TY - GEN
T1 - Prediction of on-stride walking for pregnant women
AU - Yang, Jingzhou
AU - Zou, Qiuling
PY - 2010
Y1 - 2010
N2 - Pregnant women's size, shape, and weight changes have significant effects on their walking stability. Traditionally, experiments are used to study the effects of subjects, but it is time consuming and expensive. This paper presents an optimization-based pregnant women walking simulation with one-stride formulation. The pregnant woman's model with 55 degrees of freedom (DOFs) is used, including 6 global DOF's and 49 human body DOF's. The dynamic equations of motion are based on the recursive dynamics. Without the constraint of symmetry of the human body between two steps within one walking cycle, the study is based on biomechanical, human kinematic, and dynamic properties to perform the one-stride simulation, which represent the holonomic and non-holonomic constraints in walking simulation. This forms a nonlinear optimization problem. The summation of all joint actuator torques squared within one stride is the cost function. Nine determinant DOF's are used to analyze the kinematics and three for dynamics. Three cases (non-pregnancy, 6 month, and 9 month pregnancy) are adopted for the test and investigation. The simulation results show that during the course of pregnancy, pregnant women's bodies dynamic and kinematic properties change and thus affect their walking and stability.
AB - Pregnant women's size, shape, and weight changes have significant effects on their walking stability. Traditionally, experiments are used to study the effects of subjects, but it is time consuming and expensive. This paper presents an optimization-based pregnant women walking simulation with one-stride formulation. The pregnant woman's model with 55 degrees of freedom (DOFs) is used, including 6 global DOF's and 49 human body DOF's. The dynamic equations of motion are based on the recursive dynamics. Without the constraint of symmetry of the human body between two steps within one walking cycle, the study is based on biomechanical, human kinematic, and dynamic properties to perform the one-stride simulation, which represent the holonomic and non-holonomic constraints in walking simulation. This forms a nonlinear optimization problem. The summation of all joint actuator torques squared within one stride is the cost function. Nine determinant DOF's are used to analyze the kinematics and three for dynamics. Three cases (non-pregnancy, 6 month, and 9 month pregnancy) are adopted for the test and investigation. The simulation results show that during the course of pregnancy, pregnant women's bodies dynamic and kinematic properties change and thus affect their walking and stability.
KW - Optimization
KW - Pregnant women
KW - Walking cycle
KW - Walking stride
UR - http://www.scopus.com/inward/record.url?scp=84881409074&partnerID=8YFLogxK
U2 - 10.1115/IMECE2010-39929
DO - 10.1115/IMECE2010-39929
M3 - Conference contribution
AN - SCOPUS:84881409074
SN - 9780791844267
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
SP - 555
EP - 563
BT - ASME 2010 International Mechanical Engineering Congress and Exposition, IMECE 2010
Y2 - 12 November 2010 through 18 November 2010
ER -