DE202015009480U1 - Prüfpendelanordnung - Google Patents

Abstract

A test pendulum assembly for performing crash test dummy certifications, comprising a test probe (4) suspended from a cable assembly (6), with test conditions normalized and a standard rope length (lN) provided, the cable assembly (6) comprising a suspension (Fig. 18.1, 18.2, 18.3, 18.4), wherein a first drive (10) for accelerating the test probe (4) and at least one second drive (24, 26) are provided for moving the suspension (18.1, 18.2, 18.3, 18.4), wherein the cable arrangement (6) has at least four cables (8.1, 8.2, 8.3, 8.4).

Description

A test pendulum arrangement and a method for operating the test pendulum arrangement will be described below. The Prüfpendelanordnung serves for the certification of crash test dummies and has a test probe, which is arranged hanging on a cable assembly.

Crash-test dummies are used by the automotive industry to test the safety of motor vehicles with respect to occupant protection in the event of accidents. For this purpose, various normalized crash tests are carried out, e.g. Frontal crashes, side crashes, rear crashes and rollover tests. The crash test dummies are placed in vehicles to be tested or otherwise positioned and performed the corresponding crash tests.

The crash test dummies used have a large number of sensors in order to be able to measure the impact of the crash on the crash test dummy. The sensors used are in many cases force sensors, displacement sensors and acceleration sensors. During the crash test, these accelerometers, penetrations, and forces are measured and recorded by these sensors. The measured data are then evaluated and the load is checked.

The crash test dummies should simulate people in their properties. This refers to dimensions, mobility, weight and the like. Because of this, crash test dummies are difficult to handle.

A crash test dummy must be regularly certified to ensure that it returns reliable values. The measuring chain made of mechanics Sensors of the crash test dummies must be checked for certification. For this purpose, a variety of different tests are needed.

Some of the tests provide that a test pendulum having a defined mass and suspended from a cable assembly of defined length is swung from a defined height against predetermined points of the crash test dummy. Such predetermined points are arranged, for example, on the hip, shoulders, sternum and head. The pendulum has a precisely determined momentum upon impact due to the known mass and the precisely defined pendulum motion. This precision is used to test the reaction of the sensors of the crash test dummy to the precisely determined pulse. Should a sensor output a value that is not within a narrow range of values, this indicates a defect in the sensor or mechanical components of the crash test dummy and the sensor or defective mechanical components are replaced. The certification of the crash test dummies ensures that the Crash Test Dummy measurement system supplies correct values with which the vehicle registration tests can be carried out and the targeted development of corresponding restraint systems is made possible.

Conventional certification facilities using the test probes described above are designed around the test pendulum. Depending on the test to be performed, the crash test dummy must be positioned exactly at a reference point determined by the test pendulum. For rooms with a low ceiling height, therefore, the height of the reference point is ergonomically unfavorable low. Due to the characteristics of the crash-test dummies, the size, the flexible limbs and the high weight of most crash-test dummies, especially the adult crash-test dummies, this work is physically very stressful for the personnel performing the tests. In addition, several tests must be performed on the test pendulum for the certification of a single crash test dummy, so that a crash test dummy for a certification must be repositioned several times. The positioning must be very precise to the reference point. This task is time consuming, so only a small number of certifications can be done per day. In addition, the crash test dummies are not available for crash testing during certification. The operation of a certification laboratory is necessary but uneconomical.

The DE 10 2014 002 526 A1 discloses a collision detection system and method for operating a collision detection system. The collision detection system comprises at least one component of a motor vehicle and at least one collision body, by means of which a collision between the motor vehicle and the collision body can be brought about, wherein a load application device is disclosed with a movable collision body, wherein the collision is provided as a result of the movement of the collision body, wherein a load application device is designed as a pendulum device, wherein the pendulum is adjustably deflectable, wherein a positioning device is provided which has a horizontal guide and / or a vertical guide with which the collision body with respect to the motor vehicle is horizontally and / or vertically movable and / or positionable ,

The test equipment required for the certification of crash test dummies, in particular the pendulum to be used, has a large space requirement, since the normalized cable length is large and the pendulum must be deflected over a large height. Construction and operation of corresponding crash test dummy certification facilities are therefore associated with complications. On the one hand, rooms with adequate dimensions must be provided, on the other hand, the facilities in the company against accidents, especially collisions with oscillating Prüfpendeln be hedged.

