72results about How to "Avoid shock phenomenon" patented technology

The invention discloses a servo system self-adaptive robust controller with dynamic frictional compensation, which is used for improving output tracking precision and fast response of a motor servo system and is particularly suitable for a precise motor servo system with requirements on high precision and fast response. The servo system self-adaptive robust controller comprises a parameter self-adaptive adjusting module, a dynamic frictional compensator and a robust control module. The online estimation of a frictional force value is realized by adopting a frictional model approximator constructed by a LuGre dynamic frictional model Lipschitz coefficient through self-adaptive adjustment of a parameter of the frictional approximator, and accordingly, the frictional compensation is carried out for overcoming the adverse effect of frictional force on the output tracking precision and the fast response of the servo system. The controller adopts a robust control law and ensures that the servo system has enough disturbance resistance. Because the controller can realize rapid and accurate frictional compensation and effectively inhibit the influence of external disturbance, the output tracking precision and the fast response of the servo system can be greatly improved.

The invention discloses a method for optimizing wavelength path dispersion compensation and a device thereof comprising: arranging an adjustable dispersion compensation unit before a light receiver for compensating the dispersion of a single wavelength path; adjusting the dispersion compensation value in a specified dispersion compensation adjustable range; respectively detecting a forward error rate of a forward error correction corresponding to different dispersion compensation values; searching the minimal value of the forward error rate of the forward error correction. The corresponding dispersion compensation value to the minimal value of the forward error rate is the optimum dispersion compensation. The method of the invention optimizes the dispersion compensation of the wavelength path based on the forward error rate of the forward error correction, obtains the optimum dispersion compensation and realizes the optimum dispersion compensation effect. The software implementation of the invention is easy, the shock phenomenon caused by frequently adjusting dispersion compensation value is avoided, and the device of the invention is suitable for popularization and application of the optical communication technique field relevant enterprises.

The invention discloses an exposure parameter adjusting method, device and readable medium, and belong to the technical field of the image processing. The method provided by the invention comprises the following steps: acquiring an exposure evaluation value of the current frame image, and determining an exposure state of the current frame image according to the exposure evaluation value; acquiringthe exposure state of the former frame image, the exposure parameter adjusted based on the exposure state of the former frame image, and an adjusting direction; determining the exposure parameter adjusting type according to the exposure state of the current frame image and the exposure state of the former frame image; and adjusting the current exposure parameter according to the exposure parameter adjusting type, the exposure parameter adjusted based on the exposure state of the former frame image, and the adjusting direction. The current exposure parameter is adjusted by using the above method, the oscillation phenomenon is effectively prevented in comparison with the way of adjusting the exposure parameter only through the exposure state of the current frame image in the prior art, andthe image quality is further guaranteed at the same time.

The invention provides a virtual outlier noise reduction method of micro-inertial device signals, which comprises the following steps: (1) for continuous signals with noise, intercepting fixed-length data quantity to be recorded as a sequence A; (2) carrying out symmetric extension on the sequence A to finish wavelet decomposition; (3) averaging wavelet functions after sequence decomposition, and computing signal variance; (4) computing the outlier, and eliminating a threshold; (5) carrying out noise reduction treatment on the wavelet functions by utilizing the computed threshold T; (6) repeating step (2) to step (5) until the number of the decomposed layers reaches the set value; (7) finishing reconstruction of the signals by utilizing the treated wavelet functions, and realizing noise reduction treatment on the signals at the intercepted section; and (8) repeating step (1) to step (7) to realize continuous noise reduction of the signals. When filtering the measured signals of a micro-mechanical gyroscope with the outlier and noise by aopting the method of the invention, oscillation near an outlier point is reduced, and a signal-to-noise ratio which is higher than that acquired by the universal threshold noise reduction method can be acquired.

The invention discloses a stably placed oxygen bottle for emergency medical aid and relates to the technical field of medical instruments. The stably placed oxygen bottle comprises a base; two symmetrical universal wheels are fixedly connected with the bottom of the base; an oxygen bottle main body is placed above the base; a first groove which is matched with the oxygen bottle main body is formedon the middle part of the upper surface of the base; the bottom end of the oxygen bottle main body is inserted into the first groove; two symmetrical support rods are fixedly connected with the uppersurface of the base; the two support rods are respectively located on the two sides of the groove. In the stably placed oxygen bottle for emergency medical aid, positive and negative rotating motorsare arranged for driving loop coils to drive idler wheels to press movable plates so as to drive supporting legs to move downward under the action of screw rods, so that the universal wheels are prevented from touching the ground and the device is supported by supporting legs to stably stand. Under the action of first springs, the oxygen bottle main body is clamped by arc-shaped splints, so that the oxygen bottle main body is prevented from shaking or falling.

