CN105868506B - The trampoline take-off movement simulating analysis of simulation is coupled based on kinesiology and wire side finite element - Google Patents
The trampoline take-off movement simulating analysis of simulation is coupled based on kinesiology and wire side finite element Download PDFInfo
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- 210000002683 foot Anatomy 0.000 claims description 15
- 210000004394 hip joint Anatomy 0.000 claims description 12
- 210000003314 quadriceps muscle Anatomy 0.000 claims description 12
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
Abstract
The present invention relates to a kind of trampoline take-off movement simulating analysis that simulation is coupled based on kinesiology and wire side finite element, belong to trampolinist's training ancillary technique field.This method comprises: establishing the wire side finite element model of trampoline；Human model is established, and Human model is coupled with wire side finite element model；The kinesiology data of target sportsman trampoline take-off movement are obtained by simulation analysis.The present invention can accurately realize the dynamics simulation of people, net coupling, and carry out the Dynamics Simulation Analysis of sportsman's trampoline net take-off movement, and then the kinesiology data of sportsman's trampoline take-off movement are obtained, to instruct sportsman's trampoline take-off movement technology to provide foundation.
Description
Technical field
The present invention relates to a kind of trampoline take-off movement emulation point that simulation is coupled based on kinesiology and wire side finite element
Analysis method is particularly suitable for the technical movements of study movement person, belongs to trampolinist's training ancillary technique field.
Background technique
As far as the applicant is aware, trampolining early has become the medal sport of the Olympic Games, in this movement, human body exists
Jump on trampoline is an extremely complex process, belongs to kinetic regime.
Applicant once delivered two meeting papers in 2013: " load test stabilization and finite element modeling of trampoline net " and
" finite element modeling of trampoline and the quasi- calculating of best take-off modulus of periodicity ", describes trampoline net is first carried out finite element in the text
Modeling, then the basic skills that result is calculated in simulation is carried out with model.The emulation of this method binding kinetics and computer simulation
Method studies the optimized problem of take-off movement, can instruct optimization trampolinist's take-off movement.
Hereafter, applicant concentrates on research emphasis in the Dynamic Modeling of human body, is ground by the coupling of people, pessimistic concurrency control
Study carefully, explore the initial take_off speed for improving sportsman and makes up to optimized approaches and methods.
ADAMS (Automatic Dynamic Analysis of Mechanical System) software is by U.S.'s machine
The mechanical system Dynamic Simulation Software of tool utility companies (Mechanical System) exploitation is most widely used at present dynamic
One of machine software.Using ADAMS software, user be can be convenient, quickly establish the mechanical model of risk management.LifeMOD
Software is a plug-in unit of the ADAMS about biomethanics field, can be used for establishing the Human model comprising muscle systems.
Applicant once delivered more documents related to this:
Application [J] Najing Physical Culture Inst. journal of Su Yang, Qian Jingguang, the Song Yawei .LifeMOD in sport biomechanics:
Natural science edition, 2007,6 (4): 1-3.
Zhang Jianchi, Qian Jingguang women's trampoline " 811 " Biomechanics Analysis [J] Najing Physical Culture Inst. journal: from
So science version, 2012,11 (5): 45-48.
The whole nation kinematics analysis [A] of the online take-off movement of the Jiangsu Province Li Guangkai, Qian Jingguang trampolinist Zhou Xinyi
Sport biomechanics academic exchange conference [C], 2012.
The online south take-off movement technical characteristic analysis [J] of Chen Min, Wang Tao, Qian Jingguang elite Chinese male trampolinist
Capital Physical Culture Institute journal: natural science edition, 2014,13 (4): 44-48.
The south modeling comparison [J] of Rong Ke, Qian Jingguang sport biomechanics simulation modeling software LifeMOD and OpenSim
Capital Physical Culture Institute journal: natural science edition, 2015 (5): 38-42.
Summary of the invention
The technical problems to be solved by the present invention are: overcoming the problems, such as of the existing technology, provide a kind of dynamic based on human body
Mechanics and wire side finite element couple the trampoline take-off movement simulating analysis of simulation, obtain the people of sportsman's trampoline take-off movement
Body dynamics data (such as muscle strength), to instruct sportsman's trampoline take-off movement technology to provide foundation.
