94results about How to "Guide design" patented technology

The invention relates to a method for determining the development position of a fractured-vuggy carbonate reservoir, which comprises the following steps: carrying out fine calibration on the fractured-vuggy carbonate reservoir by using the three-dimensional conventional seismic data of great deserts; and carrying out color filling and waveform display on a wave trough and a wave crest by using a seismic-section display method, wherein the color filling is performed according to the vibration amplitudes of the seismic wave trough and the seismic wave crest; and after a wiggle variable area display mode is selected, and determining the transverse development position of the fractured-vuggy carbonate reservoir and the variation situations of the fractured-vuggy carbonate reservoir through observing the waveform changes corresponding to the fractured-vuggy carbonate reservoir calibrated on a seismic profile and the color change relations after the area is changed, wherein same waveform and same filled color after the area is changed instruct a same physical development zone of the reservoir. By using the method of the invention, the development position of the fractured-vuggy carbonate reservoir can effectively be determined, the design on horizontal well paths is guided in actual applications, and all completely-drilled horizontal wells can produce high-capacity oil-gas flows.

In a software quality evaluation system, evaluation personnel evaluate a software quality according to a predetermined quality evaluation system; but the changeless quality evaluation system can not adapt to different stages of a software product. The present invention provides a method for evaluating a software quality. The method comprises: selecting a software evaluation model; selecting each quality index of a software quality evaluation based on the selected software evaluation model so as to establish a quality evaluation system; collecting data for each quality index; determining weight values of each quality index based on the collected data; determining scores of each quality index based on the collected data; and determining a score of the software based on the scores and weight values of each quality index so as to evaluate the software quantity. According to the method for evaluating a software quality provided by the present invention, a software quality evaluation system can better adapt to different stages of software development, and better meet the actual requirements of a client.

The present invention provides a method and system for evaluating and tracking a software quality. The method comprises: selecting a software evaluation model; selecting each quality index of a software quality evaluation based on the selected software evaluation model so as to establish a quality evaluation system; collecting data for each quality index of latest version software and saving the data; determining weight values of each quality index based on the collected quality index data of the latest version software; determining scores of each quality index of software of the version based on the collected quality index data of software of every version; and determining quality scores of software of each version according to the weight values of each quality index and scores of each quality index in software of every version, so as to determine a change tendency of software qualities of each version. According to the method and system for evaluating and tracking a software quality provided by the present invention, software qualities of different versions can be dynamically and objectively evaluated and can be tracked, thereby better guiding design and development directions of software.

The invention discloses a method for evaluating the perfume style of cigarettes, which relates to the measuring method of cigarette qualities. The invention uses a contour evaluating method, and establishes multi-dimension cigarette style characteristic contour evaluation from the two aspects of a quality index and a characteristic index, the five contours of basic feeling, fragrance characteristics, perfume characteristics, chemical quality indexes, chemical characteristic indexes, etc., and 46 basic factors. The establishment of the method provides an evaluating method of direct image and convenient operation for determining the perfume style of the cigarettes.

The invention provides a long carbon fiber and metal composite continuous casting machine and process, relates to the field of metal materials and aims to solve the problem that existing long carbon fiber and metal composite material is poor in performance. The machine comprises a carbon fiber paying-off and pre-tightening device, a guide wheel, a carbon fiber paying-off device support, a carbon fiber position corrector, a carbon fiber protecting tube, a carbon fiber position corrector support, a metal temperature-controlled furnace, a frame, a crystallizer, a bottom carbon fiber fixing and position-correcting device and an ingot guide mechanism. The process includes the steps of paying off, stringing, metal melting, and drawing and compositing. The machine and the process according to the embodiments are used for composite continuous casting of high-performance long carbon fiber and metal.

The invention discloses a straightness recession computing method for a lathe guide rail pair under random abrasion working condition. The method comprises the following steps: based on an Archard abrasion principle, computing a single-point abrasion depth equation of the lathe guide rail pair while the load and speed random effects are considered; based on a random principle, computing a maximum abrasion depth model of the lathe guide rail pair while the feed length random change is considered; according to the single-point abrasion depth equation of the lathe guide rail pair while the load and speed random effects are considered, substituting the maximum abrasion depth model of the lathe guide rail pair while the feed length random change is considered, computing a straightness recession computing model of the lathe guide rail pair, and considering the effect of the lathe working condition to the precision of the guide rail pair according to the straightness recession computing model. The method is capable of making up the deficiency of the current computing method that the effect is not adequately considered, and is good for optimizing the precision computing result of the guide rail pair. The contact surface abrasion form of the guide rail pair and the evolutionary process thereof are comprehended deeply, so the design and application of the lathe processing technology are guided better.

