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In this work a gradient calibration method was presented as part of the Relative-Change-Based-Hierarchical Taxonomy (RCBHT) cantilever-snap verification system and the Pivot Approach control strategy for the automation of cantilever-snaps. As part of a relative-change based force signal interpretation scheme, an effective gradient calibration process is needed to increase the RCBHT's system robustness...
Autonomous snap assemblies is a highly desirable robotic functionality. While much work has been done in active sensing for peg-in-hole assemblies and general compliant motions, snap assembly state estimation remains an open research problem. This work presents a probabilistic framework designed to account for uncertainties in assembly and yield more intuitive and robust outcome assessments. Simulation...
Snap assembly automation remains a challenging task. While progress is being made in localization of parts, force controllers, and control strategies, little work has been done to help the robot reason about its current state, such that if necessary, the robot can assume corrective actions to accomplish the task. Error prone situations caused by the unexpected motion of parts, localization errors,...
This paper proposes an object placement planner for a grasped object during pick-and-place tasks. The proposed planner automatically determines the pose of an object stably placed near a user assigned point on an environment surface. The proposed method first constructs a polygon model of the surrounding environment, and then clusters the polygon model of both the environment and the object where...
Industrial snap assembly processes remain largely a manual task. Much of the research in snap assembly has not sought to design strategies and controllers according to the class of snap-fastener used. Three fastener types are used in manufacturing: cantilever, torsional, and annular snaps. As a first step in solving the snap automation problem, sought to devise a force control strategy that could...
This paper addresses the use of a service robot system working for humans in a daily life environment. The robot system described here always interacts with humans, and is therefore required to consider the satisfaction of users to provide suitable services. Our goal is to develop a robot system offering a hand-over service according to the preference of users. Here, we construct a task instruction...
This paper presents the development of Robot Technology Components (RTCs) using RT-Middleware (RTM) for designing assistive robotic arms and human-machine interfaces (HMIs) that can be used by the disabled. RTM is an open software platform for a component-oriented robot system. An RTC is the basic functional unit for constructing a robot system using RTM. The interface definition for the basic functionality...
A grasping and manipulation with a multi-fingered hand is comprised of one or more functional finger actions. We define a functional finger action as a ??primitive action,?? and fingers that are used in separate primitive actions in a grasping and manipulation as ??functional finger isolation.?? Various grasping and manipulations can be realized by assigning different primitive actions to the functional...
To support disabled persons with less muscle strength like muscular dystrophy patients, a single switch and a scanning menu panel is introduced to input method for the manipulator control. The iArm manipulator and its simulator are connected to evaluate the input performance. The evaluation task is the handling of pegs on the pegboard with the manipulator. Muscle dystrophy patients tested our interface...
To support disabled people with less muscle strength like muscular dystrophy patients, we are developing simple robot arm systems. In this paper, we report the improvements of the inter-face part of the system. The user can change the buttons' position on the input panel only with the single switch. The user can let the buttons on the input panel scan with single click and can select a button with...
In this paper, assembly skills for dry battery insertion are analyzed with respect to the applied force control. First, force control parameters used in dry battery insertion are identified based on human demonstration data. The time series data of force control parameters are then modeled based on a hidden Markov model (HMM). By analyzing the obtained HMM, basic motions necessary for achieving the...
We are developing a manipulator system in order to support disabled people with less muscle strength such as muscular dystrophy patients. Such a manipulator should have an easy interface for the users to control it. In this paper, we report on the construction of the user interface of the system using RT-middleware. RT-middleware is an open software platform for robot systems. Therefore other interface...
We propose a method for generating robot motions by integrating multiple policies effective for task achievement. The method obtains a new policy efficiently based on the applied policies. However, there might be some states in which the applied policies fail to achieve the task. The failing states are found by means of a decrease in the state values. The policies for the states are then modified...
Parameter tuning of force control to achieve operations efficiently in robotic assembly is essential but time-consuming. In this paper, an optimal set of parameters for damping control is computed, which can reduce the cycle time of an assembly operation. The proposed method is formulated as a nonlinear optimization using a dynamic simulator based on 3D geometric model of assembled parts. The method...
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