CN112560200B - Human body joint connection model design method - Google Patents
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Abstract
The invention relates to the technical field of automobile safety, in particular to a human body joint connection model design method, wherein the human body joint connection model design method comprises the following steps: establishing a first connector and a second connector matched with the first connector; establishing a first connecting unit body at the connecting position of the first connecting body, wherein a first type of connecting point is arranged on the first connecting unit body; and establishing a second connecting unit body at the joint of the second connector, arranging a second type of connecting point on the second connecting unit body, and connecting the first connecting point and the second connecting point in a matching manner so as to connect the first connector and the second connector.
Description
Technical Field
The invention relates to the technical field of automobile safety, in particular to a design method of a human body joint connection model.
Background
With the rapid development of the automobile industry, automobile safety has gradually become the most important index for evaluating automobile performance. The collision safety of an automobile is a performance of reducing the damage of a passenger to the maximum extent during and after an accident. Collision safety of automobiles is achieved through three approaches. First, damage is reduced by improving the crashworthiness of the vehicle. Measures to achieve this are now: collision buffer areas and bumpers are additionally arranged at the front part and the rear part of the vehicle body, a suspension engine anti-collision protection device is adopted, the rigidity of a cab is improved, and the like. Secondly, the synchronous movement of the passengers and the automobile is realized by controlling the movement of the passengers in the collision process, so that the impact damage and the secondary collision damage with objects in the cab are reduced. This function may be achieved using an occupant restraint system. A common occupant restraint system includes: safety belts, headrests, and the like. Thirdly, the contact rigidity between the human body and the inner part of the cockpit is reduced, and the contact area is increased to reduce the damage of secondary collision. The method can be realized by adopting the safe air bag and reducing the rigidity of an instrument panel and an interior trim. The digital dummy model established based on the damage mechanics can scientifically evaluate the impact and damage to the human body in the collision accident occurrence process, and is currently applied to international mainstream automobile companies for many years. Injury biomechanics is an important basic theory for automobile crash safety research. In a collision traffic accident, the passengers are exposed to the environment of mechanical impact load, and under the action of inertia force and contact force, various parts of tissues of a human body generate certain biomechanical response. If the mechanical response exceeds the limit that the human body can bear, the damage of human tissues and the loss of normal physiological functions can be caused. The main mechanical factors causing the injury are different due to different injured parts. Accordingly, the damage tolerance limit standards of different parts can be established.
Currently, the only commercially available collision dummy model on the international scale is that offered by the first safety company in the united states. The mainstream Hybrid III-type dummy model is taken as an example, is designed on the basis of basic parameters of a human body, has anthropomorphic basic structures such as rigid bones, soft tissue skins and the like, and has a certain biological simulation degree. However, in the design of the dummy model, the hinge model of the human body joint area adopts a rigid body hinge model simplified in finite element software, the simplified model is firstly a rigid body connection mode, the deformation of the joint under the action of external force cannot be simulated, meanwhile, in the collision and impact process, due to the rigid body characteristics of the link, extremely large impact force and impact acceleration can be generated at the trunk part of the dummy instantaneously, and a sharp peak often appears in an acceleration result curve of numerical simulation, which directly influences the accuracy of simulation.
Disclosure of Invention
Based on the technical defects, the design method of the invention mainly aims at the problems existing in the design of the existing dummy model, provides a brand-new design method for the digital modeling of the joint in the dummy model, and constructs a brand-new dummy joint model by using beam units and cable units which are commonly used in a finite element theory or beam units with three rotational degrees of freedom released at ports. The new dummy joint model can simulate the deformation of the joint area and the damage to the dummy in the collision process, can avoid the problem of 'over rigidity' of the dummy such as acceleration singularity and the like caused by the adoption of simplified rigid body articulation in the traditional dummy model, and avoids the problem of excessive 'noise' of the output result of the digital dummy in the simulation.
