109results about How to "Solve the shock" patented technology

The invention discloses a network failure processing method and device. A distributed storage system comprises a service network and a storage network which are deployed separately, a monitor (MON) and multiple object storage devices (OSD) are connected to the service network to achieve communication, and the OSDs are further connected to the storage network to achieve communication. The method isapplied to the OSDs and comprises the steps that a storage network connection link between one OSD and the OSD matched with the OSD is detected to obtain link state information of the OSD side; and if it is detected that the link state of the OSD side is abnormal, the daemon process of the OSD is terminated actively, and the OSD is prevented from sending failure information of the OSD matched with the OSD to the MON through the service network. The network failure processing method is applied to the OSDs in the storage system, when one OSD detects that the link state of the OSD side is abnormal, the OSD terminates the daemon process of the OSD and is prevented from falsely reporting failures of the other OSDs, and therefore the OSD shock problem in the storage network is solved.

The invention discloses equipment for testing high-speed tensile stress and strain of a material. The equipment comprises a test sample, a high-speed tensile testing machine, a strain gauge, a light source, a high-speed camera and a controller, wherein the test sample is shaped like a dumbbell, the middle part thereof is a parallel section, the lower part thereof is an elastic section, and the parallel section is sprayed with speckles; the high-speed tensile testing machine is used for stretching the test sample; the strain gauge is stuck on the elastic section of the test sample; a strain meter is used for receiving data transmitted from the strain gauge; the light source is used for aligning a test part of the test sample so as to make the speckles sprayed on the surface of the test sample clearly visible; the high-speed camera is used for aligning the parallel section of the test sample; the controller is used for receiving data transmitted from the high-speed tensile testing machine, the high-speed camera and the strain meter, and drawing a stress-strain curve of the test sample. The invention further provides a method for testing the high-speed tensile stress and strain of thematerial. Through the equipment and the method, the problem of oscillation of the stress-strain curve of the material under a high strain rate can be effectively solved, so that a test result becomesaccurate.

The invention provides a hard disc device, comprising a magnetic head and a disc body, wherein the magnetic head and the disc body are provided with low-friction atomic scale smooth surfaces; and each low-friction atomic scale smooth surface comprises monolayer graphene, molybdenium disulfide, bismuth, molybdenum, mica and the like. Vander wale force between the low-friction atomic scale smooth surfaces is used as soft support, thus greatly reducing the distance of the magnetic head and the disc body, correspondingly improving the storage density of a magnetic disc, and being capable of realizing contact reading and writing to a hard disc. Simultaneously, due to the extreme low friction coefficient between the atomic scale smooth surfaces, the extreme high rotating speed can be easily realized, so the reading and writing speed of data of the hard disc can be improved. In addition, the hard disc device can well solve the defects of the traditional hard disc in the aspects of high-low temperature resistance, vibration resistance, shock resistance and the like, and greatly improves the stability of the hard disc.

The invention provides a method and apparatus for suppressing neighbor oscillation. The method comprises the following steps: a first router obtains a neighbor state change dynamic state between a second router which establishes a neighbor relationship with the first router; the first router adds one to a neighbor penalty value when the neighbor state change dynamic state is changed from a normal state to a fault state each time; when the increased neighbor penalty value is greater than a preset suppression threshold value, the first router sets the neighbor relationship as a suppression state. The method and apparatus solve a problem that an unstable neighbor state causes routing oscillation of a local routing table in the prior art so as to achieve an effect of saving valuable bandwidth resources and CPU resources.

The invention provides a load balance CTP (Collection Tree Protocol) routing protocol based on data transmission applicable to wireless sensor networks. The protocol compromises between the energy consumption of nodes in a wireless sensor network, and the high efficiency and reliability of data transmission, as well as the balance of node energy consumption of nodes on the same level of a routing tree of a topological structure in the wireless sensor network. Through considering data amount forwarded to a candidate father node when a father node is selected as the node in the wireless sensor network, forwarded data of nodes on the same level of the topological structure tree in the wireless sensor network is balanced; therefore, while the overall performance optimization of the network ensured, the survival time of the network is effectively prolonged, the energy efficiency of the network is improved, the problem of network oscillation of the wireless sensor network is solved, and the performance of high data delivery rate and high data transmission efficiency of the CTP routing protocol is maintained.

The invention discloses a time change method for dynamic data reconstruction of anomalous diffusion problems. According to the method, fractal derivative and fractional derivative models have the characteristics of spatial and temporal scale changes, so that dynamic data of anomalous diffusion is reconstructed on the basis of intrinsic time change; a characteristic time of a diffusion process is used as a time term scale to respond the interior movement of the diffusion process in a diffusion format, so that the reliability of a calculation result is improved, the calculation error is reduced, the stability of the calculation result is improved, the calculation efficiency is improved, a calculated amount and a memory space do not need to be added, the calculation is simple, rapid and easy to implement, the problem of result oscillation in the initial stage can be effectively solved, an accurate stable numerical value result can be obtained, solute arrival times and speeds in a relocation diffusion process of solutes can be reflected more really, and reliable guidance can be provided for engineering application; and the method can be used for simulating the processes of migration, in soil, of pollutants, petroleum seepage, underground water transportation, and relocation diffusion of moisture such as turbulent flows and the solutes, provide scientific instructions for scientifically preventing and treating environment pollution, and has important theoretical and engineering meanings.

