JP2004251717A - Dummy for motion analysis - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dummy enabling accurate analysis of the motion of each part of a body. <P>SOLUTION: Rotation angle detection devices 30-40 are provided respectively on shoulder joints 10 of the dummy, elbow joints 12, hand joints 14, crotch joints 16, knee joints 18 and foot joints 20. Since the rotation angle of each joint of the dummy is detected, the motion of each part of the body can be analyzed accurately. Since the rotation angles are not determined by operations based on accelerations or the like but detected directly, the rotation angle of each joint can be determined accurately. In addition, since the dummy has a mass error below 5% relative to a specified dummy, the motion similar to the specified dummy can be realized, and a test corresponding to specification can be performed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motion analysis dummy used for a vehicle crash test or the like, and more particularly to a motion analysis dummy for analyzing the motion of each part of a passenger's body.
[0002]
[Prior art]
Patent Literature 1 describes a dummy in which a load detection device is provided at a neck joint and a strain detection device is provided at a knee joint. Patent Literature 2 describes a dummy in which two members connected by a shoulder joint, an elbow joint, and the like are provided with an acceleration detecting device near each of these joints.
[Patent Document 1]
JP-A-4-251283 [Patent Document 2]
JP-A-9-297087
Problems to be Solved by the Invention, Means for Solving Problems, and Effects
An object of the present invention is to obtain a dummy capable of accurately analyzing the movement of each part of the body. This problem is solved by using a dummy having the following configuration. Each mode is described in the same manner as in the claims, divided into sections, each section is numbered, and described in a form in which the numbers of other sections are cited as necessary. This is for the purpose of facilitating the understanding of the technology described in this specification, and the technical features and their combinations described in this specification should not be construed as being limited to the following sections. Absent. In addition, when a plurality of items are described in one section, it is not always necessary to adopt all items together, and it is also possible to take out and adopt only some items.
[0004]
Of the following items, items (2), (3), and (9) correspond to claims 1, 2, and 3, respectively.
[0005]
(1) A dummy for analyzing the motion of each part of the occupant's body,
A motion analysis dummy characterized in that at least each of a shoulder joint, an elbow joint, a hand joint, a hip joint, a knee joint, and a foot joint is provided with a rotation angle detection device that detects a rotation angle of each of the joints. .
Each of the shoulder joint, the elbow joint, the hand joint, the hip joint, the knee joint, and the foot joint of the motion analysis dummy described in this section is provided with a rotation angle detection device that detects the rotation angle of the joint. The rotation angle of each joint of the dummy can be detected. For example, the motion of each part of the body of the dummy connected at the joint can be accurately analyzed.
Further, the rotation angle of the joint is directly detected, and is not obtained based on the acceleration detected by the acceleration detecting devices provided near the joints of the two members connected by the joint. Therefore, the rotation angle of the joint can be accurately acquired.
The rotation angle detection device detects an absolute rotation angle, which is a rotation angle from a reference relative position of two members, even if it detects a relative rotation angle of two members connected at a joint. Is also good. Further, the rotation direction of the two members may or may not be detectable. If the rotational direction of the joint is determined by the contents of the vehicle test to be performed, it is not always necessary to detect the rotational direction.
The motion analysis dummy described in this section is not limited to the rotation angle detection device, and may include a load detection device, a distortion detection device, an acceleration detection device, an angular velocity detection device, a displacement detection device, and the like in appropriate locations. it can.
(2) The motion analysis dummy according to the item (1), in which at least the mass difference from the standard dummy is 5% or less.
The motion analysis dummy described in this section has a mass difference of 5% or less from the standard dummy. When the rotation angle detecting device is provided, the mass of the dummy increases accordingly, but if the mass of the dummy itself is reduced (for example, the portion of the dummy corresponding to human muscle, the portion corresponding to bone, etc.) Is reduced), the mass difference as a whole can be reduced to 5% or less. As described above, if the standard dummy has the same mass, the same operation as the standard dummy is performed. In a standard test, this dummy can be used instead of the standard dummy, and compatibility with the standard dummy can be provided.
The standard dummies include Hybrid II and III (for frontal collision), DOT-SID, and EURO-SID (for side collision) used for evaluation of occupant protection performance in the event of a collision. Among these, Hybrid III is a common one used in the U.S. Department of Transportation Road Traffic Safety Administration (NHTSA), the European Commission (EC), and in frontal crash occupant protection certification tests conducted in Japan.
