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111 results about "Power index" patented technology

Power Index is a score (0 to 100) that represents your raw force. Ultimately, ball speed is a result of bat weight, swing speed, and quality of contact. In the Power Index, we focus on weight and speed, plus how quickly you generate that speed.

Method and apparatus for testing football helmets

A method and apparatus for testing a football helmet utilizes a weighted pendulum arm to impart an impact force upon the helmet. Linear head acceleration and rotational head acceleration caused by the impact force is measured and a Head Impact Power Index is computed and used as a standard to judge the ability and effectiveness of the football helmet in preventing injury to a football player.
Owner:RIDDELL

Ballastless track designing, checking and calculating system based on space detail solid model

InactiveCN103514309AAvoiding defects in calculation of ballastless track internal forceGuide design practiceSpecial data processing applicationsElement modelAxial force
The invention relates to a ballastless track designing, checking and calculating system based on a space detail solid model. A method includes the following steps that a finite element model of a steel rail, a ballastless track system and a lower portion foundation is built; according to the model, the bending moment and the internal force of each structural layer of the track system under the action of loads are calculated; according to the bending moment and the internal force obtained through calculation, a detail checking and calculating model of a solid steel bar unit, a ballastless track system solid unit and the lower portion foundation is built; according to the checking and calculating model, the internal force, the stress and deformation conditions of the steel rail, the ballastless track system and the lower portion foundation under different loading conditions are checked and calculated, and stress of detail connecting steel bars is checked and calculated. The designed models can extract the bending moment and the axial force, under the action of the loads, of the track system, and a power evaluation model considers a detailed structure mode of a vehicle and the lower portion, uses self-compiled programs for completing wheeltrack contact and achieves extraction of power indexes of the vehicle in high-speed running.
Owner:BEIJING JIAOTONG UNIV

Detection method of radio frequency path and mobile terminal

The invention provides a detection method of a radio frequency path and a mobile terminal. The method comprises the following steps: detecting power index of the radio frequency path during transmitting data; determining whether the power index meets a preset condition that the path is abnormal; determining that the radio frequency path is abnormal if the power index meets the preset condition that the path is abnormal; and outputting a prompt message associated with the the radio frequency path abnormality. Through the method, the prompt message that the radio frequency path is abnormal can be output immediately when the radio frequency path is abnormal so as to provide feedback that the radio frequency path is abnormal to the user in time.
Owner:VIVO MOBILE COMM CO LTD

Simple support beam damage and moving force simultaneous identification method under moving load

The invention provides a simple support beam damage and moving force simultaneous identification method under a moving load. The simple support beam damage and moving force simultaneous identification method under the moving load includes steps: measuring accelerated speed power responses of a structure in damage status, and using the accelerated speed responses of the structure as power indexes of structure damage and moving force identification; using Chebyshev polynomials to represent the unknown moving load according to a structure numerical model, and using a beam element shape function concept to equalize the moving load to unit node force, and respectively figuring out sensitivity matrixes of the structure accelerated speed responses for damage and moving force parameters; using a responsive difference between each measured structure accelerated speed response and a finite element accelerated speed response which is obtaining through calculation as an objective function by using a sensitivity analysis result in combination, and using a first order Taylor expansion identification equation to perform iteration step by step and simultaneously identify damage and moving force of a simple support beam. The simple support beam damage and moving force simultaneous identification method under the moving load can achieve simultaneous identification of the damage and the moving force only through a small quantity of the measured accelerated speed responses of the structure, and is strong in practicability.
Owner:HUAZHONG UNIV OF SCI & TECH

Anisotropy evaluation method for rock structural surface shear strength

InactiveCN108446431AComprehensive quantitative evaluationGeometric CADSpecial data processing applicationsAdditive ingredientSpectral density
The invention discloses an anisotropy evaluation method for rock structural surface shear strength. The method comprises the following steps that: S1: obtaining the rock structural surface outline curve models of different shearing directions; S2: on the basis of the one-side PSD (Power Spectral Density)* of the rock structural surface, calculating the comprehensive power index Pf of each frequency ingredient which forms the rock structural surface for the roughness contribution of the rock structural surface; S3: calculating a corrected gradient mean square root Z2<*>; S4: on the basis of thecomprehensive power index Pf and the gradient mean square root Z2<*>, calculating the roughness parameter PZ of the rock structural surface; and S5: calculating the shear strength in different sheardirections of the rock structural surface. By use of the method, on the basis of the power spectral density, the contribution of each frequency ingredient which forms the rock structural surface for the roughness of the rock structural surface and the anisotropy characteristic of the roughness of the rock structural surface are analyzed, and therefore, the anisotropy of the shear strength of the rock structural surface can be more comprehensively subjected to quantitative evaluation.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)

