51 results about "Mass centre" patented technology

A wheel for vehicles includes a rim, a tyre mounted on the rim, and at least one device for energy generation operatively associated with the tyre. The device for energy generation includes a first element that is fixed relative to the rim or to the tyre, and a second element mounted on the first element and free to rotate relative to the first element around a predetermined rotation axis. The second element has a mass centre eccentric to the predetermined rotation axis. The device for energy generation further includes an electric generator having a stator mounted on the first element and a rotor mounted on the second element.

The invention provides a fiber optic acceleration and pressure sensor dispensing with other structures, in particular relates to a fiber optic Fabry-perot acceleration and pressure sensor which comprises optic fibers and connected optic fibers, wherein microflutes are formed on the end faces of the optic fibers, projections are formed on the connected optic fibers, and the optic fibers and the connected optic fibers are connected through butted joint to form a fabry-perot chamber and membranes; and besides, the optical reflecting surface of the fabry-perot chamber is a plane. The sensor does not need to be matched with other structures; when the sensor senses the external accelerated speed and pressure, the length of the fabry-perot chamber can be changed, and the corresponding measurement amount can be obtained by measuring the change of the length of the chamber; and besides, as the optical reflecting surface of the sensor is a plane, the sensor has favorable optical performance. The invention can be used as the acceleration and pressure sensor, and the measurement range thereof can be changed by changing the thickness or the shape of each membrane and the length or the weight of the hard mass centre.

The present invention discloses a method and apparatus for identifying inertial parameters of an object to be identified. The method includes the steps as follows: measuring the angular momentum of various arm sections of a mechanical arm and the angular momentum of a spacecraft at a plurality of points in time that the mechanical arm is driven to rotate for grabbing the object to be identified; generating the mass and mass center position of the object to be identified, and calculating out a plurality of inertia moments of the object to be identified by utilizing the several groups of angular momentum and the current generated mass and mass center position of the object to be identified according to a preset kinetic model; evaluating the current inertia moment error of the object to be identified according to the current acquired inertia moments, returning to the generating and calculating processes when the error does not accord with a preset error requirement, and otherwise, employing the current calculated out inertia moment, the current generated mass and mass centre of the object to be identified as the inertia moment, the mass and mass centre position of the object to be identified. According to the invention, the valuable fuel of the spacecraft is saved, the inertial parameter identification precision of the object to be identified is improved, and the ideal general purpose is provided.

The invention discloses an automotive stability control real vehicle testing system. The testing system is composed of three parts of a traction rod component, a transverse swing link component and a vehicle component. The two ends of the traction rod are respectively connected with a fixed shaft and the transverse swing link by pin shafts, a five-wheeled instrument is mounted on the transverse swing link so as to support the transverse swing link, the tension rods of a front wheel and a rear wheel are respectively connected to the transverse swing link and a vehicle clamping device by pin shafts, and the vehicle clamping device is fixedly connected to the vehicle. The relative motion relationship among the traction rod component, the transverse swing link component and the vehicle component is determined according to the angular displacement sensors between the traction rod and the transverse swing link and among the tension rods of the front wheel and the rear wheel and the transverse swing link and by the measurement parameter of the linear displacement sensor of the tension rod of the front wheel; the mass centre of the vehicle and the slip angle of each wheel can be measured by the front wheel steering angle measured by a vehicle running stability control system; the stress relationship among the traction rod component, the transverse swing link component and the vehicle component is determined according to the measurement parameters of the tension gauges of the front and rear wheels; and the effect for controlling the whole vehicle motion can be obtained by adjusting the side force of the whole vehicle, the transverse swing link torque and the tyre ground acting force through the whole vehicle centrifugal force measured by the vehicle running stability control system. All sensors are connected to a signal collecting system for collecting and storing signals. The tyre ground acting force is adjusted by a control system.

The invention discloses a gravity center testing system for a drilling platform and a testing method thereof. The testing system comprises a power supply source, a plurality of parallel and autonomous working hydraulic drive mechanisms for synchronously jacking and lowering a drilling platform to be tested in parallel, a plurality of pressure sensors for respectively detecting bearing pressures of a plurality of hydraulic drive mechanisms in real time, displacement sensors for respectively detecting jacking displacement or lowering displacement of a plurality of hydraulic drive mechanisms in real time, and a control system for analyzing to obtain barycentric coordinates of the drilling platform. Signals detected by the pressure sensors and the displacement sensors are sent to the control system via an A/D conversion circuit, and the control system controls dynamic mechanisms of a plurality of hydraulic drive mechanisms. The testing method comprises steps of preparing, zero setting, synchronously jacking and weighing, as well as synchronously lowering and testing the gravity center. The gravity center testing system has reasonable structure and simple testing method, is convenient to be realized with high test precision, and can effectively solve the problems in drilling platform gravity center testing.

The invention discloses a motion detecting method, a motion detecting device and a computer readable storage medium, which are applied to the field of smart cities. The method comprises the followingsteps: measuring first motion parameters of a robot, wherein the first motion parameters comprise linear speed and angular speed, and the linear speed is linear speed of a mass centre of the robot; utilizing the first motion parameters to calculate second motion parameters of the robot, wherein the second motion parameters comprise linear speed of a left front wheel of the robot and linear speed of a right front wheel of the robot; separately comparing the first motion parameters and the second motion parameters with a corresponding threshold range; and if any one of the first motion parameters and the second motion parameters is not within the corresponding threshold range, prompting first caution information. Multiple motion parameters of the robot are obtained by direct measurement andcalculation for judging whether the robot is in an abnormal motion state or not according to a condition whether any motion parameter of the robot is within the threshold range or not.

