The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This research analyzes the vibration phenomenon in certain types of fractional slot permanent magnet synchronous machines that excites low order radial forces. The study utilizes a motor topology from the group having 12-stator slots and 10-rotor poles (12s10p) to identify and propose several design-based solutions to reduce vibration. Some electromagnetic design feature variations in the motor geometry...
This paper presents an evaluation of noise and vibration in a distributed winding permanent magnet synchronous motor driven by voltage source pulse width modulation (PWM) inverters. The permanent magnet synchronous motor (PMSM) is widely used as an important driving source in a variety of fields. However, it generates electromagnetic noise and vibration because of PWM inverters. This paper describes...
A battery-free power management circuit (PMC) for an impact-type piezoelectric energy harvester for micro wind is presented in this paper. As the energy generated by micro wind is intermittent, sleep mode is adopted for the PMC to save power. A new energy sensing circuit is designed to detect the energy level generated by the piezoelectric cantilever and then to control the operation modes, sleep...
This paper addresses the evaluation of an algebraic modal parameter identification technique on vibrating mechanical systems. This identification scheme is thought to be applied as an updating modal parameters estimator for some adaptive-like vibration absorption controller such as positive position feedback (PPF) or to be used in the context of structural health monitoring. In addition to this, we...
The Model Based Systems Engineering (MBSE) is herein applied to design a physical node for an interconnected system, based upon data exchange. As a test case the concept of smart bearing equipped with sensors to be used to monitor a cold rolling mill is preliminarily developed. The paper focuses on the two activities of inner and outer monitoring of the bearing service. Outer monitoring is aimed at...
This paper investigates the influence of converter-fed operation on magnetic forces and radial vibration in a hydrogenerator. Flux density distribution is computed using time-stepping finite element (FE) analysis and used to calculate force density distribution based on Maxwell stress tensor. Both temporal and spatial characteristics of selected flux density and force density waves are studied. Important...
This paper describes user's mechanical vibration and shock while riding the electric wheelchair on the different road conditions. We conduct experiments for measurement of 9-Axis data by using the 9-Axis sensor implemented on the actual electric wheelchair. Then, we investigate the relevance between the comfort of wheelchair user and the vibration. The vibration characteristics of the human body and...
We developed Body-Braille as an information transmission support tool for the deaf-blind using vibrations. With two-point Body-Braille, a Braille pattern is divided into three blocks and transmitted via vibrations using two vibration motors. In each block, four types of information, “left,” “right,” “both,” and “no exist,” are transmitted via two vibration motors. For ease of wearing, we wish to express...
With the development of electric vehicles, more and more attentions have been put on understanding and attenuating the noise, vibration, and harshness (NVH) of traction machines. NVH in machines are mainly caused by the electromagnetic force, which is complex vector functions of both time and space, and models are desired for accurately evaluating its characteristics. In this paper, analytical models...
Electric vehicles (EVs) have attracted growing interests worldwide because of their advantages of zero emission, low noise and energy saving. Fractional slot interior permanent magnet synchronous motors (IPMSMs) are attractive for EV applications due to their high power density and high efficiency. However, the fractional-slot IPMSMs normally suffer large vibration noise induced by the abundant harmonics...
This paper deals with induction machines bearing failures detection and diagnosis using vibration and temperature signals. It proposes the use of a new Classical Mechanics-inspired Optimization (CMO) metaheuristic for data clustering. To ensure failure detection, transitions from a state to another is analyzed in order to form a transitional model between system states generated by the clustering...
The lack of automatic diagnostics of slowly changing processes inherent in water turbines in hydroelectric power plants can cause costly errors and accidents. Emerson provides the solution which can detect and monitor these factors.
The satellite in geostationary orbit present many flexibility due to flexible appendages, solar pressure and fuel sloshing in the tanks which they pose great challenges for accurate attitude control. In this paper, an anti-disturbance proportional-derivative (PD) controller is designed to stabilize the attitude while rejecting the effects of flexible vibrations, environmental disturbances, and unmodeled...
The aim of the present paper is to diagnose the mechanical faults in induction motors. We have chosen this part in order to contribute to the diagnosis of electrical machines. The raising of stator current allows detecting the fatigue of the machine failure. The manner of the treatment decides the efficiency of the applied technique. We have examined the static eccentricity fault by a vibration signal...
There are BBots (BristleBots) consist of a single and double vibration motor design. A single-actuated robot agent is more preferable due to its lower cost and energy consumption. Some studies reporting and modeling the linear motion single-actuated BBots are present in the literature. On the other hand, few of them included an explanation on its rotational motion. In this study, the planar motion...
Patients with neurodegenerative disorder suffers from performing their daily tasks resulting in a reduced community ambulation. Tremor is suggested to be reduced by mechanical means using passive vibration controller. Human hand is modeled in the horizontal plane to describe the flexion-extension motion at the shoulder, elbow and wrist joints. Tremor is modeled as sinusoidal function driven at two...
In this article, our aim lies in the design of control schemes for suppressing the vibration of a flexible string system in the presence of external disturbances. To this end, the boundary and distributed controllers are developed to globally stabilize the string system at small neighbor region around the origin. Besides, the boundary disturbance observer is proposed to deal with the boundary disturbance,...
There is an increase in the number of elderly people living alone, whose children make living in other cities or even other countries. Once they are ill or in an accident, they can only depend on staff of nursing care centers, instead of their children. Therefore, a system which help the elderly to live in their apartment alone is needed. Through the investigation of the elderly living in the community,...
The Lagrange principle and hypothetical modal method are used to derive the dynamic equations of the hydraulic rigid-flexible manipulator. An integral sliding mode control scheme is proposed, and the hyperbolic tangent function is used to deal with the actuator saturation. The stability of closed loop system is proved by Lyapunov function. Simulation results show the proposed method can satisfy the...
In this paper, one fiber Bragg grating (FBG) vibration sensor is proposed and the application of weak signal processing based on Duffing oscillator model in optical fiber vibration sensors is studied. Frequency response and amplitude sensitivity experiments are all carried out to verify the characteristics of this FBG vibration sensor. By calculating the maximum Lyapunov exponent, these experiment...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.