Electric Control Devices Research Articles

Hole Making Machine Based on Double Eccentric Mechanism for CFRP/TiAl6V4 Stacks

Construction parts consisting of 2-layer composite materials made of carbon fiber reinforced plastic (CFRP) laminates and TiAl6V4 still need to be machined, whereby drill holes are frequently manufactured. Recently, it is well-known that Orbital drilling, which is also called Circular milling, Planetary drilling or Spiral drilling, is superior to conventional drilling for hole making of CFRP/TiAl6V4 stacks. The author newly developed hole making machine based on Double Eccentric Mechanism so that a cutting tool driven by one built-in air motor can rotate clockwise on its own axis at high speed, simultaneously can revolve counter-clockwise on eccentric axis at low speed (Yagishita, 2012). The driving mechanism of the machine is entirely different in that respect both high speed rotation and low speed revolution of cutting tool can be created by one built-in air motor from Novator's mechanism (PCT/SE2008/050719) which needs two driving sources.The purpose of this paper is that by replacing a built-in air motor used in the previous hole making machine with a built-in AC motor it is achieved to lighten the weight of the machine and also to be handy by applying electric control device. After that hole making tests are executed to CFRP/TiAl6V4 stacks by using a new type cemented carbide endmill having 6 blades.

Granular acoustic switches and logic elements

Electrical flow control devices are fundamental components in electrical appliances and computers; similarly, optical switches are essential in a number of communication, computation and quantum information-processing applications. An acoustic counterpart would use an acoustic (mechanical) signal to control the mechanical energy flow through a solid material. Although earlier research has demonstrated acoustic diodes or circulators, no acoustic switches with wide operational frequency ranges and controllability have been realized. Here we propose and demonstrate an acoustic switch based on a driven chain of spherical particles with a nonlinear contact force. We experimentally and numerically verify that this switching mechanism stems from a combination of nonlinearity and bandgap effects. We also realize the OR and AND acoustic logic elements by exploiting the nonlinear dynamical effects of the granular chain. We anticipate these results to enable the creation of novel acoustic devices for the control of mechanical energy flow in high-performance ultrasonic devices.

Design of Fruit Picking Device Based on the Automatic Control Technology

£oWith our country's labor cost increase and forestry operations to improve the degree of automation, the automatic picking device will be gradually adopted to pick fruit in the future. This paper discusses the design process of intelligent mobile platform, five axis manipulator, end effector, electrical control device which belong to the automatic fruit picking device. The device is installed in the automatic navigation system and visual identity system, can accurately locate the position and pick fruit. The CAD/CAE software device was mainly used to design and analysis model, and design efficiency, feasibility and scientific were improved. According to the current development trend of fruit species gradually increased, the manipulator hand can adjust, which can pick the different shapes of fruits, and is installed with a visual sensor, pressure sensor, position sensor in the manipulator, and the finger stress analysis was made. In addition, the application of S7-200 model of PLC and pneumatic technology is used in the picking device, so that the overall structure is compact, more stable.

Application Research of Electrical Supercharger for Improving Performances of Diesel Engine under Plateau Environment

Against the problems that the working performances deterioration of high-power engine under plateau environment, an electric supercharger system is designed by applying modern control and sensor technology, and after testing performances of the electric supercharger multiple times, the system is optimized according to the internal flow field distribution and export flow characteristics. The tests prove that the system which controlled by electric control device can achieve transient air supply rapidly. Then increased the air flow rate significantly, and it is able to recover the most of the power in low speed part, which propose the feasible way to the problem of engine intake air shortage under plateau environment.

Installation and control technology of the Haihe movable bridge, China

The Tianjin Haihe movable bridge in China has the largest span among similar bridges in Asia. Owing to the dual characteristics of being both a bridge and heavy machinery with mechanical, hydraulic, electric and intelligent control devices, the construction of its steel box girder requires appropriate installation and control technology. Because of the stringent on-site navigation restrictions and blockage conditions, as well as mechanical characteristics during construction, a semi-supported cantilever installation and erection scheme is proposed, in which a bridge-erecting machine, temporary steel pipe support, bridge cantilever construction and other traditional methods are used in combination. Unlike traditional bridge closure technologies, new alignment closure and central locking closure control technologies are employed. The latter requires that the locking device be precisely assembled and adjusted to be horizontal for the suitable operation of the central locking equipment. The execution of this construction practice shows that the technology is feasible and effective.

Uticaj atmosferskih uslova na rad elektroopreme poljoprivrednih traktora bez kabine

Models of tractors wihtout a cabs from production program of IMR, that was produced for domestic and foreign markets, were exposed to atmospheric conditions, which led to frequent failure in the work of the tractors especially electrical installations, control devices and instruments. The instrument panel of tractors with corresponding electrical equipments, in this case, was directly exposed with high and low temperatures and precipitation whose influence on correctness and continuity in the work of tractors is not insignificant. Tightness of electrical equipments which were installed on tractor specifically on the instrument panel is significant and solving this problem will directly affects the overall quality of tractors. Electrical equipments of tractors involves switches, bulbs, headlights, ignition whose components are of different materials which behave differently in relation to atmospheric conditions. Based on all of the above facts tractor manufacturer IMR conducted a comprehensive research of electrical equipments on tractors without a cabs, which was conducted in three phases. This paper transparently displays laboratory and experimental- exploitation test of electrical equipments before installation on tractors and upon failure to work, in terms of tightness.

