Abstract:
PROBLEM TO BE SOLVED: To provide an adjustable valve including a field responsive fluid within a passageway, and fluid flow adjustment through the passageway in a vibration damper. SOLUTION: A reduction of MR fluid allowing use of lighter-weight, less-expensive hydraulic fluids for flow through a damping valve 36 of a piston 25 is allowed. In another aspect, a damper 20 includes a mechanical adjustment means for manually adjusting the damping level. Adjustment is accomplished by a moveable permanent magnet, moveable pole piece, moveable pole-and-magnet assembly, or magnetic shunt. Manual adjustment may include a knob, lever, or cable actuation. Alternately, magnetic flux is provided by an electromagnet. The valve and damper are useful in any suspension system where a damper body 22 is attached to a frame component 12, such as a bicycle frame, and a piston rod 23 is attached to a suspension component, such as a bicycle's swing arm 14. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a compact and integral MR brake adaptable for use in a limited space for installation.SOLUTION: The compact and controllable brake includes: a rotor having first and second rotor surfaces, an outer periphery and at least one working portion proximate to or on the outer periphery; a shaft having the rotor connected at one end of the shaft so as to suppress the relative rotation therebetween; a housing including a first chamber housing which accommodates the rotor therein so as to allow rotation, and including a magnetic field generator which is arranged being spaced from the rotor, and is configured and positioned for conveying a magnetic flux extending through a controllable material between the field generator and working portion, in a direction toward at least one working portion of the rotor. The controllable material contained within the first chamber is in contact with at least one working portion of the rotor, an electronic device is provided for controlling and/or monitoring the operation of the brake, and control electronic device is housed in a second chamber.
Abstract:
PROBLEM TO BE SOLVED: To provide a compact and integrated MR brake adaptable for use in a limited space for installation. SOLUTION: The compact and controllable brake includes: a rotor having first and second rotor surfaces, an outer periphery and at least one working portion proximate to or on the outer periphery; a shaft having the rotor connected at one end of the shaft in a manner to restrain the relative rotation therebetween; a housing including a first chamber housing which accommodates the rotor therein in a manner to allow rotation, and including a magnetic field generator 29 which is arranged being spaced from the rotor, and is configured and positioned for conveying a magnetic flux extending through a controllable material between the field generator and working portion, in a direction toward at least one working portion of the rotor. The controllable material contained within the first chamber is in contact with at least one working portion of the rotor, an electronic device is provided for controlling and/or monitoring the operation of the brake, and control electronics is housed in the second chamber. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
Improvements to slip rings and methods for the operation thereof include an improved slip ring assembly that has a stationary element, a rotating element rotatable with respect to the stationary element, a bearing assembly coupled between the stationary element and the rotating element, and one or more contact brushes on one of the stationary element or the rotating element. In some embodiments, the bearing assembly includes a primary bearing, a secondary bearing, a shear pin coupling the secondary bearing to the primary bearing, and an electrical monitoring circuit in communication with the shear pin. In some embodiments, the one or more contact brushes includes one or more metal fiber brushes constructed of a plurality of metal fibers that are configured to transmit one or more of electrical power or data between the stationary element and the rotating element.
Abstract:
An adjustable valve including a passageway, a field responsive fluid within the passageway, and fluid flow adjustment through the passageway. The valve is preferably used in a vibration damper. One damper includes a body, a piston, first and second chambers, a damping valve, a piston rod, an auxiliary chamber, a passageway interconnecting to the auxiliary chamber, a field responsive fluid, a field responsive fluid valve for controlling flow to the auxiliary chamber, and pressurization means. Preferably included is a cavity partition having field responsive fluid disposed on one side and non-field responsive fluid disposed on the other. This allows a reduction of MR fluid allowing use of lighter-weight, less-expensive, hydraulic fluids for flow through the piston's damping valve. In another aspect, the damper includes mechanical adjustment means for manually adjusting the damping level. Adjustment is accomplished by a moveable permanent magnet, moveable pole piece, moveable pole-and-magnet assembly, or magnetic shunt. Manual adjustment may include a knob, lever, or cable actuation. Alternately, magnetic flux is provided by an electromagnet. The valve and damper finds utility in any suspension system where a damper body is attached to a frame component, such as a bicycle frame, and the piston rod is attached to a suspension component, such as a bicycle's swingarm.
Abstract:
Active noise and vibration control (ANVC) systems and methods are provided. The systems and methods include providing sensors configured to detect vibration of a structure and a controller in electrical communication with the sensors. The controller includes a hardware processor and a memory element configured to process the vibration detected by the sensors, generate a force control command signal, and output the force control command signal via an interface. The systems and methods include provisions for at least one circular force generator (CFG) in electrical communication with the controller, the CFG is configured to execute the force control command signal output from the controller and produce a force that substantially cancels the vibration force. In some aspects, one or more CFGs control different vibration frequencies causing unwanted vibrations or acoustical tones. In some aspects, one or more CFG's control unwanted vibrations during some conditions and noise during other conditions.