The invention discloses a control method for a hysteresis nonlinear robot system, and belongs to the field of robot system control. A hysteresis nonlinear robot with P-I (Prandtl-Ishlinskii) is selected as a research object to measure system parameters of the robot and joint position information and joint velocity information of the robot, a performance function is introduced to convert a constraint tracking control problem of an original robot to an unconstrained stabilization problem, and unknown parameters in the hysteresis nonlinearity are regulated by employing adaptive control to designan adaptive predetermined performance backstepping control strategy. The control method for the hysteresis nonlinear robot system optimizes the transient performance of the system, improves the convergence rate, ensures the steady state performance of the system, and improves the control precision; and moreover, the adaptive parameter regulation law is employed to estimate the unknown parameters in the hysteresis nonlinearity so as to effectively solve the problems of the system oscillating and system instability caused by hysteresis nonlinearity and improve the working performances of the system.

The invention provides a method and device for controlling pan-tilt tracking camera shooting, and the method comprises the steps: calculating the speed v and the speed v1 of a previous frame accordingto the positions of a tracking target in a current frame of picture and the previous frame of picture, and determining the acceleration delta(v) through the speed v and the speed v1; determining a distance difference value x with the center of the picture; determining the maximum detection distance Smax of the distance tracking target; determining whether the tracking target and the pan-tilt movein the same direction or not according to the positive and negative values of delta(v)*delta(x), and adjusting the Smax by using delta(x) in combination with the positive and negative values of v; and determining the maximum acceleration Amax of the cradle head according to the adjusted Smax, and controlling the cradle head to rotate by utilizing the final issuing speed v2 of which the differencevalue with the speed v1 is not greater than the Amax. According to the invention, the problems of overshoot and oscillation generated when a traditional algorithm is used for carrying out pan-tilt tracking motion control are solved; the success rate of tracking the tracking target is improved by combining the characteristics of the detection algorithm.

The invention relates to a three-dimensional electromagnetic slow diffusion numerical simulation method based on super-convergence interpolation approximation. The method comprises: after a complex conductivity model is introduced into a frequency domain Maxwell equation set, an electromagnetic field diffusion equation containing a negative fractional power term of a complex frequency variable, and performing frequency-time conversion to obtain a time domain control equation containing a Caputo fractional order differential term; performing super-convergence approximation on a Caputo fractional derivative in the electric field control equation by adopting an Alikhanov super-convergence interpolation approximation method to obtain a non-uniform step size discrete approximate expression of afractional order differential item, thereby finishing stable and high-precision direct solution of the time domain fractional order differential item; and finally, discretizing the control equation based on a finite difference algorithm, deriving an electric field and magnetic field iterative equation, and finally realizing high-precision numerical simulation of three-dimensional time domain electromagnetic slow diffusion. The invention aims to solve the problems of weak singular instability and large error of fractional differential solution and realize high-precision numerical simulation ofthree-dimensional time domain electromagnetic slow diffusion.

The invention discloses a double-fuzzy control system and method of tailstock drone longitudinal posture, and relates to the technical field of drone posture control system and method. The system comprises two fuzzy controllers, the fuzzy controller I adopts variable universe fractal thought design, an error e and an error change de serve as inputs of the fuzzy controllers, parameters delta Kp, delta Ki and delta Kd of a PID controller are as outputs, the error change d e and a uniformization error accelerated speed parameter rv are as fractal factors, dynamic response performance of a systemcan be improved, and the problem of pitch attitude loop response slow speed is solved; the fuzzy controller II takes flight speed and system error as input, takes a domain of discourse C as output, uses the output to adjust the output domain of discourse range of the domain of discourse fractal fuzzy controller I in time, so that the parameters of the PID controller not only change with the changeof the system error, but also solve the problem of vibration due to the fact that the pitch attitude loop is affected by the flight speed.

The invention relates to siliceous stemming for filling a blast furnace taphole and a preparation method thereof, and belongs to the field of high-temperature metallurgical fireproof materials. The method comprises the following steps of: pre-mixing 35 to 45 mass percent of diaspore silicate, 16 to 27 mass percent of silicon carbide, 3 to 5 mass percent of micro powder, 10 to 18 mass percent of ball clay, 2 to 4 mass percent of graphite, 1 to 3 mass percent of plasticizer, 6 to 10 mass percent of ferrosilicon nitride, 2 to 4 mass percent of metal powder, 3 to 5 mass percent of modified asphalt powder and 3 to 5 mass percent of expanding agent aluminum silicate fine powder for later use, putting into a wheel roller and pre-rolling for 5 minutes; adding 15 to 20 mass percent of modified liquid tar, performing wheel rolling at a high speed for 30 to 35 minutes to ensure that a Marshall value is between 4 and 16MPa; and packaging, and measuring the Marshall value 3 days later, wherein the product is qualified when the Marshall value is between 8 and 24MPa. The problems of low high-temperature strength and high-temperature toughness of the stemming are solved, and the problems of a shallow iron notch, a broken iron notch and splashing are solved simultaneously.

