Last edited by Gardazragore
Wednesday, July 29, 2020 | History

2 edition of Response to centrifugal loading of a manipulator link with joint friction. found in the catalog.

Anastasios Kessaris

## by Anastasios Kessaris

Published .
Written in English

The Physical Object
Pagination104 leaves
Number of Pages104
ID Numbers
Open LibraryOL18569160M

M. M. Fateh and S. Fateh / A Precise Robust Fuzzy Control of Robots Using Voltage Control Strategy 65 2 Modeling The dynamics of manipulator is expressed as D(µ)˜µ + C(µµ;µ_)µ_ + g(µ)= ¿r ¡ ¿ f(µ_) (1) where µ 2 Rn is the vector of joint positions, D(µ) is the n £ n matrix of manipulator inertia, C(µµ; µ_)µ_ 2 Rn is the vector of centrifugal and Coriolis torques, g(µ) 2. profile tracking response of robot manipulator at (a) J1 axis (b) J2 axis (c) J3 axis (d) J4 axis (e) J5 axis Robot Manipulators 0 0 X - a x i s. (degree) of link 1.

D(qr) is an N x N inertia matrix, H(qr, q') is an N x 1 Coriolis and centrifugal torque vector, G(qr) is an N x 1 gravitational loading vector, and N is the number of links. z = D(qr)ii' + H(qr, q') + G(qr) Once the coordinate systems for each link are established, the joint transformation matrix (i-l)dDiand the link transformation matrix iLid. A new method to control single-link lightweight flexible manipulators in the presence of changes in the load is proposed in this paper. The overall control scheme consists of three nested control loops. Once the friction and other nonlinear effects have been compensated, the inner loop is designed to give a fast motor response.

where θ, θ˙ and θ¨ are the joint angle, the joint angular velocity and the joint angle acceleration, respectively, M(θ)∈ Rn×n is the symmetric positive deﬁnite inertia matrix, C(θ,θ)˙ ∈Rn is the vector of Coriolis and centrifugal torques, τf(θ)˙ ∈Rn is the vector of actuator joint friction . Lagrangian of the robotic manipulator Total kinetic energy Total potential energy Torque or force applied on the joint. Joint variable Mass concentrated at the center of link Linear velocity at the center of mass of link Angular velocity at the center of mass of link Inertia tensor matrix at the center of mass of link.

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To overcome the joint friction, a novel method is introduced in which a linear feed-forward torque is designed using the principle of work and energy. Finally, the experimental set-up of a single rigid-link flexible-joint manipulator in the Robotics Laboratory at the University of Saskatchewan is used to verify the proposed by: 9.

Joint friction is a major problem in accurate robot position control, particularly during low-speed, small-amplitude tasks. This paper proposes a simple, practical, and effective method to compensate for joint friction, using a six-axis force/torque sensor mounted under the by: The proposed scheme when applied to multi-link robotic manipulators with joint flexibility guarantees a robust performance even if the Coriolis, centrifugal, joint flexibility and friction terms.

actuator forces which cause the manipulator to move along a given tra-jectory. If we have a perfect model of the dynamics of the manipulator, we can ﬁnd the proper joint torques directly from this model. In practice, we must design a feedback control law which updates the applied forces in response to deviations from the desired Size: KB.

motor side of the joint gearbox, M(’a) is the inertia matrix, C(’a;’_a) relates to speed dependent terms (e.g. Coriolis and centrifugal), ˝g(’a) are the gravity-induced torques and ˝f contain the joint friction components. The system is controlled through the input torque, u, applied to the joint.

The response of a one-link flexible arm while considering the effect of joint inertia has been investigated. Based on the results, computed torque law would perform equally well with composite control for flexible manipulators as long as the joint inertias are negligible.

The friction compensation method based on a nonlinear friction model is developed for a 2-DOF planar parallel manipulator. This nonlinear friction model enables reconstruction of viscous, Coulomb. In this paper, we introduce an adaptive type-2 fuzzy logic controller (FLC) for flexible-joint manipulators with structured and unstructured dynamical uncertainties.

