254 results about "Response spectrum" patented technology

A lighting fixture for facilitating plant growth and a light emitting component. The fixture comprises a single light emission source LED device which provides at least two emission peaks in the wavelength range of 300-800 nm and at least one of the emission peaks has Full Width of Half Maximum (FWHM) at least 50 nm or higher. The emission peaks of the LED match well with a plant photosynthesis response spectrum and is therefore particularly suitable for high efficiency artificial lighting.

A vehicle system structure vibration and noise transmission path detecting system belongs to the technical field of automobile design. In the invention, a vehicle system analysis model building module builds incentive related bus, vehicle structure and acoustic cavity models and sets up a vehicle system analysis model; a vibration or noise response spectrum acquiring module acquires the vehicle structure vibration or passenger indoor structure noise response analysis; a transfer path power calculating module calculates the transfer power of all transfer paths and the total power transferred to the vehicle; a main transfer path detecting module calculates and orders the contribution of all the transfer paths, and identifies the main transfer paths; an optimized design module identifies the main influential factors for transfer of the power flow of the main transfer paths, applies an optimized design method to improve relevant bus characteristic parameters and structure types, and verifies the parameters in the vehicle system or the vibration absorbing and noise reducing effect after structure improvement. The vehicle system structure vibration and noise transmission path detecting system can improve the accuracy of transfer path identification and possibility of effective control to the transfer paths.

The invention discloses a fiber bragg grating array-based phase-sensitive optical time domain reflection device and method. The device includes a light source, a laser frequency adjustment module, a modulator, an optical fiber amplifier, a circulator, a sensing optical fiber, a light detector, a data acquisition module and a data processing module; the sensing optical fiber is provided with an optical fiber array formed by a plurality of FBGs (fiber bragg grating) which are arranged equidistantly; the laser frequency adjustment module is used for frequency adjustment of continuous light emitted by the light source; the continuous light is modulated by the modulator so as to form pulsed light; the optical fiber amplifier performs power amplification on the pulsed light; the sensing optical fiber is used for receiving and transmitting the pulsed light which has been subjected to power amplification; the light detector receives scattered light and reflected light; the scattered light and reflected light are acquired by the data acquisition module; and the data processing module generates interference signal frequency response spectrum and obtains the length variation quantity of the sensing optical fiber between two adjacent FBGs through processing. With the fiber bragg grating array-based phase-sensitive optical time domain reflection device and method of the invention adopted, strain quantitative detection can be realized, and high-spatial resolution measurement can be realized based on quantitative analysis.

The invention discloses a modal damping ratio rapid calculation method based on a pulse excitation response spectrum. The method comprises the following steps: firstly, determining excitation and vibration pick-up positions of a structure, wherein the excitation and vibration pick-up positions are on a node and a nodal line adjacent to a modal shape, and have remarkable responses under various test modal shapes; recording a vibration pick-up point response signal by a signal acquisition device, and performing discrete Fourier transform to obtain a response spectrum; extracting corresponding responses under a resonance (or peak) frequency an adjacent frequency thereof on the basis to obtain a stable response amplitude; and lastly, calculating relevant parameters such as a frequency ratio and a response ratio in order to realize identification of a modal damping ratio of the structure. Through adoption of the method, the technical problems that semi-power points are difficult to find accurately in a conventional semi-power method, a frequency response function needed for calculating the modal damping ratio cannot be acquired sometimes in a frequency domain method since certain excitation time domain signals are difficult to measure directly, and transient components are attenuated incompletely, operations are complicated and the like in response under contact type excitation in the prior art can be solved.

The invention discloses a selection method for inputting earthquake waves in time-procedure analysis for earthquake resistance of complex structures to meet the earthquake-resistant requirements of the complex structures such as a high-pier long-span girder bridge, a cable-stayed bridge, a suspension bridge and a super high-rise building. The method comprises the steps that firstly, alternative earthquake waves which meet different site conditions such as earthquake magnitude, distance, an acceleration peak value and long cycle characteristics are selected in an American PEER strong earthquake record database, and a primary-selection database is formed; secondly, the minimum relative weighted average error of spectrum values of alternative earthquake wave response spectrums and design response spectrums in the primary-selection database near previous orders of periodic points of platforms stages and the complex structures is used as a double-control index according to site conditions, and the specific input earthquake waves are determined to meet the requirement that a time-procedure analysis result is in accordance with response spectrum analysis analytic statistics. According to the selection method, engineering realization is easy to achieve, and the method is compared with multiple mode decomposition reaction spectrum methods. In addition, due to the fact that the earthquake waves are selected in the appointed primary-selection database, similar classification of the site conditions is ensured, and the quality of input earthquake waves is ensured.