A method of designing a human body joint connection model, wherein: the method comprises the following steps:
establishing a first connector and a second connector matched with the first connector;
establishing a first connecting unit body at the connecting position of the first connecting body, wherein a first type of connecting point is arranged on the first connecting unit body;
establishing a second connecting unit body at the connecting position of the second connecting body, wherein a second type of connecting point is arranged on the second connecting unit body;
and matching and connecting the first connecting point with the second connecting point so as to connect the first connecting body with the second connecting body.
Preferably, in the method for designing a human body joint connection model, a first connection unit body is established at a connection point of the first connection body, and a first type of connection point is disposed on the first connection unit body, where the first connection unit body includes a first connection hole and a second connection hole, and the method specifically includes:
acquiring a rotation center point of the first connection hole to form a first rotation point, acquiring a rotation center of the second connection hole to form a second rotation point,
establishing a rotation axis based on the first rotation point and the second rotation point,
establishing a first rotation marker right triangle with a first end point of the rotation axis and a second rotation marker right triangle with a second end point of the rotation axis;
establishing N first connecting spokes by taking the first rotating point as an end point, wherein the other ends of the N first connecting spokes are arranged on the first connecting hole;
establishing N second connecting spokes by taking the second rotating point as an end point, wherein the other ends of the N second connecting spokes are arranged on the second connecting holes;
establishing a first rotation center point according to the first rotation point and the second rotation point, and establishing a cross connecting spoke according to the other end of the first connecting spoke, the first rotation center point and the other end of the second connecting spoke to form the first connecting unit body;
and forming the first type of connection point according to the first rotation point, the second rotation point and the first rotation center point.
Preferably, in the above method for designing a human body articulation model, the length of the rotation axis is not less than the distance between the first rotation point and the second rotation point.
Preferably, in the method for designing a human body joint connection model, the first rotation mark right triangle includes a 60 ° acute angle, and a vertex matching the 60 ° acute angle is disposed on the first connection hole.
Preferably, in the method for designing a human body joint connection model, the second rotation mark right triangle includes a 60 ° acute angle, and a vertex matching the 60 ° acute angle is disposed in the second connection hole.
Preferably, in the method for designing a human body joint connection model, N first connecting spokes are established by taking the first rotation point as an end point, where N is a natural number not less than 3.
Preferably, in the method for designing a human body joint connection model, a second connection unit body is established at a connection position of the second connection body, and a second type of connection point is arranged on the second connection unit body;
acquiring a rotation center point of the second connector to form a third rotation point and a fourth rotation point,
respectively establishing M third connecting spokes according to the third rotation point as an end point, wherein the other end point of the third connecting spoke is arranged on one side of the second connecting body matched with the third rotation point,
respectively establishing M fourth connecting spokes according to the fourth rotation point as an end point, wherein the other end point of the fourth connecting spoke is arranged on one side of the second connecting body matched with the fourth rotation point,
forming a second rotation center from the third rotation point and the fourth rotation point,
and forming the second type of connection point according to the third rotation point, the fourth rotation point and a second rotation center.
Preferably, the above method for designing a human body joint connection model, wherein M is a natural number not less than 3.
A computer-readable storage medium, having a computer program stored thereon, wherein the program, when executed by a processor, implements the method of designing a body articulation model according to any of the above.
An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of human joint model design as described in any one of the above when executing the computer program.
Compared with the prior art, the invention has the advantages that:
1. the human body joint connection model is formed in the design method, so that the deformation characteristics and the stress condition of a joint area when a driver faces collision simulation impact can be simulated, the acquisition of signals of the joint area of the dummy under multiple working conditions is realized, and the acquired signals can accurately describe the damage condition of the joint area;
2. the human body joint connection model formed by the design method overcomes the technical defect of over hardness caused by the use of a simplified rigid body hinge unit at present, so that an acceleration curve, an impact force curve and the like of a simulation result do not have ambiguous sharp peaks, the calculation error caused by the adoption of a rigid hinge link mode is removed, the simulation precision is improved, and the vehicle safety development process can be better guided;
3. the human body joint connection model formed by the design method can monitor the impact and deformation of each joint area of the whole dummy in the vehicle collision process, and further knows the whole stress state of the dummy through the stress and deformation characteristics of the output beam unit and the cable unit in the whole collision process.
