98 results about "Roll moment" patented technology

The invention relates to a mechanism to control the pitch and / or roll and / or center of gravity of a vehicle. The first embodiment is a track-based mass transfer system in which pathways are positioned along or radially terminate at a central horizontal plane of the vehicle to move one or more mass transfer devices to a desired location to control the pitch and / or roll and / or center of gravity of the vehicle. A second embodiment is a fluid mass distribution system in which one or more conduits selectively distribute a fluid to one or more tanks positioned near a central horizontal plane of the vehicle to control the pitch and / or roll and / or center of gravity of the vehicle.

A method of controlling wing position and velocity for a flapping wing air vehicle provides six-degrees-of-freedom movement for the aircraft through a split-cycle constant-period frequency modulation with wing bias method that generates time-varying upstroke and downstroke wing position commands for wing planforms to produce nonharmonic wing flapping trajectories that generate non-zero, cycle averaged wing drag and alter the location of the cycle-averaged center of pressure of the wings relative to the center of gravity of the aircraft to cause horizontal translation forces, rolling moments and pitching moments of the aircraft.

A rollover sensing system (12) that may be used in the determination of when to deploy restraints in the vehicle. The rollover sensing system (12) may include lateral acceleration sensors (32), a roll rate sensor (18), and a roll angle detector (20). A control circuit (16) determines a roll moment of inertia as a function of the lateral acceleration, a trip point length as a function of the lateral acceleration and a trip point angle as a function of the lateral acceleration. The control circuit (16) determines a rollover threshold in response to the roll rate signal, the roll angle signal, the trip point length, the roll moment of inertia, and the trip point length. The control circuit generates a control signal for the deployment circuit in response to the rollover threshold.

A method and apparatus for enhancing the ability of a human to run and jump with comfort comparable to running barefoot on a trampoline and with control comparable to that of the unaided human form, yet with freedom from ankle-turning roll moments associated with substantial ground contact member (GCM) extension downwardly away from the sole of the foot including, a resiliently urged GCM constrained to two degrees of freedom: translation away from the sole of the user's foot and rotation about a longitudinal axis at ground level. The apparatus relates flexure of a GCM toe pressure member to comparable flexure of user's toes at the metatarsal joints. The apparatus also incorporates lower leg to ankle pivot bracing, and extends the GCM in downward direction parallel to the lower leg while mimicking user ankle articulation with parallelism-maintaining rotation about a downwardly resiliently urged transverse pivot axis similar to the user's own ankle joint for extended travel.

A lift platform with a kinesthetic control system that is coupled to means for altering air flow through the first and second longitudinally-spaced ducts comprising the lift platform is provided. The control system includes a control handle bar with left and right hand grips, and first and second control roll bars located on either side of the lift platform's central cowling. Forward / rearward movement of the control handle bar from a neutral position generates nose-down / nose-up pitching moments, respectively; counterclockwise / clockwise movement of the control handle bar from the neutral position generates counterclockwise rotation / clockwise rotation of the lift platform about a lift platform vertical centerline; and left movement / right movement of the control roll bars generates left roll / right roll moments about the lift platform roll axis.

A stabilizer system for a vehicle includes a stabilizer bar and an actuator and that executes a control actively changing stiffness of the stabilizer bar in accordance with roll moment acting on a body of the vehicle. Each of a situation in which the vehicle is running straightforward and a situation in which a torque generating direction of a motor of the actuator changes in opposite direction plural times is identified as a specific situation. In the specific situation, a control of changing an operation mode of the motor such that presence or absence of occurrence of resistance of the actuator against its operation by external input force is changeable, and a control of limiting a supply current to the motor such that the torque generating direction of the motor is inhibited from coinciding with a direction away from a neutral position are executed.

The invention discloses a high-precision device for measuring a rolling moment based on a mechanical bearing support, which is lower in researching and testing costs, higher in precision as comparison with the conversional high-precision rolling moment strain gauge balance and capable of meeting the requirement for small rolling moment wind channel measurement of a wind channel model in various attack angle states. The high-precision device comprises a simple component rolling moment balance (200) and a mechanical bearing support (100), wherein the mechanical bearing support (100) comprises a shell assembly (101), a rotary inner sleeve assembly (102) and a central shaft assembly (103); the rotary inner sleeve assembly (102) is arranged inside the shell assembly (101) by using an outer ring bearing and arranged on the central shaft assembly (103) by using an inner ring bearing; the front end of the shell assembly (101) is fixedly provided with a measured wind channel model (300); and the central shaft assembly (103) is provided with the simple component rolling moment balance (200) and fixed on a model supporting rod (400).

A method and apparatus for varying the twist of a wing such that induced drag is minimized or reduced during cruise and lift is maximized or increased at least during takeoff and landings. In addition, variations in the twist may produce yawing and rolling moments. The twist amount is varied pursuant to the operating conditions, including those parameters used to determine the lift coefficient. The twist for reducing induced drag and / or improving lift may be employed by geometric or aerodynamic twist, including full span control surfaces used to provide roll control, high-lift and reduced induced drag. The twist may also be employed by twisting just a portion of the wing or the entire wing, either geometrically or aerodynamically.