The object is thus to develop Prüfpendelanordnungen and methods for operating Prüfpendelanordnungen of the type mentioned in such a way that the space required to set up and operate a corresponding Prüfpendelanordnung fails lower, and that the reliability of appropriate Prüfpendelanordnungen can be produced with less effort.

The object is achieved by a Prüfpendelanordnung according to claim 1. Further embodiments of Prüfpendelanordnungen and the method for operating the Prüfpendelanordnung are the subject of the dependent claims.

In the following, a test pendulum arrangement for carrying out crash test dummy certifications is described which has a test probe suspended from a cable arrangement. The test conditions for carrying out the crash test dummy certification are standardized. Scaling is used to ensure the introduction of a precisely defined pulse into the crash test dummy, so that the values recorded by the crash test dummy's sensory can be related to a fixed quantity, the injected pulse. The standardized test conditions see u. a. a standard length of rope. Together with the likewise standardized properties of the test probe, an impulse of the test probe can thus be determined, which lies within very narrow tolerances and thus permits certification of the crash test dummy.

The cable assembly has a suspension, are fixed to the ropes of the cable assembly above the probe.

The Prüfpendelanordnung has a first drive to accelerate the probe. By using a first drive to accelerate the probe, the necessary acceleration travel to achieve a designated speed of the probe at the point of impact of the crash test dummy is shortened. This reduces the space required to install and operate a corresponding test pendulum assembly. The shorter acceleration path also makes it possible to significantly reduce the risk of collision with operating personnel, since the potential collision space in which the test probe and personnel can collide is lower.

Furthermore, at least a second drive is provided for the method of suspension. With the aid of the at least one second drive, the suspension can be moved together with the test probe. It can thereby be achieved that the cable arrangement always has the same cable tension during the acceleration of the test probe. As a result, oscillations of the pendulum can be avoided perpendicular to the desired direction of movement. In addition, the test probe can be linearly accelerated in this way, since the distance between pendulum and suspension can be kept constant. An acceleration of the pendulum on a circular path, as would be required for a fixed suspension of the cable arrangement, can thus be avoided. Acceleration on a circular path would make the design of the first drive more expensive and expensive. With the help of the appropriate Prüfpendelanordnung the required pulse of the probe can be achieved in a much smaller space than before with high precision and without unwanted side effects, such as vibrations in the cable arrangement or the like.

In addition, the cable arrangement has at least four cables to which the test probe is attached. The ropes can span a V in a view in the direction of acceleration of the test probe, whereby a centering of the test probe can be achieved and a tendency to lateral swinging is reduced.

In a first further refinement of the test pendulum arrangement, a control or regulation may be provided which serve to actuate the first drive and the at least one second drive. With the aid of a corresponding control or regulation, the first drive and the at least one second drive can thus be synchronized. Furthermore, it is possible to use different test probes, which may have, for example, different masses or different contours, since with the aid of a control or regulation corresponding parameters can be taken into account in the control of the drives.

The control allows a free definition of the pivot point of the cable suspension. This also makes it possible to dispense with a horizontal positioning of the crash test dummies with respect to a reference point and instead with the drives to touch the impact point of the dummies and process the control side.

According to another further aspect, the connection between the test probe and the cable arrangement can be detachable. You can do this be provided various closure systems, for example, quick release.