The invention discloses a module-level error analytic control method for a phased array antenna system, which belongs to the technical field of electronics. The method comprises the following steps of: first, determining initial values of each module error according to a phased array system error analytic control probability model; then, establishing a numerical experiment model according to an amplitude-phase error of each module and an active unit directional diagram; next, generating a numerical test matrix; and finally, outputting a phased array antenna system error analytic control result meeting an expected requirement in a numerical experiment mode. The method finally guides a module design and an overall system design effectively by effectively regulating and controlling various types of errors of a system based on each of module errors and an interconnection mismatch influence among the module errors; and in reverse, the method also can evaluate performance indexes such as anarray minor lobe level of the phased array antenna system, a 3dB beam width, the gain loss of an array, beam-pointing accuracy and the like according to actual amplitude-phase errors of modules, and a system error caused by the interconnection mismatch of each of modules.

The invention discloses a Calculation Method of Temperature and Humidity Distribution of Three-Dimensional Switchgear Based on Electromagnetic-Temperature-Humidity Coupling. The method comprises the following of construction of the three-dimensional computational model include adopting simplified switch cabinet structure and using structured mesh generation to improve the accuracy and efficiency of computation; (2) Electromagnetism is considered in the calculation The temperature distribution inside the switchgear caused by the Joule heat is calculated by using the large current flowing through the conductor, which is consistent with the actual operating condition of the switchgear. (3) Temperature is taken into account in the calculation In the coupled process of humidity field, the influence of humid air diffusion is considered in the calculation of temperature distribution. In the humidity calculation, the influence of temperature distribution is also considered. The calculation result of the invention can display the temperature and humidity distribution inside the switch cabinet in real time, and can provide guidance for the optimization design of the switch cabinet.

The invention discloses a cutting-tool wear evaluation and prediction method and system based on generalized wear extent. The method and the system can be used for supplementing shortages of the existing one-dimensional and two-dimensional measurement and evaluation methods and are beneficial to the optimization of a cutting-tool wear measurement and research process and the deep understanding of a cutting-tool wear pattern and an evolutionary process thereof, and thereby better instructing the design and use of cutting tools. The method comprises the following steps: (S1) acquiring wear state data of sampling points of a cutting tool in different sampling time periods, fitting the wear state data so as to obtain a state function of the sampling points of the cutting tool, and determining the generalized wear extent according to the state function; (S2) calculating cutting-tool wear evaluating indicators and a generalized wear rate based on the generalized wear extent; (S3) evaluating cutting-tool wear conditions according to the cutting-tool wear evaluating indicators, and predicting the cutting-tool wear conditions according to the generalized wear rate.

The invention discloses a design method based on topology structures for a condition criterion wireless energy transmission system. The design method comprises the following steps of: firstly, analyzing the different topology structures from an angle of an equivalent circuit so as to acquire an expression of the optimal transmission efficiency of the transmission system in the different topology structures; secondly, defining a condition criterion related to load resistance, transmission distance, resonance frequency and coil sizes; and finally, calculating the condition criterion according to specific parameters when the wireless energy transmission system actually applied is designed, and selecting suitable topology structures for the wireless energy transmission system according to the condition criterion so as to acquire the optimal transmission efficiency. According to the design method, the topology structures for the wireless energy transmission system can be fast, conveniently and effectively designed according to the value of the condition criterion, so that the optimal transmission efficiency of the system is acquired.

The invention discloses a design method of a well cementation annulus slurry column structure. The design method comprises following steps: calculating the maximum pressure Pmax applied on the stratum by an annulus slurry column, wherein the maximum pressure Pmax is the pressure generated when the slurry is displaced in place during the well cementation construction; calculating the minimum pressure Pmin applied on an oil gas bed by the annulus slurry column, wherein the minimum pressure Pmin is the pressure generated when the rapidly cemented cement slurry loses weight during a cementing process; and determining whether the annulus slurry column structure is reasonable according to the maximum pressure Pmax and the minimum pressure Pmin. According to the design method, various pressures related to the annulus slurry column structure can be quantitatively calculated and contrasted, and the determined slurry column structure can stably press the oil gas bed and can prevent the leakage of the stratum. The design method is more scientific and reasonable.

