53results about How to "Frequency controllable" patented technology

The invention discloses an experimental method of simulating dynamic and static load and a device thereof, relating to indoor model experimental technique of geotechnical engineering. The structure of the device is as follows: a model experimental platform (1), a model experimental box (2) and a load transmitting lever (3) are sequentially connected; the load transmitting lever (3) is respectively connected with a static load system (4) and a dynamic load system (5) which are respectively connected with a dynamic signal testing system (6); the dynamic signal testing system (6), a data acquisition system (7) and a computer (8) are sequentially connected. The device caries out dynamic and static load experiments on different structure models, and can monitor and collect non-linear properties of deformation and stress of gneiss under complex load condition in real time. The device has intuitional testing principle, simple structure, high precision, good stability, easy operation, convenient detachment and no high technical requirement to mounting and testing workers.

The invention relates to a two-fluid jet system, which comprises a pneumatic module, a hydraulic module, a control module and a two-fluid jet valve, wherein the control module is respectively connected with a gas pipe and a liquid pipe of the two-fluid jet valve through the pneumatic module and the hydraulic module. The two-fluid jet system is based on the microchannel gas-liquid flow movement principle, namely the control module is used for controlling gas-liquid flow velocity ratio or flow ratio of the pneumatic module and the hydraulic module, so that liquid jet of slug flow is realized in a microchannel. The two-fluid jet system is applicable to fluid jet in the fields of semiconductor film preparation, composite preparation, electronic package, MEMS (micro-electromechanical systems), spraying, ink jet, powder metallurgy, biomedicine, food processing, welding, combustion, chemical engineering and the like.

The invention discloses a measuring device of soil conductivity, mainly comprising a sensor unit and a data acquisition and processing unit; the sensor unit mainly comprises electrodes which are configured in a linear equal interval manner; the data acquisition and processing unit mainly comprises a voltage conversion circuit, a signal conditioning circuit, an analog-to-digital converter, a data controller and a liquid crystal display circuit, and also comprises a alternating-current source signal generating circuit, an alternating-current constant current source output circuit and an alternating-current constant current source regulating circuit. According to the measuring device of soil conductivity, the invention also discloses a measuring method of soil conductivity. The invention can regulate the size of exciting current input into the soil at any time according to soil characteristics of the measured farmland so as to guarantee that the sensor works at the linear area under any soil condition, has high measuring accuracy and also has the function of data display and storage.

The invention discloses a device and a method for manufacturing uniform spherical micro-particles. The device comprises a crucible, an induction heater, an induction coil, a concentrator, a mechanical pump, a diffusion pump, a cavity, a high-speed camera and a collector. The device and the method have the advantages that capillary jet flow is cut by the aid of electromagnetic force to manufacture the uniform spherical micro-particle, metal materials molten in the crucible are ejected from small holes in the bottom of the crucible under the effect of pressures to form the capillary jet flow, the electromagnetic force is generated by the induction coil and acts on the capillary jet flow via the concentrator, sausage-shaped liquid droplet strings are gradually formed by the capillary jet flow under the disturbance effects of surface tension and the electromagnetic force and can be ultimately dispersed to form liquid droplets with consistent sizes and equal distances, and metal particles can be formed by the liquid droplets in containerless solidification procedures; the metal particles manufactured by the aid of the method are uniform in particle size (the relative deviation of the particle sizes is smaller than 1.8%) and are high in sphericity, and manufacturing materials can be prevented from being polluted by the crucible in the solidification procedures.

The invention belongs to a brake hydraulic pipeline exhausting method and particularly relates to a hydraulic system automatic exhausting device and method for an electro-hydraulic brake test bed. Thedevice comprises a front brake wheel cylinder, a test bed body, a transparent hose, a rear brake wheel cylinder, a vehicle electronic stabilization system, a brake master cylinder, a liquid storage pot, an electronic mechanical brake booster, a support, a brake pedal, an adjustable seat, a signal acquisition and transmission platform, a PC, brake master cylinder hydraulic pipelines, two-positiontwo-way solenoid valves, caliper disk brakes and brake wheel cylinder hydraulic pipelines. The device automatically judges the exhausting completion moment through recognition processing according tothe state, acquired by cameras, of brake fluid discharged from the transparent hose, controls rotation of a motor through an ECU of the mechanical brake booster to achieve operations of treadling a pedal and loosening the pedal by simulating a person. The device can be more accurate, efficient, convenient and thorough in automatic exhausting control. The problems that time and labor are wasted, exhausting is incomplete and brake fluid corrodes operators can be solved.