In another further embodiment, the first drive and the at least one second drive can be linear drives. Linear drives are very powerful and allow acceleration of high masses at short distances. For this reason, linear drives can also be decelerated very rapidly, which leads to a precise replication of the standardized test conditions. By using linear actuators, the necessary acceleration paths can be further reduced. As a result, the space required continues to decrease and the accident risk is further reduced.

The linear drives of the cable suspension can be designed, in particular, as ironless linear motor drives which have rails guided on rails. The carriages have low masses and thus keep the masses to be accelerated and braked low.

The first linear drive for the test probe can be designed in a possible embodiment as an iron-wound linear motor or as a toothed belt axis with servo drive. These drives are much more powerful, but also less dynamic than ironless linear motors. Since a precise stop point for the Prüfsondenbeschleunigung is not required, this circumstance does not play a practical role.

In a view transverse to the direction of acceleration of the test probe, the ropes can be parallel, whereby the test probe can be guided on a circular path. The distance of the suspension transversely to the direction of acceleration may correspond to the distance of the suspension points of the cables to the test probe. This results in trajectories of the ropes parallel offset orbits and a clean guidance of the probe is possible.

In each case a drive rail, in particular a rail of a linear drive, can be provided for the first track and for the second track. As a result, the number of necessary drives for the suspension is reduced.

A further, additional aspect provides that each cable has its own suspension, each suspension having its own drive carriage. By providing own drive carriages for each suspension, the masses of the cable suspension to be accelerated can be minimized, which increases the precision of the drive. Furthermore, a variable center distance of the test probe can be set and existing test probes with different distances can be used without any adjustments.

In a further development of the aforementioned embodiment, each drive slide may have a position transmitter, so that a control always has feedback about the current position of each drive slide, whereby the precision of the Prüfpendelanordnung can be further increased during operation.

Another further aspect of the test pendulum arrangement provides that the cable arrangement has a cable length which corresponds to a fraction of the cable standard length. The fraction may be a natural fraction or a non-natural fraction.

The provision of at least two drives also shorter cable lengths can be used as the standard rope length, which reduces the space requirement between a cable suspension and Prüfsondenauftreffpunkt the crash test dummy in the vertical direction. The corresponding test laboratories in which the test pendulum arrangement described here can be used can therefore have lower ceiling heights than test laboratories for known test pendulum arrangements, which facilitates the establishment of corresponding certification laboratories. The test probe can thus always be arranged in an ergonomic working height.

The at least one second drive can be controlled in the context of this embodiment so that a cable movement of a rope is simulated in standard length in the concrete suspension point. This can be easily determined from the known speed of the test probe at the point of impact with the aid of the radiation set.

In another further embodiment, the first drive can have a detachable connection to the test probe so that the test probe can be decoupled from the first drive. Thus, the test probe can be released from the first drive before it hits the crash test dummy. At the moment of impact, the test probe thus oscillates freely and in accordance with standards.

In a further possible embodiment, a cable connection between the first drive, in particular a carriage and the test probe can be provided. The length of the rope is dimensioned such that it allows at least an unimpeded first impact on the crash test dummy, but the test probe stops when returning the drive carriage. This eliminates operator exposure to a pendulum probe after impact with the crash test dummy and prevents damage to the tester if a test is improperly used, e.g. is performed without crash test dummy.

A first independent object described here relates to a method for operating a Prüfpendelanordnung according to the manner described above. It is provided that the test probe are accelerated by means of the first drive and the suspension by means of the at least one second drive, each with the same accelerations from the idle state, wherein the suspension is braked and wherein the test probe is decoupled from the first drive, so that the test probe freely oscillates. In this way, it is possible to accelerate the test probe precisely as a classical Prüfpendelanordnung, but with much less space. In particular, when using linear drives high positive and negative accelerations can be achieved so that the tolerances specified by the standard can be met.