The technical solution that the present invention solves aforementioned technical problem is as follows:
A kind of trampoline take-off movement simulating analysis coupling simulation based on kinesiology and wire side finite element, it is special
Sign is, comprising the following steps:
The first step, the wire side finite element model for establishing trampoline:
S1. type, quantity and the position of spring around trampoline net are counted, and measures the elasticity system of various types of spring
Number；To dead load mechanical property testing is carried out at trampoline net center, sinking displacement at dead load and trampoline net center is obtained
Relationship；
S2. the wire side finite element model for establishing trampoline is combined using ANSYS software and ADAMS software, wherein in the model
The rigid plate of the simulation of pre-set dimension is established in the central area of simulated trampoline net；
Second step establishes Human model, and Human model is coupled with wire side finite element model:
T1. two DVs, the camera site of fixed each DV are used, and sets the bat of each DV
Take the photograph speed；
T2. analytical framework being placed on trampoline net, two DVs simultaneously shoot analytical framework, and
To analytical framework video；Analytical framework is removed later, trampolining movement is done on same trampoline net by target sportsman, together
When shot respectively by two DVs, and obtain sport video；It include the pressure network of target sportsman in the sport video
Process, the pressure network process are the process to reduce as far as possible to trampoline net of touching net since the sportsman；
T3. APAS analysis software is used, analytical framework video and sport video are parsed respectively, and use analytical framework
Each joint of all preset mark point spotting sportsmen coordinate, and then obtain each joint of target sportsman kinematics number
According to；The kinematic data is converted into the slf formatted file that LifeMOD software can identify；
T4. operation LifeMOD software and the kinematic data inputted in file obtained by T3 and the people for establishing target sportsman
Body dynamics model, the trampoline net that then foot of manikin contained by Human model and the first step are simulated create
The coupling of Human model and wire side finite element model is realized in contact；
Third step, the kinesiology data that target sportsman trampoline take-off movement is obtained by simulation analysis:
U1. gravity is added on the manikin contained by Human model using LifeMOD software, later according to second
It walks kinematic data obtained by T3 and carries out IK Solvers emulation, and by each joint unit of manikin and each muscle unit point
The exercise data of itself is not recorded；
U2. tracking factor is established on manikin using LifeMOD software, later according to the recorded driving people of U1
Body Model carries out forward dynamics simulation analysis, and obtains kinesiology data；Simulating analysis terminates.
Further perfect technical solution is as follows by the present invention:
Preferably, the detailed process of first step S2 are as follows:
Firstly, simulating trampoline net using ANSYS software, and obtain the modal neutral file of MNF format；
Then, the ADAMS/Flex module that modal neutral file is imported to ADAMS software, makes ADAMS software according to the mould
State neutral file simulates trampoline net；
Then, using ADAMS software, several mark points are established around the trampoline net of simulation, on the trampoline net side
Edge establishes node corresponding with each mark point, and connects corresponding mark point and node to simulate spring；These simulation springs
Type, quantity and position are identical as the statistical result of S1, and the measurement result of the coefficient of elasticity of various types of simulation spring and S1
It is identical；
Finally, the rigid plate of the simulation of pre-set dimension is established in the central area of the trampoline net using ADAMS software,
And the rigid plate edge is locked with the trampoline net.
It is highly preferred that the modal neutral file contains the component parameter of trampoline net；The component parameter includes: flexibility
The geometric parameter of body, the geometric parameter include the position coordinates and connectivity of each node in trampoline net；Trampoline net Nei Gejie
The quality and rotary inertia of point；Each rank mode of trampoline net；The mode generalized mass and generalized velocity of trampoline net.
Using the above preferred embodiment, the wire side finite element model of trampoline can be preferably established, is conducive in the next steps
Obtain more accurate kinesiology data.
Preferably, the wire side finite element model that first step S2 is established meets following condition:
Using ADAMS software, dead load A is loaded at the trampoline net center of simulation, and simulate the sinking of trampoline net
Process obtains the sinking displacement δ a at the trampoline net center；Later, according under at dead load obtained by S1 and trampoline net center
The relationship of heavy displacement, practical sinking displacement δ t at the trampoline net center of static loading experiment when obtaining load dead load A；Finally, meter
Calculate errorError ε is less than 8%.
Using the above preferred embodiment, the accuracy of established model can be further assured that.
Preferably, the detailed process of second step T1 are as follows:
Using two DVs, the camera site of fixed each DV makes the primary optical axis point of each DV
It is not parallel to trampoline net and the respectively vertical straight line intersection with trampoline net central point excessively, and makes two DV key lights
Angle between axis is 90o, and a DV is located at trampoline front, and another DV is located at trampoline side；Meanwhile
The shooting speed of each DV is respectively set as 100 frames/second.
Preferably, the detailed process of second step T4 are as follows:
It is successively carried out using LifeMOD software: human skeleton model is established according to the human figure parameter of target sportsman；
Joint connection and muscle are established on human skeleton model, obtain manikin；Kinematic data in file obtained by T3 is added
Be loaded on manikin, molility factor is added on manikin and drive in manikin each node and model block along
It is moved by the trajectory line that kinematic data is formed, to establish kinematic pair；Run equilibrium analysis, enable manikin according to
The track of kinematic pair moves, to obtain Human model；Create the foot and the first step of human body in Human model
The coupling of Human model and wire side finite element model is realized in the contact between trampoline net simulated.
