173 results about "Performance design" patented technology

An air conditioning unit may be controlled based on an index of performance designed to quantify re-circulation levels. For the air conditioning unit control, an index of performance set point is determined and the index of performance for a first iteration is measured. In addition, it is determined whether the measured index of performance for the first iteration equals or exceeds the index of performance set point. Moreover, a supply air temperature of the air conditioning unit is increased in response to the measured index of performance for the first iteration equaling or exceeding the index of performance set point.

A method, system and program are provided for dynamically reconfiguring a pipelined processor to operate with reduced power consumption without reducing existing performance. By monitoring or detecting the performance of individual units or stages in the processor as they execute a given workload, each stage may use high-performance circuitry until such time as a drop in the throughput performance is detected, at which point the stages are reconfigured to use lower-performance circuitry so as to meet the reduced performance throughput requirements using less power. By configuring the processor to back off from high-performance designs to low-performance designs to meet the detected performance characteristics of the executing workload warrant, power dissipation may be optimized.

The present invention belongs to the technical field of concrete construction and particularly relates to a design method for a mixing proportion of a self-compacting concrete mixture. The method comprises the steps of: determining a performance design target; determining mixing strength and a water-binder ratio; determining densest gradation (or a sand rate) of aggregates and void ratios of different packing states; determining the usage amount of binding materials and mixing water; determining the usage amount of the aggregates; determining the usage amount of additives; determining the actual adding amount of the mixing water; and the like. According to the method provided by the present invention, aimed at blindness of material selection during self-compacting concrete mixing proportion design in the prior art, based on a fundamental theory of particulate dense packing and a composition rule of reaching a densest packing state of solid particulate materials with different particulate diameters, a mixing proportion of different materials is determined by an actually measured densest packing state, and relationships are established between the material mixing proportions corresponding to different densest packing states and expected self-compacting performance grades of the mixture, so that the design method used for the mixing proportion of the self-compacting high-performance concrete mixture and based on a use performance as a target is constructed.

The invention belongs to the field of motor optimization designs, and relates to a multi-objective hybrid particle swam optimization design method for a double-fed wind power generator. The method comprises the following steps of: (1) determining a constraint condition and a to-be-optimized design variable of the double-fed wind power generator, and establishing sub-objective function equations to form a multi-objective function; (2) constructing variable space by using the to-be-optimized design variable, and constructing non-dominated solution sets of population according to the quality of an objective value; (3) ordering the non-dominated solution sets according a Pareto domination mechanism, determining a population niche by taking a non-dominated solution as a core, establishing a particle speed updating mechanism and finally obtaining an optimal design scheme; manufacturing a mode machine according to the optimal design scheme, inspecting an actual operation index of a motor, and comparing the actual operation index with an index given by the design scheme; and if the actual operation index exceeds a requirement range of operation indexes, adjusting a performance design scheme. Due to the adoption of the motor optimization design method provided by the invention, overall economic benefit and wind energy utilization rate of a wind power generating system can be improved.

The invention belongs to the field of civil engineering, and relates to an assessment method for seismic design of engineering structures. The method includes the following steps that (1) the design intensity, a performance level, a performance objective and a structure scheme are determined, and bearing capacity design and section reinforcement and capability structure design under the effect of frequent earthquakes are conducted according to earthquake resistant codes; (2) the number of vibration modes is determined according to a vibration mode participation quality factor; (3) seismic oscillation at the performance level is determined on the basis of the performance level and an equivalent single-degree-of-freedom model of each vibration mode, and a seismic oscillation-seismic demand quantitative relation is established; (4) the seismic demand is obtained, and modal reactions are determined through a square and square root extraction combination or a complete secondary vibration mode combination; (5) after the vibration modes response to the combination, structural displacement is conducted, and whether the requirements of top displacement, inter-story displacement and the component performance objective are met or not is judged; and (6) the seismic oscillation level is predicted and assessed under multiple performance levels. The new method and new idea for assessment of the seismic performance design are provided.