The invention particularly relates to a method for setting up drainage blind ditches in a large-scale landfill site in a loess hilly and gully region. A primary blind ditch is set up in a valley withbig catchment area and large flow volume, a secondary blind ditch is set up in a small gully, and drainage branch blind ditches are set up at spring eyes, structure water outlet points or other percolation points. The stratum positions of the blind ditches are set at the interface between a soil layer and a bedrock; the terrain positions of the blind ditches are selected based on that the primaryblind ditch should be set up along the bottom of the valley and the secondary blind ditch and the branch blind ditches should be prevented from excessive changes in slope as much as possible. The slope of the blind ditches is set to not less than 0.5%, and for a steep part with a big slope, vertically connected blind ditches are adopted. A geotextile covers the full cross-sections at the inlets ofthe blind ditches, and at the same time, stones are filled within 2m of the inlets of the blind ditches. The outlets of the blind ditches are subjected to special reinforcement according to the terrain. The method can guide the design and construction of the blind ditches in more detail and is more suitable for the large-scale landfill site in the loess hilly and gully region.

The invention relates to the field of design of ship structure, and provides an extreme load determining method considering multi-span instability of the longitudinal keel caused by lateral load action. The method comprises the following steps of using the lateral movement of a transverse beam or a rib plate caused by whole deformation of a plate frame as an initial defect, introducing into a calculating model of bending and flexibility of single-span longitudinal keel, and establishing a calculation model of extreme load of the multi-span instability of the longitudinal keel which simultaneously endures longitudinal axial force and lateral pressure; solving a differential equation, so as to obtain a longitudinal keel additional eccentric center caused by lateral movement of the transverse beam; giving a calculation formula of the extreme load of the multi-span instability of the longitudinal keel enduring the lateral pressure action. By adopting the technical scheme, the method has the advantages that the influence rule of the extreme load of the multi-span instability of the longitudinal keel girder column of a ship under the action of lateral load is disclosed, so as to guide the design of the extreme load of the plate frame.

The invention discloses a generalized state space averaging modeling method for an aviation 12-pulse inverter. The generalized state space averaging modeling method comprises the following steps: acquiring the virtual line voltage, the virtual line current and the switching function of the 12-pulse inverter of an airplane electric power system; acquiring generalized state space averaging analysis variables by taking the virtual line current and the virtual line voltage as analysis variables, and acquiring an equivalent function of the switching function; and acquiring a generalized state space averaging model of an aviation 12-pulse inverter circuit according to the generalized state space averaging analysis variables, the equivalent function of the switching function, and a generalized state space averaging theory. Taking not only invariant components but also high-order components into consideration, the generalized state space averaging modeling method is suitable for stability analysis of not only low disturbances of airplane electric power systems, but also high disturbances of the airplane electric power systems. Compared with a state space averaging model, the generalized state space averaging model has a lower deviation of about 3% decreased from 6%, and the accuracy is almost doubled.

The invention relates to a method for evaluating the B10 reliable life of a mechanical part of a vehicle engine. The method comprises the following steps: selecting a mechanical part, which is subjected to B10 reliable life evaluation, of the vehicle engine; sequentially determining a mission profile of the vehicle engine corresponding to the mechanical part of vehicle engine, a load action process parameter, a main failure mode, a stress cumulative distribution function, a probability density function of initial strength, a change rule of residual strength along with the trip distance of a vehicle and the like; and substituting the parameters into a B10 reliable life model so as to determine the B10 reliable life of the mechanical part of the vehicle engine without depending on a great number of life data. By the method, the B10 reliable life of the mechanical part of the vehicle engine can be determined at the design stage of the mechanical part of the vehicle engine, design, test and use of the mechanical part of the vehicle engine can be guided well, the development and research efficiency of the vehicle engine and the mechanical part thereof can be improved, the development period is shortened, and the development cost is saved.

The invention discloses a shale uniaxial compressive strength evaluation method based on a rock debris micro-nano indentation experiment, and the method comprises the following steps: collecting rockdebris of a target shale reservoir, and treating the surface of a rock debris sample by adopting a three-ion beam cutting instrument, so that the surface becomes a flat and smooth high-quality section; carrying out a rock debris micron or nano indentation experiment on the treated rock debris sample to obtain a plurality of groups of indentation experiment load displacement curve graphs; and calculating the shale uniaxial compressive strength of the shale reservoir. According to the method, the shale debris micro-nano indentation experiment is carried out, indentation load depth curves under different scales are obtained, micromechanics parameters of shale are obtained through calculation, a relation model between uniaxial compressive strength and the micromechanics parameters is established, prediction of macromechanics parameters of shale is achieved, and the method is suitable for large-scale popularization and application. Therefore, shale mechanical parameters of the shale horizontal well are accurately obtained; basic parameter bases are provided for drilling, well completion and hydraulic fracturing of the shale gas horizontal well, and design and construction of drilling, well completion and hydraulic fracturing of the shale gas horizontal well can be effectively guided.