It is highly preferred that analytical framework is three-dimensional DLT radial frame in T2；In T3, APAS analysis software is Ariel
The Ariel Performance Analysis System motion analysis system of Dynamics company exploitation；In T4, target movement
The human figure parameter of member includes gender, height, weight, age.
Preferably, in third step U2, the kinesiology data are the data changed over time；The human body power
Learning data includes contact force data of the target sportsman with trampoline net；The joint of lower extremity force data of target sportsman；Target fortune
The lower limb muscles power and muscle stretch length data of mobilization.
It is highly preferred that contact force includes left foot contact force and right crus of diaphragm contact force；
Joint of lower extremity power includes left hip joint power, right hip joint power, left knee joint power, right knee joint power, left ankle-joint power
And right ankle-joint power；
Lower limb muscles power and muscle stretch length include left gluteus maximus muscular force and muscle stretch length, right gluteus maximus muscle
Muscular force on the outside of power and muscle stretch length, left quadriceps group inside muscular force and muscle stretch length, left quadriceps group
With muscle stretch length, on the inside of right quadriceps muscle of thigh group on the outside of muscular force and muscle stretch length, right quadriceps muscle of thigh group muscular force and
Muscular force and muscle stretch are long on the outside of muscle stretch length, left gastrocnemius inside muscular force and muscle stretch length, left gastrocnemius
Muscular force and muscle stretch length, left flatfish on the outside of degree, right gastrocnemius inside muscular force and muscle stretch length, right gastrocnemius
Flesh muscular force and muscle stretch length and right soleus muscle power and muscle stretch length.
Preferably, in second step T3, target sportsman hip joint and knee is also obtained after parsing using APAS analysis software
The angle change data in joint.
Applicant is goed deep into practical studies discovery, although having existed for establishing using LifeMOD software in the prior art
The technological means of Human model, but this is not able to satisfy the demand of trampolining research, it is also necessary to it can accurate simulation
Trampoline net and the technological means for ensuring to obtain after trampoline model is coupled with manikin accurate kinesiology data.?
On the basis of this, applicant repeatedly practise research after obtained technical solution of the present invention finally, can accurate simulation trampoline net,
Can ensure that again can obtain accurate kinesiology data after trampoline model is coupled with manikin.
The present invention can accurately realize the dynamics simulation of people, net coupling, and carry out sportsman's trampoline net take-off movement
Dynamics Simulation Analysis, and then the kinesiology data of sportsman's trampoline take-off movement are obtained, to instruct sportsman's trampoline to rise
It jumps stroking technique and foundation is provided.
Detailed description of the invention
Fig. 1 is the wire side finite element model of specific embodiment of the invention test case.
Fig. 2 is the analytical framework figure of specific embodiment of the invention test case.
Fig. 3 is the remote angle figure of sportsman's pressure network process in specific embodiment of the invention test case.
Fig. 4 is the model established on human skeleton model after the connection of joint in specific embodiment of the invention test case
Schematic diagram.
Fig. 5 is the model signal after establishing muscle in specific embodiment of the invention test case on human skeleton model
Figure.
Fig. 6 is that manikin establishes the model schematic after kinematic pair in specific embodiment of the invention test case.
After Fig. 7 couples for Human model in specific embodiment of the invention test case with wire side finite element model
Schematic diagram.
Fig. 8 is that the contact force of sportsman and wire side changes over time figure in specific embodiment of the invention test case.
Fig. 9, Figure 10 are that the joint of lower extremity power of sportsman in specific embodiment of the invention test case changes over time figure.
Figure 11 to Figure 14 is the lower limb muscles power and muscle stretch of sportsman in specific embodiment of the invention test case
Length changes over time figure.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawings and in conjunction with the embodiments.But the present invention is not limited to be given
Example out.
The trampoline for coupling simulation based on kinesiology and wire side finite element that the present invention uses when being embodied plays bounce
Make simulating analysis, comprising:
The first step, the wire side finite element model for establishing trampoline:
S1. type, quantity and the position of spring around trampoline net are counted, and measures the elasticity system of various types of spring
Number；To dead load mechanical property testing is carried out at trampoline net center, sinking displacement at dead load and trampoline net center is obtained
Relationship.
S2. the wire side finite element model for establishing trampoline is combined using ANSYS software and ADAMS software, wherein in the model
The rigid plate of the simulation of pre-set dimension is established in the central area of simulated trampoline net.
