Open Access

Table 1

Three-dimensional assembly contact state of the frame.

Model Three-dimensional contact state
Frame tilted to the left One-point contact (L-1)
 
 
 
  Two-point contact (L-5) α1 ∈ [90°, 270°], α2 ∈ [0°, 90°] ∪ [270°, 360°]
r2 : (x2, y2, −h2)
  α3 ∈ [90°, 270°], α4 ∈ [0°, 90°] ∪ [270°, 360°]
r4 : (x4, y4, −h4)
  α1 ∈ [90°, 270°], α3 ∈ [90°, 270°]
r3 : (x3, y3, 0)
  α1 ∈ [90°, 270°], α4 ∈ [0°, 90°] ∪ [270°, 360°]
r4 : (x4, y4, −h4)
  α2 ∈ [0°, 90°] ∪ [270°, 360°], α3 ∈ [90°, 270°]
r3 : (x3, y3, 0)
  α2 ∈ [0°, 90°] ∪ [270°, 360°], α4 ∈ [0°, 90°] ∪ [270°, 360°]
r4 : (x4, y4, −h4)
Frame tilted to the right One-point contact (R-1)
 
 
 
  Two-point contact (R-5) α1 ∈ [90°, 270°], α2 ∈ [0°, 90°] ∪ [270°, 360°]
r2 : (x2, y2, 0)
  α3 ∈ [90°, 270°], α4 ∈ [0°, 90°] ∪ [270°, 360°]
r4 : (x4, y4, 0)
  α1 ∈ [90°, 270°], α3 ∈ [90°, 270°]
r3 : (x3, y3, −h3)
  α1 ∈ [90°, 270°], α4 ∈ [0°, 90°] ∪ [270°, 360°]
r4 : (x4, y4, 0)
  α2 ∈ [0°, 90°] ∪ [270°, 360°], α3 ∈ [90°, 270°]
r3 : (x3, y3, −h3)
  α2 ∈ [0°, 90°] ∪ [270°, 360°], α4 ∈ [0°, 90°] ∪ [270°, 360°]
r4 : (x4, y4, 0)

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