The coupling device can be identical in construction according to one embodiment for all test probes. The coupling device can be retrofitted for existing probes.

verfahren werden. Dabei entsprechen v_A der Geschwindigkeit der Aufhängung, v_P der Geschwindigkeit der Prüfsonde im Auftreffpunkt, l_P der tatsächlichen Seillänge und l_N der Seilnormlänge. In a first further embodiment of the method, the suspension can after the decoupling of the test probe at a speed of

be moved. Where v _{A is} the speed of the suspension, v _{P is} the speed of the test probe at the point of impact, l _{P is} the actual cable length and l _{N is} the standard rope length.

If the actual rope length l _P corresponds to the rope standard length l _N , the speed of the suspension point is 0. At half standard rope length, the suspension speed must be equal to half the speed of the test probe. According to a further aspect of the method, it can be provided that the first drive is moved counter to an acceleration direction after the decoupling of the test probe. As a result, damage to the detachable connection of the first drive to the test probe can be prevented by a return-swinging test probe.

The full Prüfpendelanordnung can be moved back after a first impact with the crash test dummy at a distance to prevent a second impact on the usually fallen over crash test dummy.

Other objects, features and advantageous applications of the invention will become apparent from the following description of an embodiment with reference to the drawings. All described and / or illustrated features in their meaningful combination form the subject of the present invention, also independent of the claims and their back references. They show schematically:

1 a Prüfpendelanordnung according to a first embodiment;

2 a conventional test pendulum assembly of the prior art;

3 the Prüfpendelanordnung 1 at the time of triggering the test probe as well

4 a second embodiment of a test pendulum assembly with reduced cable length.

The same or equivalent components are provided in the following embodiments for better readability with the same reference numerals.

1 shows a perspective view of a Prüfpendelanordnung 2 according to a first embodiment.

The test pendulum arrangement 2 has a test probe 4 on that at a rope line up 6 is fixed.

The rope arrangement 6 has four ropes 8.1 to 8.4 on. When viewed in an acceleration direction B, the cables tension 8.1 and 8.4 such as 8.2 and 8.3 one V each. The ropes 8.1 to 8.4 are each at the test probe 4 established. The cables each have a standard length l _N.

The test probe 4 is on a first linear drive 10 arranged. The linear drive 10 has a rail 12 as well as one on the rail 12 guided sled 14 on. On the sledge 14 is a wedge 16 arranged at the test probe 4 is applied. Will the sled 14 accelerated in acceleration direction B, the wedge acts 16 with the test probe 4 and accelerates the test probe 4 ,

The ropes 8.1 to 8.4 are fixed at their upper end to suspensions, each as a drive carriage 18.1 to 18.4 are formed. The drive carriages 18.1 . 18.2 run on a first drive rail 20 a linear drive 22 , The drive carriages 18.3 . 18.4 run on a second drive rail 24 a linear drive 26 , The linear drives 10 . 22 and 26 or the drive carriage 14 and 18.1 to 18.4 be through a scheme 28 controlled. The regulation 28 become current location information of the respective drive carriage 14 and 18.1 to 18.4 transmitted. As a result, an exact position-time control can be made.

2 shows a Prüfpendelanordnung 102 from the prior art.

A test probe 104 is on a rope arrangement 106 arranged with standard length L _N. The test probe 104 becomes with tensioned ropes of the rope arrangement 106 lifted to a certain height and released to carry out the test. Gravity becomes the test probe 104 accelerates and reaches in the illustrated time at which a collision is to take place with the body to be tested, its predetermined speed, which is always the same due to the rope length and the given pendulum height.

3 shows the Prüfpendelanordnung 2 out 1 at a time after triggering.

In contrast to 1 has become the test probe 4 from the sled 14 solved and moves at a speed v _P forward. The drive carriages 18.1 to 18.4 move up to a point of impact of the test probe 4 at the same speed v _P forward. At the time of release thus has the test probe 4 the same kinetic state as the test probe 104 in 2 , To accelerate the test probe 4 However, only a fraction of the space was needed to accelerate the probe 104 necessary is. The traversed space of the test probe 4 is much lower than that of the test probe 104 from the prior art, so that a risk of collision of the test probe 4 is reduced with operating personnel.

