In all mechanical devices, motors are subject to failures, which can sometimes lead to the shutting down of an entire industrial process. That is the reason why predictive maintenance and prognosis are necessary. Moto...
详细信息
In all mechanical devices, motors are subject to failures, which can sometimes lead to the shutting down of an entire industrial process. That is the reason why predictive maintenance and prognosis are necessary. Motor current signature analysis is a condition monitoring technique that is now widely used to diagnose problems such as broken rotor bars, abnormal levels of airgap eccentricity, shorted turns in low voltage stator windings and some mechanical problems. This paper presents the effect of the broken bar time evolution since the created incipient fault on the various characteristics of the induction machine such as torque, speed and currents. The methods used for analysis are based on: the Lissajous representation of Park vector current components spectral analysis of stator current and the modulus of Park vector current.
In this chapter we present SOSTOOLS, a third-party MATLAB toolbox for formulating and solving sum of squares optimization problems. Sum of squares optimization forms a basis for formulating convex relaxations to compu...
详细信息
In view of the impossibility of current measurement in actual grounding plane in power electronic equipment, an equivalent circuit model is set up in this paper using the partial element equivalent circuit (PEEC) meth...
详细信息
ISBN:
(纸本)7506274078
In view of the impossibility of current measurement in actual grounding plane in power electronic equipment, an equivalent circuit model is set up in this paper using the partial element equivalent circuit (PEEC) method to simulate and calculate current distribution in grounding plane. The inductance parameters calculated are fairly coincident with experiment results, and some conclusions of current distribution are summarized. It is shown that the equivalent circuit model using PEEC method presented in this paper is a feasible and promising way to model and calculate current distribution in grounding plane.
Assistive technology (AT) is becoming increasingly important in improving mobility, language and learning capabilities of persons who have disabilities enabling them to function independently and to improve their soci...
详细信息
In this work, we present implementation and experiment of the theory of dynamic force sensing for robotic manipulators, which uses a sensor fusion technique in order to extract the contact force exerted by the end-eff...
详细信息
In this work, we present implementation and experiment of the theory of dynamic force sensing for robotic manipulators, which uses a sensor fusion technique in order to extract the contact force exerted by the end-effector of the manipulator from those measured by a wrist force sensor, which are corrupted by the inertial forces on the end-effector. We propose a new control strategy based on multisensor fusion with three different sensors— that is, encoders mounted at each joint of the robot with six degrees of freedom, a wrist force sensor and an accelerometer— whose goal is to obtain a suitable contact force estimator for the three Cartesian axes. This new observer contributes to overcome many of the difficulties of uncertain world models and unknown environments, which limit the domain of application of currents robots used without external sensory feedback. An impedance control scheme was proposed to verify the improvement. The experiments were carried out on an ABB industrial robot with open controlsystem architecture.
In this paper, we deal with the issue of robust delay-independent asymptotic stability and robust disturbance attenuation problem for linear parameter-dependent systems. Using Hamiltonian-Jacoby-Isaac approach, a para...
详细信息
Nanocomposites have been attracted great attentions in recent years. However, most efforts are focused on the preparation and layer structure modification and very few mentioned about the properties of molded parts. I...
详细信息
Nanocomposites have been attracted great attentions in recent years. However, most efforts are focused on the preparation and layer structure modification and very few mentioned about the properties of molded parts. In this study, molding conditions including melt temperature, mold temperature, packing pressure and injection speed on the mechanical properties particularly the weld line strength of injection molded Nylon6/Fluoromica nanocomposites were investigated. It is found that with the addition of nano-fluoromica particles the weld line strength becomes significantly weakens as compared to that of pure Nylon6 parts and non-welidline Nylon6/Fluoromica nanocomposites. As melt temperature, mold temperature, packing pressure and injection speed increases the weld line strength of molded nanocomposites also increases. Among processing conditions, packing pressure exhibits most significant effect on weld line strength.
A fundamental assumption of the TCP protocol is that packet losses indicate congestion on the network. This is a problem when using TCP over wireless links, because a noisy radio transmission may erroneously indicate ...
详细信息
In this paper, using the fuzzy theory and gray theory, a concept of the degree of fuzzy infection and a new reliability analysis method based on the relation of fuzzy infection were proposed, and the mathematical mode...
详细信息
Along with temperature changing, inner gas pressure of artillery liquid-air pressure equilibrator alters in a big range and deviates requiring value frequently, thereby resulting in excess hand-wheel force. In order t...
详细信息
Along with temperature changing, inner gas pressure of artillery liquid-air pressure equilibrator alters in a big range and deviates requiring value frequently, thereby resulting in excess hand-wheel force. In order to solve this problem, this paper studied a controlsystem that could compensate air pressure automatically. Through realizing auto-adjustment of equilibrator inner pressure, this systemcontrol hand-wheel force effectively and improve operation capability and aim speed of artillery.
暂无评论