The dummy is not limited to the entire mass, and it is desirable that the mass of each part of the body be similar to the standard dummy. For example, the difference in mass between the body parts may be 5% or less, or the difference in the position of the center of gravity of each body part may be 5% or less of the size of the part.
(3) The rotation angle detection device provided at at least one of the plurality of joints is provided at a position off the relative rotation center of the two members connected by the at least one joint. The dummy for motion analysis according to the item 2).
When it is difficult to provide the rotation angle detection device near the relative rotation center of the two members, it is desirable to provide the rotation angle detection device at a position deviated from the relative rotation center.
(4) The motion analysis dummy according to (3), wherein a rotation transmission device that transmits the relative rotation of the two members to the rotation angle detection device is provided at the joint.
The rotation angle detection device detects a relative rotation angle between the two members transmitted by the rotation transmission device. Even if the rotation transmission device transmits in a state in which the actual rotation angle and the transmitted rotation angle are the same, the rotation transmission device transmits in a state in which the ratio of these angles becomes a predetermined value. Is also good. For example, it may include two gears having the same turning radius, or may include two gears having different turning radii.
(5) The rotation transmission device includes a first gear rotated with the relative rotation of the two members, and a second gear provided in a state of meshing with the first gear, and the rotation angle detection device. Is a rotary potentiometer for detecting a rotation angle of the second gear, the motion analysis dummy according to the above mode (4).
The first gear is provided in a state where its rotation center line coincides with the relative rotation center line of the two members, and the second gear is provided in a state in which it meshes with the first gear. Therefore, the rotation center of the second gear is at a position deviated from the relative rotation center of the two members.
(6) The dummy for motion analysis according to (5), wherein the second gear is made of a material that does not easily generate static electricity.
When a large rotational torque is applied to the joint, the rotational speeds of the first gear and the second gear increase. In this case, if the second gear is made of a material that easily generates static electricity, the rotation angle may not be accurately detected due to the static electricity. On the other hand, for example, when manufactured from a material such as a metal that does not easily generate static electricity, a decrease in the detection accuracy of the rotation angle can be prevented even if the rotation speed is high.
(7) The motion analysis dummy according to any one of (3) to (6), wherein the at least one joint is a knee joint, and the two members are a shin and a thigh.
In the knee joint, since it is difficult to provide the rotation angle detecting device near the center of relative rotation between the shin and the thigh, the rotation angle detecting device is provided at a position deviated from the center of relative rotation.
[0006]
(8) The storage unit according to any one of (1) to (7), further including a storage unit that stores information representing a rotation angle detected by at least one of the plurality of rotation angle detection devices. Dummy for motion analysis.
(9) The motion analysis dummy according to (8), wherein the storage unit is provided on a back.
(10) The motion analysis dummy according to the mode (8) or (9), wherein the storage unit is provided on a spine.
When the storage unit is provided outside the dummy, there is a possibility that the movement of the dummy may be limited by signal lines connecting the plurality of rotation angle detection devices and the storage unit. On the other hand, if the storage unit is provided inside the dummy, the movement of the dummy is not limited by this, and the movement of the dummy can be accurately analyzed.
Further, if the storage section is provided on the back of the dummy, the storage section can be prevented from being damaged by the dummy being used for a frontal collision test even if a large impact is applied from the front.
Further, when a member corresponding to a human spine is provided on the dummy, the member can be provided while being held by the spine.
In addition, since the storage unit is provided in the middle part of the dummy body, the total length of each signal line connected to each of the plurality of rotation angle detection devices can be shortened, and the increase in the mass of the dummy can be reduced. Can be.
(11) Any one of the above items (1) to (10) including a transmission device for transmitting information representing a rotation angle detected by at least one of the plurality of rotation angle detection devices to an external device. The motion analysis dummy described.
Information indicating the magnitude of the rotation angle detected by the rotation angle detection device is supplied to an external device by wireless communication. As a result, a signal line becomes unnecessary, and the mass added to the dummy can be reduced correspondingly.
(12) A dummy for analyzing the movement of each part of the occupant's body,
A motion analysis dummy, wherein at least one of a shoulder joint, an elbow joint, a hand joint, a hip joint, a knee joint, and a foot joint is provided with a rotation angle detection device that detects a rotation angle of the joint.
The technical features described in any of the above items (1) to (11) can be adopted for the motion analysis dummy described in this item.