The drive carriage 14 is accelerated against the direction of acceleration B corresponding to the probe velocity vector v _P to cause collision of the probe 4 after rebounding from a crash test dummy (not shown) and thereby avoiding a risk of damage.

4 shows a second embodiment of a corresponding Prüfpendelanordnung 2 ' ,

The test pendulum arrangement 2 ' has a rope length L _P , which is smaller than the standard rope length L _N of Prüfpendelanordnung 2 from the 1 and 2 ,

The suspensions or drive carriages 18.1 to 18.4 be in operation of the Prüfpendelanordnung 2 ' not braked to 0, but according to the jet set such that the drive slide 18.1 to 18.4 move as a rope of standard length l _N would do in the appropriate position. The speed of the drive carriages 18.1 to 18.4 thus results

In this way, the movements of a standard-length rope can be adjusted exactly.

LIST OF REFERENCE NUMBERS

2, 2 '

 Prüfpendelanordnung

4

probe

6

cable arrangement

8.1-8.4

ropes

10

First linear drive

12

rail

14

carriage

16

wedge

18.1-18.4

drive carriage

20

First drive rail

22

linear actuator

24

Second drive rail

26

linear actuator

28

regulation

102

Prüfpendelanordnung

104

probe

106

cable arrangement

Z

turning center

B

acceleration direction

l _N

Cable standard length

l _P

cable length

v _p

Prüfsondengeschwindigkeit

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102014002526 A1 [0008]

Claims (8)

Test pendulum assembly for performing crash test dummy certifications, with a test probe ( 4 ) attached to a cable arrangement ( 6 ), wherein test conditions are normalized and a standard length of rope (l _N ) is provided, the cable arrangement ( 6 ) a suspension ( 18.1 . 18.2 . 18.3 . 18.4 ), wherein a first drive ( 10 ) for accelerating the test probe ( 4 ) and at least a second drive ( 24 . 26 ) for suspension ( 18.1 . 18.2 . 18.3 . 18.4 ) are provided, wherein the cable arrangement ( 6 ) at least four ropes ( 8.1 . 8.2 . 8.3 . 8.4 ) having. Test pendulum arrangement according to claim 1, wherein a control or regulation ( 28 ) for actuating the first drive ( 10 ) and the at least one second drive ( 24 . 26 ) is provided. Prüfpendelanordnung according to claim 1 or 2, wherein the first drive ( 10 ) and the at least one second drive ( 22 . 26 ) Linear drives are. Test pendulum arrangement according to one of the preceding claims, wherein two cables ( 8.1 . 8.2 ) in a first track ( 20 ) and two ropes ( 8.3 . 8.4 ) in a second track ( 24 ) are arranged, wherein for the first track and for the second track depending on a drive rail ( 20 . 24 ) are provided. Test pendulum arrangement according to one of the preceding claims, wherein each cable ( 8.1 . 8.2 . 8.3 . 8.4 ) has its own suspension, each suspension via its own drive carriage ( 18.1 . 18.2 . 18.3 . 18.4 ). Test pendulum arrangement according to one of the preceding claims, wherein the cable arrangement ( 6 ) has a rope length (l _P ) corresponding to a fraction (l _P / l _N ) of the standard rope length (l _N ). Prüfpendelanordnung according to any one of the preceding claims, wherein the first drive ( 10 ) a detachable connection ( 14 . 16 ) to the test probe ( 4 ), so that the test probe ( 4 ) from the first drive ( 10 ) can be decoupled. Prüfpendelanordnung according to any one of the preceding claims, wherein a cable connection between the first drive, in particular a carriage ( 14 ), and the test probe ( 4 ), wherein the length of the cable is dimensioned such that it allows at least an unimpeded first impact on the crash test dummy, but the test probe ( 4 ) when returning the drive ( 14 ) stops.

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