The invention belongs to the technical field of environmental geotechnics and environment protection and provides an effective vegetation revetment strengthening method under an intense rainfall condition. According to the method, the deformation effect between root hairs, vertical root systems and horizontal root systems with surrounding soil bodies in shallow slip and deep slope slip crack are distinguished. The method comprises the following steps of: determining soil shear strength increased by a ribbing effect of the root hairs; calculating maximum anchoring force of the vertical root systems; calculating interaction force of roots of the horizontal root systems and soil; and reasonably determining the plant line spacing of vegetation on a slope. Based on a soil fixing mechanical effects of the root systems of the revetment vegetation and various root-soil interaction mechanisms, the method provided by the invention is effective and simplified, brings convenience for engineering application, can be used for reinforcing the vegetation revetment and serves as an effective way for preventing slope instability and slippage under the intense rainfall condition. The method can be used for guiding the design and construction of vegetation revetment reinforcing under the intense rainfall condition and can ensure that the design meets expected prevention and protection requirements, thus avoiding unnecessary economic waste.

The invention relates to an optical receiving assembly for hundred trillion-grade 850nm optical communication and a preparation method thereof, and provides an optical receiving assembly for hundred trillion-grade 850nm optical communication, which is compatible with a commercial CMOS process and can replace the hybrid integration in the traditional 850nm optical transceiver and meet the transmission requirement, and a preparation method thereof. The optical receiving assembly is provided with a 850nm optoelectronic single integrated receiving chip, a pipe seat, a pipe cap, a pipe pin and an adapter, wherein the chip is provided with a prepositive amplifying circuit and an optoelectronic detector, and the prepositive amplifying circuit is provided with two mutual resistance type amplifying circuits, a three-grade differential amplifier, an output buffer circuit and a direct current negative feedback circuit. The optoelectronic detector is provided with a low doped P-shaped silicon substrate, a P pit, an N-shaped heavy doping silicon layer, a field oxide layer, an aluminum layer, three SiO2 insulating medium layers and a Si3N4 surface passivating layer from bottom to top in the longitudinal direction. The chip is attached to the pipe seat by a CMOS process; a welding disk of the chip is bonded with the pipe pin by a gold thread; and the pipe cap is covered to be encapsulated with the adapter according to the same shaft.

The invention discloses a performance and reliability joint simulation design method for an aerospace mechanical and electrical product. Actual operation conditions of products can be comprehensivelycovered, weak links are fully exposed, performance design and reliability design are effectively combined, a quantitative relation between reliability indexes and key performance design parameters isestablished, design and manufacturing of the products are effectively guided, and the reliability design level of the products is fundamentally improved. According to the method, a technical approachand a method support can be provided for integrating product reliability design analysis into conventional design; a major breakthrough of a product performance and reliability combined design technology is achieved, the major basic capacity is improved, the cost is effectively reduced, the development period is shortened, the efficiency is improved, and high-level technical services are providedfor developing aerospace electromechanical products with high reliability, high precision and high performance.

The invention relates to a method for evaluating the impact risk of near-field surrounding rocks in a mining space by using electromagnetic wave CT, which comprises the steps of constructing a transmitting hole and a receiving hole which are at the same height from a bottom plate and mutually parallel according to a elevation angle [alpha] on the same lateral wall of the mining space, and respectively placing a transmitting end and a receiving end of the electromagnetic wave CT in the two holes so as to obtain the field intensity of electromagnetic waves after passing through a detection areaand being attenuated, obtaining a two-dimensional distribution matrix of the electromagnetic wave absorption coefficient through field intensity inversion, building an impact risk evaluation model based on the electromagnetic wave CT, obtaining a two-dimensional distribution cloud map of impact risk indexes of the detection area, and completing the evaluation for the impact risk of the near-fieldsurrounding rocks in the mining space by using the electromagnetic wave CT. The method can perform accurate evaluation on the impact risk of the near-field surrounding rocks in the mining space, and has high guidance significance for prevention and control of rock burst.