The detailed process of S2 are as follows:
Firstly, simulating trampoline net using ANSYS software, and obtain the modal neutral file of MNF format；
The modal neutral file contains the component parameter of trampoline net；The component parameter includes: the geometric parameters of flexible body
Number, which includes the position coordinates and connectivity of each node in trampoline net；In trampoline net the quality of each node with
Rotary inertia；Each rank mode of trampoline net；The mode generalized mass and generalized velocity of trampoline net.
Then, the ADAMS/Flex module that modal neutral file is imported to ADAMS software, makes ADAMS software according to the mould
State neutral file simulates trampoline net；
Then, using ADAMS software, several mark points are established around the trampoline net of simulation, on the trampoline net side
Edge establishes node corresponding with each mark point, and connects corresponding mark point and node to simulate spring；These simulation springs
Type, quantity and position are identical as the statistical result of S1, and the measurement result of the coefficient of elasticity of various types of simulation spring and S1
It is identical；
Finally, the rigid plate of the simulation of pre-set dimension is established in the central area of the trampoline net using ADAMS software,
And the rigid plate edge is locked with the trampoline net.
The wire side finite element model that S2 is established meets following condition:
Using ADAMS software, dead load A is loaded at the trampoline net center of simulation, and simulate the sinking of trampoline net
Process obtains the sinking displacement δ a at the trampoline net center；Later, according under at dead load obtained by S1 and trampoline net center
The relationship of heavy displacement, practical sinking displacement δ t at the trampoline net center of static loading experiment when obtaining load dead load A；Finally, meter
Calculate errorError ε is less than 8%.
Second step establishes Human model, and Human model is coupled with wire side finite element model:
T1. two DVs, the camera site of fixed each DV are used, and sets the bat of each DV
Take the photograph speed.
The detailed process of T1 are as follows:
Using two DVs, the camera site of fixed each DV makes the primary optical axis point of each DV
It is not parallel to trampoline net and the respectively vertical straight line intersection with trampoline net central point excessively, and makes two DV key lights
Angle between axis is 90o, and a DV is located at trampoline front, and another DV is located at trampoline side；Meanwhile
The shooting speed of each DV is respectively set as 100 frames/second.
T2. analytical framework being placed on trampoline net, two DVs simultaneously shoot analytical framework, and
To analytical framework video；Analytical framework is removed later, trampolining movement is done on same trampoline net by target sportsman, together
When shot respectively by two DVs, and obtain sport video；It include the pressure network of target sportsman in the sport video
Process, the pressure network process are the process to reduce as far as possible to trampoline net of touching net since the sportsman.
T3. APAS analysis software is used, analytical framework video and sport video are parsed respectively, and use analytical framework
Each joint of all preset mark point spotting sportsmen coordinate, and then obtain each joint of target sportsman kinematics number
According to；The kinematic data is converted into the slf formatted file that LifeMOD software can identify.
In addition, target sportsman hip joint and kneed angle is also obtained after parsing using APAS analysis software in T3
Spend delta data.
T4. operation LifeMOD software and the kinematic data inputted in file obtained by T3 and the people for establishing target sportsman
Body dynamics model, the trampoline net that then foot of manikin contained by Human model and the first step are simulated create
The coupling of Human model and wire side finite element model is realized in contact.
The detailed process of T4 are as follows:
It is successively carried out using LifeMOD software: human skeleton model is established according to the human figure parameter of target sportsman；
Joint connection and muscle are established on human skeleton model, obtain manikin；Kinematic data in file obtained by T3 is added
Be loaded on manikin, molility factor is added on manikin and drive in manikin each node and model block along
It is moved by the trajectory line that kinematic data is formed, to establish kinematic pair；Run equilibrium analysis, enable manikin according to
The track of kinematic pair moves, to obtain Human model；Create the foot and the first step of human body in Human model
The coupling of Human model and wire side finite element model is realized in the contact between trampoline net simulated.
Specifically, analytical framework is three-dimensional DLT radial frame in T2；In T3, APAS analysis software is Ariel
The Ariel Performance Analysis System motion analysis system of Dynamics company exploitation；In T4, target movement
The human figure parameter of member includes gender, height, weight, age.
Third step, the kinesiology data that target sportsman trampoline take-off movement is obtained by simulation analysis:
U1. gravity is added on the manikin contained by Human model using LifeMOD software, later according to second
It walks kinematic data obtained by T3 and carries out IK Solvers emulation, and by each joint unit of manikin and each muscle unit point
The exercise data of itself is not recorded.
U2. tracking factor is established on manikin using LifeMOD software, later according to the recorded driving people of U1
Body Model carries out forward dynamics simulation analysis, and obtains kinesiology data；Simulating analysis terminates.
