31 results about "Oscillatory power" patented technology

A cutting saw blade for use with an oscillatory power tool used in surgical bone cutting procedures including a blade having a distal end provided with teeth whose tips are located on a tangent line perpendicular to the long axis of the blade. The teeth are configured substantially as right triangles with their hypotenuses facing either towards the center of the blade or away from the center of the blade. A central tooth can be optionally provided. The surgical saw blade may have a distal end having at least one pair of teeth configured to be adjacent to each other and each of the pair of teeth is configured as a right triangle each having a hypotenuse which is oriented at least one of towards and away from the centrally positioned long axis.

The invention discloses a portable tool having a housing with a gearhead, having a motor shaft which can be rotationally driven by a motor and which can be coupled via an eccentric coupling drive to a tool spindle for the drive thereof, wherein the tool spindle can be driven in a rotational oscillatory manner about the longitudinal axis thereof and is configured for accommodating a tool, wherein a motion-reversal drive is provided which is configured for converting an oscillating drive movement produced by the eccentric coupling drive into an oscillating output movement which has a direction of oscillation opposed to said drive movement. The motion-reversal drive is configured as an epicyclic gearing.

A densifier is provided which in one embodiment can simultaneously densify two cryogenic liquids at different temperatures. The densifier has an oscillatory power source for generating oscillatory power and a two stage pulse tube refrigerator. The oscillatory power source can be a thermoacoustic heat engine or a mechanical oscillatory power source such as a linear flexure bearing compressor. The first stage densifies a first cryogenic liquid to a first cryogenic temperature, and the second stage densifies a second cryogenic liquid to a second, lower cryogenic temperature. A densified propellant management system also is provided which has a densifier for simultaneously densifying two cryogenic liquids at different temperatures, and a cryogenic temperature probe for measuring the temperature gradient in a cryogenic liquid.

An oscillatory power tool that is capable of using various types of cutting tools is disclosed. The power tool includes an output shaft for mounting one of the cutting tools and driving the cutting tool in an oscillating rotary motion. An end of the output shaft has a driving section for engaging with a securing section of the cutting tool. The power tool further includes a fastener connected to the output shaft at the end and connectable to the securing section of the cutting tool for fastening the cutting tool to the end of the output shaft. The driving section has a fitting surface for contacting a surface of the securing section. Through a close fit between the friction surface and the surface of the securing section, the power tool can be connected with different types of cutting tools, which greatly improves the universality and convenience of the power tool.

The invention belongs to the technical field of the on-line detection and analysis of electric power system low-frequency oscillation. The invention provides a method for quantitatively evaluating the contribution degree of an electric generating set associated with a node participating in the oscillation of certain mode to the oscillation power of the mode in a power system, only based on the information of Wide Area Measurement System. In the method, a concept of node contribution factor is first proposed based on injection active oscillatory power, and then according to the amplitude of injection active oscillatory power and the relative phase position among active oscillatory power curves under certain frequency mode, an analysis and calculation method is provided corresponding to thenode contribution factor of the frequency mode, and the homology and grouping of the node are realized at the same time. The method is applicable to a system without an electromagnetic ring net and consideration for losses and can also be used for an actual electric power system which has the above characteristics through simplification.

The application discloses a graphene-based main oscillation power amplifier, including a main oscillation laser, a first beam expander collimator, a transmissive graphene optical isolator, a first amplifier, a mirror, a second beam expander collimator, a reflector type graphene optical isolator, a second amplifier; the transmissive graphene optical isolator includes a first substrate, the first graphene film positioned at the front of the first substrate or the back of the first substrate; the reflective graphene optical isolator includes a second Substrate, the second graphene film positioned at the front of the second substrate; the diameters of the first graphene film and the second graphene film are greater than the diameter of the incident laser, and the front of the first substrate and the front of the second substrate are respectively facing the first beam expander The surface of the collimating device and the surface of the second beam expander collimating device. The transmissive graphene optical isolator and reflective graphene optical isolator have the ability to suppress small signal noise light and high-power laser light to pass through without loss, and can effectively ensure the laser power stability of the main oscillation power amplifier.

An oscillatory power tool that is capable of using various types of cutting tools is disclosed. The power tool includes an output shaft for mounting one of the cutting tools and driving the cutting tool in an oscillating rotary motion. An end of the output shaft has a driving section for engaging with a securing section of the cutting tool. The power tool further includes a fastener connected to the output shaft at the end and connectable to the securing section of the cutting tool for fastening the cutting tool to the end of the output shaft. The driving section has a fitting surface for contacting a surface of the securing section. Through a close fit between the friction surface and the surface of the securing section, the power tool can be connected with different types of cutting tools, which greatly improves the universality and convenience of the power tool.