The invention discloses a self-resetting beam column friction energy dissipation joint structure and a construction method thereof. The self-resetting beam column friction energy dissipation joint structure comprises a steel column, a middle beam, short beams, connecting plates, a brass friction plate, spring baffles, high-strength anchor rods and disc springs. One ends of the short beams are fixedly connected with the flanges of the side wall of the steel column, and a gap exists between the middle beam and the short beams; one ends of the connecting plates are fixedly connected with the webof the middle beam, and the other ends are hinged to the webs of the short beams; the brass friction plate is arranged between the connecting plates and the webs of the short beams; one ends of the high-strength anchor rods penetrate through the spring baffles, and the other ends of the high-strength anchor rods penetrate through the two flanges of the steel column and are fixed. The spring discsare sleeved on the high-strength anchor rod on one side, far away from the steel column, of the spring baffles. Structural construction is completed through basic construction, small earthquake testing, parameter selection, node performance design and large earthquake inspection. According to the invention, the formation of a plastic hinge of a traditional steel frame beam-column joint is effectively avoided, the beam column joint is not damaged or slightly damaged under the action of a large earthquake, and the post-earthquake joint can be put into use without repair.

The invention discloses a method for extracting optical fiber gyro random error characteristics based on wavelet variance, comprising the following steps of: firstly carrying out an outlier eliminating process on an angle speed information xt-0 output by an optical fiber gyro, to obtain the angle speed information xt without the outliers, and then processing the xt by using a dispersed wavelet conversion to obtain a dispersed wavelet conversion coefficient dj, Tau under different decomposition scales, and then carrying out a variance process on the dj, Tau to obtain the wavelet variance Sigmax2 (Tau) from a low frequency band to a high frequency band under each scale factor Tau, and finally carrying out a double logarithmic curve fitting of the wavelet variance Sigmax2 (Tau) and the scale factor Tau by using a random error source variance quadratic sum relationship to extract five random error coefficients including N, B, K, R and Q in the angle speed information output by the optical fiber gyro. The invention can realize more precise analysis of the optical fiber gyro random error characteristics, thereby providing guidance for improving the performance design of the optical fiber gyro and compensating the random errors.

The invention discloses a user behavior-based method for optimizing building energy conservation design in severe cold areas. The method comprises the following steps of: aiming at special weather conditions in severe cold areas, carrying out analysis by utilizing survey data so as to obtain a building design parameter set of actuating energy conservation behaviors; learning behavior measured data by applying a machine learning algorithm in a data mining technology so as to obtain a more correct user random behavior mode; obtaining an optimization energy conservation performance design parameter set through a behavior mode optimization traditional prediction model and a Bayesian theory-based Gaussian process correction prediction model; coupling the actuating energy conservation behaviors and the optimization energy conservation performance design parameter set to obtain an optimized parameter set; and finally combining an optimal design parameter set and an energy consumption prediction model to establish a new process for building energy conservation design in the severe cold areas. According to the method disclosed by the invention, the influences, on the prediction models, of uncertainty can be reduced, and a more optimal parameter screening process, more correct energy conservation effect prediction, a more rational building energy conservation design process and a more correct estimated building design result can be obtained.

The present invention relates to a prestress type steel-concrete structure design, and belongs to the field of civil engineering. The prestress type steel-concrete structure using performance design method is characterized by: considering constraint and distribution thereof, wherein the using performance design during structure construction designing comprises calculating deflection of a frame beam under a normal use limit state and carrying out checking computation on a maximum crack width of the frame beam. Considerations of the constraint and the distribution thereof are the entity generated by the internal forces, the constraint causes the influence of the secondary axial force, such that the prestressed frame beam becomes a tension bending member from a flexural member so as to impact deflection and crack width of the prestressed frame beam. With the calculation formula of the design method provided by the present invention, the influence of the secondary axial force is considered, and the prestress type steel-concrete structure design theory is quantitatively established by using a constraint viewpoint.