The invention discloses a fiber bragg grating sensing dynamic load identification method based on AR model and mahalanobis distance. The method comprises the following steps: arranging the position of a distributed fiber bragg grating sensing network; monitoring and collecting impact response dynamic signals in real time; analyzing time domains of impact response signals and determining a response spectrum characteristic frequency capable of representing impact position information; extracting wavelet-packet-analysis-based spectrum response characteristic frequency and building an AR model parameter matrix; judging similarity between the impact position signals and response signals in a sample library of the AR model parameter matrix by using mahalanobis distance, primarily determining the area of the impact load to be monitored according to three impact positions with high similarity, then accurately identifying the impact load position by using a triangular center location method. Since a fiber bragg grating demodulating system is relatively low in demodulating frequency, the impact load cannot be located by using a time difference method; compared with the conventional time domain locating method, the method is simple and reliable.

The invention discloses a spectral method-based multi-component gas concentration analysis method. The spectral method-based multi-component gas concentration analysis method comprises the following steps: determining a background gas absorption response spectrum in a wide spectrum range; determining a standard sample absorption response spectrum in the wide spectrum range; determining an absorption response spectrum of to-be-detected mixed gas in a standard sample; determining the concentration value of each component in the to-be-detected mixed gas in the standard sample. Background automatic calculation of an absorption spectrum signal is realized according to an asymmetric reweighted penalty function lease square method; the problem of water vapor and component anti-interference erroris solved by using a differential type anti-interference wavelength selection algorithm, and the real-time on-line analysis requirement of a high-sensitivity and anti-interference spectral analysis device is met.

The invention discloses a load spectrum testing method for a hydraulic excavator working device. The load spectrum testing method comprises the following steps of (a) respectively arranging strain foils on piston rods of a movable arm hydraulic cylinder and a scraper pan hydraulic cylinder; (b) locking the movable arm hydraulic cylinder and a scraper pan rod hydraulic cylinder, only enabling the piston rod of the scraper pan hydraulic cylinder to flex so as to push a scraper pan to execute an excavation operation, and respectively testing strain-time response data of the piston rods of the movable arm hydraulic cylinder and the scraper pan hydraulic cylinder in the respective rod length directions under the conditions; and (c) obtaining a stress response spectrum of excavator scraper pan teeth and taking the stress response spectrum as the load spectrum of the working device by utilizing the tested strain-time response data. The invention further discloses a stress response spectrum simplification operation formula constructed based on stress analysis; according to the load spectrum testing method for the hydraulic excavator working device, which is disclosed by the invention, the load spectrum test process of the excavator working device can be realized by a simple, quick and easy-to-operate manner, the tested load spectrum can be applied to the life evaluation, and the effective evidence can be provided for the structure optimization design of hydraulic excavator working device.

The invention relates to a pneumatic device for a pneumatic type horizontal impact table. The pneumatic device for the pneumatic type horizontal impact table comprises an impact push plate, an impact air cylinder, an air cylinder support and an air storage cylinder, wherein the impact push plate is fixedly arranged on a piston rod in the impact air cylinder, the impact air cylinder is connected with the air storage cylinder, and the impact air cylinder and the air storage cylinder are fixedly arranged on an impact table base through the air cylinder support. The energy of the pneumatic device for the pneumatic type horizontal impact table is much larger than that of pendulum bob impact on the aspect of achieving the maximum impact energy of impact hammers, and thus the demands of high-order impact response spectrum simulation test verification of spacecraft products can be met.

The invention relates to an earthquake proof performance analysis method of a dry type transformer for nuclear power, comprising the following steps of: preliminarily designing a structure, determining a computation model, analyzing an electromagnetic field, statically analyzing the structure, determining earthquake action input conditions, calculating the strength of the computation model, estimating earthquake proof performances, correcting a weak link and carrying out earthquake proof verification tests. When the error between a measured value of the dry type transformer obtained in the earthquake proof verification test and a theoretical calculated value thereof is in the allowable range, the product design is put on stream. The invention more truly simulates movement conditions of the dry type transformer for nuclear power under the action of random earthquake motion, the structural design of the dry type transformer can satisfy the intensity requirement for earthquake proof requirement response spectrums, the intensity calibration can be carried out by using a virtual prototype, and the earthquake proof test frequency of an object prototype can be reduced. The invention can be applied to the earthquake proof design calculation of all models of dry type transformers for nuclear power and has the characteristics of high development efficiency, low development cost and wide application range.