In U2, the kinesiology data are the data changed over time；The kinesiology data include mesh
Mark contact force data of the sportsman with trampoline net；The joint of lower extremity force data of target sportsman；The lower limb flesh of target sportsman
Meat power and muscle stretch length data.
Wherein, contact force includes left foot contact force and right crus of diaphragm contact force；
Joint of lower extremity power includes left hip joint power, right hip joint power, left knee joint power, right knee joint power, left ankle-joint power
And right ankle-joint power；
Lower limb muscles power and muscle stretch length include left gluteus maximus muscular force and muscle stretch length, right gluteus maximus muscle
Muscular force on the outside of power and muscle stretch length, left quadriceps group inside muscular force and muscle stretch length, left quadriceps group
With muscle stretch length, on the inside of right quadriceps muscle of thigh group on the outside of muscular force and muscle stretch length, right quadriceps muscle of thigh group muscular force and
Muscular force and muscle stretch are long on the outside of muscle stretch length, left gastrocnemius inside muscular force and muscle stretch length, left gastrocnemius
Muscular force and muscle stretch length, left flatfish on the outside of degree, right gastrocnemius inside muscular force and muscle stretch length, right gastrocnemius
Flesh muscular force and muscle stretch length and right soleus muscle power and muscle stretch length.
Test case:
Trampolining is done on predetermined trampoline for certain sportsman, simulation analysis is carried out using preceding method:
(1) first step S1 is executed, in which:
Through counting, totally 112, spring around trampoline net, and it is divided to bulky spring and two kinds of hairspring；Wherein, hairspring has
104, four sides of trampoline net are distributed in, bulky spring there are 8, is distributed in the quadrangle of trampoline net；Drawn experiment measurement is thick
The coefficient of elasticity of thin two kinds of springs is 1.10KN/m, 0.70KN/m respectively.
(2) first step S2 is executed, in which:
112 Marker mark points are established around the trampoline net of simulation using ADAMS software, with No. 1 spring and No. 2
Spring is separately connected corresponding Marker mark point and wire side node.The coefficient of elasticity of No. 1 spring and No. 2 springs is respectively
0.6952KN/m、1.109KN/m。
The rigid plate of length and width a height of 40cm, 20cm, 0.2cm is established in trampoline central area using ADAMS software.Due to
The contact that LifeMOD is established can only define rigid contact, and trampoline net is the elastic network(s) of nylon rope establishment, in order to solve model
Contact problems, establish rigid plate in trampoline central area.
The wire side finite element model that final S2 is established is as shown in Figure 1.It is verified, the item of the model coincidence loss ε less than 8%
Part.
(3) second step T1 is executed, in which:
DV model CasioEX700.
(4) second step T2 is executed, in which:
Analytical framework is as shown in Figure 2.The remote angle figure of sportsman's pressure network process is as shown in Figure 3.Sport video be sportsman from
Video image of the human body highest point moment to minimum point moment of touching net.
(5) second step T3 is executed.
(6) second step T4 is executed, in which:
Model after establishing joint connection on human skeleton model is as shown in Figure 4.The rounded portions being wherein connected between bone
Dividing is joint.
Model after establishing muscle on human skeleton model is as shown in Figure 5.Human body soft tissue is simplified to 118 fleshes
Group, is attached on the anatomic marker point on bone.
Manikin is established after kinematic pair as shown in Figure 6.
Human model is as shown in Figure 7 after coupling with wire side finite element model.
(7) third step U1 and U2 are executed.
Acquired results are analyzed as follows.
Execute second step T3 after, video recording analysis statistics indicate that, sportsman net moment be in hip bent knee position in the wrong,
Hip, knee angle are respectively 140,5 degree and 141.1 degree, and are networked in the case where keeping certain rigidity, can effectively be avoided in this way
Energy loss caused by action of giving, is conducive to make full use of the kinetic energy under human body placement in height, impact type pressure network, increase wire side to
Under deformation.
After executing third step U2, kinesiology data of the sportsman in this motion process, this test case can be obtained
Example define vertical axis (direction y) be it is parallel with cephalocaudal axis, perpendicular to the axis on ground；Sagittal axis (direction z) be in front-rear direction,
It intersects vertically with cephalocaudal axis；Frontal axis (direction x) is in left and right directions, is intersected vertically with the vertical axis and sagittal axis of body
Axis.It the net-fault moment is t with sportsman0Moment.