The invention provides a building indoor path finding element visual saliency evaluation system and method based on virtual reality and eye movement tracking, and the system comprises a virtual reality generation module which establishes a building indoor three-dimensional virtual model based on investigation data; The display and control module is used for displaying a preset environment scene and realizing man-machine interaction; The data acquisition and recording module is used for capturing various tested index data in real time by using eye movement tracking equipment; And the data processing and analyzing module is used for calling the building design influence factor parameter set and the eye movement data to construct a building indoor path-finding element visual saliency prediction model so as to realize visual saliency evaluation on related environment elements. According to the method, the accuracy of user path-finding navigation decision prediction can be improved, the visual saliency parameters are reasonably introduced, the building indoor evacuation simulation algorithm model is optimized, and more effective suggestions are provided for building performance design.

The invention relates to an optimizing method of an analogue integrated circuit design, belonging to the field of automation of integrated circuit designs. The optimizing method comprises the following steps of: inputting a circuit network table, performance design indexes and a performance test circuit; determining a target optimization value of each index item of circuit optimization based on an equation, an optimization value of each index item of the circuit optimization based on a circuit simulator after eliminating the self parasitic effect of a device, and an optimization value of eachindex project of the circuit optimization based on the circuit simulator after taking the physical connection parasitic effect of the circuit into account; executing the circuit optimization based onthe equation; executing the circuit optimization based on the circuit simulator; and carrying out the circuit optimization based on the circuit simulator. According to the optimizing method of the analogue integrated circuit design disclosed by the invention, the reliability of circuit evaluation is improved, and the optimization speed is increased, thus the zone times between the circuit design and the physical design is reduced, the design efficiency is improved and the design cycle is shortened.

The invention discloses an inside engaged gear tooth form design method based on a B-spline engaging line. According to the method, an inside engaged gear engaging line is constructed by using b-splines according to the freedom and flexibility of b-spline curves constructing complex curves; according to the gear engagement principle, an inside engaged internal and external gear conjugate tooth profile curve satisfying the engaging line is constructed, and the engagement performance of the inside engaged internal and external gear conjugate tooth profile curve is analyzed; with the goal of the smoothness of the engaging line and the engagement performance of the conjugate tooth profile, optimized design of the conjugate tooth profile is carried out; and a tooth root transition circular curve from the tooth profile curve to a root circle is constructed, and the overall tooth design of an inside engaged gear is completed. Through the engaging line designed through the method, the engagement performance of the constructed conjugate tooth profile can be solved before construction of the conjugate tooth profile. According to the method, the engaging line constructed by the B-splines is utilized, and the shape of the engaging line can be adjusted conveniently by changing position coordinates of a control vortex. Thus, the method has great freedom in geometrical shape design and the engagement performance design of the inside engaged gear conjugate tooth profile.

A method, system and program are provided for dynamically reconfiguring a pipelined processor to operate with reduced power consumption without reducing existing performance. By monitoring or detecting the performance of individual units or stages in the processor as they execute a given workload, each stage may use high-performance circuitry until such time as a drop in the throughput performance is detected, at which point the stages are reconfigured to use lower-performance circuitry so as to meet the reduced performance throughput requirements using less power. By configuring the processor to back off from high-performance designs to low-performance designs to meet the detected performance characteristics of the executing workload warrant, power dissipation may be optimized.