[0007]
(13) A storage unit provided in the motion analysis dummy according to any one of (8) to (10),
A motion analysis unit including a connection unit with the storage unit, and a motion analysis unit configured to analyze a motion of the motion analysis dummy based on information stored in the storage unit.
After mounting the dummy on the vehicle and performing a frontal collision test of the vehicle, the storage unit is taken out of the dummy and connected to the motion analysis unit. In the motion analysis unit, the motion of the dummy at the time of a head-on collision is analyzed based on the rotation angle of each joint stored in the storage unit.
The dummy can be used not only for a frontal collision test but also for a side collision test, a rollover test and the like. Further, the present invention can be used not only for accident analysis (motion analysis) when an accident occurs, but also for motion analysis during traveling (for example, sudden braking, sudden starting, and sudden turning).
(14) The plurality of rotation angle detection devices provided on the motion analysis dummy according to any one of (1) to (12),
A transmitting device that transmits information representing the rotation angle detected by the plurality of rotation angle detection devices,
A receiving device disposed outside the motion analysis dummy and receiving information transmitted from the transmitting device,
A motion analysis unit that analyzes the motion of the motion analysis dummy based on information received by the receiving device.
In the motion analysis unit, the motion of the dummy is analyzed based on the information received by the receiving device.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
A dummy according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, rotation angle detection devices 30 to 40 are provided at the dummy shoulder joint 10, elbow joint 12, hand joint 14, hip joint 16, knee joint 18, and foot joint 20 of the present embodiment, respectively. Provided.
The rotation angle detection device 30 provided at the shoulder joint 10 detects the rotation angle of the upper arm 45 with respect to the torso 44, and the rotation angle detection device 32 provided at the elbow joint 12 detects the rotation angle of the forearm 46 with respect to the upper arm 45. Then, the rotation angle detection device 34 provided at the joint 14 of the hand detects the rotation angle of the hand 47 with respect to the forearm 46. Further, a rotation angle detection device 36 provided at the hip joint 16 detects a rotation angle of the thigh 48 with respect to the torso 44, and a rotation angle detection device 38 provided at the knee joint 18 detects a rotation angle of the shin 49 with respect to the thigh 48. The rotation angle detection device 40 provided at the foot joint 20 detects the rotation angle of the foot 50 with respect to the shin 49.
[0009]
These rotation angle detection devices 30 to 34, 38 are rotary potentiometers that electrically detect the relative rotation angle of each of the two members, and the rotation angle detection devices 36, 40 are three-dimensional three-dimensional points of the joint. A change in position in space is optically detected, and a three-dimensional rotation state of the joint is detected based on the detected change in position.
[0010]
Some of the rotation angle detection devices 30 to 40 include one detection unit, and some include two or more detection units. For example, the rotation angle detection device 38 provided on the knee joint 18 includes one detection unit that detects an angle formed between the thigh 48 and the shin 49, as described later. On the other hand, the rotation angle detection device 34 provided on the joint 14 of the hand includes a plurality of detection units that detect angles between the forearm 46 and the hand 47 in directions different from each other. When the forearm 46 and the hand 47 are projected on different planes, the respective angles are detected by the plurality of detection units, respectively, whereby the three-dimensional movement of the wrist is detected. The rotation angle detection device 30 provided in the shoulder joint 10 also includes a plurality of detection units. The plurality of detectors detect the rotation angle of the upper arm 45 with respect to the body 44 in the up-down direction, the front-rear direction, the left-right direction, and the like, and detect the three-dimensional movement of the upper arm 45 with respect to the body 44.
[0011]
In the present embodiment, motion detecting devices 60, 62, and 64 including at least one of an angular velocity detecting device and an acceleration detecting device are provided on the head 54, the chest 55, and the waist 56, respectively. The angular velocity detecting device detects the rotational angular velocities of the head 54, the chest 55, and the waist 56 around the rotation center line, and the acceleration detecting device detects the acceleration of the head 54, the chest 55, and the waist 56. is there.
Based on the angular velocity detected by the angular velocity detecting device and the acceleration detected by the acceleration detecting device, the movement of the head 54, the chest 55, and the waist 56 can be detected. Also, the load applied to these can be detected.
