Abstract

Successful aerial manipulation largely depends on
how effectively a controller can tackle the coupling dynamic
forces between the aerial vehicle and the manipulator. However,
this control problem has remained largely unsolved as the existing
control approaches either require precise knowledge of the
aerial vehicle/manipulator inertial couplings, or neglect the statedependent uncertainties especially arising during the interaction
phase. This work proposes an adaptive control solution to
overcome this long standing control challenge without any a
priori knowledge of the coupling dynamic terms. Additionally, in
contrast to the existing adaptive control solutions, the proposed
control framework is modular, that is, it allows independent
tuning of the adaptive gains for the vehicle position sub-dynamics,
the vehicle attitude sub-dynamics, and the manipulator subdynamics. Stability of the closed loop under the proposed scheme
is derived analytically, and real-time experiments validate the
effectiveness of the proposed scheme over the state-of-the-art
approaches.

Abstract

An embodiment herein provides a re-configurable
unmanned aerial vehicle that re-configures its shape based
on the shape, size, weight of a payload, and efficiently
performs payload delivery in real-time. The re-configurable
unmanned aerial vehicle includes one or more rotor units
placed at corners and is connected by one or more scissor
units. The re-configurable unmanned aerial vehicle
approaches the payload in a first location, and analyses the
position and dimension of the payload with a camera, that
enables the one or more scissor units to adjust its length by
at least one elongation or compression following size and
shape of the payload and fit the payload within the re-
configurable unmanned aerial vehicle. The re-configurable
unmanned aerial vehicle takes off carrying the payload from
the first location and lands at a second location.

Abstract

Grasping using an aerial robot can have many applications ranging from infrastructure inspection and maintenance
to precise agriculture. However, aerial grasping is a challenging
problem since the robot has to maintain an accurate position
and orientation relative to the grasping object, while negotiating
various forms of uncertainties (e.g., contact force from the object).
To address such challenges, in this paper, we integrate a novel
passive gripper design and advanced adaptive control methods
to enable robust aerial grasping. The gripper is enabled by
a pre-stressed band with two stable states (a flat shape and
a curled shape). In this case, it can automatically initiate the
grasping process upon contact with an object. The gripper also
features a cable-driven system by a single DC motor to open
the gripper without using cumbersome pneumatics. Since the
gripper is passively triggered and initially has a straight shape,
it can function without precisely aligning the gripper with the
object (within an 80 mm tolerance). Our adaptive control scheme
eliminates the need for any a priori knowledge (nominal or
upper bounds) of uncertainties. The closed-loop stability of the
system is analyzed via Lyapunov-based method. Combining the
gripper and the adaptive control, we conduct comparative realtime experimental results to demonstrate the effectiveness of
the proposed integrated system for grasping. Our integrated
approach can pave the way to enhance aerial grasping for
different applications.

Abstract

Stable aerial manipulation during dynamic tasks such as object catching, perching, or contact with rigid surfaces necessarily requires compliant behavior, which is often achieved via impedance control. Successful manipulation depends on how effectively the impedance control can tackle the unavoidable coupling forces between the aerial vehicle and the manipulator. However, the existing impedance controllers for aerial manipulator either ignore these coupling forces (in partitioned system compliance methods) or require their precise knowledge (in complete system compliance methods). Unfortunately, such forces are very difficult to model, if at all possible. To solve this long-standing control challenge, we introduce an impedance controller for aerial manipulator which does not rely on a priori knowledge of the system dynamics and of the coupling forces. The impedance control design can address unknown coupling forces, along with system parametric uncertainties, via suitably designed adaptive laws. The closed-loop system stability is proved analytically and experimental results with a payload-catching scenario demonstrate significant improvements in overall stability and tracking over the state-of-the-art impedance controllers using either partitioned or complete system compliance.

Abstract

No Results Found

Abstract

This work proposes a resource efficient robust control scheme for missile-target engagement scenarios subjected to external disturbances. The robustness is achieved by using an annular event-triggered artificial time-delayed control (ET-TDC) methodology with input saturation. The ET-TDC philosophy uses the TDC strategy through a dynamic predefined triggering mechanism which overcomes the requirement to update the control periodically for every sampling instant, unlike conventional TDC and other robust control schemes. Thus the proposed methodology can tackle uncertainties with minimal a-priori knowledge while significantly reducing the over-utilisation of system resources. In addition, the adopted event-triggered mechanism facilitates further conservation of energy which might be crucial for mid-to-long range engagement scenarios. The closed-loop stability is derived analytically and the simulation results illustrate the efficacy of the proposed guidance framework in comparison with other state-of-art robust control methodologies.

Abstract

Transportation of a suspended payload using quadrotor demands a controller to simultaneously track the desired path and stabilize the planar payload swing angles. Such a control objective is made challenging by the need to orchestrate the coupling between fully actuated dynamics (quadrotor attitude) and underactuated dynamics (quadrotor position and planar payload swings). State-of-the-art controllers cannot orchestrate such coupled dynamics in the presence of unmodeled and state-dependent terms, such as aerodynamic drags and rotor downwash. This article solves this control challenge by adaptively estimating the state-dependent uncertainty. Closed-loop stability for the coupled underactuated and fully actuated dynamics is established analytically. Extensive real-time experiments confirm significant improvements over the state-of-the-art under various scenarios, such as path tracking with suspended payload and anti-swing control against externally induced payload swings.

Abstract

In this article, we propose a new practical synchronization protocol for multiple Euler-Lagrange systems without structural linear-in-the-parameters (LIP) knowledge of the uncertainty and where the agents can be interconnected before control design by unknown state-dependent interconnection terms. This setting is meant to overcome two standard a priori assumptions in the literature concerning uncertainty with LIP structure and absence of interaction among agents before designing the synchronization protocol. To overcome these assumptions, we propose an adaptive distributed control mechanism having the purpose of estimating the coefficients of the resulting state-dependent uncertainty structure.

Abstract

This article proposes a framework for adaptive synchronization of uncertain underactuated Euler-Lagrange (EL) agents. The designed distributed controller can handle both state-dependent uncertain system dynamics terms and state-dependent uncertain interconnection terms among neighboring agents. No structural knowledge of such terms is required other than the standard properties of EL systems (positive definite mass matrix, bounded gravity, velocity-dependent friction bound, etc.). The study of stability relies on a suitable analysis of the nonactuated and the actuated synchronization errors, resulting in stable error dynamics perturbed by parametrized state-dependent uncertainty. This uncertainty is tackled via appropriate adaptation laws, giving stability in the uniform ultimate boundedness sense, in line with available literature on state-dependent uncertain system dynamics and/or state-dependent uncertain interconnections. An example with a network of boom cranes is used to validate the proposed approach.

Abstract

This paper examines the enhancement of
quadrotor efficiency through adaptive control to address
the critical need for Fault-Tolerant Control (FTC) in
quadrotors amidst operational uncertainties and component inefficiency. State-of-the-art adaptive FTC strategies
often assume the uncertainties to be bounded by a constant
a priori; however, imprecise knowledge of inertial system
parameters lead to state-dependent uncertainties which
do not follow such assumption. Remain unattended, statedependent uncertainties can lead to instability, especially
under actuator faults. The proposed adaptive FTC offers
actuator fault mitigation while tackling unknown (statedependent) uncertainties via suitably designed adaptive
laws. Additionally, real-time fault detection and control
allocation are used simultaneously to avoid conservative
control application. The closed-loop system stability is
studied analytically and the effectiveness of the proposed
solution is verified on a realistic simulator in comparison
to the state of the art.