
optionally, the first soft component is a rubber-based soft component, and the second soft component is a felt;
optionally, the second soft component is a plurality of layers, and the number of layers of the second soft component is set to adjust the acceleration amplitude of the falling component in the process of impacting the second soft component.
In addition, the invention also provides a detection method applying the falling test bed, which comprises the following steps:
s100, starting a standard acceleration sensor used as a reference and an acceleration sensor to be checked, and receiving and recording signals sent by the standard acceleration sensor and the acceleration sensor to be checked in real time;
s200, placing the standard acceleration sensor and the checked acceleration sensor at the same specified height relative to an impact plane;
s300, enabling the standard acceleration sensor and the checked acceleration sensor to simultaneously perform free-fall motion;
s400, comparing signals sent by the standard acceleration sensor and the checked acceleration sensor before and after the impact plane and when the impact plane is impacted, so as to judge the accuracy of the checked acceleration sensor;
optionally, the standard acceleration sensor is an acceleration sensor which is qualified in period checking or an acceleration sensor which is used for acquiring accurate acceleration signals of an acceleration moving object to be checked, and the checked acceleration sensor is used for acquiring the acceleration signals of the vehicle in a vehicle collision experiment;
optionally, the acquisition devices receiving and recording the standard acceleration sensor signal and the checked acceleration sensor signal are qualified to be debugged between S100 and S200.
The application discloses falling test bed utilizes the free fall principle, will be examined acceleration sensor and the acceleration sensor of standard install in the part department that falls. The lifting component lifts the falling component at any specified height relative to the rack through the connecting mechanism. And separating the falling part from the lifting part through the connecting mechanism. The time-period checking is carried out on the checked acceleration sensor by utilizing the free-falling body movement of the falling component and the acceleration of the collision with the rack when the falling component falls to the bottom of the rack. Therefore, only three parts, namely the rack, the lifting part and the falling part, are needed, so that the detection precision and the corresponding effect of the acceleration measuring instrument with the manufacturing cost of millions of elements in the prior art can be achieved. The structure is greatly simplified with respect to the prior art. So that the operation is convenient and the cost is low.
Further, since it is necessary to install hundreds of acceleration sensors simultaneously in a vehicle in a crash test, the number of acceleration sensors to be checked is enormous. In order to improve the efficiency of the period check thereof, it is necessary to install a plurality of acceleration sensors to be checked at the sensor mounting plate. In the present embodiment, the acceleration sensor to be inspected and the standard acceleration sensor have a convex outer shape. Many first cell bodies are parallel to each other and are used for laying a plurality of acceleration sensor that are checked. And then covering and fixing the sensor mounting plate by using a pressing plate, thereby completing the mounting and fixing of the plurality of checked acceleration sensors. Compared with the mode of independently fixing the bolts in the prior art, the installation and fixation time of a plurality of checked acceleration sensors is greatly shortened, and therefore the installation efficiency is greatly improved.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic front view of a crash test stand for verification during acceleration sensor testing in accordance with the present invention;
3 FIG. 3 2 3 is 3 a 3 schematic 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 section 3 line 3 A 3- 3 A 3 in 3 FIG. 3 1 3; 3
FIG. 3 is a schematic top view of the sensor mounting plate of the fall component;
FIG. 4 is a schematic front view of the sensor mounting plate shown in FIG. 3;
FIG. 5 is a schematic flow chart of the detection method applied to the drop test stand.
Detailed Description
First embodiment, fig. 1 is a schematic front view of a drop test stand for verification during acceleration sensor testing according to the invention, described in connection with fig. 1;
the crash test stand for checking during acceleration sensor of the present application may include: a rack 4, a hoisting member 2 and a falling member 1. The stand 4 serves as a test support and fall platform. The lifting component 2 is fixed at the rack 4, so that the kinetic energy of the falling component 1 before collision with the rack 4 can be adjusted and controlled. The falling component 1 can be fixed or separated relative to the lifting component 2 by the connecting mechanism 22. The falling component 1 can be located at any height relative to the gantry 4. The falling component 1 is used for mounting the acceleration sensor to be checked and a standard acceleration sensor and driving them to perform free-fall movement.
