Recently, design for additive manufacturing has been proposed to maximize product performance through the rational and integrated design of the product, its materials, and their manufacturing processes. Searching desi...
详细信息
Recently, design for additive manufacturing has been proposed to maximize product performance through the rational and integrated design of the product, its materials, and their manufacturing processes. Searching design solutions in such a multidimensional design space is a challenging task. Notably, no existing design support method is both rapid and tailored to the design process. In this study, we propose a holistic approach that applies data-driven methods in design search and optimization at successive stages of a design process. More specifically, a two-step surrogate model-based design method is proposed for the embodiment and detailed design stages. The Bayesian network classifier is used as the reasoning framework to explore the design space in the embodiment design stage, while the Gaussian process regression model is used as the evaluation function for an optimization method to exploit the design space in detailed design. These models are constructed based on one dataset that is created by the Latin hypercube sampling method and then refined by the Markov Chain Monte Carlo sampling method. This cost-effective data-driven approach is demonstrated in the design of a customized ankle brace that has a tunable mechanical performance by using a highly stretchable design concept with tailored stiffnesses.
This paper proposes a new method for measuring thickness data of surface compensation gasket and an algorithm for ellipse fitting and multiple ellipse fitting. First of all, the laser ranging sensor is used to scan th...
详细信息
This paper proposes a new method for measuring thickness data of surface compensation gasket and an algorithm for ellipse fitting and multiple ellipse fitting. First of all, the laser ranging sensor is used to scan the surface to obtain the data types of different specifications and to analyze the advantages and disadvantages of the data types. Secondly, the least square method is used to fit the data and analyze algorithm error. Finally, a new multi-ellipse fitting algorithm is proposed for determining the position of the fastening hole. It will facilitate the application of force sensors.
In recent years, the Robot Operating system (ROS) is developing rapidly and has been widely used in robotics research because of its flexible, open source, and easy-to-expand advantages. In scientific research, the co...
详细信息
Standing wave acoustic levitation and transmission technique has been widely used in many research areas. However, the vibration of particles in an acoustic field restricts their applications. In this work, a kind of ...
Standing wave acoustic levitation and transmission technique has been widely used in many research areas. However, the vibration of particles in an acoustic field restricts their applications. In this work, a kind of mechanism is developed by the authors, in which not only a harmonic linear actuator but also position feedback are used to precisely adjust the distance between the radiator and the reflector with micrometric accuracy. And video computing software is applied to track the motion of the particle. The influence of the factors on the frequencies of the particle both in vertical and horizontal were detailed. Besides, the acceleration field was calculated, which is in good agreement with the model of spring oscillator of an acoustic field.
Vibration characteristics of planetary rovers may contain features that can be effectively used for terrain classification, terrain properties estimation, and terrain traversability assessment. However, the convention...
详细信息
ISBN:
(纸本)9781728103785;9781728103778
Vibration characteristics of planetary rovers may contain features that can be effectively used for terrain classification, terrain properties estimation, and terrain traversability assessment. However, the conventional vibration features selected to represent the terrain induced wheel response vary with the wheel speed, which could cause misclassification. In order to extract speed-independent vibration features of wheels, this paper proposes vibration model of wheels traversing different types of terrains with consideration of the dynamics of lug-terrain interaction. Based on the proposed model, low-dimensional vibration features including frequency, amplitude, mean value, and mean square value are extracted from statistical features of vibration acceleration. Nondimensionalization is performed to make them independent on wheel speed. The features can represent the terrain characteristics decoupled from the wheel speed so that they can be used to reduce terrain misclassification in the future. Experimental results show that the vibration features extracted are independent on wheel speed and effective for terrain classification.
We present a novel algorithm for collision-free kinematics of multiple manipulators in a shared workspace with moving obstacles. Our optimization-based approach simultaneously handles collision-free constraints based ...
详细信息
A six-phase permanent magnet synchronous machine (PMSM) with a new fractional-slot winding arrangement is proposed for the electric vehicle application. With a 105° electrical angle between the two sets of three-...
详细信息
In this work, in order to improve spatial recognition abilities for the long-term operation tasks of the assistant robot for the elderly, a novel approach of semantic region estimation is proposed. We define a novel g...
详细信息
In this work, in order to improve spatial recognition abilities for the long-term operation tasks of the assistant robot for the elderly, a novel approach of semantic region estimation is proposed. We define a novel graphbased semantic region descriptions, which are estimated in a dynamically fashion. We propose a two-level update algorithm, namely, Symbols update level and Regions update level. The algorithm firstly adopts particle filter to update weights of the symbols, and then use the Viterbi algorithm to estimate the region the robot stays in based on those weights, optimally. Experimental results demonstrate that our proposed approach can solve problems of the long-term operation and kidnapped robot problem.
暂无评论