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Exact(4)
There is only one constraint per link of the snake robot. 5.
This was achieved by making the first link of the snake robot behave similarly to fixed-base (due to its shape and mass), but the results cannot be extended to the case of a general snake robot.
The mass of the object (m_{mathrm{obj}}) will be denoted as a multiple of the mass of a link of the snake robot as (m_{mathrm{obj}} = kappa m_{i}).
During the experiment, reflective markers were mounted on the head link of the snake robot in order to measure the position (px,N,py,N) and orientation (θ N ) of the head.
Similar(56)
If all links of the snake robot have the same mass m, then the inertia matrix of the snake robot can be factored as (varvec{M}_{s} := m bar{varvec{M}}), and the inertia matrix of an object as (varvec{I}_{mathrm{obj}} = m_{mathrm{obj}} bar{varvec{I}}_{mathrm{obj}}), where the new inertia matrices (bar{varvec{M}}) and (bar{varvec{I}}_{mathrm{obj}}) correspond to inertia matrices with unitary mass.
Moreover, from Figure 2, it can be seen that the head link of the physical snake robot does not touch the ground since the ground contact points occur at the location of the joints.
A year ago, researchers led by David Martill of the University of Portsmouth in the United Kingdom reported in Science that the fossil, which they named Tetrapodophis amplectus (for four-footed snake), was a missing link in the snake evolutionary tree.
In [9], position and path following controllers are proposed for the case where some, but not all, of the snake robot links are subject to sideslip constraints.
In this case, the kinematics of the snake robot corresponds to a planar snake robot with links of length (2l = 0.18) m and mass (m approx 0.8) kg.
"He was the head of the snake.
"She's the head of the snake.
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