67 results about "Engineering research" patented technology

The invention relates to the technical field of software engineering research and discloses a positioning-data trajectory tracking method. The positioning-data trajectory tracking method includes the following steps of A), acquiring neighboring positioning points of P1 and P2; B), acquiring road data matched with the P1 and a road element point set in the road data; C), sequentially acquiring points located ahead of the P2 and included in the road element point set for moving points along the moving direction of a vehicle when the road matched with the P1 is a curve; D), drawing trajectories according to coordinates of the P1, the moving points and the P2; wherein if the number of the moving points is larger than 1, arraying the drawn trajectories according to the order acquired. By the aid of analysis of the neighboring positioning points, the proper points in the road element point set are selected as the moving points of the vehicle, untruthfulness in drawing of the trajectories due to the fact that the neighboring positioning points are scattered therebetween is improved, and the accurate, true and smooth trajectories can be acquired by drawing the trajectories according to the points.

The invention discloses an ocean engineering foundation adopting a pile-barrel foundation structure, wherein a first pile-sinking and then barrel-sinking method and a first barrel-sinking and then pile-sinking method are adopted. After the pile-barrel foundation structure is sunken into a seabed soil layer, upward-pulling, downwards-pressing and horizontal loads are resisted by using a special node structure so as to maintain the stability of a foundation structure; and the engineering property of the pile-barrel foundation is combined with the mechanical design performance to perform structural reinforcement on the combined part of the pile and the barrel. The ocean engineering foundation disclosed by the invention not only can be used for exerting favorable vertical bearing capacity of a pile foundation, but also retains the favorable capability of the barrel foundation in resisting a horizontal load. The ocean engineering foundation can make the two foundations complement the advantages of each other, and has favorable development prospect and a value for deep engineering research.

The invention relates to a testing device for simulating a submarine landslide and a testing method thereof. The invention aims to provide the testing device for simulating the submarine landslide which is simple in structure and convenient in operation and the testing method thereof. Through the technical scheme, the testing device for simulating the submarine landslide is characterized in that the testing device is provided with a model casing; the model casing is provided with a glass face convenient to observe the internal situation of the model casing; the model casing is internally provided with a slantly arranged slide rail; the lower end of the slide rail is rotatably connected with a supporting plate; the supporting plate is fixed to the model casing; the upper end of the slide rail is connected to the model casing through a slide rail inclination adjusting mechanism; the upper surface of the slide rail is covered with a cushion layer; a mudflow generating mechanism for releasing mud is arranged above the upper part of the slide rail; and a monitoring mechanism for monitoring the state of the mud on the slide rail is arranged corresponding to the slide rail. The testing device is applicable for the field of ocean engineering research.

The invention relates to the field of geological engineering research and discloses a test device for measuring a permeability coefficient of supercritical CO2 in rocks. The test device is characterized by comprising a high-pressure permeation chamber, a contact-temperature water circulation device, a confining pressure supercharger, an inlet buffer container, an outlet pressure buffer container, a backpressure regulating valve, an outlet pressure regulating valve, a flowmeter and a CO2 booster pump. The high-pressure permeation chamber is used for containing a rock sample for performing a permeation test and is respectively connected with the contact-temperature water circulation device, the confining pressure supercharger, the inlet buffer container and the outlet pressure buffer container. A key member of the device is the high-pressure permeation chamber. The high-pressure permeation chamber is made of high-strength stainless steel and has certain thickness, and high pressure in an inner cavity of the high-pressure permeation chamber is borne, and the high-pressure permeation chamber is not damaged. The high-pressure permeation chamber comprises an outer shell, the inner cavity, a safety valve and an exhaust valve. The test device is reasonable in design, convenient to use and high in efficiency, and the cost of the whole device is low.

The invention discloses a different material interface test device under a uniformly distributed load and a photoelastic test method. The test device comprises a test platform, a model box device and a loading system, wherein the model box device is arranged on the test platform; both the model box device and the test platform are horizontally arranged; and the loading system is arranged at the upper part of the test platform and used for loading the uniformly distributed load to the model box device. The photoelastic test method comprises the steps of: building and adjusting the model test platform by adopting the different material interface test device according to test requirements, processing a model material, arranging and adjusting the test model box device after a cross cursor is arranged, selecting and adjusting the load loading system, and carrying out post-treatment on the test data by combining with reference ratio basis points through a non-contact photoelectric data collection system. According to the different material interface test device and the photoelastic test method disclosed by the invention, stress transmission and deformation data inside the model material, especially two different material side interferences, can be obtained in real time; and accurate test data can be provided for theoretical and practical engineering researches. The different material interface test device has the advantages of simple structure, easy operation, strong repeatability, accurate data and good test effect.

