7 results about "Rotating unbalance" patented technology

A rotational unbalance amount of a turntable of a machine tool is calculated based on a vibration signal and a rotation signal of the turntable, a rotational unbalance compensation parameter is then calculated based on the rotational unbalance amount, and therefore it is possible to accurately and quickly perform compensation of the rotational unbalance of the turntable of the machine tool. In addition, the rotational unbalance of the turntable is compensated at a time by easily calculating the compensation parameter for at least two positions as well as one position, thereby enabling compensation of the rotational unbalance of the turntable regardless of a structure of the turntable or a position of the workpiece placed on the turntable.

The invention provides a flywheel protection device and a flywheel protection system.The flywheel protection device comprises a protection bearing, and an inner ring of the protection bearing and a flywheel rotor are coaxially assembled in a gapless mode; the protective bearing outer sleeve is arranged on the outer ring of the protective bearing in a sleeving manner and is fixedly connected with the outer ring of the protective bearing; the electromagnetic gap eliminating device is installed outside the protective bearing outer sleeve, a protective air gap exists between the electromagnetic gap eliminating device and the protective bearing outer sleeve, and the electromagnetic gap eliminating device is used for eliminating the protective air gap when receiving the instability signal so that the protective bearing can bear the radial load of the flywheel rotor. And the radial load refers to a force which is generated by the flywheel rotor due to self weight and rotation imbalance and is vertical to the axis direction of the flywheel rotor. According to the invention, the protection air gap is eliminated when the flywheel is in an unstable state, and the protection bearing is used for bearing, so that equipment damage is avoided.

This invention discloses a method for predicting the rotational imbalance of bladed disk components, comprising: Step 1: obtaining the volume and centroid radius of the thickened geometry of the blade; Step 2: calculating the imbalance sensitivity coefficient; Step 3: obtaining the contour lines of multiple detection sections along the blade height direction, and discretizing each contour line into several small line segments; Step 4: calculating the theoretical area and theoretical perimeter of each detection section of the theoretical blade; Step 5: obtaining the actual area of ​​each detection section of each processed blade; Step 6: calculating the thickness deviation of each detection section of each processed blade; Step 7: calculating the average thickness of the entire blade, thereby obtaining the overall imbalance of the bladed disk. This invention, based on existing measurement data from the production site, can quickly and accurately predict the rotational imbalance of bladed disk components, thus solving the problems of long cycle time, high cost, low accuracy, and poor adaptability to the production site in existing technologies.

The utility model discloses a lightweight low rotational inertia steel wire rope carrier roller device, which comprises a shaft, a bearing and a carrier roller body, the bearing is arranged on the shaft, the carrier roller body is arranged on the bearing, the carrier roller body comprises a fixing part, a connecting part and a lifting part, the lifting part is connected with the fixing part through the connecting part, and the cross section of the carrier roller body is I-shaped. The device is simple in structure and easy to process and maintain. Through the lightweight treatment of the whole structure, the mass and the rotational inertia are reduced, the carrier roller main body can respond to the movement change of the steel wire rope more quickly and start to rotate or stop more quickly, and the abrasion to the steel wire rope is reduced; the carrier roller with low rotational inertia is easier to accelerate, so that the energy required for starting and maintaining the rotation of the carrier roller is less, the vibration caused by unbalanced rotation can be reduced, the energy consumption of the whole system is reduced, the noise is reduced, and the stability of the system is improved.

The invention belongs to the technical field of satellite attitude control, and relates to a large-scale satellite robust attitude stabilization method for rotation imbalance disturbance, which comprises the following steps: constructing a rotation imbalance and rigid-flexible coupling dynamic model of a large-scale satellite; a sliding mode observer is adopted to estimate periodic and pulsed unbalanced disturbance; a satellite wide-frequency-band attitude is determined through fusion of a magnetofluid angular velocity sensor and a traditional attitude sensor; an integral sliding mode controller is adopted to suppress unbalanced disturbance and realize global attitude stability of the large satellite; according to the method, high-precision estimation of periodic and pulsed unbalanced moments is realized, and the attitude determination capability under a wide frequency band condition is remarkably improved; compared with a traditional method, the precision and stability of attitude control are obviously improved, and the performance is obviously improved.

The utility model discloses a wheel hub mechanism of a high-speed rail geometric state detector trolley, relates to the field of rail traffic detection equipment, and can solve the problems that the wheel hub mechanism of an existing detector trolley is prone to rotating unbalance, axis deviation and axial movement in the high-speed running process of a detector. Through the design that the angular contact bearing and the wheel ring part are matched with the rolling wheel, the unbalance in the rotating process of the hub can be effectively reduced, and the connecting shaft part, the angular contact bearing and other precise accessories are adopted, so that the axis deviation is reduced. And under the precise matching of the bearing and the connecting shaft, the axle center of the hub can be kept stable in the whole working process, so that the conditions of poor contact and instability between the hub and a rail caused by axle center deviation in the prior art are avoided. In addition, a fourth bolt and a second bolt are fixed in a fastening mode, axial movement is effectively prevented, and accurate control over the position of the hub is ensured.