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gates, the smaller the initial closing force, the better the customers’ affect, and the
initial force should be smaller as the initial close angle is larger. In addition, if there is a
force in the middle of closing more than the initial force, customers’ affect was worse.
Last, the longer the steady state of closing force, the worse the customers’ affect.
Likewise, in the force graphs of opening tail gates, the smaller the initial opening
force, the better the customers’ affect. In addition, the longer the range of angle of the
force graph, the worse the customers’ affect
From this analysis, we selected some mechanical properties ...