A new non-orthogonal decomposition method to determine effective torques for three-dimensional joint rotation

2007 ◽  
Vol 40 (4) ◽  
pp. 871-882 ◽  
Author(s):  
Masaya Hirashima ◽  
Kazutoshi Kudo ◽  
Tatsuyuki Ohtsuki
Keyword(s):  
Decomposition Method ◽  
Three Dimensional ◽  
Orthogonal Decomposition ◽  
Joint Rotation

Prediction of Ice Shape for Three-Dimensional Engine Inlet Based on the Proper Orthogonal Decomposition Method

2014 ◽  
Vol 1008-1009 ◽  
pp. 1011-1015
Author(s):  
Xiao Bin Shen ◽  
Zuo Dong Mu ◽  
Gui Ping Lin ◽  
Yue Zhou
Keyword(s):  
Numerical Calculation ◽  
Proper Orthogonal Decomposition ◽  
Decomposition Method ◽  
Three Dimensional ◽  
Orthogonal Decomposition ◽  
Ice Accretion ◽  
3D Engine ◽  
Calculation Results ◽  
Ice Shapes ◽  
Proper Orthogonal

To increase the prediction speed of ice accretion on the 3D engine inlet, the Proper Orthogonal Decomposition (POD) method was introduced. Taking the ice shapes from CFD numerical calculation results as samples, in view of the change of icing temperature, the procedures of predicting the ice shapes by POD method were introduced, which used ice shapes’ coordinates and ice accretion height as compute parameters, respectively. The POD and CFD ice shapes were found coincident, which indicates that the POD method can fast and accurately calculate the 3D engine inlet ice shapes. The results from the two different POD parameters were shown and compared, and the ice shapes were nearly the same, which means they have the same effect. However, the POD method based on ice accretion height is simpler and more appropriate

INTRA-SESSION RELIABILITY AND REPEATABILITY OF KNEE KINEMATICS IN SUBJECTS WITH ACL DEFICIENCY DURING STAIR ASCENT

2017 ◽  
Vol 17 (06) ◽  
pp. 1750092
Author(s):  
MARYAM HAJIZADEH ◽  
ALIREZA HASHEMI OSKOUEI ◽  
FARZAN GHALICHI ◽  
GISELA SOLE
Keyword(s):  
Knee Joint ◽  
Cruciate Ligament ◽  
Intraclass Correlation ◽  
Force Plate ◽  
Three Dimensional ◽  
Knee Kinematics ◽  
Compensatory Mechanisms ◽  
Joint Rotation ◽  
Stair Ascent ◽  
Acl Deficient

Analysis of knee kinematics and ground reaction forces (GRFs) is widely used to determine compensatory mechanisms of people with anterior cruciate ligament deficiency (ACLD). However, the practicality of the measurements is subject to their reliability during different trials. This study aims to determine the reliability and repeatability of knee joint rotations and GRFs in people with ACLD during stair ascent. Eight participants with unilateral ACL-deficient knees performed five trials of stair ascent with each leg. The movements were captured by VICON motion analysis system, and GRF components were recorded using force plate. Three-dimensional tibiofemoral joint rotations were calculated. Intraclass correlation coefficient (ICC), standard error of measurement (SEM) and coefficient of multiple correlation (CMC) were calculated ACL-deficient legs showed lower absolute reliability during swing ([Formula: see text]–6.4) than stance phase ([Formula: see text]–2.2) for knee joint rotations. Moderate to high average measure ICCs (0.59–0.98), relative reliability, were achieved for injured and uninjured sides. The results also demonstrated high repeatability for the knee joint rotation ([Formula: see text]–0.97) and GRF ([Formula: see text]–0.99). The outcomes of this study confirmed the consistency and repeatability of the knee joint rotations and GRFs in ACL-deficient subjects. Additionally, ACL-deficient legs exhibited similar levels of reliability and repeatability compared to contralateral legs.

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