A study on quadruped mobile robots

H Taheri, N Mozayani - Mechanism and Machine Theory, 2023 - Elsevier
In recent years, quadruped mobile robots' development had experienced rapid progress,
which has subsequently increased their usage in many human-assisted applications …

The effects of mode shapes on the temporal response of flexible closed-loop linkages under the impulse excitation

AM Shafei, MM Riahi - Mechanical Systems and Signal Processing, 2022 - Elsevier
In this paper, by relying on the Timoshenko beam theory and the assumed modes method,
we have presented a dynamic modeling of the closed-loop flexible linkages in the non …

Kinetics of planar constrained robotic mechanisms with multiple closed loops: An experimental study

A Zahedi, AM Shafei, M Shamsi - Mechanism and Machine Theory, 2023 - Elsevier
This paper presents a direct and straightforward approach for deriving the kinetic equations
of the planar mechanisms comprising multiple kinematic closed loops. What distinguishes …

Application of hybrid robotic systems in crop harvesting: kinematic and dynamic analysis

A Zahedi, AM Shafei, M Shamsi - Computers and Electronics in Agriculture, 2023 - Elsevier
Harvesting of agricultural crops, especially when the ripe products have to be picked one by
one, has always been a major concern of farmers and growers. Consequently, the use of …

Frictional impact-contacts in multiple flexible links

M Ahmadizadeh, AM Shafei, R Jafari - International Journal of …, 2021 - World Scientific
Multiple impacts of 2D (planar) open-loop robotic systems composed of n elastic links and
revolute joints are studied in this paper. The dynamic equations of motion for such systems …

On the dynamics of multi-closed-chain robotic mechanisms

A Zahedi, AM Shafei, M Shamsi - International Journal of Non-Linear …, 2022 - Elsevier
Here, a recursive technique based on the Gibbs–Appell (G–A) and the Newton's impact
formulas for dynamic modeling of multi-closed-loop mechanisms has been presented. Each …

Dynamic analysis of multiple inclined and frictional impact-contacts in multi-branch robotic systems

M Ahmadizadeh, AM Shafei, M Fooladi - Applied Mathematical Modelling, 2021 - Elsevier
In this paper, the dynamic behavior of a multi-branch robotic mechanism made up of n rigid
links and suspended inside an enclosure with curved walls has been investigated. The …

A novel recursive formulation for dynamic modeling and trajectory tracking control of multi-rigid-link robotic manipulators mounted on a mobile platform

AM Shafei, H Mirzaeinejad - … , Part I: Journal of Systems and …, 2021 - journals.sagepub.com
This article establishes an innovative and general approach for the dynamic modeling and
trajectory tracking control of a serial robotic manipulator with n-rigid links connected by …

A recursive algorithm for dynamics of multiple frictionless impact-contacts in open-loop robotic mechanisms

M Ahmadizadeh, AM Shafei, M Fooladi - Mechanism and Machine Theory, 2020 - Elsevier
In this paper, the phenomenon of multiple impact-contacts has been dynamically modeled
for an open kinematic chain with rigid links and revolute joints. The dynamic equations of the …

A new method for finding the proper initial conditions in passive locomotion of bipedal robotic systems

R Fazel, AM Shafei, SR Nekoo - Communications in Nonlinear Science and …, 2024 - Elsevier
In this paper, the walking motion of a biped robot consisting of upper and lower body
members (arms, legs, upper trunk and neck) on an inclined surface is analyzed …