The invention discloses a continuous casting forming device and method for ceramic particle reinforced metal matrix composites, and belongs to the technical field of continuous casting. The device mainly comprises a preheating drying device, a delivering tube, a mixing ladle, a sliding nozzle, a stirring tundish, an electromagnetic stirring device, a stopper, a crystallizer, crystallizer electromagnetic stirring device, a secondary cooling device, a dummy ingot device, a withdrawal and straightening machine, a flame cutting machine and the like. The drying device and the delivering tube are arranged at the position of the mixing ladle, feeding, drying integration and automatic production can be realized, the production efficiency is improved, and the labor cost is saved; and the tundish and the crystallizer are provided with a mixing tank and the electromagnetic stirring device, thus, ceramic particles in molten steel are distributed uniformly, an effect of dispersed distribution of hard particle phases in a solidified metal matrix is achieved, the quality of a continuous casting composite blank is improved favorably, and the composites with uniform structures and mechanical properties are obtained. By the continuous casting forming device and method for the ceramic particle reinforced metal matrix composites, the metal matrix composites with uniformly distributed ceramic particles can be effectively produced in a continuous casting manner, the production time is saved, the automation level of production is improved, and it ensures that factors which affect quality of products in various working procedures and various links are in a controlled state.

The invention relates to the field of tunnel engineering, in particular to a tunnel cold-proof and freezing-proof system in alpine regions. The tunnel cold-proof and freezing-proof system comprises afan, a generator, a freezing-proof layer and an electric heating element, wherein the fan is arranged in a tunnel; the generator is connected with the fan; the freezing-proof layer is arranged betweena primary support and a secondary lining of the tunnel or arranged on the side, close to the center of the tunnel, of the secondary lining; and the electric heating element is electrically connectedwith the generator, and the electric heating element is arranged in a drainage system and / or the freezing-proof layer of the tunnel. The tunnel cold-proof and freezing-proof method and the heat energycalculation method are based on the system. According to the tunnel cold-proof and freezing-proof system, clean energy wind energy generated in the tunnel is utilized, extra manual energy applicationis not needed, freezing damage is avoided, and meanwhile the beneficial effects of being capable of saving energy, free of pollution and high in working frequency are achieved.

The invention discloses a designed compaction number-of-times determining method of an emulsified asphalt cold recycled mixture. The method comprises the following steps of a first step, molding the emulsified asphalt cold recycled mixture with different factors by means of SGC; a second step, determining a maximal compaction number-of-times Nmax, back-calculating and drawing a compaction curve of the emulsified asphalt cold recycled mixture, and calculating a corresponding compaction parameter according to each compaction curve; a third step, researching sensitivity of each factor to all compaction by means of a single-factor variance analysis method, and evaluating effectiveness of each compaction parameter; and a fourth step, determining a significant influence factor of a designed compaction number-of-times Ndes, finding out main affecting factors by means of a stepwise regression analysis method, and establishing a regression equation of the designed compaction number-of-times Ndes. According to the designed compaction number-of-times determining method, the stepwise regression analysis method is utilized; compaction temperature and emulsified asphalt amount are determined as main factors; and a standard regression equation of the designed compaction number-of-times Ndes of the emulsified asphalt cold recycled mixture is established.

The invention discloses a graded broken stone dynamic resilience modulus rapid prediction method considering particle crushing. The method specifically comprises the steps: determining multiple groups of physical property parameters of graded broken stones under the conditions of different gradation, different compaction degrees and different water contents; respectively measuring the dynamic resilience moduli of a plurality of groups of graded broken stones according to a dynamic triaxial test, predicting by adopting a three-parameter model, and fitting the three-parameter model to obtain model fitting coefficients k1, k2 and k3 based on the dynamic resilience moduli of each group of graded broken stones obtained by the dynamic triaxial test; and determining the contribution ratio of all the physical property parameters of each group of graded broken stones to the fitting parameters k1, k2 and k3 of the three-parameter model, and determining the correlation between the fitting parameters k1, k2 and k3 of the model and all the physical property parameters by adopting a stepwise multivariate regression analysis method to obtain a rapid prediction formula. According to the method, the dynamic resilience moduli of the graded broken stones can be conveniently and accurately obtained, design and construction of the graded broken stones in a pavement structure are scientifically guided, and the engineering quality is guaranteed.

