this paper proposes a block backstepping trajectories tracking control scheme for a class of unmanned helicopters. the control objective is to make the position and yaw angle trajectories of the helicopter track the d...
详细信息
ISBN:
(纸本)9781538695821
this paper proposes a block backstepping trajectories tracking control scheme for a class of unmanned helicopters. the control objective is to make the position and yaw angle trajectories of the helicopter track the desired position and yaw angle trajectories. In order to design the controller, the helicopter system is divided into three subsystems at first. then based on the block backstepping technique, four control inputs which constitute the helicopter controller are designed step by step in three subsystems. the asymptotic stability of the closed-loop helicopter trajectories tracking error system is verified based on Lyapunov stability analysis. Finally, numerical simulations demonstrate the effectiveness of the proposed block backstepping control scheme.
We develop a hardware and software for EtherCAT slave based on multi-core DSP in order to apply to control applications. Beckhoff's ET1100 ASIC is employed as EtherCAT slave controller;EtherCAT slave stack and con...
详细信息
ISBN:
(纸本)9781538695821
We develop a hardware and software for EtherCAT slave based on multi-core DSP in order to apply to control applications. Beckhoff's ET1100 ASIC is employed as EtherCAT slave controller;EtherCAT slave stack and control application algorithm are processed by individually assigned DSP core;and data interexchange between the two DSP cores is carried out by using the Inter-Process Communication mechanism. Namely, we intentionally separate the EtherCAT communication stack process from control application process using multi-core DSP, which enables to achieve conducting complicated control application as well as high-speed communication cycle. the high performance of the developed EtherCAT slave are demonstrated by real experiments using EtherCAT network composed of the developed slave and IgH EtherCAT master for Linux.
this paper presents a vision-based approach to prevent dangerous steering situations when riding a motorcycle in turns. the proposed algorithm is capable of detecting under, neutral or over-steering behavior using onl...
详细信息
ISBN:
(纸本)9781538695821
this paper presents a vision-based approach to prevent dangerous steering situations when riding a motorcycle in turns. the proposed algorithm is capable of detecting under, neutral or over-steering behavior using only a conventional camera and an inertial measurement unit. the inverse perspective mapping technique is used to reconstruct a bird-eye-view of the road image. then, filters are applied to keep only the road markers which are, afterwards, approximated withthe well-known clothoid model. this allows the prediction of the road geometry such as the curvature ahead of the motorcycle. Finally, from the predicted road curvature, the measurements of the Euler angles and the vehicle speed, the proposed algorithm is able to characterize the steering behavior. To that end, we propose to estimate the steering ratio and we introduce new pertinent indicators such as the vehicle relative position dynamics to the road. the method is validated using the advanced simulator BikeSim during a steady turn.
this paper describes the outcomes of a framework for aircraft door position identification with visual camera using common features that can be found in all commercial airplanes, which guides the aerobridge to automat...
详细信息
ISBN:
(纸本)9781538695821
this paper describes the outcomes of a framework for aircraft door position identification with visual camera using common features that can be found in all commercial airplanes, which guides the aerobridge to automatically and reliably dock (Precision of 0.5cm), with minimal human intervention. the system has to work day and night, rain or shine under all-weather conditions. the proposed solution consists of a suite of relevant extracted and identified features that characterize aircraft door (e.g. door windows, handle, text, footplate, arrow, frame lines). Furthermore, the work focuses on a final door position confirmation accomplished by the logical structure for the decision process for the identification of the aircraft door using the various features. In that way we are able to build confidence level with appropriate structural (logical component connection) organization. thus, the aircraft door frame can be accurately identified with a very small error (in the range of a couple of cm) and eliminate risk of injuring the personnel or damaging the airplane.
In this technical note, the event-based leader-following control is investigated for a multiple non-identical Euler-Lagrange system with a directed graph. An event-triggered observer is provided to estimate the state ...
详细信息
ISBN:
(纸本)9781538695821
In this technical note, the event-based leader-following control is investigated for a multiple non-identical Euler-Lagrange system with a directed graph. An event-triggered observer is provided to estimate the state of a dynamic leader. To avoid continuous interaction among agents, a broadcasting communication mechanism based on models is utilized. Combining withthe event-triggered observer, a distributed adaptive tracking control is presented for multiple lagrangian systems with uncertainties such that all nodes asymptotically follow a virtual leader governed by a linear model. Finally, a simulation with 2-degree-of-freedom manipulators is presented to verify the usefulness of our proposed methods.
We focus on the realization of the hierarchical inverse kinematics as a practical means of a hard real-time motion planning for a humanoid robot. To achieve complex on-line full body manipulation performance, a task p...
