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Table 1 Control increments, iterations and total time during constrained and unconstrained tests

From: Evaluation of three force-position hybrid control methods for a robot-based biological joint-testing system

Control method

AP test

VV test

0° flexion

30° flexion

0° flexion

30° flexion

N

n

T (s)

N

n

T (s)

N

n

T (s)

N

n

T (s)

CT

189

(1)

189

(1)

123

(1)

191

(1)

191

(1)

120

(0)

101

(4)

101

(4)

80

(2)

117

(1)

117

(1)

96

(0)

FPH

211

(1)

211

(1)

141

(1)

205

(4)

205

(4)

129

(2)

98

(5)

98

(5)

78

(2)

115

(0)

115

(0)

95

(0)

FPA

239

(2)

1135

(28)

689

(11)

214

(2)

1001

(8)

590

(3)

113

(1)

1164

(11)

680

(4)

127

(0)

1139

(9)

596

(4)

FPHFM

267

(10)

1024

(30)

615

(11)

210

(8)

844

(24)

520

(10)

112

(2)

1064

(15)

635

(6)

125

(1)

1110

(3)

577

(1)

  1. Means (standard deviations) of the number of increments, total number of control iterations and total time during the constrained test (CT), and unconstrained tests using force-position hybrid control (FPH), force-position alternate control (FPA), and force-position hybrid control & force-moment control (FPHFM) for AP and VV tests at 0° and 30° knee flexion. CT and FPH needed a similar number of control iterations (total time) while FPHFM needed more and FPA needed even more
  2. N, number of increments; n, total number of control iterations; T, total time