The invention relates to an artificial seismic wave synthetic method compatible with a multi-damping ratio response spectrum. By adoption of the method, a traditional method is first adopted to generate initial artificial seismic waves and then a time domain adjustment algorithm is adopted to be performed on all periodical control points in turn; an optimization algorithm is adopted to perform fractional step adjustment in a given periodical control point according to the damping ratio number of a target response spectrum so as to realize a minimum root-mean-square error between a multi-damping ratio response spectrum value on the periodical control point of the artificial seismic waves after adjustment and a target multi-damping ratio response spectrum value. The time domain adjustment algorithm is to overlay amplitude modulation simple harmonic time paths on the initial artificial seismic waves, and the amplitude modulation simple harmonic time paths adopt intensity envelope curves which are the same with the initial artificial seismic waves for modulation of the simple harmonic time paths. The algorithm is high in fitting precision and high in calculating speed and is suitable for promotion and application.

A method and apparatus for determining the speed and/or position of an input device from vibrational signals is disclosed herein. In one embodiment, a response spectrum is generated as the input device moves across a surface. Amplitude and frequency data associated with the response spectrum is analyzed to determine the magnitude of the velocity.

The invention discloses a monolithic integrated non-refrigerated infrared/ultraviolet double-color detector and a manufacture method thereof, belonging to the field of photoelectric detectors. The detector comprises a substrate, an ultraviolet sensitive thin film structure and an infrared sensitive thin film structure thereof are integrated on the same substrate material; a cushion layer, an ultraviolet sensitive layer, an isolation layer and an infrared detecting structure are sequentially arranged on the substrate upwardly. In the invention, SiC, GaN series or AlxGa1-xN series of the broad-band gap high-temperature semiconductor ultraviolet sensitive thin film structure and ferro-electricity, vanadium oxide or amorphous silicon of the non-refrigerated infrared sensitive thin film structure grow on the same substrate, and a relative simple material growth method and processing process are adopted to realize the monolithic integration of the non-refrigerated infrared/ultraviolet double-color detector so as to develop the range of a response spectrum, and improve the detection and identification probability of a target; in the application, the invention has no requirement for low temperature, and reduces the volume of parts and the production cost.

The invention relates to earthquake motion synthesis method and system. The method comprises the steps of: determining a multi-damping target acceleration response spectrum and a target peak displacement; obtaining an initial earthquake motion time history; regulating the initial time history through superimposing narrowband time histories to obtain a target earthquake motion time history; and if the target earthquake motion time history meets the set precision requirement, determining the target earthquake motion time history as a final earthquake motion time history to be obtained, or else, returning the former step. The method and the system can be used for synthesizing an artificial earthquake motion time history which can simultaneously meet the earthquake motion peak displacement and the multi-damping earthquake motion acceleration response spectrum, and can ensure the engineering characteristic that the input artificial earthquake motion of nuclear engineering quake-proof design more completely simulates natural earthquake motion, thereby ensuring that nuclear engineering can safely resist the earthquake possibly occurring in the future.

A visible/near-infrared spectrometry and its device for determining the components of a sample and the characteristics of the components of the sample by using visible light and/or near-infrared light in the wavelength range from 400 nm to 2500 nm. This spectrometry and device enable measurement that has been conventionally difficult, including high-accuracy determination of many components, detection of components present in ultra-low concentrations, and real-time determination of component characteristics, including determination of the structure or function of bio-macromolecules and their variations. The spectrum of a sample is measured while exposing the sample to water-activating perturbations (WAP), thereby causing the response spectrum to change, and by detecting transitions of the response spectrum. With this, by conducting spectrum analysis and/or multivariate analysis, the components of the sample and/or the characteristics of the components can be determined.

The invention discloses a gas gun type impact response spectrum testing machine. The testing machine comprises an impact supporting seat, an impact plate, a base, a gas storage tank and an impact tube, wherein the impact supporting seat and the base are fixedly arranged on a foundation, the impact plate is fixedly arranged on the impact supporting seat, the gas storage tank is fixedly arranged on the base and filled with high-pressure gas, a piston valve is arranged in the gas storage tank, the impact tube is vertically located below the impact plate and connected with the gas outlet of the gas storage tank through a connecting bin, a pellet is arranged in the impact tube, and when the piston valve is opened, the pellet has a certain speed to impact the impact plate upwards under the pushing force of the high-pressure gas. The testing machine can simulate high-magnitude impact rapidly and stably, the repeatability and uniformity of the tabletop of the testing machine and the speed control over the pallet are good, and the testing machine is convenient to install, maintain and use.

