People often complete tasks using one hand for the task and one hand for support. These one-handed support tasks can be found in many different types of jobs, such as automotive assembly jobs. Optimization-based posture prediction has proven to be a valid tool in predicting the postures necessary to complete the tasks, but the related external support forces have been prescribed and not predicted. This paper presents a method in which the optimal posture and related supporting hand forces can be predicted simultaneously using optimization and stability analysis techniques. Postures are evaluated using a physics-based human performance measure (HPM) while external forces are assessed using stability analysis. The physics-based performance measures are based on joint torque. Stability is analyzed using criteria based on a 3D zero moment point (ZMP). The human model used in the prediction contains 56 degrees of freedom and is based on a 50th percentile female in stature. Tasks based on common automotive assembly one-handed tasks found in literature are considered as examples to test the proposed method. Overall, the predicted supporting hand forces have good correlation with experimentally measured forces.

References

References
1.
Na
,
S.
,
Lim
,
S.
,
Choi
,
H.-S.
, and
Chung
,
M. K.
,
2005
, “
Evaluation of Driver's Discomfort and Postural Change Using Dynamic Body Pressure Distribution
,”
Int. J. Ind. Ergon.
,
35
(
12
), pp.
1085
1096
.10.1016/j.ergon.2005.03.004
2.
Hostens
,
I.
,
Papaioannou
,
G.
,
Spaepen
,
A.
, and
Ramon
,
H.
,
2001
, “
Buttock and Back Pressure Distribution Tests on Seats of Mobile Agricultural Machinery
,”
Applied Ergonomics
,
32
(
4
), pp.
347
355
.10.1016/S0003-6870(01)00013-8
3.
Aissaoui
,
R.
,
Kauffmann
,
C.
,
Dansereau
,
J.
, and
de Guise
,
J. A.
,
2001
, “
Analysis of Pressure Distribution at the Body-Seat Interface in Abled-Bodied and Paraplegic Subjects Using a Deformable Active Contour Algorithm
,”
Med. Eng. Phys.
,
23
(
6
), pp.
359
367
.10.1016/S1350-4533(01)00052-2
4.
Ferguson-Pell
,
M.
, and
Cardi
,
M. D.
,
1993
, “
Prototype Devlopment and Comparitive Evaluation of Wheelchair Pressure Mapping System
,”
Assist Technol.
,
5
(
2
), pp.
78
91
.10.1080/10400435.1993.10132213
5.
Carcone
,
S. M.
, and
Keir
,
P. J.
,
2007
, “
Effects of Backrest Design on Biomechanics and Comfort During Seated Work
,”
Appl. Ergon.
,
38
(
6
), pp.
755
764
.10.1016/j.apergo.2006.11.001
6.
Brienza
,
D. M.
,
Lin
,
C.-T.
, and
Karg
,
P. E.
,
1999
, “
A Method for Custom-Contoured Cushion Design Using Interface Pressure Measurements
,”
IEEE Trans. Rehabil. Eng.
,
7
(
1
), pp.
99
108
.10.1109/86.750558
7.
Hobson
,
D. A.
,
1992
, “
Comparitive Effects of Posture on Pressure and Shear at the Body-Seat Interface
,”
J. Rehabil. Res.
,
29
(
4
), pp.
21
31
.10.1682/JRRD.1992.10.0021
8.
Ferguson
,
S. A.
,
Gaudes-MacLaren
,
L. L.
,
Marras
,
W. S.
,
Waters
,
T. R.
, and
Davis
,
K. G.
,
2002
, “
Spinal Loading When Lifting From Industrial Storage Bins
,”
Ergonomics
,
45
(
6
), pp.
399
314
.10.1080/00140130210123507
9.
Kingma
,
I.
, and
van Dieën
,
J. H.
,
2004
, “
Lifting Over an Obstacle: Effects of One Handed Lifting and Hand Support on Trunk Kinematics and Low Back Loading
,”
J. Biomech.
,
37
(
2
), pp.
249
255
.10.1016/S0021-9290(03)00248-3
10.
Godin
,
C.
,
Cashaback
,
J.
,
Cort
,
J.
,
Potvin
,
J.
, and
Stephens
,
A.
,
2008
, “
An Estimation of Supporting Hand Forces for Common Automotive Assembly Tasks
,”
SAE
Technical Paper No. 2008-01-1914.10.4271/2008-01-1914
11.
Gragg
,
J.
,
Yang
,
J.
, and
Howard
,
B.
,
2012
, “
Hybrid Method for Driver Accommodation Using Optimization-Based Digital Human Models
,”
Comput.-Aided Des.
,
44
(
1
), pp.
29
39
.10.1016/j.cad.2010.11.009
12.
Gragg
,
J.
,
Yang
,
J.
, and
Long
,
J. D.
,
2011
, “
Optimisation-Based Approach for Determining Driver Seat Adjustment Range for Vehicles
,”
Int. J. Veh. Des.