The invention provides a method for designing the train body anti-collision performance of a long-numbered motor train unit with the speed per hour of 350 kilometers and relates to the technical fieldmotor train unit train body anti-collision performance design. The method includes three parts of head vehicle energy absorption design, middle vehicle energy absorption design and energy absorptiondesign of each collision interface. According to the method, energy absorption elements are adopted to finish the energy dissipation process step by step in a controllable mode, the requirement of static strength of a train body, the available space of a head vehicle, the influence of the minimum compression amount of air dampers of middle vehicles on the energy absorption elements and the designed energy absorption amount of each the collision interface are fully considered, and the EN15227 standard requirement is met after one-dimensional simulated analysis validation. The energy absorptionamount distribution scheme of the method is firstly researched and developed for sixteen grouped long-numbered motor trains, the energy absorption amount of each the collision interface is distributedreasonably, and reference is provided for research and development of the anti-collision performance of train bodies of other long-numbered motor trains.

The invention discloses a front longitudinal beam anti-collision performance design method for a passenger vehicle and aims at solving the problems that when the traditional trial-and-error method is used for designing the front longitudinal beam of a car in the prior art, a computer simulation model needs to be repeatedly modified, the testing needs to be repeatedly carried out, and the like. The front longitudinal beam anti-collision performance design method for the passenger vehicle comprises the following steps that 1, the average crushing counter force expression (shown as the accompanying drawing) of a multi-right-angle cross section thin wall beam is deduced, in the expression, Pm is the average crushing counter force, the unit of the Pm is kN, n is the number of the cross section right angles of the multi-right-angle cross section thin wall beam, M0 is the unit length plastic limit bending moment, the unit of M0 is N.mm, l is the cross section circumference of the multi-right-angle cross section thin wall beam, the unit of the l is mm, h is the wall thickness of the multi-right-angle cross section thin wall beam, and the unit of the h is mm; 2, the cross section of the crushing deformation part of the front longitudinal beam is designed; 3, the average bending moment expression (Mm=(0.3-0.5)Mmax) of a rectangular cross section thin wall beam is deduced, in the expression, Mm is the average bending moment of the rectangular cross section thin wall beam, and the unit of the Mm is N.mm; and 4, the cross section of the bending deformation part of the front longitudinal beam is designed.

The invention discloses a real-time vertical wheel impact force measurement method based on tire pressure monitoring. Integrated equipment with a tire pressure derotation preprocessing module, a tire pressure-wheel force system identifying module, a calibrating and correcting method module and a tire pressure-wheel force measuring module is mainly included. Real-time tire pressure data is collected through the integrated equipment, corresponding vertical wheel impact force is obtained through the derotation preprocessing module and the tire pressure-wheel force system identifying module, and correction can be conduced according to a calibrating method. Accordingly, a wheel force measurement solving scheme which is efficient, accurate and high in adaptability is provided from the theory layer and the equipment layer, the quick assessment requirement on vast bridge health condition is met, and meanwhile the method has the great potential in the fields of road safety diagnosis, vehicle performance design and the like.

A computer-implemented method of overseeing and adjusting the instruction and evaluation of a student with respect to one or more topics of study within a classroom. The subject matter of an academic course is studied and broken down into a plurality of discretely defined behavioral performances designed to be readily and objectively recognized as being mastered or not by a student. One or more of the discretely defined behavioral performances are then selected, with the aid of a first computerized database system, as learning objectives for the week. At the end of the week, a student is subsequently evaluated on these objectives. Results of the evaluation are then transferred to a second computerized database system, which organizes the collected data into an interactive learning management report that can be configured by a reviewer in real time to display a variety of levels of detail.

The invention discloses a method for establishing probability models of fatigue failure probability and fatigue life probability of a cement-based material in consideration of a stress level. Based on the quasi-static loading strength and the fatigue life at different stress levels of cement-based materials, the fatigue life probability model of the cement-based materials can be obtained easily and quickly. On the one hand, the model can predict the fatigue failure probability of the cement-based materials and structures using the cement-based materials by the number of fatigue load cycles. On the other hand, the fatigue life of the cement-based materials and structures can be calculated by setting the fatigue failure probabilities, which provides a new way and a new method for the fatigue performance design and service condition detection and evaluation of the structure under fatigue load.