The invention relates to an online observation device and method for weather phenomena based on a light attenuation and scattering theory. The online observation device adopts an optical-mechanical structure with double light-source transmitting terminals and a single receiving end, and the optical-mechanical structure is as follows: a light source 1 transmits a precise parallel measuring light band; when falling precipitation particles pass through the measuring light band, the falling precipitation particles play a role of blocking and attenuating the light band; a photoelectric conversion signal is analyzed, so that the falling speed of the precipitation particles and the information of particle sizes can be obtained, the judgment to a precipitation weather phenomenon is realized, and the information such as precipitation intensity and raindrop spectrum can be provided; a light source 2 transmits a collimated measuring light beam; the scattering light intensity in an angle of horizontal 45 degrees of atmospheric particles in a sampling area on the light beam is detected, so that atmospheric visibility is reflected, and the identification of a visible weather phenomenon is realized. The device and the method realize the online automatic observation of a variety of weather phenomena, avoid adverse factors such as subjectivity in manual observation to cause observed results to be more accurate, timely, complete and integrated, have real significances on corresponding sciences such as meteorology, agriculture and environmental protection and engineering researches, and are widely applied to the fields of meteorological service observation, traffic safety scheduling, prevention and reduction of agricultural disasters, air quality monitoring and the like.

The invention belongs to the technical field of geological blasting and discloses a simulation analysis method of a three-dimensional value of power response of foundation ditch blasting to surrounding building structures. The method includes the steps of adopting finite element software ABAQUS for conducting three-dimensional modeling; firstly, conducting model analysis on a structure system, analyzing self-vibration characteristics and giving a structural self-vibration frequency and a first 6-order formation; then, conducting three-dimensional value simulation on power response to the surrounding building structures in a blasting excavation process of subway deep foundation ditches, analyzing a change rule of the vibration speed of the structure system under the action of a blasting impact load, and giving a displacement cloud picture of the structure system and stress distribution of a framework structure. A guidance significance is provided for ultra-deep foundation ditch blastingengineering research under a complicated stratum condition in the future.

The invention relates to a method for detecting activity of a chloroplast promoter on the basis of a tetracycline regulation system, belonging to the technical field of plant plastogene engineering research. The method comprises the following steps: on the basis of the tetracycline gene and tetracycline specific recognition sequence core control region, biosynthesizing a prrnO1O2 promoter with the tetracycline core control region, verifying the activity of the promoter in prokaryotic cells, and carrying out GFP (green fluorescent protein) gene expression under the driving action of the promoter; establishing a tetracycline-induced expression vector, and screening out the tetracycline suitable for bacterium growth, of which the maximum concentration is 5 mu g / ml; and finally, establishing the GFP expression vector under the tetracycline regulation system, wherein the function of the prrnO1O2 promoter is inhibited when the tetracycline is not added, and the GFP gene expresses green fluorescent proteins after the tetracycline is added. The tetracycline regulation system is utilized to control the activity of the chloroplast promoter, thereby avoiding the regulation interference of the nuclear genome on the plastome, and providing an effective method and way for further plastogene engineering breeding.

The invention relates to a visualized quantitative evaluation method of oil and gas field similarity. The method comprises the following steps that (1) the percentage ranking of six static parameters of a targeted oil and gas field in the similar oil and gas fields is respectively calculated; (2) a radar graph of the percentage ranking of the static parameters of the targeted oil and gas field is drew, a characteristic polygon of the targeted oil and gas field is formed, and the characteristic polygon of the similar oil and gas fields is also drew in the same radar graph; (3) the parameters of which the percentage ranking is lower than 5% are judged and studied, which are also called master control factors of the targeted oil and gas field in the radar graph; (4) the similarity of the targeted oil and gas field and every similar oil and gas field is calculated; (5) when the master control factors exist in the targeted oil and gas field, the oil and gas fields with the same master control factors, with the similarity ranking among the top five and with the similarity higher than 50% are judged as the most similar oil and gas fields, and when the master control factors do not exist in the targeted oil and gas field, the oil and gas fields are judged merely according to the similarity; and (6) the basic data of the similar oil and gas fields determined by the step (5) is output in a form, the radar graph is drew according to the absolute figure of the parameters and analyzed and used by reservoir engineering researchers.

The invention provides a method for evaluating vehicle NVH performance attenuation of an internal combustion engine. According to the method, the vehicle NVH performance attenuation condition under various working conditions of vehicle idling, acceleration, high-speed constant speed, sliding and the like can be evaluated, and corresponding engineers are guided according to the attenuation degreesof different working conditions to analyze and research automobile vibration and noise change law and characteristics, so that the engineers are guided to discover key factors influencing automobile vibration and noise as well as the variation difference after combined action of various influence factors on vibration and noise quality of parts and the system, and the engineering research and development efficiency is improved.

