Table 2 The observations of the physical parameters.

From: Cluster formation tracking of networked perturbed robotic systems via hierarchical fixed-time neural adaptive approach

Mass (\(\mathrm{{kg}}\))

Length (\(\mathrm{{m}}\))

COM (\(\mathrm{{m}}\))

\({{\hat{m}}_i} \!=\! {({{\hat{m}}_{i1}},{{\hat{m}}_{i2}})^T}\)

\({{\hat{l}}_{i1}} = {({{\hat{l}}_{i1}},{{\hat{l}}_{i2}})^T}\)

\({{\hat{\chi }} _{i2}} \!=\! {({{\hat{\chi }} _{i1}},{{\hat{\chi }} _{i2}})^T}\)

\({{\hat{m}}_{i1}} = 1.16 + 0.03i\)

\({{\hat{l}}_{i1}} \!=\! 2.58 + 0.04i\)

\({{\hat{\chi }} _{i1}} = 1.24 + 0.02i\)

\({{\hat{m}}_{i2}} = 1.14 + 0.02i\)

\({{\hat{l}}_{i2}} \!=\! 2.54 + 0.02i\)

\({{\hat{\chi }} _{i2}} = 1.12 + 0.01i\)