It should be noted that the greater the kinetic energy of the falling component 1, the wider the pulse width of the deceleration signal, given a constant peak value of the single peak signal of the acceleration sensor being checked during the fall of the falling component 1. Whereas the kinetic energy of the falling element 1 is determined by its height relative to the gantry 4. The falling component 1 can therefore be located at any height relative to the gantry 4.
The working process of the falling test stand is to mount the checked acceleration sensor and the standard acceleration sensor at the falling component 1. The lifting member 2 lifts the falling member 1 at an arbitrary designated height with respect to the gantry 4 through the connection mechanism 22. And separating the falling component 1 from the lifting component 2 through the connecting mechanism 22, and checking the checked acceleration sensor in the period by utilizing the free falling motion of the falling component 1 and the acceleration of the collision of the falling component 1 with the rack 4 when the falling component falls to the bottom of the rack 4.
The application discloses falling test bed utilizes the free fall principle, will be examined acceleration sensor and the acceleration sensor of standard install in the part 1 department that falls. The lifting member 2 lifts the falling member 1 at an arbitrary designated height with respect to the gantry 4 through the connection mechanism 22. The falling component 1 is separated from the lifting component 2 through the connecting mechanism 22. The acceleration sensor to be checked is checked for duration by the free-fall movement of the falling member 1 and the acceleration of the impact with the platform 4 when it falls to the bottom of the platform 4. Therefore, only three parts, namely the rack 4, the lifting part 2 and the falling part 1, are needed, so that the detection precision and the corresponding effect equivalent to an acceleration measuring instrument with the cost of millions of elements in the prior art can be achieved. The structure is greatly simplified with respect to the prior art. So that the operation is convenient and the cost is low.
3 second 3 embodiment 3, 3 fig. 3 2 3 is 3 a 3 schematic 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 a 3 sectional 3 line 3 a 3- 3 a 3 in 3 fig. 3 1 3, 3 and 3 is 3 described 3 with 3 reference 3 to 3 fig. 3 1 3 and 3 2 3; 3 The stage 4 includes: base, four stands 5, two longerons and crossbeam. The base serves as a fall platform. The corner points of the four upright posts 5 which are rectangular are arranged at the base and fixedly connected with the base. Four uprights 5 serve as supports. Two longitudinal beams are correspondingly supported at the four upright posts 5 and are arranged in parallel in the longitudinal direction. The cross beam is supported at the two longitudinal beams and used for installing a foundation of the hoisting component 2.
The rack 4 is composed of a base, four upright posts 5, two longitudinal beams and a cross beam, so that the rack 4 is simple in structure on the premise that the rack 4 can be used as a test support and a falling platform, and is convenient to manufacture, install and operate.
Technical features not disclosed in the present embodiment are the same as those of the first embodiment.
In a third embodiment, continuing with the description of fig. 1, the hoisting member 2 may include: an electric hoist and a rope 21. The electric hoist is fixed at the cross beam and used for providing lifting power. A rope 21 is connected between the electric hoist and the connection mechanism 22 for lifting the fall component 1.
The electric hoist is a general hoisting part and has the characteristics of easy purchase and convenient use.
Features not disclosed in this embodiment are the same as those in the first or second embodiment.
In the fourth embodiment, the connection mechanism 22 is an electromagnetic connection mechanism 22, which will be described with reference to fig. 1. The electromagnetic mechanism is configured to be in a power-on state that the lifting component 2 is fixed with the falling component 1, and in a power-off state that the lifting component 2 is separated from the falling component 1.
Alternatively, the electromagnetic mechanism may be an electromagnet.
The technical features not disclosed in this embodiment are the same as those of the first, second, or third embodiment.
Fifth embodiment, continuing with the description of fig. 1, the fall arrest device 1 may comprise: mounting bracket, sensor mounting plate 12, and pressure plate 13. The mounting bracket cooperates with the attachment mechanism 22. The sensor mounting plate 12 is mounted in a mounting bracket. The sensor mounting plate 12 is used for mounting the acceleration sensor to be checked and a standard acceleration sensor. The pressure plate 13 is covered and fixed above the sensor mounting plate 12, and the pressure plate 13 is used to fix the acceleration sensor to be checked and the standard acceleration sensor at the sensor mounting plate 12.
The technical features not disclosed in this embodiment are the same as those of the first, second, third, or fourth embodiment.