The invention provides a compound system voltage stability discrimination method under an extra-high voltage direct-current layered access way. The method comprises the following steps: on the basis of an equivalent model of an alternating current and direct current system under the extra-high voltage direct-current layered access way, deducing to obtain a calculation method of the VSF (Voltage Stability Factor) of each layer of converter bus of a compound system and the CVSF (Comprehensive Voltage Stability Factor) of the system; according to a give system parameter, calculating the value of the VSF of each layer of converter bus and the value of the CVSF; and according to the VSF, judging whether system voltage loses stability. Compared with the prior art, the compound system voltage stability discrimination method carries out quantization on the voltage stability characteristics of the alternating current bus of the compound system under a new access way that extra-high voltage is subjected to direct-current layered access into a receiving end power grid to be favorable for analysis. According to the VSF, the weakness of the voltage stability of the alternating bus of the compound system is judged, and the compound system voltage stability discrimination method can be used for guiding practical extra-high voltage direct-current layered access engineering researches.

The invention provides a drug / factor control-released thin film scaffold. The drug / factor control-released thin film scaffold is characterized by comprising a film-like bionic scaffold, a PDGF (Platelet Derived Growth Factor) coating layer and a slow release layer which are sequentially arranged. According to a scaffold material, i.e, a film-like scaffold material on the surface layer of a factor / the core layer of a drug, for clinic periodontal treatment, provided by the invention, controlled release of active factors and drugs is realized, and cell proliferation and osteogenic differentiation are promoted, so that three elements of seed cells, a scaffold material and regulatory factors in tissue regeneration are organically combined, periodontal repairing is promoted, and a facilitation function for periodontal tissue engineering research is obtained.

An optimal adjustment method a high-dip oil reservoir is disclosed. Sufficient development dynamic data, thorough study of geological structure and clear division of substrata are fully utilized to carry out geological comprehensive study and reservoir engineering study. Combined with pilot test results, the complete numerical simulation results of the whole reservoir are obtained, so that the distribution of undeveloped remaining oil can be obtained directly according to the numerical simulation results, and a sufficient theoretical basis is provided for the secondary development. The methodbrings convenience to directly arrange the adjustment well pattern in the remaining oil distribution dense area, avoids the problem that the adjustment wells are repeatedly arranged or arranged too little, solves the problem that the prior art lacks the overall, reasonable and fully implementable development strategy for the old oilfield with high dip angle, and realizes the purpose of providing the overall layout idea for the secondary start of the old oilfield with high dip angle.

The invention belongs to the field of enzyme engineering research and development technology. The invention relates to an agarase immobilization method research. The invention comprises the following steps: preparing a 1:20 (W / V) of chitosan solution with 1.5-2% (V / V) of acetate for fully dissolving; dropping the dissolved chitosan solution drop by drop into a 1 mol / L sodium hydroxide solution, and filtering and collecting a chitosan bead; washing to neutral with distilled water, and then immersing with a 0.2 mol / L phosphate buffer solution of pH7.6 overnight; fetching the immersed chitosan bead carrier 2.5-5 g, and adding 2.5% of glutaraldehyde 20-25 ml, carrying out water-bath oscillation for 0.5 hours and room temperature crosslinking for 5-6 hours, and washing the chitosan bead cross-linked carrier with a phosphoric acid buffer; adding diluted agarase liquid 10-15 ml into the chitosan bead cross-linked carrier, stirring uniformly, fixing at 4 DEG C for 2-3 hours, washing with the phosphoric acid buffer; obtaining the immobilized agarase by vacuum-pumping. The agarase immobilization method provided by the invention has the advantages of cheap and easily available carrier, simple technology, mild condition and small loss of enzyme activity, and the enzyme activity recovery rate reaches to 77.6%.

The invention provides a data receiving and transmitting system and method for remote support of satellite tests. A data forwarding module is deployed in a satellite front end test system to send all kinds of data collected by a test system to a remote support center by an optical fiber network after encoding and compressing the same; and a data receiving module is deployed in the remote support center to receive the data of the data forwarding module, reduces the data into front end satellite and ground equipment data formats by decompression and decoding and releases the data to a telemetering display terminal, a load display terminal, a bus monitoring terminal and other software to carry out data analysis and judgment. By adoption of the data receiving and transmitting system and method provided by the invention, the technical guarantee work of satellites when executing transmitting tasks is simplified, the workload of engineering research personnel is greatly reduced, and the test efficiency is improved.