1, the contact force of sportsman and wire side
The contact force of sportsman and wire side is exactly sportsman's external force suffered in trampolining, sportsman in contact process
Gravitional force gradually switch to the elastic potential energy of wire side.Fig. 8 shows Foot pressure tress when sportsman and wire side contact, Ye Jijie
Touch.Statistics indicate that contact force and unequal when sportsman or so foot is contacted with wire side, with wire side contact process, left and right
Foot contact force is sequentially increased.About 3400N when left foot contact force maximum, about 2900N when right crus of diaphragm contact force maximum.Left and right foot
6.6 times and 5.6 times of its weight are respectively reached when contact force maximum.Obviously, sportsman is by bipod difference force method
Body twist provides power after jump.
2, the joint of lower extremity power of sportsman
LifeMOD software gives the stress of hip joint, knee joint, ankle-joint, as shown in Figure 9, Figure 10 respectively.
By the pass of lower limb hip joint, knee joint, the ankle-joint in this jump process of sportsman it can be seen from Fig. 9, Figure 10
Save power, it can be seen that the joint power of right lower extremity is greater than the joint power of left lower extremity.Each joint power of right lower extremity is during stance adjustment
It becomes larger, maximum value 3000-4000N is reached when contacting with wire side, it is rear slowly to reduce again.In each joint of left lower extremity, ankle-joint
The power minimum received is about 550N, and is not widely varied.The power of knee joint and hip joint gradually reduces before contacting with wire side,
Net-fault moment reaches minimum value 1050N and 1450N, is rapidly increased to 1600N after contacting with wire side.
Statistics indicate that sportsman, in net moment, each joint power of right lower extremity reaches maximum value, this entire human body keeps one
That determines rigidity enters network technology, can effectively avoid energy loss caused by any action of giving, is conducive to make full use of human body height
The kinetic energy that sky is fallen forms impact type pressure network, increases the downward deformation of wire side.Because the movement that the sportsman completes is that somersault adds
The movement of swivel, so its left and right is firmly unbalanced, left leg reaches minimum value in net moment, each joint power, has apparent slow
Rush phenomenon, have an effect after net and pedal gateway section power and increase to maximum value.Bipod wire side pressure inequality of shape at swivel power.
3, lower limb major muscles strength
The major muscles strength of study movement person's lower limb helps to analyze its movement rule.During the motion, sportsman
Gluteus maximus stress is as shown in figure 11.
It can be seen that the tensile elongation of muscle stretch power and muscle of the gluteus maximus in this jump process.Start in movement
It is that left and right gluteus maximus is maintained at 50N, as movement enters the net stage, the drawing force of gluteus maximus is gradually increased, and is touched net moment, is reached
To maximum value 380N, the rigidity of human body when this is conducive to keep networking.After contacting with wire side, the drawing force of gluteus maximus is gradually reduced
To 100N.In gluteus maximus muscle stretch power maximum, gluteus maximus extends about 28mm.The drawing force of left and right gluteus maximus, tensile elongation
Basis equalization.
Quadriceps muscle of thigh group has musculus lateralis externi and musculus lateralis interni, and quadriceps muscle of thigh group is in this jump process as can be seen from Figure 12
The tensile elongation of muscle stretch power and muscle.When beginning, the drawing force in outside is smaller in quadriceps muscle of thigh group, with stance adjustment by
Gradual change.Moment muscular strength of touching net reaches the low value point of pressure network process, and muscle group shows deformability shrinkage characteristic, contacts with wire side
Afterwards, the drawing force of quadriceps muscle of thigh group increases rapidly, and into Centripetal contract state, the opportunity of having an effect of the two leg muscle groups, movement become
Gesture tends to be synchronous with firmly degree.Quadriceps muscle of thigh is the muscle group of mainly having an effect in pressure network stage, and drawing force is big compared with other muscle, most
About 780N, tensile elongation is about 60mm at this time.
Gastrocnemius has musculus lateralis externi and musculus lateralis interni, as can be seen from Figure 13 muscle of the gastrocnemius muscle group in this jump process
The tensile elongation of drawing force and muscle.Drawing force on the inside of left gastrocnemius is always 190N.During stance adjustment, sura
After flesh becomes convergent force from pulling force and become drawing force, yield work state is presented in muscle.Touching net, moment drawing force reaches
Peak value 220N, after networking, muscle is transferred to Centripetal contract, and muscular strength is gradually reduced by drawing force switchs to convergent force, and minimum reaches-
300N reinforces ankle dorsal flexion, wire side is pressed to nadir.Muscle length variation at this time is 25mm.
It is seen from figure 14 that the tensile elongation of muscle stretch power and muscle of the musculus soleus in this jump process.
It is initially that right musculus soleus is maintained at 75N in movement, as the adjustment of posture is gradually increased, touching net, moment reaches 380N,
Enter the Centripetal contract stage after contacting with wire side, muscle length shortens, and drawing force gradually decreases to 75N, participates in ankle-joint back
Pressure network movement in the wrong, tensile elongation up to 28mm.The myotility of left musculus soleus maintains always the low drawing force of 75N
State.