,
57
(
2/3
), pp.
148
161
.10.1504/IJVD.2011.044716
13.
Kim
,
J. H.
,
Yang
,
J.
, and
Abdel-Malek
,
K.
,
2009
, “
Multi-Objective Optimisation Approach for Predicting Seated Posture Considering Balance
,”
Int. J. Veh. Des.
,
51
(
3/4
), pp.
287
291
.10.1504/IJVD.2009.027957
14.
Marler
,
R. T.
,
Arora
,
J. S.
,
Yang
,
J.
,
Kim
,
H.-J.
, and
Abdel-Malek
,
K.
,
2009
, “
Use of Multi-Objective Optimization for Digital Human Posture Prediction
,”
Eng. Optim.
,
41
(
10
), pp.
925
943
.10.1080/03052150902853013
15.
Marler
,
T.
,
Knake
,
L.
, and Johnson, R.,
2010
, “
Optimization-Based Posture Prediction for Analysis of Box Lifting Tasks
,”
Third International Conference on Digital Human Modeling
(
ICDHM 2011
), Orlando FL, July 9–14, pp.
151–160
.10.1007/978-3-642-21799-9_17
16.
Marler
,
R. T.
,
Rahmatalla
,
S.
,
Shanahan
,
M.
, and
Abdel-Malek
,
K.
,
2005
, “
A New Discomfort Function for Optimization-Based Posture Prediction
,”
SAE
Technical Paper No. 2005-01-2680.10.4271/2005-01-2680
17.
Yang
,
J.
,
Marler
,
T.
,
Arora
,
J.
, and
Abdel-Malek
,
K.
,
2004
, “
Multi-Objective Optimization for Upper Body Posture Prediction
,”
10th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference
, Albany, NY, August 30–September 1,
AIAA
Paper No. 2004-4506.10.2514/6.2004-4506
18.
Yang
,
J.
,
Marler
,
T.
, and
Rahmatalla
,
S.
,
2011
, “
Multi-Objective Optimization-Based Method for Kinematic Posture Prediction: Development and Validation
,”
Robotica
,
29
(
2
), pp.
245
253
.10.1017/S026357471000010X
19.
Xiang
,
Y.
,
Arora
J. S.
, and
Abdel-Malek
,
K.
,
2009
, “
Optimization-Based Motion Prediction of Mechanical Systems: Sensitivity Analysis
,”
Struct. Multidiscip. Optim.
,
37
(
6
), pp.
595
608
.10.1007/s00158-008-0247-2
20.
Yang
,
J.
, and
Kim
J. H.
,
2010
, “
Static Joint Torque Determination of a Human Model for Standing and Seating Tasks Considering Balance
,”
ASME J. Mech. Rob.
,
2
(
3
), p.
031005
.10.1115/1.4001782
21.
Yang
,
J.
,
Xiang
,
Y.
, and Kim, J.,
2009
, “
Determining the Static Joint Torques of a Digital Human Model Considering Balance
,”
ASME International Design Engineering Technical Conference
, San Diego, CA, August 30–September 2,
ASME
Paper No. DETC2009-87529.10.1115/DETC2009-87529
22.
Hollerbach
,
J. M.
,
1980
, “
A Recursive Lagrangian Formulation of Manipulator Dynamics and a Comparative Study of Dynamics Formulation Complexity
,”
IEEE Trans. Syst., Man, Cybern.
,
10
(
11
), pp.
730
736
.10.1109/TSMC.1980.4308393
23.
Vukobratović
,
M.
, and
Borovac
,
B.
,
2004
, “
Zero-Moment Point—Thirty Five Years of Its Life
,”
Int. J. Humanoid Rob.
,
1
(
1
), pp.
157
173
.10.1142/S0219843604000083
24.
Goswami
,
A.
,
1999
, “
Postural Stability of Biped Robots and the Foot-Rotation Indicator (FRI) Point
,”
Int. J. Rob. Res.
,
18
(
6
), pp.
523
533
.10.1177/02783649922066376
25.
Howard
,
B.
, and
Yang
,
J.
,
2012
, “
A Stability Criterion for Human Seated Tasks With Given Postures
,”
Int. J. Humanoid Rob.
,
9
(
3
), p.
1250015
.10.1142/S0219843612500156
26.
Howard
,
B.
,
Yang
,
J.
, and
Yang
,
G.
,
2012
, “
Prediction of Supporting Hand Forces for Common Automotive Assembly Tasks Based on Optimization and Stability Techniques for Given Posture
,”
ASME International Design and Engineering Technical Conference
, Chicago, IL, August 12–15,
ASME
Paper No. DETC2012-70678.10.1115/DETC2012-70678
27.
Denavit
,
J.
, and
Hartenberg
,
R. S.
,
1955
, “
A Kinematic Notation for Lower-Pair Mechanisms Based on Matrices
,”
ASME J. Appl. Mech.
,
22
(
2
), pp.
215
221
.
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