Sixth embodiment, fig. 3 is a schematic plan view of the sensor mounting plate of the fall component, and fig. 4 is a schematic front view of the sensor mounting plate shown in fig. 3, and the description will be given with reference to fig. 3 and 4. One side plate surface of the sensor mounting plate 12 is provided with a plurality of first grooves 121 and a plurality of second grooves. The first grooves 121 are disposed in parallel to each other and are used for receiving a plurality of acceleration sensors to be checked and a plurality of standard acceleration sensors. The second grooves are used for wiring the checked acceleration sensors. The checked acceleration sensor and the standard acceleration sensor are in a convex structure, the protruding part of the convex structure is inserted into the corresponding first groove 121, and two shoulders of the convex structure are matched with the top wall of the corresponding first groove 121.
When a vehicle is subjected to a collision test, hundreds of acceleration sensors need to be installed on the vehicle at the same time, so that the number of the acceleration sensors to be checked is large. In order to improve the efficiency of the period check thereof, it is necessary to mount a plurality of acceleration sensors to be checked at the sensor mounting plate 12. In the present embodiment, the acceleration sensor to be inspected and the standard acceleration sensor have a convex outer shape. The plurality of first grooves 121 are disposed in parallel to each other and are used to receive a plurality of acceleration sensors to be checked. And then, the pressure plate 13 is covered and fixed above the sensor mounting plate 12, thereby completing the mounting and fixing of the plurality of checked acceleration sensors. Compared with the mode of independently fixing the bolts in the prior art, the installation and fixation time of a plurality of checked acceleration sensors is greatly shortened, and therefore the installation efficiency is greatly improved.
Technical features not disclosed in this embodiment are the same as those of any of the first to fifth embodiments.
In the seventh embodiment, continuing to describe with reference to fig. 3 and 4, the second slot body and the first slot body 121 are both of a through slot structure. The plurality of second grooves are formed in two parallel and are arranged at the center of the sensor mounting plate 12 at intervals. The second groove body is perpendicular to the first groove body 121. The width of the second channel is wider than the width of the first channel 121. So as to facilitate the wiring of a plurality of checked acceleration sensors.
Technical features not disclosed in this embodiment are the same as those of any of the first to sixth embodiments.
In an eighth embodiment, continuing with the description of fig. 1 and 2, the drop test stand of the present application further includes a guide mechanism. The guide means are used to guide the falling component 1 in a free-falling movement in the vertical direction.
Alternatively, the guide mechanism includes four guide rails 3 provided at the stage 4 correspondingly, and four sliders 14 provided at the falling member 1 and mounted at the four guide rails correspondingly.
The guide mechanism is used for guiding, and the detection accuracy of the plurality of checked acceleration sensors is improved. Therefore, the consistency of the free-fall motion of the plurality of checked acceleration sensors at the same height is better.
Technical features not disclosed in this embodiment are the same as those of any of the first to seventh embodiments.
Ninth, continuing with the description of fig. 1 and 2, the drop test stand of the present application further includes a cushioning mechanism. The damping mechanism is used to adjust the amplitude of the acceleration generated by the falling component 1 during deceleration.
Technical features not disclosed in this embodiment are the same as those of any of the first to eighth embodiments.
In the tenth embodiment, continuing with the description of fig. 1, the cushioning mechanism includes the first soft material 11 formed at the bottom of the falling member 1, and the second soft material 41 provided at the stand 4 corresponding to the first soft material 11.
Technical features not disclosed in the present embodiment are the same as those in the ninth embodiment.
In the eleventh embodiment, the first soft material member 11 is a columnar soft material provided in the vertical direction, and the bottom end thereof is an arc surface, as will be described with reference to fig. 1. The surface area of second soft material 41 is larger than the cross-sectional area of first soft material 11 in the horizontal plane.
Technical features not disclosed in the present embodiment are the same as those in the ninth or tenth embodiment.
In the twelfth embodiment, the first soft material member 11 is a rubber-based soft material member, which is not shown in the drawings. Second soft component 41 is a felt pad.
The amplitude of the acceleration generated by the falling component 1 in the deceleration process can be adjusted, and the method is favorable for carrying out period verification on the verified acceleration sensor under different acceleration peak values.
The technical features not disclosed in this embodiment are the same as those of embodiment nine, ten, or eleven.