Train Ethernet Backbone(TEB) 구성에 따른 신뢰도 분석

As the usage of the electric power train increases, the importance of the control network between the electric control devices grows. IEC proposed a revision of IEC-61375, a standard of the networking among electric devices within a train, to adopt Ethernet as a backbone of train network. This paper performed the ^_@span style=color:#cccccc ^_#reliability analysis of three configurations of Ethernet-based networking within a electric power train that are recommended in IEC-61375 standard. The analys^_@/span^_#^_@span style=color:#999999 ^_# ... ^_@/span^_#^_@a href=javascript:; onclick=nodeUse('NODE02106559|147003') style=color:#999999;font-size:14px;text-decoration:underline; ^_#전체 초록 보기^_@/a^_#

The Water Sump Cleaning Machine by Vacuum Suction

This article describes a vacuum water sump cleaning machine which is used to clean up coal mine water sump. Cleaning machine is composed of mechanical structure and electrical control devices. The parts of machine are made up of Walk the flatbed, storage mud tank, vacuum pumps, suction pipe, mud tubes, swing devices, control valves, suction pipe and pressure tracheal. When working, under the function of vacuum pumping, cleaning machine pulls out the vacuum from storage mud tank through the vacuum air feeder. As the vacuum level in the tank is increasing, under the function of atmospheric pressure outside world, the mud flows into the reservoir along the suction tube. When storage mud tank is full, vacuum pump automatically shut down. Turning off the vacuum valve and opening the pressure valve, the slime in the tank under the function of compressed air comes into the mine car through the row mud tube. The layout of this cleaning machine is reasonable, what is more, it is flexible and convenient to operate, so that it reduces the labor intensity significantly and improves the work efficiency of the clearance.

Implementation of Access Control System Based on CAN Communication

CAN communication developed for communication between electric control devices in vehicle, was recently applied to automatic breaking devices, and can also be applied to field bus for production automation. Recently, field bus is introduced in engine control etc., for large ship. In this paper, cabin access control system is implemented, based on CAN communication. The cabin access control system based on CAN communication consists of access control server, embedded system based on ARM9, and micro-controller built-in CAN controller. The access control server can be able to manage overall access control system by accessing with manager. And embedded system adopted ARM9 processor transmits access information of RFID reader controller connected with CAN networks to server, also performs access control. The embedded system carry CAN frames to server, so it is used as gateway.

압력·온도 변화에 따른 초고압 발생기 성능특성 연구

An ultra high- pressure system generally consists of a hydraulic power unit, an oil supply unit, an electrical power supply device, and an electrical control device. The hydraulic power unit supplies the hydraulic power to the intensifier to create generate ultra high pressure. The intensifier amplifies increases the pressure using the oil supplied from by the hydraulic power unit. The electrical supply devices and control devices maintain are provided for the electric motors, valves, and sensors. In this study, instead of a flow-control device, a pressure-control type device was mounted on a manifold block in the hydraulic power unit instead of the flow-control type. A servo valve was fitted in the intensifier, and the performance characteristics of the intensifier varied according to the variations of in the pressure cycle and with the temperature of the operating oil in the hydraulic power unit.

Severe childhood burns in the Czech Republic: risk factors and prevention.

To assess risk factors for paediatric burn injuries in the Czech Republic and to suggest preventive measures. This study included all children aged 0-16 years hospitalized during 1993-2000 at the Prague Burn Centre and data from the Czech Ministry of Health on national paediatric burn hospitalizations during 1996-2006. Personal, equipment and environmental risk factors were identified from hospital records. The incidence of burn admissions among 0-14 year-olds increased from 85 to 96 per 100,000 between 1996 and 2006, mainly due to a 13% increase among 1-4 year-olds. Between 1993-2000 and 2006, the proportion of burn victims in the country hospitalized at the Prague Burn Centre increased from 9% to 21%. Detailed data were available on 1064 children (64% boys). Around 31% of all burn hospitalizations were in 1 year-olds. Some 79% of burns occurred at home: 70% in the kitchen, 14% in the living room or bedroom and 11% in the bathroom. Of the 18% occurring outdoors, 80% involved boys. Scalds from hot liquids accounted for 70% of all burns. The mean hospital stay was 22 days for boys and 18 days for girls. Most burns involved scalds from hot liquids at home: beverages in kitchens and water in bathrooms. There is a need for passive preventive measures, such as redesigned domestic cooking and eating areas, safer electrical kettles and temperature control devices for bathrooms. Educational programmes should be developed for parents and caregivers. A national plan for child burn prevention with specific targets would be helpful.