The invention discloses a polycrystalline diamond (PCD) super-finish reamer, which comprises a reamer body and a blade, wherein the reamer body is connected with the blade by welding; the front part of the blade is a hard alloy rough reaming blade; the middle part of the blade is a PCD finish reaming blade; and the back part of the PCD finish reaming blade is provided with a PCD shock-proof blade. Due to the adoption of the PCD super-finish reamer with the structure, shock phenomenon in the processing process is avoided, processing accuracy is enhanced and the service life of the reamer is prolonged.

The invention provides a method for building an in-orbit X-ray pulsar timing model. According to the method for building the in-orbit X-ray pulsar timing model, the problem of data introduced by weak X-ray signal intensity and strong observation platform dynamic condition is effectively solved by organically combining various calculation methods of X-ray pulsar photon arrival time preprocessing, high-precision pulsar autorotation frequency calculation, timing model initial value interval estimation, observation pulse profile reconstruction, high-precision pulse arrival time estimation and robust timing model estimation, ephemeris information such as high-precision pulsar position and time required by X-ray pulsar navigation can be provided, and accurate navigation is realized. The method is suitable for autonomous operation and control of orbiting satellites or constellation of the earth or other planets.

The invention discloses a polishing device for railway transportation equipment. The polishing device comprises a base plate, vertical plates are fixedly connected to the two sides of the upper surface of the base plate, sliding grooves are formed in the opposite sides of the two vertical plates, the tops and the bottoms of the inner walls of the sliding grooves are connected through sliding rods,sliding blocks are arranged in the sliding grooves and connected to the sliding rods in a sleeving manner in a sliding connection mode, the portions, located below the sliding blocks, of the slidingrods are sleeved with damping springs, the two ends of the damping springs are fixedly connected with the bottoms of the inner walls of the sliding grooves and the bottoms of the sliding blocks, and the opposite sides of the two sliding blocks are connected through a carrying plate. According to the polishing device, the damping springs are improved, when a push plate is pressed downwards, the sliding blocks can downwards slide on sliding rods inserted into the sliding grooves, the damping springs can be compressed, when a grinding disc touches the equipment, generated vibration can be transmitted to the damping springs through damping blocks, the too serious vibration phenomenon of the carrying plate can be avoided; and at the time, the protection capacity of the equipment and workers canbe improved.

The invention discloses a semi-active vibration absorber control system based on state observation. The semi-active vibration absorber control system is characterized by being composed of a semi-active suspension system, a state observation module, a phase difference cosine value calculation module and a current output module. The semi-active suspension system comprises a vibration reducing object, a semi-active vibration absorber, a passive vibration isolator and a sensor mounted on the vibration reducing object or the semi-active vibration absorber, and is used for detecting vibration information corresponding to the output vector of the semi-active suspension system in real time. The state observation module comprises an analog-digital converter, a self-adaption state observer and a state processing unit, and is used for predicting related vibration information corresponding to the related state vector of the semi-active suspension system in real time. The current output module is composed of a fuzzy logic control unit, an integrator and a controlled current source, and is used for outputting control current needed by the semi-active vibration absorber in real time. The semi-active vibration absorber control system can control vibration of a semi-active vibration absorber system fast, stably and effectively only through one sensor.

The improved artificial fish swarm algorithm is creatively combined with an unmanned aerial vehicle cluster, and rapid and efficient positioning of a gas leakage source is achieved. A traditional fixed monitoring network method has limitation and is difficult to meet the positioning requirement of an existing positioning gas leakage source, a system with multiple unmanned aerial vehicle clusters has the advantages of maneuverability, flexibility, wide monitoring range and the like, the defects of an existing fixed monitoring station can be overcome by using the system as an environment monitoring platform, and active tracking and positioning of the harmful gas leakage source are facilitated. According to the smoke plume search strategy, an improved artificial fish swarm algorithm is adopted, a curiosity model is introduced on the basis of the standard artificial fish swarm algorithm, the search visual field and the moving step length of the unmanned aerial vehicle can be adjusted in aself-adaptive mode, and algorithm defects caused by the fact that the visual field and the step length are constant values in the standard artificial fish swarm algorithm are avoided.

The invention discloses a motor winding temperature estimation and protection method. The method comprises the following steps: S1, obtaining a BP neural network heat dissipation model of a motor winding; S2, calculating the temperature of a motor winding; S3, protecting a motor winding. Due to the fact that the neural network can conduct accurate modeling on the heat dissipation process under thecomplex heat dissipation condition, the method is more suitable for application scenes with the complex heat dissipation condition; a winding heating temperature change rate caused by loss is calculated by using the motor winding current; the winding temperature is calculated according to the winding heat dissipation temperature change rate and the winding heating temperature change rate; the calculated winding temperature is used to limit motion control output of the motor by using a multi-segment temperature cut-off curve so as to carry out temperature protection on the winding and preventdamage caused by overhigh temperature of the winding.

