32 results about "Rotational dynamics" patented technology

The invention provides a power distribution method for a hub-motor-driven vehicle. According to a wheel rotating dynamic model, a longitudinal force and a lateral force, which are obtained in the distribution, are controlled by using a sliding-mode control theory in a follow-up manner to obtain an output torque of each electric wheel and a rotating angle of each wheel so that a slip rate and a slip angle are controlled; therefore, driving, braking and steering sub systems of the vehicle are controlled in an integrated manner, function overlap and structural interference are avoided, and the multi-objective optimal controls of vehicle handling stability and energy saving are also realized.

A method of simulating 3-degrees of freedom spacecraft rotational dynamics is provided that includes attaching a payload, using a spherical air bearing, to an inner gimbal of a 3-axis gimbal, where the 3-axis gimbal includes an outer gimbal, a mid-gimbal and the inner gimbal, using a motion controller to control motion of each the gimbal of the 3-axis gimbal, where the motion controller includes an appropriately programmed computer and a motion control motor, sensing limits of free travel of the spherical air bearing, using a position sensor, and changing a position of the 3-axis gimbal away from the limit of free travel of the spherical air bearing when the spherical air bearing approaches the limit of free travel, wherein the position change effects travel of the spherical bearing to be unbounded by the limit of free travel, wherein 4π steradians spacecraft dynamics of the payload are simulated.

The invention discloses a method for detecting the side turnover of a vehicle. The active braking stimulation is applied to left and right wheels (2) and (6) on a wheel axle through brakes (3) and (5) with active braking functions, so as to acquire wheel angular speed and angular acceleration responses of the wheels under the braking stimulation, and the longitudinal acting force, which acts on the wheels, of a road surface is calculated by a wheel rotation kinetic equation. In the condition of presuming that the road surface adhesion of the left and the right wheels is the same and specific, nominal loads on the left and the right wheels are estimated by utilizing a relation among the longitudinal force, a slip rate and a wheel load in a tire model, and the nominal loads approximately have a proportional relation with actual loads on the wheels. Therefore, the transfer rate of a transverse load of the vehicle can be accurately estimated by utilizing the nominal loads, so as to judge the side turnover risk of the vehicle. The method is not influenced by the structural parameter of the vehicle, and the accuracy and the reliability of predicting the side overturn are high.

The invention discloses a distributed electric drive vehicle multi-performance optimization torque distribution method. A MPC controller based on an improved C/GMRES algorithm is adopted to conduct multi-performance optimization torque distribution. The multi-performance optimization torque distribution method comprises the steps that a longitudinal total driving torque and a yawing torque given by an upper controller are used as the torque distribution control input by the MPC controller, tire related information fed back from the vehicle is combined, a model is updated based on the wheel rotation dynamics and the tire slip rate state, the physical characteristics of the output torque of a hub motor are considered, the wheel load rate is taken as the stability constraint precondition, minimizing of the tire slip dissipation energy is taken as the optimization objective, the MPC optimal control problem is established, the improved C/GMRES algorithm is adopted to solve the problem of the torque optimization distribution quickly, and thus the real-time optimal control of vehicle stability and economy is achieved. According to the distributed electric drive vehicle multi-performance optimization torque distribution method, the MPC controller based on the improved C/GMRES algorithm is adopted to conduct multi-performance optimization torque distribution, the tire slip dissipation energy is minimized on the precondition of ensuring the vehicle stability, and the algorithm has high computational efficiency and is suitable for real-time application.

In a load weighing method for a wheel loader, an inclined angle of a ground surface on a slope where the wheel loader is working is detected. A change in a boom angle and a change in a pressure of a boom cylinder are detected while pivoting the boom and an attachment connected to the boom, wherein a load is placed on the attachment. Weight of the load is calculated using the inclined angle of the ground surface, the change in the boom angle and the change in the pressure of the boom cylinder as variables of a rotational dynamic equation for the pivot of the boom.

A guided fluid driven turbine to upgrade the efficiency in converting fluid kinetics into rotation kinetics by having a specific directional guide unit adapted to a fluid driven turbine for the fluid to be guided the open-end, specific directional guide unit extending from its head along the load side of the turbine, thus to change the fluid pressure on the load surface of the turbine.

A vehicle nonlinear dynamics simulation device, such as flight simulator, including a motorized spherical vehicle suspended inside another spherical shell which has smooth inner surface. The spherical vehicle is supported by a plurality of spiky legs of either air-bearing assemblies or omni-directional ball bearing assemblies. The outer spherical shell is supported by three controllable translational motion platforms. Simulating equipment for a pilot cabin is mounted inside the spherical vehicle. The spherical vehicle has driving, restoring, and damping capabilities in roll, pitch, and yaw directions and is capable to rotate 360° in any directions. Therefore it provides a dynamically equivalent model to simulate a vehicle rotational dynamics. The driving and restoring means include Omni wheel assemblies mounted outside of the spherical vehicle and operable to contact the inner surface of the shell to drive the spherical vehicle in roll, pitch, and yaw directions. The driving means include electrical motors. The restoring and damping mechanisms are provided by rotational springs and rotational dampers, respectively. The rotational movements of the spherical vehicle are active and controlled by the driving system and also by the nonlinear dynamics of the spherical vehicle itself, in contrast to the passive movements of the simulation platforms currently used in industries.