Spherical membrane omnidirectional loudspeaker using a magnetostrictive bimetallic strip

The invention concerns an omnidirectional loudspeaker. This loudspeaker comprises a spherical membrane which includes spires formed of a strip (2) made of a magnetostrictive material, the spires being spiral wound according to a sphere; these spires are kept in place by an elastic support (1) so that, along with the support, they form a spherical membrane. The strip has two opposing faces (11, 12), one of which is directed towards the inside (I) of the sphere, the other being directed towards the outside (E) of the sphere, and two extremities (3, 4) situated in two diametrically opposing zones of the sphere so as to be connected to an electric control device (5) providing a signal corresponding to sound waves to be reproduced, and a device (7) for the continuous polarization of the membrane. According to the invention, one of the faces (11) of the strip (2) is at least partly coated with a thin coating (13) made of a rigid material. Invention may be applied for the diffusion of high quality omnidirectional sound waves.

Control Strategies for Electrical Drives

Drives are devices used for imposing controlled variations of speed to moving components of machine tools and plants. Each one consists of an hydraulic or pneumatic or electrical actuator supplied by a power amplifier connected to a control device. The trend is to use electric motor, static converters and control devices realized by microprocessors or VLSI circuits.End users and designers of industrial plants generally choose the drive between the already existing ones. Very rarely the control strategies which on the contrary determine he global performance are taken into consideration. The aim of this paper is to propose this classification of drives relating the desired static and dynamic behavior of the moving components to the possible control strategies. A suitable presentation of the drive system by means of block diagrams allows to fix a general criterion to select the control strategy Independently of electric motors and circuitry of converters and control deVices. In order put into relieve the advantage of the different control strategies the starting up responses of drives implementing different control strategies are compared. The external transients (speed) and the internal one (current, flux, active power) are shown for an inverter fed induction drive.The selection criterion is the original contribution of this paper which is devoted to non experts m electrical drives.

Method of Automatic Searching for Optomum Position of Centroid of Vehicles by Electric Control Device

Method of Automatic Searching for Optomum Position of Centroid of Vehicles by Electric Control Device

Sensitive apparatus for obtaining freezing curves: Purity of 4-aminopyridine

Freezing curves of highly-purified 4-aminopyridine have been obtained with an instrument of new design employing a gold crucible, a platinum resistance thermometer, electrical heating elements on crucible and heat shield, and accessory electrical control devices such that the temperature difference between crucible and shield could be maintained constant within 0·005° while the temperature of the 4-aminopyridine and crucible dropped through the freezing range. No stirring was used. Methods were devised for handling the data as the derivative of temperature with respect to time and of correcting the freezing curve for the heat capacity of the crucible and charge. Although interpretation of the freezing curves obtained on the 4-aminopyridine was confused by attack on the gold by the molten 4-aminopyridine, the initial impurity in the 4-aminopyridine was probably less than the detection limit, 0·001 mole %.

Modulating electric control devices

Design procedure for a precision electric controller-positioner is described. Minimization of on-off device null zones, and inherent increase in positioning accuracy, are achieved by incorporating a modulating electric actuator. The actuator design is divided into two major portions: mechanical and electrical. The mechanical portion is essentially a torque amplification device, where the high speed, low torque of a motor is converted to a low speed, high torque at the actuator output. For large amplification and high efficiency with a minimum of components and increased reliability, a positive drive belt and pulley in combination with a ball-bearing screw is used. The result is a series of actuators with output torques from 100 ft-lb to 3200 ft-lb with speed reductions of 500:1 to 1600:1 and mechanical efficiencies of 80 percent The electrical portion of the design incorporates a dc motor with good control characteristics. Control of the motor is accomplished with phase-controlled silicon controlled rectifiers. The motor speed is varied in proportion to an error signal, permitting the actuator to “creep” to within 0.2 percent of a position dictated by the control signal.

The blast furnace with newly developed charging equipment

The conventional charging equipment of a blast furnace is generally provided with complicated mechanisms and electric control devices. After a series of studies and experimentation, we have developed a new type of stationary charging apparatus, which has been installed on the newly relined No. 2 blast furnace of the Muroran Works of Fuji Iron & Steel Co., Ltd. We have thus succeeded in eliminating the over-complicated mechanisms and electric control devices at the furnace top. It has contributed remarkably to a savings in the cost of construction as well as in operation and maintenance. The equipment has proved to be particularly suitable to a blast furnace under a high top pressure operation system, because the apparatus has proved perfect in its ability to seal off the gases at the small bell.

An electrically controlled, pneumatically actuated high-power rheostat

Electrical power control device consisting of high power dissipation rheostat controlled by electropneumatic transducer for maintaining constant current to DC arcs

Paper 5: Electrical Control Devices for the Improvement of Adhesion

Paper 5: Electrical Control Devices for the Improvement of Adhesion

Preferred practices for electric control devices for aircraft

Preferred practices for electric control devices for aircraft