In conclusion video recording analysis statistics indicate that, sportsman net moment knee, hip, shoulder joint keep certain bending appearance
What gesture, i.e. body kept certain rigidity enters network technology.Analogue data shows that sportsman's sole and wire side contact force or so are uneven
About 3400N when Deng, left foot foot contact force maximum, about 2900N when right crus of diaphragm contact force maximum.Respectively reach 6.6 times of weight
With 5.6 times.During pressure network, different features is presented in lower limb each joint power in left and right, net moment, right each joint power of leg reach most
Big value has rigid networking feature, and left each joint power of leg reaches minimum value, there is apparent buffering phenomenon.Two leg gluteus maximus, stock four
Head flesh, the opportunity of having an effect of gastrocnemius, movement tendency tend to be synchronous with firmly degree, gluteus maximus, quadriceps muscle of thigh maximal force difference
Reach 380N and 780N, is the muscle group of mainly having an effect in pressure network stage.After gastrocnemius becomes convergent force from pulling force and become drawing force,
Drawing force peak value reaches 220N, and convergent force reaches -300N.Exert oneself degree, opportunity and mode of the musculus soleus of two legs has obviously
Difference is the reason for causing two leg joint power different with wire side contact force, provides power for the body twist after emptying.
This test case is realized using the comprehensive wire side finite element model and Human model method for establishing trampoline
The dynamics simulation that people, net couple, is successfully made the Dynamics Simulation Analysis of sportsman's trampoline net take-off movement, obtains simultaneously
Sportsman's related muscles force data and wire side stress response data, for study movement person's trampoline take-off movement technology provide according to
According to.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (8)
1. a kind of trampoline take-off movement simulating analysis for coupling simulation based on kinesiology and wire side finite element, feature
It is, comprising the following steps:
The first step, the wire side finite element model for establishing trampoline:
S1. type, quantity and the position of spring around trampoline net are counted, and measures the coefficient of elasticity of various types of spring；It is right
Dead load mechanical property testing is carried out at trampoline net center, obtains the pass of sinking displacement at dead load and trampoline net center
System；
S2. the wire side finite element model for establishing trampoline is combined using ANSYS software and ADAMS software, wherein in the model mould
The rigid plate of the simulation of pre-set dimension is established in the central area of quasi- trampoline net；
Second step establishes Human model, and Human model is coupled with wire side finite element model:
T1. two DVs, the camera site of fixed each DV are used, and sets the shooting speed of each DV
Degree；
T2. analytical framework is placed on trampoline net, two DVs simultaneously shoot analytical framework, and are solved
Analyse frame video；Analytical framework is removed later, does trampolining movement on same trampoline net by target sportsman, while by
Two DVs are shot respectively, and obtain sport video；It include the pressure network process of target sportsman in the sport video,
The pressure network process is the process to reduce as far as possible to trampoline net of touching net since the sportsman；
T3. APAS analysis software is used, analytical framework video and sport video are parsed respectively, and with the institute of analytical framework
There is the coordinate in each joint of preset mark point spotting sportsman, and then obtains the kinematic data in each joint of target sportsman；
The kinematic data is converted into the slf formatted file that LifeMOD software can identify；
T4. run LifeMOD software and the kinematic data that inputs in file obtained by T3 and the human body for establishing target sportsman it is dynamic
Then mechanical model connects the trampoline net creation that the foot of manikin contained by Human model is simulated with the first step
The coupling of Human model and wire side finite element model is realized in touching；
Third step, the kinesiology data that target sportsman trampoline take-off movement is obtained by simulation analysis:
U1. gravity is added on the manikin contained by Human model using LifeMOD software, later according to second step T3
Gained kinematic data carries out IK Solvers emulation, and is remembered respectively by each joint unit of manikin and each muscle unit
Record the exercise data of itself；
U2. tracking factor is established on manikin using LifeMOD software, later according to the recorded driving human mould of U1
Type carries out forward dynamics simulation analysis, and obtains kinesiology data；Simulating analysis terminates；
The detailed process of first step S2 are as follows:
Firstly, simulating trampoline net using ANSYS software, and obtain the modal neutral file of MNF format；
Then, the ADAMS/Flex module that modal neutral file is imported to ADAMS software, makes ADAMS software according in the mode
Property file analogy trampoline net；
Then, using ADAMS software, several mark points are established around the trampoline net of simulation, are built at the trampoline net edge
Node corresponding with each mark point is found, and connects corresponding mark point and node to simulate spring；The type of these simulation springs,
Quantity and position are identical as the statistical result of S1, and the coefficient of elasticity of various types of simulation spring is identical as the measurement result of S1；
Finally, establishing the rigid plate of the simulation of pre-set dimension in the central area of the trampoline net, and will using ADAMS software
The rigid plate edge is locked with the trampoline net；
The wire side finite element model that first step S2 is established meets following condition:
Using ADAMS software, dead load A is loaded at the trampoline net center of simulation, and simulate the sinking watching of trampoline net,
Obtain the sinking displacement δ a at the trampoline net center；Later, according to sinking position at dead load obtained by S1 and trampoline net center
The relationship of shifting, practical sinking displacement δ t at the trampoline net center of static loading experiment when obtaining load dead load A；It is missed finally, calculating
DifferenceError ε is less than 8%.