Photovoltaic power station power prediction system based on cloud platform

The invention discloses a photovoltaic power station power prediction system based on a cloud platform, which comprises a cloud platform, a photovoltaic power station client, a power grid dispatching center and a meteorological data module, wherein the cloud platform is used for calculating a power generation power prediction value of the photovoltaic power station according to the state information of the photovoltaic power station; the photovoltaic power station client is in network connection with the cloud platform and the power grid dispatching center for monitoring and providing the state information of the photovoltaic power station to the cloud platform and adjusting the actual power generation power of the photovoltaic power station according to a power generation power index value of the power grid dispatching center; the power grid dispatching center is in network connection with the cloud platform and the photovoltaic power station client for determining the a power generation power index value of the photovoltaic power station according to the power generation power prediction value of the photovoltaic power station calculated by the cloud platform and sending the power generation power index value to the photovoltaic power station client; and the meteorological data module is in network connection with the cloud platform for providing weather forecast data for the cloud platform. The system of the invention has the advantages of low construction and maintenance cost, convenient maintenance and high prediction precision and the like.
Owner:CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST

Acoustic power multi-stage amplification traveling-wave thermoacoustic engine system

The invention discloses an acoustic power multi-stage amplification traveling-wave thermoacoustic engine system, which consists of a loop structure formed by connecting N stages of thermoacoustic engine units end to end through resonant tubes and a load, wherein each unit is equal in length and unequal in cross sectional area; the units form a loop from large to small cross sectional areas or from small to large cross sectional areas, and the stages of the units are higher if the cross sectional areas of the units are larger; the resonant tubes are equal in length and unequal in cross sectional area; the cross sectional area of the resonant tube between the first and Nth stages of units is minimal, and the cross sectional areas of the other resonant tubes are enlarged along with the enlargement of the cross sectional areas of the units connected by the resonant tubes. When the system works, heat is converted into acoustic power under the temperature gradient of a reheater of each unit, the acoustic power is transmitted and amplified along the forward direction of the temperature gradient, and the amplified acoustic power is transmitted into the reheater of the unit of the next stage, and is amplified and transmitted to the unit of the stage after the next stage; most of the acoustic power which is amplified in multiple stages is consumed by the load, and the other is transmitted to the first stage of unit to continue the process. According to the system, an acoustic power index can be multiplied, so that a high-power load is favorably driven; the reheaters are positioned in a traveling-wave phase, so that thermoacoustic conversion efficiency is high.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

Antenna module

The invention discloses an antenna module which comprises an antenna main body, an adjustable matching circuit, a power detector and a control unit; the antenna main body is provided with a signal feed-in point; the adjustable matching circuit is electrically connected with the antenna main body and a power amplifier, is used for providing a load resistor, is provided with adjustable impedance matching assemblies which are connected mutually, and is electrically connected to the signal feed-in point; the power detector is electrically connected with the adjustable matching circuit and the power amplifier, and is used for detecting a power index; and the control unit is electrically connected with the adjustable matching circuit and the power detector, and is used for reading an output power index and a signal intensity index, generates a control signal to the adjustable matching circuit according to the operation of the output power index and the signal intensity index, so as to change the load resistor continuously to reach impedance matching.
Owner:HTC CORP

Method for evaluating repairing effect of steel bridge deck asphalt concrete pavement pit slot repairing interface

The invention relates to the technical field of road building materials, and particularly discloses a method for evaluating a repairing effect of a steel bridge deck asphalt concrete pavement pit slot repairing interface. The method comprises the following steps: moulding an asphalt concrete test piece by using a gyratory compactor, cutting the test piece into two halves, and bonding the two halves of the test piece together by using a repairing agent; bonding the repaired test piece onto a steel plate mould; performing a loading test, and recording relevant data in the test process; when the maximum tension in a certain period is reduced to be 25% that in a first period, stopping the loading test; establishing a curvilinear relationship between the load and the displacement in each period to obtain fatigue fracture energy; establishing a relationship between the maximum load and the loading period number in each period, regressing to obtain a coefficient b of a power index fatigue equation. According to the technical scheme, the problem that in the prior art, -a method for pre-evaluating the repairing effect of a steel bridge deck asphalt concrete pavement pit slot repairing material is lacked is solved.
Owner:北京市道路工程质量监督站

Control method and system of electricity theft detection used for medium and low voltage mixed power distribution network

The invention provides a control method and a system of electricity theft detection used for a medium and low voltage mixed power distribution network. The method includes: in the selected medium and low voltage mixed power distribution network, a set M including n to-be-detected nodes is set, a to-be-detected node Mi is selected and measured, power index values of the medium and low voltage mixed power distribution network are obtained, the weight of a measuring value is set, state estimation calculation of the medium and low voltage mixed power distribution network is conducted, and an active load estimation value of Mi is obtained; the active load estimation value of Mi and the practical measuring value are compared, if an absolute value obtained by subtracting the practical measuring value from the active load estimation value is greater than a preset detection threshold, it is determined that Mi has electricity theft behaviors; and another Mi is selected from the set M, the above operation process is repeated, and the process is stopped until the determination of electricity theft behaviors of all Mis in the set M is accomplished. According to the method and the system, problems that the analysis results of electricity theft are inaccurate and users with electricity theft cannot be discovered via the prompts of a meter device or regular manual inspection at the spot are solved.
Owner:TIANJIN TRANSENERGY TECH
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