Drawings
FIG. 1 is a schematic structural diagram of a human body joint connection model design method according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a human body articulation model formed by a method for designing a human body articulation model according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a human body articulation model formed by a method for designing a human body articulation model according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a human body articulation model formed by a method for designing a human body articulation model according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a human body articulation model formed by a method for designing a human body articulation model according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a human body articulation model formed by a method for designing a human body articulation model according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a human body joint connection model formed by a human body joint connection model design method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1, a method for designing a human body joint connection model, wherein: the method comprises the following steps:
step S110, establishing a first connecting body and a second connecting body matched with the first connecting body;
step S120, a first connecting unit body is established at the connecting position of the first connecting body, and a first type of connecting point is arranged on the first connecting unit body; the first and second connectors may be connectors that simulate bones and do not include a muscle portion.
Step S130, a second connecting unit body is established at the connecting position of the second connecting body, and a second type of connecting point is arranged on the second connecting unit body;
step S140, matching and connecting the first connection point and the second connection point to connect the first connector and the second connector.
As a further preferred embodiment, in the method for designing a human body joint connection model, in step S120, a first connection unit is established at a connection position of the first connection unit, and a first type of connection point is disposed on the first connection unit, where the first connection unit includes a first connection hole and a second connection hole, and specifically includes:
step S1201, acquiring a rotation center point of the first connection hole to form a first rotation point, acquiring a rotation center of the second connection hole to form a second rotation point,
step S1202, establishing a rotation axis according to the first rotation point and the second rotation point, as shown in fig. 2, the rotation axis L1 is disposed in the first connection hole 1 and the second connection hole center 2; wherein the length of the rotation axis is not less than the distance between the first rotation point and the second rotation point.
Step S1203, establishing a first rotation mark right triangle S1 with a first end point of the rotation axis, and establishing a second rotation mark right triangle S2 with a second end point of the rotation axis; the first rotation mark right triangle S1 and the second rotation mark right triangle S2 are unnecessary steps, and in general, in the case where the rotation angle needs to be recorded, the rotation angle of the first connection body can be acquired by the first rotation mark right triangle S1 or the second rotation mark right triangle S2, and in the case where the rotation angle is not needed, the first rotation mark right triangle S1 and the second rotation mark right triangle S2 may not need to be provided.
Further, the first rotary mark right triangle includes a 60 ° acute angle, and the vertex matching the 60 ° acute angle is disposed on the first connection hole. The second rotation mark right triangle comprises a 60-degree acute angle, and a vertex matched with the 60-degree acute angle is arranged in the second connecting hole.
As shown in fig. 3, in step S1204, N first connection spokes N1 are established with the first rotation point X1 as an end point, and the other ends of the N first connection spokes are disposed on the first connection holes;
step S1205, establishing N second connecting spokes (not labeled in the drawing) with the second rotation point as an end point, wherein the other ends of the N second connecting spokes are arranged in the second connecting holes;
as shown in fig. 4, step S1206 establishes a first rotation center point according to the first rotation point and the second rotation point, and establishes a cross connecting spoke according to the other end of the first connecting spoke, the first rotation center point and the other end of the second connecting spoke to form the first connecting unit body; for example, one of the illustrated cross-connecting spokes J1, the number of cross-connecting spokes is N, the larger the diameter of the through hole of the connecting hole, the larger the number of cross-connecting spokes, and the smaller the diameter of the through hole of the connecting hole, the smaller the number of cross-connecting spokes, where N is a natural number not less than 4.
As shown in fig. 5, the first type of connection point is formed according to the first rotation point X1, the second rotation point X2, and the first rotation center Z1.