[0012]
The rotation angle detection device 38 provided on the knee joint 18 is provided at a position deviated from the relative rotation center line P between the thigh 48 and the shin 49 as shown in FIGS. In the knee joint 18, a housing 60 which is a member on the thigh 48 side and a knee clevis 62 which is a member on the shin 49 side are connected via a knee slider 64. Further, a rotation transmission device 66 for transmitting the relative rotation between the housing 60 and the clevis 62 to the rotation angle detection device 38 is provided.
[0013]
The knee slider 64 includes a slider housing 70 and a slide member 72 held by the slider housing 70 so as to be relatively non-rotatable and relatively movable. The slide member 72 is relatively movable along a groove 74 provided in the slider housing 70.
The knee clevis 62 is fixed to the slider housing 70, and the housing 60 is held by the slide member 72 so as to be relatively immovable and relatively rotatable. A first gear 76 is fixed to the slide member 72 by a bolt 78 via an iron washer 80, a rubber bush 82 and the like so as to be relatively rotatable. The central axis of the bolt 78 is the relative rotation axis P.
The second gear 84 is held by the housing 60 in a state in which the second gear 84 meshes with a tooth portion provided on the outer peripheral portion of the first gear 76. The rotation angle of the second gear 84 is detected by the rotation angle detection device 38. The ratio between the rotation angle of the first gear 76 and the rotation angle of the second gear 84 is determined according to the ratio of the number of teeth between the first gear 76 and the second gear 84. The rotation transmission device 66 is constituted by the gear 84 and the like.
In the present embodiment, since it is difficult to provide a rotation angle detection device around the relative rotation center axis P, the rotation angle detection device 38 is provided at a position offset from the relative rotation center axis P.
[0014]
As shown in FIG. 4, the relative rotation of the shin 49 to the thigh 48 is realized by the relative rotation of the knee clevis 62 to the housing 60. As the knee clevis 62 rotates, the entire knee slider 64 is rotated, and the slide member 72 is relatively rotated with respect to the housing 60. The first gear 76 is rotated, the rotation is transmitted to the second gear 84, and the rotation of the second gear 84 is detected by the rotation angle detection device 38.
The relative movement of the thigh 48 with respect to the shin 49 is realized by the relative movement of the knee clevis 62 with respect to the housing 60 in the axial direction Q. That is, the movement is realized by the relative movement of the slide member 72 in the Q direction with respect to the slider housing 70 fixed to the knee clevis 62. With the movement of the slide member 72, the housing 60 (held by the second gear 84), One gear 76 and the relative rotation center axis P are moved. As described above, in the present embodiment, the housing 60 and the first gear 76 are integrally moved with the movement of the slide member 72 with respect to the slider housing 70. Therefore, the relative positional relationship between the first gear 76 and the second gear 84 does not change due to the relative movement. Accordingly, the detection of the relative rotation is not affected by the relative movement of the thigh 48 with respect to the shin 49, and these relative rotation angles can be accurately detected.
[0015]
In the present embodiment, the stroke detector 88 detects the amount of relative movement of the slide member 72 with respect to the slider housing 70 in the knee slider 64. In addition, there is a predetermined relationship between the relative movement amount of the slide member 72 with respect to the slider housing 70 and the magnitude of the force in the Q direction applied to the knee joint 18, and these relationships are known in advance. Therefore, based on the amount of relative movement of the slide member 72 with respect to the slider housing 70 and the relationship therebetween, the force in the Q direction applied to the knee joint 18 can be obtained.
[0016]
The second gear 84 is made of a metal material. When a large force is applied to the knee joint 18, the first gear 76 and the second gear 84 are rotated at a large acceleration, and the rotation speed may increase. In this case, if the second gear 84 is made of a resin material, static electricity is generated and the rotation angle detection device 38 electrically detects the static electricity. On the other hand, if the second gear 84 is made of a metal material, the generation of static electricity is suppressed, and a decrease in rotation angle detection accuracy even at high speed rotation is avoided.
[0017]
In the present embodiment, as shown in FIG. 1, a data recorder 90 as a storage unit is held on a dummy spine 92. As shown in FIG. 5, a plurality of rotation angle detecting devices 30 to 40, motion detecting devices 60 to 64, a stroke detecting device 88, and the like are connected to the data recorder 90 via a signal line 94. Information representing the detection result is supplied and stored. Further, since the data recorder 90 is provided at the center of the dummy, the total length of the signal lines 94 connecting the plurality of rotation angle detecting devices 30 to 40, the motion detecting devices 60 to 64, and the stroke detecting device 88, respectively. , The amount of increase in the mass of the dummy can be reduced.