In embodiment thirteen, described with reference to fig. 1, second soft material member 41 has a plurality of layers. The number of layers of second soft component 41 is set to adjust the magnitude of the acceleration of falling component 1 during impact with second soft component 41. By adjusting the number of pieces of second soft component 41, the peak value of the single-peak signal collected by the acceleration sensor being checked is adjusted.
The technical features not disclosed in this embodiment are the same as those of the ninth, tenth, eleventh, or twelfth embodiment.
Fourteenth embodiment, in addition, the present application also provides a detection method of a drop test stand to which any of the first to thirteenth embodiments is applied, and fig. 5 is a schematic flow chart of the detection method applied to the drop test stand. As explained in conjunction with fig. 5, the detection method may include the steps of:
step one S100, starting a standard acceleration sensor used as a reference and an acceleration sensor to be checked, and receiving and recording signals sent by the standard acceleration sensor and the acceleration sensor to be checked in real time.
Step two S200, the standard acceleration sensor and the checked acceleration sensor are arranged at the same designated height relative to the impact plane.
Step three S300, the standard acceleration sensor and the checked acceleration sensor perform free falling body movement at the same time.
And step S400, comparing signals sent by the standard acceleration sensor and the acceleration sensor to be checked before and after the acceleration sensor collides with the plane and when the acceleration sensor collides with the plane, so as to judge the accuracy of the acceleration sensor to be checked.
The method comprises the steps of utilizing a gravity acceleration principle to carry out free falling in the process of impacting a standard acceleration sensor with an acceleration sensor to be checked to detect the acceleration value of the standard acceleration sensor when impacting a plane, then comparing the acceleration value of the standard acceleration sensor with the acceleration sensor to be checked to impact the front and back of the plane and the impact of the plane to judge the accuracy of the acceleration sensor to be checked, on one hand, accurately judging whether the acceleration sensor to be checked is qualified or not, on the other hand, the detection method can be realized only by utilizing the gravity acceleration principle, greatly simplifying the detection process compared with the existing corresponding detection method, and improving the detection efficiency. Meanwhile, corresponding detection equipment is simplified, and therefore detection cost is reduced.
Features not disclosed in this embodiment are the same as those in embodiment thirteen.
Fifteenth embodiment, continuing with the description of fig. 5, the standard acceleration sensor is an acceleration sensor for checking the passing acceleration or an acceleration sensor for collecting the accurate acceleration signal of the acceleration moving object to be checked. The checked acceleration sensor is used for collecting an acceleration signal of the vehicle in a vehicle collision experiment. The accuracy of detection is guaranteed.
Features not disclosed in the present embodiment are the same as those of the fourteenth embodiment.
Sixthly, continuing with the description of fig. 5, the acquiring device that receives and records the standard acceleration sensor signal and the checked acceleration sensor signal is qualified to debug between the first step S100 and the second step S200. To further ensure the accuracy of the detection.
The technical features not disclosed in the present embodiment are the same as those in the fifteenth embodiment.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (15)
1. A drop test stand for verification during acceleration sensor testing, comprising:
the rack is used as a test support and falling platform;
the falling component is used for installing the checked acceleration sensor and the standard acceleration sensor and driving the acceleration sensor and the standard acceleration sensor to perform free falling body movement;
the lifting component is fixed at the rack and used for lifting the falling component;
the connecting mechanism is fixedly connected with the hoisting part and can be fixed or separated relative to the hoisting part;
the lifting part drives the connecting mechanism and the falling part to be positioned at any height of the rack, so that the kinetic energy of the falling part before collision is adjustable and controllable, and the falling part is separated from the lifting part through the connecting mechanism to perform free falling motion;
the falling component comprises a sensor mounting plate which is arranged in the mounting bracket and is used for mounting the checked acceleration sensor and the standard acceleration sensor; the fall component further comprises:
the mounting bracket is matched with the connecting mechanism; and
the pressure plate covers and is fixed above the sensor mounting plate and is used for fixing the checked acceleration sensor and the standard acceleration sensor at the sensor mounting plate;
the sensor mounting plate is characterized in that a plate surface on one side of the sensor mounting plate is provided with a plurality of first groove bodies and a plurality of second groove bodies, the first groove bodies are arranged in parallel and used for placing a plurality of checked acceleration sensors and the standard acceleration sensors, and the second groove bodies are used for wiring the plurality of checked acceleration sensors;
the second tank body and the first tank body are both in a through groove structure, the plurality of second tank bodies are formed into two parallel grooves and are arranged in the center of the sensor mounting plate at intervals, the second tank bodies and the first tank bodies are arranged perpendicular to each other, and the width of each second tank body is wider than that of the corresponding first tank body;
the appearance of the acceleration sensor to be checked and the appearance of the standard acceleration sensor are of a convex structure, the protruding part of the convex structure is inserted into the corresponding first groove body, and two shoulders of the convex structure are matched with the top wall of the corresponding first groove body.