2. the trampoline take-off movement according to claim 1 for coupling simulation based on kinesiology and wire side finite element emulates
Analysis method, characterized in that the modal neutral file contains the component parameter of trampoline net；The component parameter includes: soft
The geometric parameter of property body, which includes the position coordinates and connectivity of each node in trampoline net；It is each in trampoline net
The quality and rotary inertia of node；Each rank mode of trampoline net；The mode generalized mass and generalized velocity of trampoline net.
3. the trampoline take-off movement according to claim 1 for coupling simulation based on kinesiology and wire side finite element emulates
Analysis method, characterized in that the detailed process of second step T1 are as follows:
Using two DVs, the camera site of fixed each DV puts down the primary optical axis of each DV respectively
Row in trampoline net and respectively with cross the vertical straight line intersection of trampoline net central point, and make two DV primary optical axis it
Between angle be 90 °, and a DV is located at trampoline front, and another DV is located at trampoline side；Meanwhile it will be each
The shooting speed of DV is respectively set as 100 frames/second.
4. the trampoline take-off movement according to claim 1 for coupling simulation based on kinesiology and wire side finite element emulates
Analysis method, characterized in that the detailed process of second step T4 are as follows:
It is successively carried out using LifeMOD software: human skeleton model is established according to the human figure parameter of target sportsman；In people
Joint connection and muscle are established on body skeleton model, obtain manikin；Kinematic data in file obtained by T3 is loaded onto
On manikin, molility factor is added on manikin and drives in manikin each node and model block along by transporting
The dynamic trajectory line for learning data formation is moved, to establish kinematic pair；Equilibrium analysis is run, enables manikin according to movement
Secondary track movement, to obtain Human model；Create the foot and first step institute mould of human body in Human model
The coupling of Human model and wire side finite element model is realized in contact between quasi- trampoline net.
5. the trampoline take-off movement according to claim 4 for coupling simulation based on kinesiology and wire side finite element emulates
Analysis method, characterized in that in T2, analytical framework is three-dimensional DLT radial frame；In T3, APAS analysis software is Ariel
The Ariel Performance Analysis System motion analysis system of Dynamics company exploitation；In T4, target movement
The human figure parameter of member includes gender, height, weight, age.
6. the trampoline take-off movement according to claim 1 for coupling simulation based on kinesiology and wire side finite element emulates
Analysis method, characterized in that in third step U2, the kinesiology data are the data changed over time；The human body
Dynamics data includes contact force data of the target sportsman with trampoline net；The joint of lower extremity force data of target sportsman；Mesh
Mark the lower limb muscles power and muscle stretch length data of sportsman.
7. the trampoline take-off movement according to claim 6 for coupling simulation based on kinesiology and wire side finite element emulates
Analysis method, characterized in that contact force includes left foot contact force and right crus of diaphragm contact force；
Joint of lower extremity power include left hip joint power, right hip joint power, left knee joint power, right knee joint power, left ankle-joint power and
Right ankle-joint power；
Lower limb muscles power and muscle stretch length include left gluteus maximus muscular force and muscle stretch length, right gluteus maximus muscular force and
Muscular force and flesh on the outside of muscle stretch length, left quadriceps group inside muscular force and muscle stretch length, left quadriceps group
Muscular force and muscle on the outside of meat tensile elongation, right quadriceps muscle of thigh group inside muscular force and muscle stretch length, right quadriceps muscle of thigh group
Muscular force and muscle stretch length, the right side on the outside of tensile elongation, left gastrocnemius inside muscular force and muscle stretch length, left gastrocnemius
Muscular force and muscle stretch length, left musculus soleus flesh on the outside of gastrocnemius inside muscular force and muscle stretch length, right gastrocnemius
Meat power and muscle stretch length and right soleus muscle power and muscle stretch length.
8. the trampoline take-off movement according to claim 1 for coupling simulation based on kinesiology and wire side finite element emulates
Analysis method, characterized in that in second step T3, using APAS analysis software parsing after be also obtained target sportsman hip joint and
Kneed angle change data.
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