Solenoid

About: Solenoid is a research topic. Over the lifetime, 19278 publications have been published within this topic receiving 114721 citations.

Roadside spray apparatus

Abstract: A roadside spray apparatus primarily adapted for the precision application of chemical herbicides is mounted by means of a frame support on the front bumper of a vehicle and is monitored by the driver of the vehicle using one hand to operate electrical switches connected to solenoid valves controlling the spray through nozzles mounted on a spray boom, which boom can be adjusted laterally and can be pivoted from one side of the vehicle to the other, with the nozzles attached to coil springs on the spray boom, and with an adjustable mirror and adjustable guides located on the spray apparatus in view of the driver of the vehicle

Control system for a power steering device

Abstract: A control system for a power steering device of a vehicle, wherein the rotational angular position of a steering wheel, the vehicle driving speed and the steering torque applied to the steering wheel are detected and processed by a digital computer. The computer selects one of plural control values stored in a memory device based upon the detected steering torque and the detected vehicle speed and outputs the selected one of the control values along with solenoid selection data which is determined based upon the detected rotary angular position data. An electric current having a value corresponding to the selected one of the control values is applied from a solenoid drive circuit to one of a pair of solenoids, so that a four-way open center type solenoid valve having the solenoids controls the supply and exhaust of pressurized fluid to and away from a power cylinder of the power steering device in accordance with the detected vehicle driving speed and the detected steering torque.

Torsional mode magnetostrictive patch transducer array employing a modified planar solenoid array coil for pipe inspection

Abstract: In recent investigations, the application of the transducers used in plates has been extended to pipe inspection with circumferential arrays because of the similar particle displacement patterns of some modes between plate and pipe, such as SH and torsional modes. Motivated by the configuration of magnetostrictive patch transducer (MPT), in which a planar solenoid array (PSA) coil was adopted to generate SH waves in plates, we proposed a MPTs array employing a modified planar solenoid array (MPSA) coil, i.e. MPSA coil-MPTs array, for generating and receiving the torsional mode in pipes. The configuration of the MPSA coil modified from PSA coil is suitable to be arranged on the pipe surface and can generate high-power waves. In the suggested configuration of MPT, because the direction of the actuating dynamic magnetic field produced by the MPSA coil is orthogonal to the direction of the static magnetic field produced by the permanent magnets in the magnetostrictive patch, the shear deformation induced by the magnetostriction in the patch will be delivered to the pipe, thus generating the torsional mode. First, it was experimentally verified that the fundamental torsional mode, T(0,1), could be effectively generated and received in pipes with the developed MPSA coil-MPTs array. Then, we studied the relationship between the frequency response characteristic of the developed MPSA coil-MPTs array and the interval defined by the distance of adjacent solenoids in the MPSA coil. Simultaneously, the circumferential crack defects in pipe were successfully identified. Finally, the performance of the MPSA coil-MPTs array was compared with that of previous meander coil-MPTs array. The comparison results demonstrated that the developed MPSA coil-MPTs array could enhance the power of the torsional mode.

Heat pump device

Abstract: PURPOSE: To prevent quantity of a coolant circulating along a coolant circuit from decreasing by providing solenoid valves at the front and rear stages of an evaporator circuit and also providing a control circuit for operating these solenoid valves and carrying out the pumping down of the evaporator circuit on the side not utilized. CONSTITUTION: The heat pump device comprises solenoid valves 14c, 14d, 15c and 15d which are provided respectively at the front stages and the rear stages of evaporator circuits C and D and open and close the evaporator circuits C and D, and a control circuit for operating these solenoid valves and carrying out the pumping down of the evaporator circuit or the side not utilized. According to this structure, during the stoppage of the heat pump device, all the solenoid valves 14c, 14d, 15c and 15d are closed. Therefore, it is possible to reduce the quantity of the coolant moving to evaporators 13c and 13d. Further, at the time of starting the heat pump device, the solenoid valves 14c and 15c of the circuit C of the utilizing side evaporator 13c are closed and the solenoid valves 14d and 15d are opened. Thus, the coolant flows to the evaporator 13d on the side not utilized. After operating for a predetermined time, the solenoid valve 15d is closed, and the solenoid valve 14c and 15c are opened and the evaporator 13d stands still and an operation utilizing the evaporator 13c is carried out. Consequently, the evaporator 13d can recover the stored coolant and the freezer oil. COPYRIGHT: (C)1989,JPO&Japio

The physics of tokamak start-upa)

Abstract: Tokamak start-up on present-day devices usually relies on inductively induced voltage from a central solenoid. In some cases, inductive startup is assisted with auxiliary power from electron cyclotron radio frequency heating. International Thermonuclear Experimental Reactor, the National Spherical Torus Experiment Upgrade and JT60, now under construction, will make use of the understanding gained from present-day devices to ensure successful start-up. Design of a spherical tokamak (ST) with DT capability for nuclear component testing would require an alternative to a central solenoid because the small central column in an ST has insufficient space to provide shielding for the insulators in the solenoid. Alternative start-up techniques such as induction using outer poloidal field coils, electron Bernstein wave start-up, coaxial helicity injection, and point source helicity injection have been used with success, but require demonstration of scaling to higher plasma current.