2. The drop test stand of claim 1, wherein the stand comprises:
a base for a fall platform;
four upright posts, wherein the rectangular angular points are arranged at the base and fixedly connected with the base, and are used for supporting the hoisting component, the connecting mechanism and the falling component;
the two longitudinal beams are correspondingly supported at the four upright posts and are longitudinally arranged in parallel;
and the cross beam is supported at the two longitudinal beams and used for installing a foundation of the hoisting part.
3. The crash test stand of claim 2, wherein said lifting member comprises:
the electric hoist is fixed at the cross beam and used for providing lifting power; and
and the rope is connected between the electric hoist and the connecting mechanism and used for lifting the falling component.
4. The crash test stand of any one of claims 1-3, wherein said attachment mechanism is an electromagnetic attachment mechanism configured to be energized with said lifting member secured to said falling member and de-energized with said lifting member separated from said falling member.
5. The drop test stand of claim 4, wherein the electromagnetic coupling mechanism is an electromagnet.
6. The drop test stand of any of claims 1-3 and 5, further comprising a guide mechanism for guiding the drop component in free-fall motion in a vertical direction.
7. The drop test stand of claim 6, wherein the guide mechanism comprises four guide rails disposed at the platform, and four sliders disposed at the drop component and mounted at the four guide rails.
8. The crash test stand of any of claims 1-3 and 5, further comprising a damping mechanism for providing an adjustable magnitude of acceleration generated by the crash component during deceleration.
9. The drop test stand of claim 8, wherein the cushioning mechanism comprises a first soft component formed at a bottom of the drop component, and a second soft component corresponding to the first soft component and disposed at the stand.
10. The drop test stand of claim 9, wherein the first soft component is a cylindrical soft component disposed in a vertical direction, a bottom end of the cylindrical soft component is a circular arc surface, and a surface area of the second soft component is larger than a cross-sectional area of the first soft component in a horizontal plane.
11. The drop test stand of claim 9, wherein the first soft component is a rubber-like soft component and the second soft component is a felt pad.
12. The drop test stand of claim 9, wherein the second soft component is multi-layered, and wherein the number of layers of the second soft component is arranged to adjust the magnitude of acceleration of the drop component during impact with the second soft component.
13. The test method applied to the drop test stand of any one of claims 1-12, comprising the steps of:
s100, starting a standard acceleration sensor used as a reference and an acceleration sensor to be checked, and receiving and recording signals sent by the standard acceleration sensor and the acceleration sensor to be checked in real time;
s200, placing the standard acceleration sensor and the checked acceleration sensor at the same specified height relative to an impact plane;
s300, enabling the standard acceleration sensor and the checked acceleration sensor to simultaneously perform free-fall motion;
s400, signals sent by the standard acceleration sensor and the checked acceleration sensor before and after the impact plane and when the impact plane is impacted are compared, so that the accuracy of the checked acceleration sensor is judged.
14. The detection method according to claim 13, wherein the standard acceleration sensor is an acceleration sensor for checking the passing of acceleration signals or an acceleration sensor for collecting accurate acceleration signals of an acceleration moving object, and the checked acceleration sensor is used for collecting the acceleration signals of the vehicle in a vehicle collision experiment.
15. The detection method according to claim 13, characterized in that the acquisition devices receiving and recording the standard acceleration sensor signal and the checked acceleration sensor signal are qualified between S100 and S200.
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| CN108344882B (en) * | 2018-01-22 | 2020-11-06 | 浙江大学 | Positive step gravity acceleration generating device |
| CN108254589B (en) * | 2018-01-22 | 2020-11-06 | 浙江大学 | Positive step gravity acceleration generating device |
| CN109470888B (en) * | 2018-12-05 | 2020-10-27 | 西北工业大学 | Calibration system and calibration method of high-g-value accelerometer based on deep learning |
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