The invention discloses an input current waveform optimization topological structure of an active third harmonic injection matrix converter. The input current waveform optimization topological structure comprises a three-phase alternating current power supply, an input filler, a voltage selector IVS, a bus filter, a third harmonic injection circuit, a current type inverter CSI, a three-phase alternating current load, and an output filter inductor; the voltage selector comprises a rectifying stage and three bidirectional switches; the rectifying stage comprises three bridge arms formed by an all-control type device; the third harmonic injection circuit comprises a y bridge arm formed by the all-control type device, and a harmonic injection current filter inductor Ly; and the topological structure has the bus filter on a bus. By virtue of the topological structure, input current sector switching distortion caused by switching of a high frequency bus current and a low frequency harmonic injection current of the active third harmonic injection matrix converter can be suppressed effectively, so that the input current waveform can be improved.

A polyvinyl chloride (PVC)/acrylonitrile-butadiene-styrene copolymer (ABS) tube is composed of an external hard PVC layer, an internal ABS layer, and a thermofusible adhesive layer as sandwich layer. It is prepared by three layers coextruding out method, which includes such steps as extruding out PVC-U layer by primary extruder while extruding internal ABS layer and adhesive sandwich layer by two secondary extruders, passing than through a common shaping die, sizing, cooling, winding, and packing.

The invention discloses a hybrid power gear shifting control method, which comprises the following steps of: receiving a gear shifting instruction, controlling a clutch to be disengaged, and simultaneously controlling a front-end motor to linearly and additionally output a reverse torque in the direction opposite to the torque of an engine; controlling the clutch to be completely disengaged to enter a transmission torque disappearing stage; recombining the clutch, outputting the torque to an input shaft so that the input shaft rotating speed is the same as the engine rotating speed; controlling the clutch to be disengaged again, so that the clutch restores to enter a transmission torque disappearing stage; and finally, controlling the clutch and a synchronizer to be combined in an existingmode. The rotating speed of the engine is controlled through torque change of the front-end motor to replace existing torque limiting closed-loop control over the rotating speed of the engine, and the impact feeling generated when gear shifting starts or ends is avoided; by controlling the speed difference between the rotating speed of the input shaft and the rotating speed of the engine to be reduced, the synchronizer can be engaged smoothly, the service life of the synchronizer can be greatly prolonged, or the synchronizer with lower cost can be adopted.

The invention discloses a shock absorber for mining equipment mounting. The shock absorber comprises a shock absorbing barrel, a shock absorbing spring, a piston plate, a shock absorbing barrel cover,a piston rod and a base. The shock absorbing barrel cover is connected with the upper end of the shock absorbing barrel. A guiding sleeve is arranged in the middle of the shock absorbing barrel coverin a penetrating mode. The upper end of the guiding sleeve penetrates from the shock absorbing barrel cover and is in threaded connection with a locking nut. The piston rod is arranged in the middleof the guiding sleeve in a penetrating mode. A supporting block is welded to the top end of the piston rod. A connecting plate is fixed to the side face of the supporting block. The bottom end of thepiston rod penetrates through the piston plate and an upper spring base to be connected with the fixing block. The shock absorbing spring is connected with the lower portion of the upper spring base fixedly. By mounting the shock absorbing spring in a damping medium cavity and filling the damping medium cavity with viscous fluid, sliding of the piston plate is buffered, vibration from a connectingplate to the piston rod is buffered, the shock absorber has good shock absorbing effect and shock resistant effect, and the problems that shock resistance and shock absorption during mounting of mining equipment are difficult to achieve are effectively solved through the shock absorber.

An embodiment of the invention provides a method and a device for eliminating media access control withdrawal message concussion in VPLS (virtual private LAN service). A media access control withdrawal message sent by a router includes router identification TLV (type-length-value) information, and when the router include router identification TLV information includes an identification of the local router, the media access control withdrawal message is abandoned. The method and the device for eliminating media access control withdrawal message concussion in VPLS solves the problem of media access control withdrawal message concussion in a VPLS network, so that system loss of the router is reduced and performances of a whole H-VPLS (hierarchy of VPLS) nuclear network can be improved.

The present invention relates to a dual-motor moment synchronous control system used for a hard-brittle material multi-wire cutting machine. The dual-motor moment synchronous control system used for the hard-brittle material multi-wire cutting machine comprises a motion controller, the motion controller controls a plurality of servo drivers and a plurality of motors via buses, and the plurality of motors comprise two spindle motors. The two spindle motors adopt a moment mode to control, the motion controller real-timely obtains the moment control data via an on-site bus and controls the two spindle motors according to the obtained moment control data. The dual-motor moment synchronous control system used for the hard-brittle material multi-wire cutting machine of the present invention enables the synchronism of the dual motors to be improved, solves the synchronous time delay and oscillation problems of the two spindle motors, at the same time, saves the transmission belts, and enables the system noise to be reduced.