The invention discloses a visual experiment system for a liquid phase pipeline of a low-temperature container differential pressure type liquid level meter. The system comprises a transparent outer cover, an inner tank, a bottom plate, an overpressure discharge pipeline, a pressure pipeline, a full-measuring pipeline, a filling pipeline and more than one liquid phase pipeline of the liquid level meter, a liquid phase heating device used for heating the liquid phase pipeline of the liquid level meter and a vacuum unit; the inner tank is arranged above the bottom plate at intervals; the transparent outer cover covers the outer side of the inner tank 2, and a vacuum chamber is formed in the space between the transparent outer cover and the bottom plate; the vacuum chamber is communicated withthe vacuum unit; the overpressure discharge pipeline, the pressure pipeline, the full-measuring pipeline, the filling pipeline and the liquid phase pipeline of the liquid level meter are sequentiallycommunicated from top to bottom and are arranged in the inner tank; and a transparent pipeline section is arranged on one side, close to the inner tank, of the liquid phase pipeline of the liquid level meter. According to the visual experiment system, the gas-liquid interface of the transparent pipe section arranged close to the inner tank is checked through the transparent outer cover, so that the design and optimization of the liquid-phase pipeline of the liquid level meter are realized.

A follow-up device of a coal mine fully-mechanized coal winning machine belt support is characterized in that: the number of upper supports is two, both ends of an i-steel support beam (1) are fixed on two upper ends of the two upper supports, lower ends of the upper supports are provided with a connecting plate (5), the lower part of the connecting plate (5) is connected with the middle part of a shaft (7) through a damping mechanism, both ends of the shaft (7) are fixedly connected with the middle part of two fender plates (8), a follow-up of a wheel (9)-formed support is respectively arranged between two ends of each fender plate (8), and automatic adjustment shock absorption of the support is formed by the shaft (7), a damping mechanism and two wheels (9). The upper support body is manufactured by i-steel, a strong and stable support structure is formed, the damping mechanism effectively prevents the vibration phenomenon at rail joints during marching of the machine, and through the follow-up of the wheel (9)-formed support between the two fender plates, safety production of fully-mechanized coal winning machine belt support is improved.

The invention discloses a construction ground punching device and method. The device comprises a fixed base, a rotating platform and a punching mechanism. Supporting legs are mounted on the bottom ofthe fixed base, lifting type rollers are mounted on the supporting legs, the rotating platform is fixedly mounted on the fixed base, a supporting stand column is arranged in the middle of the upper end face of the rotating platform, a cross beam is vertically mounted on the top of the supporting stand column, a transverse sliding rail is mounted on the lower end face of the cross beam, a fixed plate assembly is mounted below the transverse sliding rail, a first oil cylinder mounting base and a second oil cylinder mounting base are in sliding connection to the transverse sliding rail, a first oil cylinder and a second oil cylinder are mounted between the first oil cylinder mounting base and the fixed plate assembly and between the second oil cylinder mounting base and the fixed plate assembly correspondingly, and the punching mechanism is mounted below the fixed plate assembly. The construction ground punching device is novel in structural design, rapid punching of a construction groundcan be achieved, meanwhile, the punching interval can be adjusted, different positions are punched, punching stability is good, and the work efficiency can be effectively improved.

The invention discloses a processing method and a processing device for VRRP message; the method comprises the following steps: the access device confirms the role type of the interface while receiving the VRRP message; if the role type is the main machine interface, the access device discards the VRRP message; if the role type is the router interface of the VRRP backup set, the access device transmits the VRRP message; if the role type is the interface to be verified, the access device judges whether the VRRP message meets the specification; if the VRRP message meets the specification, the access device transmits the VRRP message; if the VRRP message does not meet the specification, the access device discards the VRRP message. According to the environment, the oscillation phenomena of the VRRP backup set and the host cut-out phenomena can be avoided.

The invention provides a device for activating PGRG microorganisms by utilizing solar energy for floating. The device comprises an illumination chamber, wherein light-gathering baffle plates are arranged on the left side and the right side of the illumination chamber; an installation component is fixedly arranged at the upper side of the illumination chamber; a driving assembly is arranged inside the installation component; the driving assembly comprises driving mechanisms; a driving threaded rod is arranged between the driving mechanisms; and the upper side of the driving threaded rod is connected with a movable tooth piece in an engaged mode. According to the device for activating the PGRG microorganisms by utilizing the solar energy for floating, sunlight is effectively absorbed through the arrangement of a solar panel; in addition, the position of the sun moves, so that the top end of the movable connecting rod is used to drive a sunlight absorption assembly to slowly slide on a fixed sliding rod; and when a photoresistance member senses the sunlight illumination, the sunlight absorption assembly is enabled to stop moving, the solar panel is used for continuously absorbing the sunlight, the light receiving time of the solar panel is further prolonged, and meanwhile, the utilization rate of the sunlight is increased.