The invention discloses an electromagnetic pile driver which comprises a fixed disc, electromagnets arranged in the fixed disc, a movable disc, closed coils and an electromagnetic hammer formed on the movable disc, wherein the closed coils are arranged on the movable disc and correspond to the electromagnets. Electric energy is adopted as the energy source by the pile driver, the electromagnets are arranged in the fixed disc, the closed coils are arranged in the movable disc, the electromagnetic hammer is connected to the movable disc, and the intensity of the electromagnets is changed according to the Lenz law to achieve piston movement of the movable disc, so that precise control over the pile driving force and frequency is achieved; meanwhile, energy is saved, emission is reduced, and noise is lowered.

The controllable gas vibrating system includes one exciting barrel, one piston, one guide bar, two baffle plates separately on two ends of the exciting barrel to form one sealed space together with the exciting barrel, ball valves, two motors and one control system to control the rotation of the motors. The piston is set on the guide bar for sliding relatively to the guide bar and inside the sealed space to separate the sealed space into one right gas chamber and one left gas chamber with ball valve controlled gas inlet and gas outlet each. The controllable gas vibrating system has controllable vibrating frequency, low cost and use convenience.

The invention discloses a medium loading adjustable filter which comprises a rectangular waveguide, a tuning medium piece, and a driving mechanism. The cavity is divided into a plurality of resonant cavities by a set of partition walls arranged in the cavity and parallel to the E face, the wide edge pipe wall of one side of the rectangular waveguide is provided with at least one slit correspondingto the position of each resonant cavity, the slit is distributed along the bisector of the E face, and the length direction of the slit is parallel to the E face, the tuning medium piece is a comb-shaped structure with a set of comb teeth pieces, the length and the thickness of each comb tooth piece are the same, all the comb teeth pieces of the comb-shaped structure can be inserted into the cavity of the rectangular waveguide without friction through the slit at the same time, the number of the comb teeth pieces inserted into each resonant cavity is the same; and the driving mechanism is used for driving the tuning medium piece and adjusting the insertion depth. The invention further discloses a design method of the filter and an adjustable duplexer. According to the invention, the electrical performance is better, the structure is simpler, and the production cost is lower.

The invention relates to a gesture recognition system based on muscle electrical impedance signals. The gesture recognition system comprises a signal acquisition unit and an upper computer data processing unit, the signal acquisition unit comprises a main control module, a signal driving module, a signal detection module, an AD acquisition module and a wireless communication module; the main control module is connected with the signal driving module, the AD acquisition module and the wireless communication module; the signal detection module is respectively connected with an electrode and theAD acquisition module; the wireless communication module is connected with an upper computer through wireless transmission and transmits collected signals to the upper computer for processing. The system and method can directly reflect the intrinsic state of the muscle, has good sensitivity to low-speed movement, and is high in muscle contraction sensitivity, good in robustness, large in signal amplitude, controllable in frequency and simple in preprocessing.

The invention provides an electrical stimulation system with a fatigue evaluation function. The electrical stimulation system comprises a multiplexing electrode slice, an EIM excitation current module, an FES stimulation current module, a control module and an acquisition module, and the multiplexing electrode slice is connected with the EIM excitation current module, the FES stimulation current module and the acquisition module respectively. The EIM excitation current module is used for generating an excitation current signal; the FES stimulation current module is used for generating FES stimulation signals. The electrical stimulation system has the advantages of being simple in feedback control process, stable in measurement process during resting, good in robustness and not prone to being disturbed by external factors, the amplitude of the feedback signals is large, the frequency is controllable, and preprocessing is simple. According to the scheme, on the basis of the electrical stimulation system, an EIM detection link is added, the stimulated local muscle fatigue state is fed back to the system in real time, excessive treatment caused by muscle fatigue is avoided, and the rehabilitation effect is improved.