The invention discloses a dish washing machine which comprises a washing machine liner, an upper shelf and a lower shelf and further comprises a third shield. The third shelf can be separated from the liner movably and is selectively arranged between the upper shelf and the lower shelf and / or on the upper portion of the upper shelf. The dish washing machine is characterized in that the third shelf is added on the basis of the original upper shelf and lower shelf, the placement space of a chopsticks box and a knife fork frame can be saved, and the internal space utilization rate of the scrubber is improved. By means of the third shelf, more placement modes can be provided for a customer for select, and the problem that tableware cannot be placed is solved. By means of reasonable structure and performance design, the third shelf can be placed between the upper shelf and the lower shelf and arranged above the upper shelf for user to select. The dish washing machine provides diversifying selection and highlights the high-end performance and the difference of the dish washing machine.

The invention discloses nano aerogel heat insulation waterproof intermediate coating and a preparation method thereof. The nano aerogel heat insulation waterproof intermediate coating contains the following components in parts by mass: 25-45 parts of pure acrylic elastic waterproof emulsion, 0-2 parts of titanium dioxide, 15-25 parts of nano aerogel, 0.7-1.3 parts of a coalescing agent, 3.2-3.8 parts of a dispersing agent, 0.4-0.6 part of a defoaming agent, 2.5-3.5 parts of cellulose, 0.07-0.13 part of a preservative and 19.4-52.4 parts of water. After the coating is applied to a reflective heat insulation coating intermediate coating, the heat insulation and reflection effects of the whole coating can be improved, thermal performance design requirements are met, construction is convenient, and efficiency is greatly higher than that of heat preservation putty, so that labor cost can be greatly saved.

The invention discloses a method for establishing a cement-based material fatigue failure probability and fatigue strain probability model capable of considering loading frequency. On the basis of the quasi-static loading failure strain of the cement-based material and the fatigue failure strain of the cement-based material under different loading frequencies, the cement-based material fatigue strain probability model can be conveniently and quickly obtained. On one hand, the model can predict the cement-based material and the fatigue failure probability of a structure which uses the cement-based material through fatigue strain, on the other hand, the fatigue strain of the cement-based material and the fatigue strain of the structure are calculated through the setting of the fatigue failure probability, and a new approach and a new method are provided for the service condition detection and assessment of the structure under the fatigue performance design and the fatigue loading of the corresponding structure.

The invention discloses a backstepping-sliding mode control unit and method for controlling precision of a multi-axis linkage system and aims to control nonlinear characteristics of the multi-axis linkage system carried on a floating platform. The method is mainly technically characterized in that an electromechanical coupling dynamical model of the multi-axis linkage system is established based on Lagrange-Maxwell dynamics; according to the dynamical behavior requirements of the multi-axis linkage system carried on the floating platform under specific dynamical conditions, the method for an MIMO (multiple input multiple output) system is provided; the control unit of the multi-axis linkage system carried on the floating platform is designed, and performance simulation is performed. The method has the advantages that a new concept of dynamical performance design for the multi-axis linkage system in the non-typical dynamical environment is provided, control robustness is good, hardware implementation is easy and the method has engineering value.

The invention discloses ionic liquid of N-methyl piperazine salt. The ionic liquid has the structural general formula shown as the specifications. The invention also discloses a preparation method for the ionic liquid. N-methyl piperazine and Y acid are subjected to one-step reaction to directly form the ionic liquid of N-methyl piperazine salt. The method has the advantages of simple operation, wild reaction condition, high yield and product purity, simple storage and transportation, and suitability for industrial production; and in the produced ionic liquid of N-methyl piperazine salt, anions have plenty of selection spaces and structure and performance design spaces, and the ionic liquid can be applied to multiple fields.

