文档介绍：Available online at hanism
and
Machine Theory
Mechanism and Machine Theory 43 (2008) 376–389
ate/mechmt
Mechanism, design and motion control of a linkage
chewing device for food evaluation
. Xu a,*, D. Lewis a, . Bronlund a, . Morgenstern b
a Institute of Technology and Engineering, College of Sciences, Massey University, New Zealand
b New Zealand Institute for Crop and Food Research Ltd., New Zealand
Received 30 January 2007; received in revised form 12 March 2007; accepted 16 March 2007
Available online 27 April 2007
Abstract
A linkage-based chewing device is proposed to perform standardised chewing for use in food evaluation. The linkage
for chewing is firstly specified in terms of the trajectory of the first molar and the chewing force, according to the in vivo
measurements of the human chewing ranging from grinding (or lateral chewing) to crunching (or vertical chewing). A four-
bar linkage is synthesized to achieve the lateral chewing trajectory of the molar, and by adjusting the ground link length to
achieve any trajectory between the lateral and vertical chewing. A six-bar crank-slider linkage is then designed to guide the
molar teeth moving in a set orientation while still following the chewing trajectory produced by the four-bar linkage. The
chewing device based on the six-bar linkage is constructed with inclusion of anatomically correct teeth for reducing the
food particle size, a food retention device for collecting the food particles being chewed and a shock absorber for prevent-
ing excessive chewing force. The linkage chewing device is evaluated by simulations of kinematics and dynamics and actual
measurements of the trajectory and chewing force. For the motion control of the actuator, the chewing velocity along the
trajectory is also profiled for occlusal phase and opening/closing phase of the chewing, and the variations of the chewing
for different foods are set in a GUI (graphical user interface) in Labview.