43results about How to "Avoid excitation" patented technology

The invention relates to a model reference self-adaptive sliding mode control method for a vertical takeoff and landing reusable launch vehicle, and belongs to the technical field of aircraft control.A self-adaptive sliding mode reaching law with fixed convergence characteristics and a second-order fixed-time convergence extension state observer are introduced into the design of a model referenceself-adaptive sliding mode controller, the capability of a system for suppressing complex external interference is improved accordingly, and meanwhile the precision and tracking speed of model tracking are increased.

The invention discloses a turbocharger integral type bearing with a locating mechanism. The turbocharger integral type bearing with the locating mechanism comprises an integral type bearing body with an oil hole and the locating mechanism matched with the integral type bearing, wherein a shaft shoulder is arranged at the end, facing the locating mechanism, of the integral type bearing, and a notch is formed in the shaft shoulder; the locating mechanism comprises a locating pin matched with the notch, an anti-thrust press plate used for limiting the integral type bearing to move in the transverse direction and an oil sealing cover arranged outside the anti-thrust press plate. The turbocharger integral type bearing with the locating mechanism is simple in structure, the length of the rotor system is short, the mass is small, compared with a traditional turbocharger, the mechanism efficiency is improved by 3%-5% by average, and the low velocity section is improved by 8%-10%; the turbocharger integral type bearing with the locating mechanism is provided with an axial oil groove and capable of adjusting and balancing bearing oil feeding and returning flow, so that the stimulation of oil film whirl in the rotor system is restrained fundamentally, the vibration is controlled, the noise of the turbocharger is reduced, and the work stability is improved; meanwhile, the oil-bearing effect is achieved, under the condition of short oil insufficiency, the replenishing lubricating effect is achieved, it is guaranteed that the normal work state of the turbocharger is maintained, and the service life is prolonged.

An exemplary system includes a first electric motor and a second electric motor, which are coupled mechanically to one another via a common string of the system. The string has a torsional natural oscillation at a natural frequency. A first oscillating torque acts on the string by the first electric motor and a second oscillating torque acts on the string by the second electric motor. The second electric motor is arranged with respect to the first electric motor such that the effect of the second oscillating torque on the string results in damping of the excitation of the natural oscillation owing to the first oscillating torque.

Disclosed is a pass band type acoustic wave filter capable of obtaining an excellent attenuation characteristic in attenuation bands, in which an IDT electrode having a meander structure is used as at least one of the input-side electrode and the output-side electrode, and the attenuation band is provided over/under the pass band. An electrode having a meander structure in which a plurality of IDT blocks are connected to each other in series between the input port or the output port and the ground port is arranged as the input-side IDT electrode and the output-side IDT electrode, and the electrode finger between the neighboring IDT blocks is removed, so as to suppress excitation of an undesired acoustic wave.

The invention discloses a display screen, an electronic device and a manufacturing method of the display screen. The display screen comprises an organic light-emitting layer, a TFT circuit layer, a polarizer and an infrared sensor, wherein the TFT circuit layer is arranged below the organic light-emitting layer, and the TFT circuit layer is used for driving the organic light-emitting layer to emitlight to be displayed; the polarizer is arranged above the organic light-emitting layer; the infrared sensor is arranged above the polarizer, and is used for transmitting and/or receiving infrared light. The invention also discloses an electronic device and a manufacturing method of the display screen. According to the display screen, the electronic device and the manufacturing method of the display screen, the infrared sensor can be arranged on the polarizer under the condition of a full screen, so that the phenomenon of screen flicker caused by the fact that the infrared sensor is arrangedbelow the TFT circuit layer can be avoided.

A fan assembly includes a vibration damping system (12) to reduce induced vibrational energy generated as a result of fan motor (26) operation. The vibration damping system (12) includes a plurality of arms (100) and damping material (102). The vibration damping system arms extend between a fan motor and a shroud assembly disposed circumferentially outward from the fan motor housing. The damping material (102) is attached to an end of each of the vibration damping system arms (100) and connects each arm to the shroud assembly. The damping material (102) absorbs induced vibrational energy generated by fan motor operation.

The invention relates to a traveling wave photoelectric detector integrated with polarization coupling processing. The traveling wave photoelectric detector at least comprises one component unit. Each component unit comprises a radio-frequency transmission line, optical detection units arranged at the two sides of the radio-frequency transmission line respectively, two passive optical waveguides, a pair of ends of which are mutually connected, and a passive two-dimensional grating arranged at the joint of the two passive optical waveguides, wherein the radio-frequency transmission line is connected with the output ends of the optical detection units; and the two passive optical waveguides are used for providing optical signals for the optical detection units arranged at the two sides of the radio-frequency transmission line.

The invention provides an optical fiber femtosecond laser mode locking device based on a semiconductor saturable absorber mirror. The air gap between the semiconductor saturable absorber mirror in thefiber laser and the end face of the ferrule of the ferrule-type fiber connector is filled with the refractive index matching liquid, so that the problem that the operation of the laser is interfereddue to the fact that the air gap forms a sub-cavity is solved, and the mode locking stability of the fiber femtosecond laser is effectively improved.

The invention provides a wearable non-invasive phototherapy device which comprises a photodynamic module which comprises at least one active light-emitting unit and is used for radiating a photon beam and providing initial photodynamic force for the phototherapy device, the at least one active light-emitting unit is one or more of a light-emitting diode, an organic light-emitting diode, a super-radiation diode and a semiconductor laser; and the driving display module is used for controlling, displaying and recording the working state of the photodynamic module. According to the wearable noninvasive phototherapy device disclosed by the invention, the active light-emitting unit is combined with the fluorescence conversion material, so that the spectral component of the incident photon beam of the active light-emitting unit is adjusted and changed. The device is simple and reasonable in structure, wide in application range and good in wearing comfort and portability.