The invention discloses a black phosphorus/molybdenum disulfide heterojunction-based photodetector, belongs to the technical field of photodetection and aims at solving the problems that a device does not have wide-spectrum, fast and low-noise response characteristics, does not have the compatibility with a CMOS process and is small in volume, easy to integrate and adjustable in response spectrum range. The black phosphorus/molybdenum disulfide heterojunction-based photodetector comprises a silicon dioxide substrate layer, wherein a molybdenum disulfide layer is arranged on the silicon dioxide substrate layer; a black phosphorus conductive layer covers the upper surface of the molybdenum disulfide layer; the black phosphorus conductive layer and the molybdenum disulfide layer form a heterojunctio structure; and a first electrode layer and a second electrode layer are arranged on the black phosphorus conductive layer. The black phosphorus/molybdenum disulfide heterojunction-based photodetector is used for achieving a wide-spectrum and ultrafast-response photodetector.

The invention discloses a dynamic response spectrum-based method for planning a track of a robot with a clearance at a joint. The method plans aiming at a given robot task, plans the spacial track of the joint of the robot among route key points by a motion polynomial function, and obtains a dynamic response spectrum of which the joint counter-force changes along with the change of the time and a track planning variable by using a track time span of each section of a motion track of the robot as the track planning variable. The reasonable track time span can be selected conveniently from the dynamic response spectrum, so that the two members connected by the joint with the clearance are always not separated from each other during the motion of the robot. The method can achieve the effect by only designing a software algorithm to control the track of the robot, without hardware objects such as a spring or counterweight and the like. Through the construction of the dynamic response spectrum with continuous track time spans, the method can guide designers how to select the track time span to avoid the separation of joint elements.

The invention relates to an anti-seismic property probability assessment method based on behavior bispectrum. The anti-seismic property probability assessment method comprises the following steps that1, the anti-seismic property level of an engineering structure is determined; 2, property level displacements for setting a single-freedom-degree system under different property levels are confirmed;3, a simulation test is performed through a single-freedom-degree elastic-plastic differential equation; 4, a behavior earthquake dynamic-inputting spectrum and a behavior response spectrum are respectively obtained; 5, seismic oscillation probability distribution models of each period point and seismic response probability distribution models under different property levels are determined through K-S inspection; 6, probability assessment is conducted on input seismic oscillations under the different property levels; 7, probability assessment is conducted on seismic response accelerations reaching the different property levels; 8, probability assessment is conducted on structural base shear parameters; 9, probability assessment is conducted on a structural seismic action effect. By adopting the anti-seismic property probability assessment method, more scientific and accurate assessment results are provided for the safety of anti-seismic structures at the probability level based on theanti-seismic property level.

The invention relates to the technical field of civil and architectural engineering, in particular to a multi-segment natural ground motion synthesis method based on a set response spectrum. The method includes the following steps: collecting a large number of natural original ground motion records; screening out eligible seismic wave fragments through a specific method; and synthesizing the seismic wave fragments into a synthetic response spectrum closest to a target design response spectrum. The synthesis method follows the principle that the ground motion response spectrum is approximatelyconsistent with the target design response spectrum of the site. The ground motion synthesized can maintain the frequency-domain non-stationary property possessed by a natural ground motion record. The synthesis method is applicable to the anti-seismic analysis of all structure forms under the same fortification intensity and site conditions.

The invention discloses an interval response spectrum method for structural seismic resistance analysis. The interval response spectrum method comprises the following steps of: at first, carrying out time-history response analysis on a great amount of actual measurement data of seismic waves, so as to obtain an actual measurement response spectrum model; secondly, taking an envelope including all actual measurement response spectrums and reacting an interval consisting of a maximum value and a minimum value of an earthquake response spectrum by using the envelope; and finally, solving an earthquake response interval of a structure by using an interval response spectrum. The interval response spectrum method provided by the invention can effectively forecast the response interval of the structure under an earthquake load effect, so as to obtain a more reliable structural earthquake response analysis result; and the invention provides a more effective means for the seismic resistance analysis of the structural response spectrum.