The invention belongs to the technical field of petroleum and natural gas engineering shaft integrity and discloses a visible evaluation device and method for shale gas well multi-stage fracturing cement sheath air-tight seal integrity A full process of crack initiation, expansion and connection of a cement sheath after shale gas well multi-stage fracturing is simulated; a visible evaluation leakage channel is quantified and leakage speed rate is calculated; and a basis for shale gas well multi-stage fracturing parameter optimization and cement mortar performance design can be provided. The visible evaluation device is simply structured and easy to operate; the process of crack initiation, expansion and connection of the interior and the gluing surface of cement sheath after shale gas well multi-stage fracturing can be simulated and visible description can be conducted; the visible leakage channel can be led to CFD software and gas leakage speed can be calculated; with a combination of a leakage detection device, reliability of a test result can be verified; a theoretical basis can be provided for the shale gas well multi-stage fracturing parameter optimization and cement mortar performance design; and low labor intensity, short time consumption and high work efficiency can be achieved.

The invention relates to a reflective insulation energy-saving coating for the external surface of a building. The coating is characterized by comprising the following components in percentage by weight: 15 to 45 percent of deionized water, 0.5 to 5 percent of dispersing agent, 16 to 36 percent of rutile type titanium dioxide, 3 to 35 percent of insulation powder, 0.1 to 3.5 percent of wetting agent, 0.5 to 2 percent of auxiliary film forming anti-freezing aid, 1.5 to 7.8 percent of film forming aid, 0.1 to 1.8 percent of antifoaming agent and 0.5 to 2.5 percent of thickening agent. The reflective insulation energy-saving coating for the external surface of the building effectively resists radiation of heat energy produced by sunlight and is an energy-saving and environment-friendly product; meanwhile, the preparation process flow for the coating is simple, complex equipment is not needed, large-scale processing production is easy to implement, the preparation process is environment-friendly, the conventional insulation system can be partially or completely replaced through thermal performance design calculation, and the potential fire hazard of an external wall insulation system is eliminated.

The invention discloses a high temperature resistant radar wave absorption material based on double-layer metamaterials. The high temperature resistant radar wave absorption material comprises, from inside to outside, an inner dielectric layer, an inner layer resistance type high temperature metamaterial layer, an intermediate dielectric layer material layer, an outer layer resistance type high temperature metamaterial layer, and an outer layer dielectric layer sequentially. The resistance type high temperature metamaterial layer comprises conductive phase substances and glass base materials. The inner dielectric layer, the intermediate dielectric layer material layer, and the outer layer dielectric layer adopt continuous oxide fiber reinforcement oxide composite materials. In order to satisfy the electric performance design requirement of the resistance type high temperature metamaterials, the mass ratios of the conductive phase substances and the glass base materials of the resistance type high temperature metamaterials are in a range from 30:70 to 70:30. The high temperature resistant radar wave absorption material is advantageous in that strong designability is provided, and a structure is simple; by adopting a double metamaterial technology, broadband wave absorption performance is realized.

The invention relates to a design method for improving anti-collapse ability of an RC frame core tube structure. The method comprises: (1) according to established conditions, carrying out conventional design on the RC frame core tube structure to obtain an initial model; (2) selecting a concrete frame or a shear wall key part to carry out failure processing, carrying out static response analysis on the overall structure to assess the collapse state of the overall structure by using finite element software LS-DYNA; (3) if the frame core tube structure does not collapse in step (2), applying dynamic loads continuously, and carrying out analysis on the overall collapse process to assess the collapse state of the overall process; (4) repeating step (2) and step (3) for the remaining key parts so as to obtain response of the frame core tube structure of each key part under the failure state; and (5) carrying out performance design on the RC frame core tube structure, so as to improve the anti-collapse ability of the RC frame core tube structure. According to the method disclosed by the invention, by analyzing of the overall collapse process, whether the RC frame core tube structure collapses or is damaged can be intuitively and clearly determined without using the collapse determination criterion, and the collapse mechanism can be understood and then anti-collapse design can be carried out.