In addition, the error between the mass of the dummy and the mass of Hybrid III as the standard dummy is within 5%. By reducing the weight of the material constituting the human muscle or the weight of the material constituting the skeleton of the dummy, the mass of the dummy is reduced in accordance with the mass increased by providing the detection device and the like. In this case, it is also possible to reduce the error of the mass of each body part such as the dummy arms 45 and 46, the trunk 44, the thigh 48, and the shin 49. Further, the error of the position of the center of gravity of each part of the body can be set to 5% or less of the dimension of each part.
In addition, these errors can be set to 3% or less, 2% or less, and 1% or less.
[0018]
In the present embodiment, the vehicle is collided head-on with the dummy seated on the driver's seat or the passenger seat. The rotation angle and the like of each of the dummy joints are detected at predetermined time intervals by a detection device and supplied to the data recorder 90. In the data recorder 90, the supplied data is stored.
After the frontal collision test, the data recorder 90 is taken out of the dummy and connected to the connection of the computer 100 as a motion analysis device. In the computer 100, the dummy motion is analyzed and output to an output device 102 (which can include, for example, a three-dimensional animation).
[0019]
In the present embodiment, the rotation angle of the joint is directly detected. It is not detected based on the acceleration detected by the acceleration detecting device provided near the joint of the two members connected by the joint. Therefore, the rotation angle of the joint can be accurately obtained, and the occupant obstacle value can be appropriately acquired.
Further, since the mass of the dummy is close to that of the hybrid III, the motion of the dummy can be accurately detected in a test conforming to the standard.
Further, since the data recorder 90 is provided inside the dummy, there is no need to wire the signal line 94 outside the dummy. As a result, the movement of the dummy can be prevented from being restricted by the signal line, and the movement of the dummy can be accurately detected.
[0020]
Note that the rotation angle detection device is not limited to that in the above embodiment. At least one of the rotation angle detection devices 30 to 40 may magnetically detect the relative rotation angle of the two members. Further, all of the rotation angle detection devices 30 to 40 may be optically detected or may be electrically detected. Further, the rotation angle detecting device can be provided at a joint of a dummy neck. Further, the rotation angle detecting device is not limited to the knee joint 18 and may be provided at a position other than the relative rotation center line of the two members in other joints.
Further, the dummy is not limited to the case in the above embodiment, and other detection devices can be provided. For example, a displacement detecting device can be provided on the chest 55, and a load detecting device can be provided on the thigh 48.
It is not essential to provide the data recorder 90 on the back. The data recorder 90 is desirably provided in a portion where damage is relatively small in a collision test.
Further, a communication device can be provided in the dummy. Information indicating the rotation angle detected by the rotation angle detection device or the like is supplied to an external device through communication, and the motion is analyzed in the external device. In this case, the signal line itself becomes unnecessary, and an increase in the mass of the dummy can be suppressed.
[0021]
The present invention can be embodied with various modifications and improvements based on the knowledge of those skilled in the art, in addition to the aspects described in [Problems to be Solved by the Invention, Problem Solving Means and Effects].
[Brief description of the drawings]
FIG. 1 is a diagram showing an entire motion analysis dummy according to an embodiment of the present invention.
FIG. 2 is a view showing a structure of a knee joint of the dummy.
FIG. 3 is a sectional view of the knee joint.
FIG. 4 is a diagram showing the movement of the knee joint.
FIG. 5 is a diagram showing the periphery of a storage unit provided in the dummy.
FIG. 6 is a diagram illustrating a motion analysis device that performs motion analysis based on data stored in the storage unit.
[Explanation of symbols]
30-40: rotation angle detection device, 90: data recorder

Claims (3)

A dummy for analyzing the movement of each part of the occupant's body,
At least a shoulder joint, an elbow joint, a hand joint, a hip joint, a knee joint, and a foot joint are provided with a rotation angle detection device that detects a rotation angle of each of the joints, and a mass difference between the standard dummy and at least 5 % Or less for motion analysis. The motion analysis device according to claim 1, wherein the rotation angle detection device provided at at least one of the plurality of joints is provided at a position deviated from a relative rotation center of the two members connected by the at least one joint. dummy. The motion analysis dummy according to claim 1, wherein a storage unit that stores a rotation angle detected by at least one of the plurality of rotation angle detection devices is provided on a back.

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