Simplified interval fuzzy sets are used for real-time efficiency, and internal stability is enhanced by adopting a trade-off strategy between the manipulator’s and the actuators’ velocities. Furthermore, the control scheme is. Increasing requirements for the safety of human-robot interaction and the cost-effectiveness of collision detection rapidly promote the development of collision detection technology without torque sensors.

To address nonlinear disturbance factors in collision detection that may cause unstable or even incorrect detection, this paper proposed a research strategy that considered the friction as. An algorithm is presented for computing non-causal inverse dynamics for nonlinear noncollocated systems with non-zero initial conditions.

A noncollocated system has a controlled degree of freedom not collocated with an actuator. Inverse dynamics is the process of computing actuator inputs to obtain desired responses at the controlled degrees of freedom. RRR planar and articulated robot manipulators are de-rived using Lagrange-Euler method.

The links of mani-pulators are assumed rigid thin rods with gravity load-ing. The Lagrange-Euler formulation fordynamicsofro-bot manipulator with viscous friction is given as: (1) where i (t) is the joint torque vector;M ij is the symmet-ric inertia matrix; h.

The precise control of manipulators with high joint-friction using base force/torque sensingq Guillaume Morel1, including joint posi-tion, load, temperature, and wear (Armstrong, ). corresponds to the gravity wrench at joint i.

It is the summation of the link gravitational e!ects for all the. This paper concerns the problem of dynamical identification for an industrial robot manipulator and presents an identification procedure based on an improved cuckoo search algorithm. Firstly, a dynamical model of a 6-DOF industrial serial robot has been derived.

And a nonlinear friction model is added to describe the friction characteristic at motion reversal. This equation can be described the behavior of a robot manipulator link-by-link and joint-by-joint from base to endeffector, called forward recursion and transfer the essential information from end-effector to base frame, called backward recursive.

The literature on Euler-Lagrange’s is vast but a good starting point to learn about it is in. A clutch is a mechanical device which engages and disengages power transmission especially from driving shaft to driven shaft. In the simplest application, clutches connect and disconnect two rotating shafts (drive shafts or line shafts).In these devices, one shaft is typically attached to an engine or other power unit (the driving member) while the other shaft (the driven member) provides.

3 Variable Structure Control of Robot Joint For the development of the decentralized control scheme it is convenient to view each joint as a subsystem of the entire manipulator system, with these subsystems interconnected by “coupling torques” representing the inertial coupling terms and the Coriolis, centrifugal, friction and gravity terms.

The two-link robot manipulator generally has two revolute joints and prismatic joint. The schematic diagram of the two-link manipulator is shown in Fig The robots transport a load horizontally by actuating the two revolute joints.

The robots transport a load vertically by actuating the prismatic joint. =centrifugal and coriolis acceleration forces. Since both joint are revolute, the generalized torques and represent the actual join torques and the following equation represents EOM of the Two-link planar manipulator.

Considering the complex dynamic modeling of multi-DOF planar flexible manipulators, a general-purpose method for the rigid-flexible coupling dynamic modeling of N -DOF flexible manipulators is proposed in this paper, and symbolic calculation software is developed.

The modeling method is based on the Lagrange equation and assumed mode method (AMM). effects (friction) in the control design for a multi-dof articulated robot, the dynamics of each link is subject also to forces/torques due to motion couplings with other links (inertial, centrifugal) its own motion simultaneous with that of other links (Coriolis) static loads (gravity, contact forces).

Figure Robot Manipulator with Two Degrees of Freedom The dynamics of a simple manipulator is worked out to illustrate the Lagrange-Euler formulation and to clarify the problems involved in dynamic modeling.

For the manipulator links 1 and 2, joint variables are 1 and 2, link lengths are l 1 and l 2 and mass of links are m 1 and m 2 and r.The physical model and mathematical model of CNC worktable are presented, where the nonlinear factors such as clearance and friction are considered.

The primary resonance of computer numerical control worktable with clearance and friction under harmonic excitation is investigated.With independent joint control, the motor torque has got two components. It has a component due to the motor's inertia, and it has a component due to the motor's viscous friction.

So, one is a function of the motor inertia and the motor's acceleration, the motor's viscous friction and the motor's angular velocity.