A method of generating steam by moving at least a portion of an electrically conductive fluid body along a curved path, passing an electrical current through at least a portion of the fluid body that is moving along the curved path, and vaporizing at least a portion of the fluid body. A steam generating apparatus having a first hydrocyclone configured to promote a rotational kinetic characteristic of a fluid body introduced into the first hydrocyclone and a plurality of electrodes configured to deliver an electrical current to the fluid body. A method of servicing a wellbore by providing a fluid body with rotational kinetic characteristics, passing an electrical current through the fluid body to heat the fluid body, converting liquid of the fluid body to vapor, and delivering the vapor to the wellbore.

Wind turbine rotors are designed by means of computationally intensive algorithms, simulation tools and various models. These art methods, however, have not been successful in relating the blade mass directly to the aerodynamic, rotational dynamics and material parameters. Consequently, modelers are often grappling with discrepancies and ambiguities. Prior art generally constructs the empirical relation M_R∝R^ν where ν is given a value that ranges between 1.8 and 3, depending on who, and how the experimental data is presented and compared with theoretical or simulation results. The present invention derives for the first time a precise scaling law that relates the blade mass to the cubic power of R exactly. It is based on using a novel tool in the form of a set virtual air gear teeth that intermesh with the blade gear teeth, to link the actuator disc to the rotational dynamics and material properties of the blades.

A method for increasing the relaxivity of a contrast agent having a metal ion complexed to a chelator is disclosed. The metal ion complex is tethered to the remainder of the molecule by at least two points of attachment such that local motion is limited and higher relaxivity can be achieved. In one non-limiting example version of the invention, the alanine analogue of Gd(DOTA), Gd(DOTAla) wherein Gd is gadolinium and DOTA is 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid was integrated into polypeptide structures. This resulted in very rigid attachment of the metal ion complex to the peptide backbone. Rigid molecular structures provide fewer degrees of rotational freedom, resulting in greater control over the rotational dynamics and resultant relaxivity. In the case of Gd(DOTAla), the metal complex is tethered to the peptide via the amino acid side chain to the DOTA moiety and via a dative bond from an amide oxygen to the Gd(III) ion.

The invention provides a rigid body rotation dynamics experiment device, and relates to a mechanics experiment device. The problem that in the prior art, a simple rigid body rotation dynamics experiment device is lacked is solved. The experiment device comprises an X-axis, a Y-axis and a Z-axis which are perpendicular to one another, x-axis rotational position is fixed, x-axis is connected with anX frame, the X frame is rotationally connected with a Z frame through a Z shaft; wherein the Z frame rotates in the X frame, the Z frame is rotatably connected with a Y frame through a Y axis, the Yframe rotates in the Z frame, the Y frame is an annular frame, two large mass blocks are arranged on the Y frame in a central symmetry mode, and two small mass blocks are arranged at the Y-axis connecting position of the Y frame in a central symmetry mode. According to the invention, the three-degree-of-freedom rotating device is used for providing a simulation model for the spin dynamics researchof the rigid body, so that the phenomenon of a rigid body spin stabilization intermediate shaft can be clearly observed; the mass block is arranged in a position-adjustable mode, so that the functions of the experimental device are increased.

The invention belongs to a battery in the technical field of rotation dynamics kinetic energy storage and relates to the electro-magnetic induction field. At present, kinetic energy is a kind of performance energy, as the existing kinetic energy on the existing earth can be affected by inhibition friction, nearly no one steps into the kinetic energy storage field, how to store the kinetic energy on the earth becomes the focus of scientific debate, by thinking over the problem, the kinetic energy is not only the energy obtained through high-speed linear motions of objects, the objects also obtain the kinetic energy through rotation of the objects such as earth rotation. According to the battery, the rotation kinetic energy storage technology of the rotation dynamics is fully utilized, based on the magnet mutual repelling principle, a magnet rotor is suspended, then air in cases of an outer mask is totally pumped out for eliminating the friction, then a wire winds around the cases, one object is added to each case, the wire winds around the two cases from the outside of the cases so that wire currents can enter the upper surface and the lower surface of the magnet rotor in the same direction, and therefore electro-magnetic induction is utilized for driving the rotor to rotate. As the interior of the rotor is suspended without the air, the rotor will automatically rotate at a constant speed forever, and electrical energy is converted into the kinetic energy.