详细信息
ISBN:
(纸本)9788993215151
We focus on the realization of the hierarchical inverse kinematics as a practical means of a hard real-time motion planning for a humanoid robot. To achieve complex on-line full body manipulation performance, a task priority is established among the tasks to precisely resolve task conflicts and all algorithms are described in recursive equations so as to minimize computation time. Formulating the kinematic problem in a least-square optimization enables us to derive solutions in a unified and consistent framework. the performance is validated through numerical simulations with bearing mind of rescue robot applications and finally, the inverse kinematic solution is found within 0.3msee on average for 19 degrees of freedom control.
In the paper two types of nonlinear limit-cycles oscillations in flight control systems, caused by typical static nonlinearities of the control surfaces actuators that arise in the flight of aircraft are considered: t...
详细信息
ISBN:
(纸本)9781538695821
In the paper two types of nonlinear limit-cycles oscillations in flight control systems, caused by typical static nonlinearities of the control surfaces actuators that arise in the flight of aircraft are considered: the elastic-flexural flutter of the wing and pilot induced oscillations (PIO), where interactions of a flight controller with a human pilot's dynamics can cause the origin instability. Hidden oscillations in the pilot-aircraft closed loop are studied and localized by means of the iterative analytical-numerical method. A problem of adaptive flutter suppression is studied and an opportunity of emerging the hidden oscillations due to controlling surface saturation in rate and magnitude is demonstrated.
Facing fierce competition in mass customization, rapid response to dynamic changes is strategically important for manufactures to increase opportunity of survival in high-mix, low-volume (HMLV) environment. the tradit...
详细信息
ISBN:
(数字)9781728169040
ISBN:
(纸本)9781728169057
Facing fierce competition in mass customization, rapid response to dynamic changes is strategically important for manufactures to increase opportunity of survival in high-mix, low-volume (HMLV) environment. the traditional dedicated manufacturing system for mass production is required to become modular, scalable and reconfigurable for increasing flexibility and responsiveness to cope withthe changing market. Motivated by a hybrid assembly cell lines (HACL) in real-life, a distributed assembly cells system, inspired by swarm intelligence (SI) concept and swarm robotics, has been proposed, named swarm assembly system (SAS). In order to apply and reap the benefits of SI to SAS, three main components are designed by referring to swarm robot system and they are human-cyber-physical system holon (HCPS Holon), intelligent assembly workstation (iWorkstation) and operational framework of SAS. Computer vision technologies are employed to monitor and analyze real-time worker status and operation information within the iWorkstation for closed-loop adaptive control. the hybrid operational framework of SAS provides the basis for communication between iWrokstations and global decision making. Several scenarios are designed to show its potential benefits in robustness, reconfigurability and scalability, resulting in enhancing responsiveness in HMLV environment.
this paper presents a novel evaluation method of areas affected by natural disasters withthe purpose of managing these crisis situations. Since it is necessary to have a real overview of a specific area in the shorte...
详细信息
ISBN:
(纸本)9781538695821
this paper presents a novel evaluation method of areas affected by natural disasters withthe purpose of managing these crisis situations. Since it is necessary to have a real overview of a specific area in the shortest time, our methodology proposes a neural network with backpropagation approach for flood detection from UAV images. For this, the Local Binary Pattern (LBP) texture operator is used for areas classification. the LBP operator labels each pixel of the analyzed image by comparing it with its neighbors, which ends withthe computation of a binary number that it is converted to decimal format named LBP code. thus, based on the generated LBP codes, a histogram type feature is computed and used in both training and testing phases of the proposed neural network. Over 50 images obtained withthe aid of UAV technology were tested withthe proposed neural network and good results in terms of accuracy for flood areas detection were obtained.
Stabilization of the inverse model of the target system is a critical problem in a current disturbance observer (DOB) based control scheme. When the system is identified as a second order system by the recursive least...
详细信息
ISBN:
(纸本)9781538695821
Stabilization of the inverse model of the target system is a critical problem in a current disturbance observer (DOB) based control scheme. When the system is identified as a second order system by the recursive least square (RLS) algorithm, the minimum phase (MP) of the model is not guaranteed. this paper addresses a guaranteed minimum phase method of the identified second order model. Jury's test is conducted to check the stability. All-Pass-Filtering (APF) process are conducted for updating prior parameters of RLS to satisfy the minimum phase criteria. To verify the proposal, a single-wheel robot is identified as a second order model by the RLS method with guaranteed stability. Disturbance observer is designed based on the model. Balancing control experiments of a single-wheel robot are conducted.
暂无评论