The invention discloses a horizontal impact response spectrometry apparatus. The apparatus comprises an engine base, an impact response platform, a power driving mechanism, a reset mechanism, a buffer mechanism and an impact response spectrum detection apparatus. The power driving mechanism comprises a piston cylinder assembly and an air feed assembly. An air channel control unit is arranged between the air feed assembly and the piston cylinder assembly. The impact response platform comprises an impact platform assembly and a response platform assembly. The reset mechanism comprises a first reset mechanism and a second reset mechanism. The buffer mechanism comprises a first buffer component, a second buffer component and a fixing seat. The impact response spectrum detection apparatus comprises a master control device, an impact spectrum detection module, a response spectrum detection module, a parameter setting unit and a display unit. The design is reasonable, operation is simple and installation is convenient. A device to be tested can be conveniently installed and safety performance is high. An impact spectrum and a response spectrum can be simultaneously detected and an impact environment which needs to be simulated is reached.

The invention provides an engineering structure seismic design method based on displacement. The engineering structure seismic design method based on the displacement includes: determining a design code response spectrum according to initial conditions, and building an elastic displacement response spectrum; determining an initial target displacement shape of an engineering structure; enabling an elastic-plastic multi-degree of freedom system to be simplified into an elastic multi-degree of freedom system; performing modal analysis on the elastic multi-degree of freedom system to obtain a target displacement shape of the engineering structure; enabling the elastic multi-degree of freedom system to be simplified into an equivalent single-degree of freedom system; performing seismic design based on the elastic displacement response spectrum; enabling seismic design force to be assigned to the multi-degree of freedom system according to the principle that the seismic design force is in proportion with elastic stiffness, and performing cross section checking calculation and reinforcement design; and solving novel target displacement, comparing size of target displacement values, and guaranteeing convergence of the target displacement. The engineering structure seismic design method based on the displacement enables displacement response of the engineering structure under seismic effect to be close to designed target displacement, thereby achieving effective control of deformation of the engineering structure under the seismic effect and guaranteeing that the engineering structure has enough displacement capacity.

The invention belongs to the technical field of a liquid crystal device. In order to provide a high-resolution liquid crystal light valve and a preparation method thereof, the liquid crystal light valve provided by the adopted technical solution comprises a first glass substrate and a second glass substrate which are oppositely arranged, wherein a first transparent conducting thin film layer and a second transparent conducting thin film layer are arranged on the opposite side faces of the first glass substrate and the second glass substrate respectively; a photosensitive layer, a light-stopping layer, a medium reflector, a first alignment layer, a liquid crystal layer and a second alignment layer are further sequentially arranged between the first transparent conducting thin film layer and the second transparent conducting thin film layer; the photosensitive layer is a photosensitive layer in a nanometer structure, which is made of an a-Si:(CdTe):H composite material; the composite material comprises CdTe and a-Si:(CdTe), wherein the CdTe is 7% in content. A less amount of the CdTe is mixed into an a-Si:H thin film to form the a-Si:(CdTe):H composite material; the material is used as the photosensitive layer of the liquid crystal light valve, so that the migration rate of semiconductor materials of the photosensitive layer is improved, the response time is shortened, the resolution ratio and the light sensitivity of the liquid crystal light valve can be improved, and the response spectrum is widened. The technical solution is applicable to the existing reflection type liquid crystal light valve.

The invention provides an optimum design method for a gap between the movable part and the static part of a centrifugal pump. The optimum design method comprises the steps of using a value calculation method of combining a response spectrum with fluid-structure interaction, and considering an earthquake force and a fluid excitation force simultaneously to obtain quantitative deformations at an impeller opening ring and an impeller outlet in the multi-operating mode of a residual heat removal pump. The law of deformation between the movable part and the static part in the multi-operating mode of the residual heat removal pump is obtained by virtue of the calculation of combining the earthquake response spectrum with fluid-structure interaction, and by using the method of considering the influence of the earthquake force and the fluid excitation force on an impeller, so as to optimize the design for the gap between the movable part and the static part of the residual heat removal pump. The method is based on an earthquake response spectrum analysis and a fluid-induced vibration analysis, thus the design for the gap between the movable part and the static part of the centrifugal pump for nuclear power is more reasonable, a more accurate calculation result is provided for the structural design for the centrifugal pump, and novel design thinking and method are provided for the optimum design for the centrifugal pump structure for nuclear power.