Nanomachines such as nanorobots working either in vacuum or in a fluid as mobile machines themselves become the size of the order of the Brownian particle, a nanoparticle free floating in the fluid. For nanomachines w...
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Nanomachines such as nanorobots working either in vacuum or in a fluid as mobile machines themselves become the size of the order of the Brownian particle, a nanoparticle free floating in the fluid. For nanomachines working in fluids, the thermal agitation around the machine influences its movement to a greater degree. The nanomachine itself is modeled as a sphere of radius r and proof mass m, which is thermally agitated by fluid particles in a time continuum. The thermal impact equals white noise. A model of the nanoparticle, considering it as an elastic body instead of assuming it as rigid, has been developed by considering the impact process in different ways. The stochastic motion indexes, mean, and variances, were obtained for different models using a correlation technique, with a validity constraint that variance cannot be negative. A probable model has been found that survived universally the constraint test accounting for the Brownian and non-Brownian motion, simultaneously. The model predictions have been verified and were found in good agreement with published experimental results.
This paper proposes the system for ship outfitting support based on the augmented reality. Considering the practical applicability of the elaborated procedure as the highest priority, the intention was to develop a su...
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In fault detection and diagnostics, limitations coming from the sensor network architecture are one of the main challenges in evaluating a system's health status. Usually the design of the sensor network architect...
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ISBN:
(纸本)9780889867741
In fault detection and diagnostics, limitations coming from the sensor network architecture are one of the main challenges in evaluating a system's health status. Usually the design of the sensor network architecture is not solely based on diagnostic purposes, other factors like controls, financial constraints, and practical limitations are also involved. As a result, it quite common to have one sensor (or one set of sensors) monitoring the behaviour of two or more components. This can significantly extend the complexity of diagnostic problems. In this paper a systematic approach is presented to deal with such complexities. It is shown how the problem can be formulated as a Bayesian network based diagnostic mech.nism with latent variables. The developed approach is also applied to the problem of fault diagnosis in HVAC systems, an application area with considerable modeling and measurement constraints.
The topic of fault detection and diagnostics (FDD) is studied from the perspective of proactive testing. Unlike most research focus in the diagnosis area in which system outputs are analyzed for diagnosis purposes, in...
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ISBN:
(纸本)9780889867741
The topic of fault detection and diagnostics (FDD) is studied from the perspective of proactive testing. Unlike most research focus in the diagnosis area in which system outputs are analyzed for diagnosis purposes, in this paper the focus is on the other side of the problem: manipulating system inputs for better diagnosis reasoning. In other words, the question of how diagnostic mech.nisms can direct system inputs for better diagnosis analysis is addressed here. It is shown how the problem can be formulated as decision making problem coupled with a Bayesian Network based diagnostic mech.nism. The developed mech.nism is applied to the problem of supervised testing in HVAC systems.
This paper describes the aims, methodology and results of an empirical research project. The aim was to gather new insight about how collaborative decision-making processes in the conceptual engineering design phase o...
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This paper describes the aims, methodology and results of an empirical research project. The aim was to gather new insight about how collaborative decision-making processes in the conceptual engineering design phase of the product development process takes place. The insight contributes to bridging the gap between the theoretical development of new decision-making methods in academia and the needs of practitioners. The researchers observed, recorded and transcribed three workshops involving groups that were engaged in the collaborative decision-making processes. Through analysing the transcripts, a set of decision-making related activities was identified. Each activity's time consumption was quantified, and a number of decision-making process models at different levels of detail were developed. During this analysis, various observations on particular process characteristics were made. It was observed that generating formal structures and documentation was beneficial to the decision-making process. This was particularly true with respect to developing problem understanding and consistency. The outcomes should be valuable for the design and development of improved decision-support systems.
This article discusses the complexities of real-world planning and how to create planning systems to address them. IMACS, an automated designer's aid, evaluates machined parts and suggests design modifications to ...
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This article discusses the complexities of real-world planning and how to create planning systems to address them. IMACS, an automated designer's aid, evaluates machined parts and suggests design modifications to improve their manufacturability, offering advantages over planning techniques used in classical planning systems. IEEE intelligent systems.
The Prosthesis-User-in-the-Loop simulator concept represents an approach to integrate users to prosthetic development by a holistic simulation of gait with a prosthesis. It aims at a more user-centered design of lower...
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ISBN:
(纸本)9781479906505
The Prosthesis-User-in-the-Loop simulator concept represents an approach to integrate users to prosthetic development by a holistic simulation of gait with a prosthesis. It aims at a more user-centered design of lower limb prosthetic devices by utilizing user experience and assessment. As this requires a complex mech.nical robot design and sophisticated control strategies that allow for restoring lost biomech.nical function, this paper presents the conception and design of a hardware simulator for proof-of-concept studies of those issues. For those investigations, the ankle joints of healthy praticpants are locked mech.nically to induce a temporary disability. The task of the simulator is to provide a simulation of physiological gait by artificially restoring ankle functionality. Therefore, the biody-namic behaviour of the locked ankle joint and the enviroment have to be mimicked mech.ically. After introducing Prosthesis-User-in-the-Loop simulator idea, the conception of a proof-of-concept simulator is presented. From this, an analytical model is derived and inverse dynamics simulation are used for design. The resulting mech.nism is limited to sagittal plane movements and thus has three degrees of freedom. The actuators are dimensioned to meet the requirements of walking motions in the human subject with maximum body height among the test population.
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