A method for identifying a selected playing ball from a prescribed number of playing balls, wherein each of the playing balls is provided with a different symbol, wherein: a) the selected playing ball is moved from a starting position past an image recording unit pickup, b) the mass centre of the depiction of the selected playing ball in the image is kept unaltered for a prescribed, c) the image position and size of the depiction of the playing ball is ascertained, and a check is performed to determine whether portions of the depiction of the playing ball are situated outside a lateral of the image, and d) if portions of the depiction of the playing ball are situated outside said lateral edge, the playing ball is returned to the pickup area of the image recording unit and/or is repositioned and steps b) to d) are repeated.

A road lamp heat radiation outer casing comprises a lamp body supporting base for mounting the road lamp on the lamp post and a lamp body base for connecting the lamp body supporting base. The lower surface of the lamp body base is provided with at least one downwardly-extending radiating fin, and the distance from the resultant mass centre of all the radiating fins to a first end surface of the lamp body base is smaller than the distance from the resultant mass centre of all the radiating fins to a second end surface of the lamp body base. Adopting such design, the whole lamp body volume is less, the weight is lightened, the installation is convenient, the mass center of the lamp body moves backward, the applied force at the connection point of the lamp body supporting base and the lamp body base is reduced, and the applied force point is transferred, thereby leading the product to be more fixed.

A method for calculating the error of centralization of a radioactive source is provided, which is based on finite element analysis software. The method is characterized in that the method comprises the following steps: A) calculating the weight and the mass centre of a treatment head, and transferring the weight and the mass center to the mount position of the treatment head according to the mechanical equivalence principle; B) designing a cover needle as a representative of the treatment head, which structurally comprises a top cover and a needle connected with the center of the top cover, wherein the top cover is positioned at the site of the treatment head and the needle tip is positioned at the center of a roller to represent the focus point of a radioactive source, the mass of the cover needle is negligible, and the deformation of the cover needle is negligible for the rigidity of the cover needle is extremely large; C) configuring parameters and limits required by finite element analysis according to the material physical parameters of the roller; and D) calculating the stress and the displacement of components of the roller by using the finite element analysis software, wherein the calculated displacement value of the needle tip of the cover needle is the error value of centralization of the radioactive source. The invention can relatively accurately calculate the error of centralization of the radioactive source during the design step, optimize the structural design, increase the design accuracy, and reduce consumption of time and cost.

The invention provides a crankshaft rotor assembly and a compressor. The crankshaft rotor assembly comprises a crankshaft and a rotor; the crankshaft comprises a rotating axis, a crankshaft main bodyand a main eccentric part; the main eccentric part can be connected to the outer peripheral surface of the crankshaft main body; an eccentricity r3 exists between the mass centre of the main eccentricpart and the rotating axis in the radial direction; the rotor is provided with a central shaft hole for the crankshaft to penetrate through and comprises a main accommodating groove which is formed in the radial direction from the central shaft hole; and the position of the main accommodating groove corresponds to that of the main eccentric part, so that the main eccentric part is inserted into the main accommodating groove, and the main eccentric part is allowed to rotate in the main accommodating groove. Through the crankshaft rotor assembly, the main eccentric part which achieves a balancing effect is positioned in the rotor, so that the noises caused by shocking a main balancing block by the gas which is exhausted from exhaust holes in a silencer can be effectively reduced; the problems that the main balancing block is over-high and the increment of the noises caused by shocking the main balancing block by the gas which is exhausted from the silencer are solved; the cost can alsobe reduced; hidden danger of breakage of a balancing block is reduced; the problem about interference is solved; and the universality is improved.

The invention relates to the mast-hydraulic cylinder construction (4, 5) of a two or multiple-stage forklift mast. The substantially vertical beams (4, 5) and cylinder liners (6) of the solid mast structure form an integrated structure (4, 5), in which the cylinder liners (6) consist of ducts integrated within the beams (4, 5), with the mass centre of the cross-section of the integrated structures being at the centre of the cylinder liner (6) or in its immediate vicinity so that the integrated structure (4, 5) can be manufactured by heat extrusion or cold drawing, and in that the integrated structure (4, 5) comprises a first protrusion (14), whose surface is a bearing surface (17) for a roller bearing (16), and a second protrusion (15) for providing a mass centre at the centre of the cylinder liner (6), and a support surface (18, 19) substantially transverse to the direction of movement of the forklift. The invention also relates to a method for producing an integrated structure (4, 5).

The invention discloses a structure for reducing the equivalent unsprung weight of a wheel-rim electrically-driven system of a single oblique arm type suspension, which is characterized in that an elastic rubber hinge is supported on a frame, one end of a swing arm of the single oblique arm type suspension is connected with the elastic rubber hinge, and the other end of the swing arm is connected with a motor fixed on a reducer casing; the reducer casing is connected with a sleeve of a half axle; the power output end of the motor is connected with a small gear, then the small gear is meshed with a large gear, and the large gear is connected with the sleeve of the half axle; and after the gear reducing is performed, the power is outputted to a rim by the half axle so as to drive wheels. The equivalent unsprung weight is reduced by reducing the distance between the mass centre of non-concentric parts of a wheel and a central swing axis of the single oblique arm type suspension. The structure disclosed by the invention has the advantages of reducing the equivalent unsprung weight of the wheel-rim electrically-driven system, increasing the vibration frequency of wheels, reducing the resonance, reducing the impact and vibration from road surfaces, and improving the running smoothness of vehicles.