The invention provides a jiggle corrosion abrasion-micro amplitude collision abrasion test machine. The test machine consists of a main machine and a system, wherein the system comprises a measurementcontrol system and a cooling system; the main machine comprises a device base, a driving motor, an eccentric wheel mechanism, a lever-type swinging-arm mechanism and an electric heating furnace; thelever-type swinging-arm mechanism drives a shaft pin of a rolling bearing serving as a rotating center, and is arranged on the device base through front and rear brackets with balls; a frequency-variable motor enables the lever-type swinging-arm mechanism to produce reciprocating swing by using the shaft pin as the center and using a pin roller bracket as a plane through an eccentric wheel which is arranged at the shaft end and provided with the rolling bearing; each part is lubricated by lubricating grease; and a hole at the bottom of the electric heating furnace enables the lower part of a swinging-arm test section to be supported on the pin roller bracket. The test machine is used for representing the jiggle corrosion abrasion and micro amplitude collision abrasion work properties of crowned turbine blades, blades with various intermediate damping tables and blade vibration damping device and the like in the power mechanical devices in aviation, ship, industrial gas turbine and steam turbine and the like, and can be applied to the similar machinery.

The invention discloses a transverse defect verification method in eddy current testing, comprising the following steps: adopting an eddy current testing detection flow line; determining the position of a flaw on a steel wire; determining the initial scale of a flaw of the pipe cutting device with the vernier adjustment knob; determining the depth of the flaw on the steel wire; determining the length of the flaw on the steel wire; starting a drawing device for drawing the steel wire, and starting a flaw detection device to carry out flaw detection; if the flaw detection device can detect the flaw position and alarm for stoppage, proving that the flaw detection device satisfies requirements on sensitivity; and if the flaw detection device cannot detect the flaw position, proving that the flaw detection device is insufficient in sensitivity and needs repair. The transverse defect verification method adopts an on-line flaw cutting and on-line verification scheme, the flaw is cut with the pipe cutting device during the production process of the steel wire, the length and depth of the flaw are determined, then a detector is used for detecting the flaw for verifying the sensitivity of the detector, and the method is quick, high in accuracy, lower in cost and flexible and convenient in use due to controllable verification frequency and controllable defect size.

The invention relates to the technical field of foil gas bearing load loading experiment devices, and specifically relates to a foil gas bearing comprehensive experiment table device that comprises anaxial load loading unit, a radial load loading unit, a rotor system experiment table main body unit, a sensor unit and a base; the axial load loading unit, the radial load loading unit, the rotor system experiment table main body unit and the sensor unit are fixedly connected with the base; a rotating shaft penetrates through the rotor system experiment table main body unit, the rotating shaft isrotatably connected with the rotor system experiment table main body unit, and the axial load loading unit and the radial load loading unit respectively apply axial and radial loads to the rotating shaft. The invention also provides a fail gas bearing comprehensive experiment method. The characteristics of the foil gas bearing under different loads and different medium environments are researchedby changing the loads and the gas medium. The loading process is free of friction, small in vibration, stable and reliable in static load and controllable in dynamic load size and frequency.

A conversion method and circuit from product to pulse applies analog signal product to be converted to certain frequency output pulse in stead of analog circuit existed in present technique. It is made by converting the product of two analog signal into a certain frequency output pulse with the pulse frequency relating to the big or small or signal product, converting analog signal into digital signal 1 and modulated signal 2 by analog-digital converter and modulator, multi plying digital signal, with modulated signal 2 by multiplier to create digital signal 2 which being filtered for product, converting the product into a certain frequency pulse signal by product-pulse converter. The sampling frequency of two route analog signal can be different as well as the working frequency of product-pulse converter and the output frequency of product also can be different.

The present invention discloses a method, system and device of a communication network distributed routing protocol convergence time test. The method comprises: obtaining the routing entry information of each node in a routing management module in a communication network, performing statistics and analysis, and dynamically measuring and calculating the convergence time of the distributed routing. The present invention is characterized in that: a system-level and network-level communication network routing protocol convergence time test method, system and device are provided. The test method has universality and can perform convergence time test of a plurality of distributed routing protocols such as RIP, OSPF, EIGRP and the like. The test object coverage range is wide to perform test of a plurality of network nodes at the same time, and the frequentness gathered through routing information is controllable so as to improve the test accuracy and the automation degree. The WIFI link transmission test information is employed so as not to influence the routing protocol performance caused by extra bandwidth consumption introduced by the test network.