The invention discloses a method for simultaneously testing the frequency and power of a return-wave tube oscillating microwave signal, comprising: step 1, degassing the return-wave tube in a vacuum oven to obtain A; step 2, soldering wires to the output electrode of A, The different output electrodes of the return wave tube are distinguished by the color codes of the wires of different colors to obtain B; step 3, evenly coat the ceramic part of the electron gun of B with silicone rubber and let it stand for no less than 24 hours, and then pour the insulating silicone rubber Seal and let stand for no less than 12 hours to obtain C; step 4, install the magnetic system fixing bracket on C to obtain D1, then install D1 in the magnetic system to obtain D2, install D2 on the three-axis adjustment tooling and D is obtained by fastening the connection part. The invention can simultaneously measure the oscillation frequency and oscillation power of the return wave tube in operation.

The invention relates to an interval oscillation damping method based on input signal switch of FACTS of WAMS and PSS, and belongs to the technical field of power system stability and control. When interval oscillation occurs in a call wire of an electrical power system, oscillation occurs in power on call wires between areas, and oscillatory power of the wires is adjusted through a FACTS device. Varying quantity of active power of the wires is calculated according to reactive power provided by FACTS, and a calculated value is variable quantity of electromagnetic power of a generator. The size of damping moment coefficient can be solved according to the relationship between the electromagnetic power of the generator and damping, and at last by comparing the relationship between the solved value of damping moment coefficient and a set threshold value, the phenomenon that a generator electromagnetic power signal or a generator speed signal is adopted by a signal input by PPS is judged. Real data detected by a WAMS system are not needed, only WAMS sends a trigger signal to PSS when the oscillation occurs in the wires, and the trigger signal is not sent when the oscillation does not occur.

The invention belongs to the technical field of ultrafast lasers, and discloses a high-brightness main oscillation power amplifying picosecond laser system, comprising an all-polarization-maintaining fiber picosecond seed laser, a fiber collimator, a space isolator, 45° total reflection mirror, polarization beam splitter prism, one-stage solid-state traveling wave amplifier, two-stage solid-state traveling wave amplifier and three-stage solid-state traveling wave amplifier, the first-stage solid-state traveling wave amplifier is located on the transmitted light side of the polarization beam splitter The wave amplifier is located on the reflected light side of the polarization beam splitter prism, and the fiber collimator is connected to the all polarization maintaining fiber picosecond seed laser through the pigtail. The picosecond laser system disclosed by the invention has the advantages of simple structure, stable performance and easy maintenance, and can realize high-brightness 1064 nm laser output. By setting up a frequency doubling module that is easy to integrate and disassemble, based on 100W fundamental frequency light, it can achieve more than 50 W The green light output can meet the needs of a wide range of industrial applications.

Disclosed are a method and circuit for 75o KHz high voltage gas discharge lamp driving. The circuit comprises a high voltage rectification filter unit and a direct-current voltage reduction and stabilization unit, and the output of the voltage reduction and stabilization unit is connected with a control chip in an intelligent oscillation control unit; square signals output by two pins of the control chip are set to be 750 KHz; meanwhile, the falling edge of the square signal output by the first pin is made to be earlier than the rising edge of the square signal output by the second pin by a certain time, and the rising edge of the square signal output by the first pin is made to be later than the rising edge of the square signal output by the second pin by a certain time. The method and circuit have the advantages that according to the scheme, the method and system can be away from an acoustic resonance window area, second-order conversion is adopted, electric energy losses are small, electric energy conversion efficiency is improved, stroboflash does not exist, and optical efficiency is high. The selected control chip is low in price and strong in function, the drive frequency and the half-bridge oscillatory power unit dead time of the high voltage gas discharge lamp can be controlled, the process is simple and convenient to implement, the rate of finished products is high, and batch production is facilitated.

A method for analyzing broadband disturbance stability factors of regional power grid based on ergodic impedance. The method detects the three-phase voltage and three-phase current signals of the AC bus access line of the substation and calculates the oscillating power and impedance at the oscillating frequency point to give The stability criterion is obtained. Combined with the characteristic data of the system operating conditions at the time of oscillation, a set of oscillation-related factors for stability judgment is established, and the set of important and unimportant factors affecting the system oscillation is obtained by analysis. This method can analyze the related factors before and after the system oscillation according to the disturbance data that exists in the power system all the time, so as to obtain the main factors that affect the sub- / super-synchronous oscillation generated by the grid connection of the new energy station, which is suitable for large-scale wind turbine generators. Effective prevention and control of sub-synchronous / super-synchronous oscillation occurs when the grid is connected.

The invention discloses a method and a device for obtaining oscillating power under grid transient faults. When grid transient faults occur in power electronic equipment, the method first measures the inductance voltage and current of the network inductance branch, and measures the inductance voltage and current respectively. Perform Hilbert transform; then calculate the instantaneous resistance represented by the network inductance branch according to the inductor voltage, current, Hilbert transform voltage parameter, and Hilbert transform current parameter; and calculate the network inductance branch The instantaneous power of ; extract the power consumed by the instantaneous resistance related to the instantaneous resistance from the instantaneous power, and use the power consumed by the instantaneous resistance as the oscillation power. The invention can help to solve the existing problems that the amplitude frequency of the internal potential of the power electronic equipment changes with the imbalance of the input and output power of the equipment, and the change of the amplitude and frequency of the internal potential will adversely affect the input and output power imbalance of the equipment through the network. There are flaws in the technology.