The invention provides a method for evaluating a withstand current of a high-resistant neutral point small reactor, which is based on an electromagnetic transient simulation method, sufficiently considers different fault types and working conditions, and calculates the current withstood by the high-resistant neutral point small reactor in the actual operating process. The method comprehensively considers an operation mode of a 750k double-circuit transmission line according to different faults and working conditions, and obtains maximum temporary currents probably withstood by the high-resistant neutral point small reactor in the process of various faults and working conditions. The current is the maximum current actually and probably withstood by the high-resistant neutral point small reactor in the process of system operation. Thus, the current can guide the design and the manufacturing of the small rector better.

The invention provides a closed cooling tower checking method based on hot water cooling. According to existing parameters such as environmental meteorological conditions, cooling tasks, existing tower model parameters, the cooling tower spraying water yield and the fan delivery and by means of heat transfer theory basic formulas and oval tube heat and mass transfer empirical formulas, thermal analysis is carried out, the hot water outlet temperature is calculated, the cooling capacity of a closed cooling tower is verified, and design and optimization of the closed cooling tower are guided. The checking method comprises thermodynamic heat transfer analysis and further comprises mass transfer analysis of a wet area portion. Besides, a mature calculation method is provided for the special closed cooling tower composed of an oval tube heat exchanger, mature closed tower checking calculation theories are provided for production of an existing unconventional closed tower, the rationality ofclosed tower design is verified, the heat exchange efficiency is improved, the production cost is reduced, and the operating cost is reduced.

The invention discloses a blocked analysis method for a large-size machine tool structural member. The method comprises the steps of establishing a combining surface rigid model based on a three-dimensional fractal contact theory, and identifying a normal stiffness and lateral stiffness; performing parameter modeling of the large-size structural member (crossbeam) based on a definite element method, and integrating the identified normal stiffness and the lateral stiffness into a large-size structural member three-dimensional model; and utilizing a parameter blocked designing method and a particle swarm optimization method, optimizing the dynamic performance of the large-size structural member (crossbeam), and designing the optimized large-size structural member (crossbeam) three-dimensional model by means of an optimization result. A re-manufacturing factor is taken into a designing period so that the structural member not only can satisfy function and performance requirement of a product and furthermore facilitates manufacturing, transportation, assembling and re-manufacturing. The blocked analysis method for the large-size machine tool structural member is deeply understood, thereby better guiding designing and application of the large-size machine tool structural member.

The invention relates to the field of suspended tunnel physical model tests, in particular to a design method of a three-dimensional elastic model of a suspended tunnel, the three-dimensional elasticmodel and a design method of the suspended tunnel. According to the design method of the three-dimensional elastic model, under the conditions that strict elasticity similarity is difficult to realizeand the suspended tunnel mainly pays attention to deflection change, the flexural rigidity similarity of the model and the prototype is considered, and the problem of elasticity similarity of the model is processed through the flexural rigidity similarity, so that the three-dimensional elastic model capable of reflecting the real response law of the suspended tunnel can be obtained, and the design method is low in design and manufacturing difficulty. By means of the design method, the three-dimensional elastic model of the suspended tunnel can be obtained and can be used for guiding design ofthe suspended tunnel.

The invention discloses a method for reducing soil pressure applied by a two-layered filling roadbed to a retaining wall. The method can be used for reducing the soil pressure applied by the two-layered filling roadbed to the retaining wall in the road construction process. In the invention, calculation of the soil pressure applied by the two-layered filling roadbed to the retaining wall is not based on Coulomb's earth pressure theory, but the flow rule related to force analysis and filling motion on horizontal soil layer unit bodies behind the retaining wall. The method, disclosed by the invention, not only can obtain the strength and distribution of the soil pressure applied by the two-layered filling roadbed to the retaining wall, but also can analyze the influence of different filling sequences on the soil pressure, thus selecting a lower soil pressure scheme. The method is very important in practice for scientifically and reasonably guiding design of the retaining wall in the road construction process.

The invention provides a detection device and method of a spray head mechanism of a 3D printer. The detection device includes but is not limited to the following components, an extrusion system, a pressure testing mechanism and a control system. The extrusion system is used for conveying, melting and extruding printing wires. The pressure testing mechanism is connected with the extrusion system soas to measure the extrusion pressure of the wires. The control system is connected with the extrusion system and the pressure testing mechanism. The device is adopted for detecting the spray head mechanism, the 3D printing wires can be molten and extruded according to different printing speeds, printing temperatures, pumpback distances and other parameters, the extrusion pressure, the outlet temperature, extrusion swelling, nozzle material leaking and other extrusion behaviors are tested and expressed, statistic analysis is carried out on testing data, adaptability of the tested wires and thespray head mechanism can be evaluated, and the optimal service conditions of the wires are found out.