A suspension system for a vehicle, including: a stabilizer apparatus configured to change a stabilizer force by an operation of an actuator; a pair of absorbers of a hydraulic type each configured to change a damping coefficient thereof: a control device which includes (a) a stabilizer-force control portion configured to control the stabilizer force in accordance with roll moment acting on a body of the vehicle and (b) a damping-coefficient control portion configured to control the damping coefficient of each of the absorbers, wherein the damping-coefficient control portion is configured to execute a damping-coefficient reduction control for reducing the damping coefficient of each of the absorbers when a prescribed condition is satisfied and wherein the stabilizer-force control portion is configured to increase the stabilizer force in an instance where the damping-coefficient reduction control is under execution, as compared with an instance where the damping-coefficient reduction control is not under execution.

An aircraft attitude control configuration enables control surfaces to provide attitude control for an aircraft at hover or low air speed conditions. The aircraft attitude control configuration includes a thruster mounted to an aircraft for thrusting air, a first control surface kinematically coupled to the aircraft at a position downstream of the thruster, and a second control surface kinematically coupled to the aircraft at a position downstream of the thruster, the second control surface being differentially movable with respect to the first control surface such that a portion of the thrusted air from the thruster generates a first vector force on the first control surface and another portion of the thrusted air generates a second vector force on the second control surface, so that the first and the second vector forces provide a net roll moment about the Y-Roll axis.

A system and method protects against rollover in a vehicle by employing an array of linear acceleration sensors. A control module includes, among other things, a model of the vehicle dynamics and a model of the array of sensors. A state vector is estimated based on the detected accelerations, the model of the vehicle dynamics and the model of the sensors. A control signal is generated based on the state vector, and the roll moment of the vehicle is reduced based on the control signal.

Monorail vehicle that travels on a non-featured rail with substantial profile variation and controls roll attitude, lateral location, and loading through judicious placement of the vehicle's center of gravity without using springs or suspensions. The vehicle has a bogie for engaging the non-featured rail so the center of gravity has a lateral offset r1 from the rail centerline to produce a roll moment Nr determined by vehicle's mass and value of r1. The center of gravity also has a vertical offset r2. The bogie uses first and second assemblies for engaging the rail to produce a pair of surface normal reaction forces to thus control roll attitude and loading by the placement of the center of gravity, thereby enabling accurate alignment of the monorail vehicle.

A ducted fan for a VTOL vehicle includes a substantially cylindrical duct having an inlet at an upper end and an outlet at a lower end, and an air mover unit located within the substantially cylindrical duct. The duct also includes inner and outer wall portions and a substantially annular upper lip connecting the inner and outer wall portions, thus defining the inlet. The substantially annular upper lip has opposed fore and aft portions and opposed side portions and is provided with at least first and second openings, respectively, at each of the opposed side portions. The first and second arrays of openings permit flow of air into at least first and second respective chambers formed within the duct, the first and second chambers connected by at least one passageway to thereby enable substantial equalization of surface pressure at the opposed side portions of the substantially annular upper lip.

In rotorcraft having rotors on multiple masts, a controller causes opposing roll mast moments to be applied to the different rotors. In preferred embodiments, the opposing roll moment is the result of increasing the lift on the advancing blade and reducing the lift on the retreating blade on the second rotor. This can be accomplished in any suitable manner, such as by applying differential cyclic roll control to the two rotors by tilting the two Swashplates of the two rotors or by using Individual Blade Control (IBC).

A lift platform with a kinesthetic control system that is coupled to means for altering air flow through the first and second longitudinally-spaced ducts comprising the lift platform is provided. The control system includes a control handle bar with left and right hand grips, and first and second control roll bars located on either side of the lift platform's central cowling. Forward / rearward movement of the control handle bar from a neutral position generates nose-down / nose-up pitching moments, respectively; counterclockwise / clockwise movement of the control handle bar from the neutral position generates counterclockwise rotation / clockwise rotation of the lift platform about a lift platform vertical centerline; and left movement / right movement of the control roll bars generates left roll / right roll moments about the lift platform roll axis.

The present invention is to stabilize behavior of brake pads at the time of braking of a disc brake so as to suppress generation of brake noise, and also to reduce the roll moment of the brake pads generated at the time of braking so as to suppress uneven abrasion of linings. A back plate (41) of a brake pad (40) is biased inward in the rotor radial direction by a plate spring (80). The back plate (41) is engaged at two points with an inner periphery support shaft (61) provided integrally with a caliper (20) on a V-shape inner peripheral abutment (41a) (provided in the back plate (41) on the inner side of a lining (42) in the rotor radial direction and on the center in the rotor circumferential direction), and engaged at one point with an outer periphery support shaft (62) provided integrally with the caliper (20) on an outer peripheral abutment (41b) (provided in the back plate (41) on the outer side of the lining (42) in the rotor radial direction and on the center in the rotor circumferential direction).

