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.
An interesting about MAV and a research for flapping wing aero vehicle has been increased. It is required that take-off and landing abilities to lift up a vehicle by flapping motion to achieve a special purpose for flapping wing aero vehicle. An airfoil has to generate lift force more than a weight of the body to work take-off from the ground without additional force. MAV can generate enough lift...
An inherent variable stiffness approach was proposed to suppress the rebound and impact of the electrostatic switch due to waveform deviations. A simple clamped-guided beam spring with large deflection, which generated inherent cubic nonlinear restoring force, was adopted for implementation of the approach. The initial stiffness is very small but increases significantly with the displacement. In this...
Automation systems, as well as process control, has played a key role in the industry nowadays. For good system performance, it is necessary that mathematical model is closest to the real model, which is detailed in this work. The objective of this study is to present a modeling (considering the viscous friction), stability analysis and simple PID controller tuning using as an example, an arm with...
As a new actuator driven by Ampere force, Electro Magnetic Force driving Actuator (EMFA) is applicable to medium-high-voltage system with powerful output force, long stoke, simple structure and high reliability. In the paper, a new type of EMFA for 126kV VCB with single break is proposed on the basis of the mature manufacturing technology of 126kV vacuum interrupter. The model of EMFA is established...
To satisfy the requirement of controlling and protection of modern power grid, it is necessary to develop the fast switchgear switching quickly as the executive device. The advances of repulsion and permanent magnetic mechanism are combined fully, the hybrid fast operating mechanism constructed with electromagnetic repulsion and permanent magnetic mechanism was designed in the paper. The switching...
Three-dimensional stretching is needed to treat equinovarus, which deforms the patient's foot to plantarflexion, adduction, and inversion postures. We have prototyped a three-dimensional stretching machine that the patient can use for the treatment of equinovarus by him- or herself. By adopting a cable-driven mechanism with two independently controllable pneumatic actuators, the stretching machine...
In this paper, we report on the design of a portable set of starting blocks for personal training to provide immediate feedback on the quality of sprinters' starting performance. The prototype set features two portable starting blocks with embedded sensors and a microcontroller for data collection and analysis. Testing was conducted with sprinters to validate and gauge the overall functionality of...
Master-slave surgical robots have been studied and developed to support surgeons. Robotic functions such as motion scaling and hand shaking correction can extend the ability of surgeons. However, some problems are remaining in robotic surgery. Operation time which can become the burden to surgeons is still long. Surgeons must assess the situation, decide the next task correctly, and achieve tasks...
Vacuum Circuit Breaker (VCB) consists of the main frame with the operating mechanism and the main circuits including VI (Vacuum Interrupter). Especially, a VCB for the generator protection, which is used in a power plant, requires very large contact spring force because it has to be able to withstand the high short circuit current. In order to release closing energy of VCB, the cam type mechanism...
Tactile sensors are essential for robotic systems to interact safely and effectively with the external world. In particular, tri-axis tactile sensors are crucial for dexterous robotic manipulations by providing shear force for slip and contact angle detection. In this paper, we present a soft tri-axis tactile sensors using flexible coils and conductive films based on eddy-current effect. Prototypes...
This article shows development of a fixed wing Unmanned Aerial Vechicle (UAV) prototype with multi rotor control system. This model pretends increase flight time of multi rotor system using aerodynamic characteristics. The lift force generated by a wing reduce the required power of the motors to raise up the structure during horizontal forward flight. For airfoil selection and sizing of the wing,...
Cardiovascular disease, including atherosclerosis and critical limb ischemia, affects millions of people worldwide. There is a clinical need to base treatment decisions on quantitative analysis of the plaque composition. However, no reliable clinical methods to quantify the mechanical properties of plaque components and detect plaque vulnerability currently exist, particularly for coronary disease...
Piezoelectric ultrasonic motors (PUMs) are based on the concept of driving the runner by a mechanical vibration excited on the stator via the converse piezoelectric effect. They exhibit merits of small size, simple structure, quick response, high accuracy and resolution, self-locking when power off and a lack of electromagnetic radiation. The linear PUMs become the research focus in recent years as...
A U-shaped linear piezoelectric ultrasonic motor (PUM) was proposed, designed and tested in this work, in which three longitudinal transducers were used together to achieve the linear driving by two feet synchronously. Longitudinal vibrations of the transducers were generated with certain temporal shift to form the desired elliptical movements on the two driving feet. Finite element method (FEM) was...
Partitioned stator flux reversal permanent magnet (PS-FRPM) linear machine is a type of permanent magnet linear machine with dual active stators and one passive mover. Pervious work was shown that such a machine possesses the advantage of having big slot area leading to reduced phase resistance and consequently improved electric loading capability. In order to verify the finite element (FE) results,...
Simulation of the planar magnetic actuation of ferromagnetic bodies is proposed and experimentally verified in the framework of the system for precise positioning of miniature passive robots with two degrees of freedom. Major goal of presented development is to balance computational effort of the simulation with complexity of computational problem. Proposed methodology is developed for efficient simulation...
A switched reluctance linear tubular motor that is proposed as a simple and cheap drive for a water pumps, which are in need in developing countries, is analyzed in the paper. In order to develop a strong driving force at the reciprocating motion a double coil motor with two springs is proposed. Driving electromagnetic static forces are analyzed for various motor dimensions using FEM. Simulation results...
In this paper, we introduce a mechanical wheel design capable of step climbing toward more convenient utilization of personal aids such as wheelchairs and walkers. Uneven floors with dips and depressions, thresholds, and steps have still been encountered in our daily routines in spite of the promotion of barrier-free environments. To overcome these difficulties, a step-climbing mechanism and its device...
Introducing dummy slots is often applied to reduce cogging torque in permanent magnet synchronous machines. Although this solution always helps for smooth operation, its influence on noise and vibration (NV) performance needs more focused analysis. This paper employs two surface-mounted machines to investigate the effect of dummy slots, one of which is a 10-pole/12-slot machine (M1) with few magnetic-field...
The cycloid drive usually has a cycloidal wheel meshing with pins to achieve transmission. The profile of the cycloidal wheel is generally a curve derived from an epitrochoid. This paper presents two design types of cycloid drive, the cycloidal wheel profile of one is internal offset of epicycloid and the other is external offset of hypocycloid. Parametric 3-D models of the two design types are constructed...
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.