As a further preferred embodiment, in the above method for designing a human body joint connection model, step S130, a second connection unit body is established at the connection position of the second connection body, and a second type of connection point is arranged on the second connection unit body;
step S1301, a rotation center point of the second connector is obtained to form a third rotation point and a fourth rotation point,
as shown in fig. 6, in step S1302, M third connecting spokes N3 are respectively established according to the third rotation point as an end point, another end point of the third connecting spoke is disposed on one side of the second connecting body matching the third rotation point,
step S1303, according to that the fourth rotation point is an end point, M fourth connecting spokes N4 are respectively established, and another end point of the fourth connecting spoke N4 is disposed on one side of the second connector matching the fourth rotation point, where M is a natural number not less than 4. Further, the number of M matches the number of N, where M equals N.
Step S1304 of forming a second rotation center from the third rotation point and the fourth rotation point,
as shown in fig. 7, in step S1305, the second type connection point is formed according to the third rotation point X3, the fourth rotation point X4 and the second rotation center.
After the above steps, the skeleton part is filled with the muscle part to form the artificial human.
The human body joint connection model formed by the design method overcomes the technical defect of over hardness caused by the use of a simplified rigid body hinge unit at present, so that an acceleration curve, an impact force curve and the like of a simulation result do not have ambiguous sharp peaks, the calculation error caused by the adoption of a rigid hinge link mode is removed, the simulation precision is improved, and the vehicle safety development process can be better guided; in addition, the impact and deformation of each joint area of the whole dummy in the vehicle collision process can be monitored, and the whole stress state of the dummy can be further known through the stress and deformation characteristics of the output beam unit and the cable unit in the whole collision process.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A human body joint connection model design method is characterized in that: the method comprises the following steps:
establishing a first connector and a second connector matched with the first connector;
establishing a first connecting unit body at the connecting position of the first connecting body, wherein a first type of connecting point is arranged on the first connecting unit body; wherein first connecting element body includes first connecting hole and second connecting hole, specifically includes:
acquiring a rotation center point of the first connection hole to form a first rotation point, acquiring a rotation center of the second connection hole to form a second rotation point,
establishing a rotation axis based on the first rotation point and the second rotation point,
establishing a first rotation marker right triangle with a first end point of the rotation axis and a second rotation marker right triangle with a second end point of the rotation axis;
establishing N first connecting spokes by taking the first rotating point as an end point, wherein the other ends of the N first connecting spokes are arranged on the first connecting hole;
establishing N second connecting spokes by taking the second rotating point as an end point, wherein the other ends of the N second connecting spokes are arranged on the second connecting holes;
establishing a first rotation center point according to the first rotation point and the second rotation point, and establishing a cross connecting spoke according to the other end of the first connecting spoke, the first rotation center point and the other end of the second connecting spoke to form the first connecting unit body;
forming the first type of connection point according to the first rotation point, the second rotation point and the first rotation center point;
establishing a second connecting unit body at the connecting position of the second connecting body, wherein a second type of connecting point is arranged on the second connecting unit body; the method specifically comprises the following steps: acquiring a rotation center point of the second connector to form a third rotation point and a fourth rotation point,
respectively establishing M third connecting spokes according to the third rotation point as an end point, wherein the other end point of the third connecting spoke is arranged on one side of the second connecting body matched with the third rotation point,
respectively establishing M fourth connecting spokes according to the fourth rotation point as an end point, wherein the other end point of the fourth connecting spoke is arranged on one side of the second connecting body matched with the fourth rotation point,
forming a second rotation center from the third rotation point and the fourth rotation point,
forming the second type of connection point according to the third rotation point, the fourth rotation point and a second rotation center;
and matching and connecting the first connecting body with the second connecting body to connect the first connecting body with the second connecting body.
2. The method of claim 1, wherein the length of the rotation axis is not less than the distance between the first rotation point and the second rotation point.
3. The method as claimed in claim 1, wherein the first rotation mark right triangle includes an acute angle of 60 °, and the vertex matching the acute angle of 60 ° is disposed on the first connection hole.
4. The method as claimed in claim 1, wherein the second rotation mark right triangle includes a 60 ° acute angle, and the vertex matching the 60 ° acute angle is disposed in the second connection hole.
5. The method of claim 1, wherein N first connecting spokes are established with the first rotation point as an end point, where N is a natural number not less than 3.
6. The method of claim 1, wherein M is a natural number not less than 3.
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