Abstract:
Methods and systems for monitoring rotating shafts (28) and couplings (30) in an aircraft vehicle propulsion system (22) is described. The measurement system/method provides for accurate and precise monitoring of a rotating shaft flexible coupling in a fixed wing aircraft vehicle propulsion system (22). The measurement system/method provides for a high reliability short take off vertical landing fixed wing aircraft in which the vehicle's dynamically rotating drive shaft system (28) and couplings (30) are monitored in real time. The vehicular shaft coupling misalignment measuring system utilizes multiple positional sensors (40) to provide highly reliable and precise determination of the dynamic characteristics of the rotating sensor target components of the propulsion system drive shaft (28). The relative position of the sensors (40) is rigidly fixed externally from the rotating targets with a structural frame. The misalignment measuring system provides a misalignment measurement of the propulsion system drive shaft flexible coupling which relates to a critical performance of rotating shaft (28) coupling in the operating of an aircraft vehicle (20). The method/system provides for monitoring a rotating drive shaft system and dynamically measuring a rotating drive shaft coupling in a fixed wing aircraft propulsion system (22).
Abstract:
The land vehicle includes a body, a power plant and a plurality of land engagers, the land engagers for engaging land and propelling the land vehicle across land. The land vehicle includes a controllable suspension system, the controllable suspension system for controlling suspension movements between the body and the land engagers. The land vehicle includes a computer system and suspension sensors located proximate the land engagers for measuring suspension parameters representative of suspension movements between the body and the land engagers and outputting a plurality of suspension sensor measurement outputs. The land vehicle includes controllable force suspension members located proximate the land engagers and the suspension sensors, the controllable force suspension members applying suspension travel forces between the body and the land engagers to control the suspension movements. The land vehicle computer system includes a controllable suspension system algorithm for controlling the controllable force suspension members to control vehicle body motion and the suspension movements between the body and the land engagers, and a health usage monitoring algorithm for monitoring sensors and assessing a health and a usage of the vehicle and its suspension components.
Abstract:
A rotary wing aircraft including a vehicle vibration control system. The vehicle vibration control system includes a rotating hub mounted vibration control system, the rotating hub mounted vibration control system mounted to the rotating rotary wing hub with the rotating hub mounted vibration control system rotating with the rotating rotary wing hub. The vehicle vibration control system includes a rotary wing aircraft member sensor for outputting rotary wing aircraft member data correlating to the relative rotation of the rotating rotary wing hub member rotating relative to the nonrotating body, at least a first nonrotating body vibration sensor, the at least first nonrotating body vibration sensor outputting at least first nonrotating body vibration sensor data correlating to vibrations, at least a first nonrotating body circular force generator, the at least a first nonrotating body circular force generator fixedly coupled with the nonrotating body, a distributed force generation data communications network link, the distributed force generation data communications system network link linking together at least the first nonrotating body circular force generator and the rotating hub mounted vibration control system wherein the rotating hub mounted vibration control system and the first nonrotating body circular force generator communicate force generation vibration control data through the distributed force generation data communications network, the at least first nonrotating body circular force generator controlled to produce a rotating force with a controllable rotating force magnitude and a controllable rotating force phase, the controllable rotating force magnitude controlled from a minimal force magnitude up to a maximum force magnitude, and with the controllable rotating force phase controlled in reference to the rotary wing aircraft member sensor data correlating to the relative rotation of the rotating rotary wing hubrotating relative to the nonrotating body wherein the vibration sensed by the at least first nonrotating body vibration sensor is reduced.
Abstract:
Helicopters and rotary wing aircraft (20) vibration control system (30) for controlling rotating machinery vibrations are provided for rotating machinery vibrations correlating with operational rotating frequencies. The vibration control system includes a first imbalance rotor with a first mass concentration (61), the first imbalance rotor driven to rotate with a first controllable phase, a second imbalance rotor (62) with a second mass concentration (63), the second imbalance rotor driven to rotate with a second controllable phase, a third imbalance rotor (64) with a third mass concentration, the third imbalance rotor driven to rotate with a third controllable phase, a fourth imbalance rotor (66) with a fourth mass concentration (67), the fourth imbalance rotor driven to rotate with a fourth controllable phase. The vibration control system includes vibration sensors for monitoring the vibration and outputting vibration signals. The vibration control system includes a controller, the controller receiving an operational rotating frequency reference signal, the controller also receiving the vibration sensor signals with the controller controlling the first imbalance rotor first controllable phase, the second imbalance rotor second controllable phase, the third imbalance rotor third controllable phase, and the fourth. imbalance rotor fourth controllable phase relative to the rotating frequency reference -signal to produce a biaxial force which reduces the vibration signals outputted from the vibration sensors.