A method for equalizing rolling moments at high advance ratios is disclosed including impelling an aircraft in a forward direction at an airspeed by means of a thrust source and rotating a rotor of the aircraft at an angular velocity with respect to the airspeed effective to cause a positive total lift on each blade due to air flow over the blades in the retreating direction when the blade is moving in the retreating direction. The rotor includes an even number of blades placed at equal angular intervals around the rotor hub. One or both of cyclic pitch and rotor angle of attack are adjusted such that a rolling moment of the retreating blade due to reverse air flow is between 0.3 and 0.7 times a rolling moment on the advancing blade due to lift.

The invention discloses an automobile kinetics dynamical property test system based on integrated rollers. The system is composed of a measurement and control system and a plurality of integrated rollers; the number and arrangement of the integrated rollers are determined by automobile type and test requirement, each integrated roller consists of a central shaft, a brake fixing bracket, a brake disc, a floating-caliper brake, a roller, a six-component sensor, a rotation speed sensor, a code disc, an external rotor electric machine and a bracket. The invention has the beneficial effects that the six-component sensor is used for measuring tangential force, axial force, vertical force, turning moment, moment resulting from sideway and yawing moment to realize measurement on tyre longitudinal force, yawing force, vertical load, turning moment, moment resulting from sideway and aligning torque, and that the test system has the advantages of simple and compact structure, reduced installation space and the like. The attached drawings are diagrammatic drawings for structure of the integrated rollers and connection between the integrated rollers and the measurement and control system.

In a target rotational angle determining routine, based on a roll moment and longitudinal acceleration that are calculated, target rotational angles of actuators on a subject side (one of front-wheel and rear-wheel sides) and a counterpart side are obtained using a common map. An actual rotational angle on the counterpart side is read. It is determined whether the absolute value of a difference obtained by subtracting the actual rotational angle supplied from the counterpart side from the target rotational angle on the counterpart side that is obtained by the subject side is equal to or greater than a set angle difference Δθ0. If YES, it is determined that roll stiffness on the counterpart side is insufficient, and the target rotational angle on the subject side is changed so that a roll stiffness distribution ratio between the front-wheel side and the rear-wheel side comes close to a set distribution ratio.

Roll rigidity of a vehicle is controlled optimally regardless of the situation of turning motion of the vehicle by estimating the transverse acceleration of the vehicle at the front wheel position and the rear wheel position, and controlling a roll rigidity varying means at the front wheel position and the rear wheel position by a controlled variable based on the transverse acceleration thus estimated. Target roll angle of the vehicle is operated based on the actual transverse acceleration of the vehicle at the center of gravity, and transverse acceleration of the vehicle at the front wheel position and the rear wheel position is operated by correcting the transverse acceleration of the vehicle at the center of gravity by a correction amount of transverse acceleration based on the yaw rate of the vehicle. Thereafter, target anti-roll moments at the front wheel position and the rear wheel position are operated based on the target roll angle and the acceleration of the vehicle at the front wheel position and the rear wheel position, and the active stabilizers of the front wheel and the rear wheel are controlled based on these target anti-roll moments.

An automobile against side-roll stabilizing device and suspension system and automobile, wherein the automobile against side-roll stabilizing device includes a first hydraulic pressure cylinder and a second hydraulic pressure cylinder, respectively used for being installed inside a left automobile wheel and inside a right automobile wheel; the push rods of the first hydraulic pressure cylinder, one of the bottom ends of the push rods is connected with a sprung mass, the other is connected with an unsprung mass; the push rods of the second hydraulic pressure cylinder, one of the bottom ends of the push rods is connected with the sprung mass, the other is connected with the unsprung mass; the device also includes a first oil gas chamber and a second oil gas chamber, the lower parts of the first oil gas chamber and the second oil gas chamber are hydraulic pressure oil, the upper parts are compressed gases. When the beat amplitudes of the left wheel and the right wheel are inconsistent, the push rods inside the first hydraulic pressure cylinder and the second hydraulic pressure cylinder apply forces to the automobile body in varying directions, the forces from varying directions produce an anti side roll moment, obstructing the automobile to further side roll.

The present invention is to stabilize behavior of brake pads at the time of braking of a disc brake so as to suppress generation of brake noise, and also to reduce the roll moment of the brake pads generated at the time of braking so as to suppress uneven abrasion of linings. A back plate (41) of a brake pad (40) is biased inward in the rotor radial direction by a plate spring (80). The back plate (41) is engaged at two points with an inner periphery support shaft (61) provided integrally with a caliper (20) on a V-shape inner peripheral abutment (41a) (provided in the back plate (41) on the inner side of a lining (42) in the rotor radial direction and on the center in the rotor circumferential direction), and engaged at one point with an outer periphery support shaft (62) provided integrally with the caliper (20) on an outer peripheral abutment (41b) (provided in the back plate (41) on the outer side of the lining (42) in the rotor radial direction and on the center in the rotor circumferential direction).