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In this paper, supply chain nodes are considered, with the aim of optimizing the production of parts belonging to different classes (the case of two classes is here taken into account). The production node is modelled by a discrete-event model, being the system state, consisting of the continuous level of input and output inventories, affected by the asynchronous processes relevant to part arrivals...
The foundry business model was first developed by TSMC in 1985. A foundry should provide customers with IC manufacturing services. Those customers include IC design houses, integrated device manufacturers (IDM), and system suppliers. However, most electronic products are consumer products, and their life cycle has been reducing with time. An IC design house needs to continuously develop ICs with new...
In this paper, an adaptive control structure based on the well-known four-channel (4C) control architecture is proposed to achieve transparency in non-ideal (high friction) teleoperation devices. The choice of the parameters to be adapted is motivated using a modified version of the 4C model. Next, two experiments are proposed to define the boundaries of the parameters values to be tuned during the...
This paper introduces a signal-recognition based approach for detecting autonomous mobile robot immobilization on outdoor terrain. The technique utilizes a support vector machine classifier to form class boundaries in a feature space composed of statistics related to inertial and (optional) wheel speed measurements. The proposed algorithm is validated using experimental data collected with an autonomous...
Crawler mechanisms have the advantage of stable navigation on uneven terrain; as a result, such mechanisms have been adopted for many types of locomotion of outdoor robots, including "search and rescue robots". However, crawler mechanisms always slip when tracking curved paths, and it generates a large accumulating positioning error in vehicles as opposed to conventional wheeled mobile robots...
This paper and video present the components and flight tests of an indoor, multi-vehicle testbed that was developed to study long duration UAV missions in a controlled environment. This testbed is designed to use real hardware to examine research questions related to single- and multi-vehicle health management, such as vehicle failures, refueling, and maintenance. The testbed has both aerial and ground...
Outside of the laboratory, accurate models of ground impact dynamics are either difficult or impossible to obtain. Instead, a rigid ground model is often used in gait and controller design, which simplifies the system model and allows attention to remain focused on other aspects of running. In real-world terrain this simplification may overlook important dynamic effects. Immediately following a foot...
In this paper, we present a vision-based terrain mapping and analysis system, and a model predictive control (MPC)-based flight control system, for autonomous landing of a helicopter-based unmanned aerial vehicle (UAV) in unknown terrain. The vision system is centered around Geyer et al.'s recursive multi-frame planar parallax algorithm (2006), which accurately estimates 3D structure using geo-referenced...
Cable-based parallel manipulators (CPM) are light-weight manipulators that can reach high accelerations. The difference between the design of CPM and that of rigid-link parallel manipulators is that cables can only perform while under tension. Redundant limbs, such as extra cables, springs, or cylinders, can be used for applying forces on the mobile platform to generate cable tensions resulting in...
Prediction of dynamic features is an important task for determining the manipulation strategies of an object. This paper presents a technique for predicting dynamics of objects relative to the robot's motion from visual images. During the learning phase, the authors use recurrent neural network with parametric bias (RNNPB) to self-organize the dynamics of objects manipulated by the robot into the...
An indirect iterative learning algorithm has shown to be able to update the parameters of an acceleration feedback controller for flexible manipulators. The fine estimation of the masses of a chain of mass-spring-dampers units allows the simultaneous tuning of both the feedback controller and the trajectory generation. This algorithm has been validated on an industrial robot arm.
In this work, the relative pose problem is addressed in our structured light system. Assuming that there is an arbitrary planar structure in the scene, we suggest a method for estimating the rotation matrix and translation vector between the camera and the projector. In this system, the varying focal lengths of the camera are allowed and can be obtained without any further assumptions. Finally, we...
Fast detection of objects in a home or office environment is relevant for robotic service and assistance applications. In this work we present the automatic localization of a wide variety of differently shaped objects scanned with a laser range sensor from one view in a cluttered setting. The daily-life objects are modeled using approximated superquadrics, which can be obtained from showing the object...
In this paper a study is conducted on the force capabilities of centripetal force actuated microrobotic platforms. The aim is to exploit the centripetal forces generated by platform mounted vibrating micro-motors for micromanipulation purposes. First, an overview of the platform dynamics and motion capabilities is presented. The type of forces generated by the actuation mechanism as well as due to...
Scene registration of 3D laser rangefinder scans is increasingly being required in applications, such as mobile robotics, that demand a timely response. For speeding up point matching methods, the large amount of range data should be reduced. This sampling, in turn, can have a significant impact on accuracy. In particular, genetic algorithms provide a robust optimization method that avoids local minima...
In this paper, we consider the problem where a point robot in a 2D or 3D environment equipped with an omnidirectional range sensor of finite range D is asked to inspect a set of surface patches, while minimizing the sum of view cost, proportional to the number of viewpoints planned, and the travel cost, proportional to the length of path traveled. We call it the metric view planning problem with traveling...
This paper presents a development of multi-fingered hand, which is modularized and can be attached to life-size humanoid robots. The developed hand has four fingers with 17 joints, which consist of 13 active joints and 4 linked joints. A miniaturized 6-axes force sensor is newly developed and is mounted on each fingertip for improving the manipulability. A main node controller with I/O, motor drivers,...
We describe the design and control of a new bio-inspired climbing robot designed to scale smooth vertical surfaces using directional adhesive materials. The robot, called Stickybot, draws its inspiration from geckos and other climbing lizards and employs similar compliance and force control strategies to climb smooth vertical surfaces including glass, tile and plastic panels. Foremost among the design...
This paper proposes a generalized version of control strategy that enables state synchronization among distributed subsystems without altering the natural dynamics that each separate system is supposed to show. To handle the general case of N-subsystem with heterogeneous dynamics, a method of dynamic scaling and ring type network topology are proposed. The associated stability bound is analyzed. We...
A propulsion system similar in size and motion to the helical bacterial flagella motor is presented. The system consists of a magnetic nanocoil as a propeller (27 nm thick ribbon, 3 mun in diameter, 30-40 mum long) driven by an arrangement of macro coils. The macro coils generate a rotating field that induces rotational motion in the nanocoil. Viscous forces during rotation result in a net axial propulsion...
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