The invention discloses a construction method of a sand replacement mixing pile impervious wall. The method comprises the following main steps of: 1. engineering research; 2. engineering analogy analysis; 3. construction scheme study, check calculation and determination; 4. construction preparation; 5. sand pile or sand wall construction; 6. mixing pile construction; 7. rebar insertion; 8. pile head excavation and breaking; 9. core detection; and 10. impounding test. Compared with the prior art, the method has the following beneficial effects that: the sand piles are adopted to replace the silt soil in the range of the impervious wall and then the wall is formed by the mixing piles, thus improving the strength of the pile bodies, increasing the adhesive forces of the inserted rebars in the mixing pile bodies, effectively connecting the impervious wall with the sluice floor slab and avoiding leakage passages formed because the foundation soil sinks and pulls down the impervious wall to break away from the floor; the problem of imperviousness treatment of the sluices and the locks after the pile foundation is adopted is better solved; and the technical construction cost is lower.

The invention discloses a three-dimensional active complex of dental pulp stem cells for nervous tissue engineering and a three-dimensional construction method thereof. The three-dimensional active complex and the three-dimensional construction method disclosed by the invention have the main beneficial effects that a GelMA-bFGF hydrogel complex is constructed by GelMA hydrogel carrying bFGF, and as an active carrier for three-dimensional culture of the dental pulp stem cells, the three-dimensional active complex can provide a supporting effect, an exchange effect and active microenvironment and other effects for culturing the dental pulp stem cells; a large amount of active dental pulp stem cells can be effectively obtained, the benefit for proliferation and fast growth of the dental pulp stem cells is achieved, and the active three-dimensional-culture dental pulp stem cells can be effectively obtained for application in the nervous-tissue engineering research.

The invention provides a measuring device for crushing of soil particles around a pile and a measuring method of the measuring device. The measuring device comprises a test box, a model pile, a jack,and a high-definition camera. The measuring method includes the steps of dyeing soil particle layer arrangement, sampling design and method, and particle image processing; in the test box, the soil particles with different particle colors according to the particle sizes are distributed at the bottom of the pile and the side of the pilein layers; the pile is sunk and the particles are crushed through the jack; reasonable space sampling point locations are designed, and bulk solids or original samples are obtained; and samples are photographed by the high-definition camera, and particle crushinginformation is analyzed through image processing software. According to the measuring device for crushing of the soil particles around the pile, the difficult problem that crushing of the soil particles with the large sizes around the pile is difficult to measure is solved, various working conditions can be simulated, test operation is convenient, crushing of the soil particles with the differentparticle sizes is distinguished, by combining modern image processing technology information, abundant parameters are provided for studying the interaction between the pile and soil, and reference can be provided for crushing of the soil particles around the pile in practical engineering research.

The invention discloses a tester for an interface of different materials under a point / rectangular load and a photoelastic test method. The tester comprises a test platform, a model box device, and a loading system, wherein the model box device is arranged on the test platform; the model box device and the test platform are horizontally arranged; and the loading system is arranged on the upper part of the test platform to load / unload the point / rectangular load on / from the model box device. The photoelastic test method comprises the following steps of: building and regulating a model test platform according to test requirements, processing a model material, arranging a cross cursor, and mounting and regulating the model box device; selecting and regulating the loading system; and post-processing test data by using a noncontact photoelectric data acquisition system and combining reference proportion base points. The invention can acquire stress transmission and deformation data in a model material, particularly the stress transmission and deformation data of the interface of two different materials in real time, and provides accurate test data for corresponding theoretical and actual engineering research.

The invention discloses an optimization method of airplane wiring harness mass distribution data and relates to the weight research direction in the technical field of airplane overall design. The optimization method is used for improving the airplane wiring harness mass distribution analysis precision. The optimization method includes the steps that S1, a wiring harness three-dimensional coordination model is designed, and the mass distribution data of the state of the wiring harness three-dimensional coordination model are calculated; S2, the wiring harness actual weigh of the wiring harness three-dimensional coordination model is calculated; S3, the wiring harness actual weight is compared with the weight of the three-dimensional coordination model, and the difference between the wiring harness actual weight and the weight of the wiring harness three-dimensional coordination model is obtained; S4, the mass distribution data of the state of the three-dimensional coordination model are subjected to optimal calculation according to the difference between the wiring harness actual weight and the weight of the wiring harness three-dimensional coordination model and a preset formula. According to the optimization method of the airplane wiring harness mass distribution data, the difference between the airplane wiring harness engineering research state and the three-dimensional model state is compared, a reasonable and effective data optimization method is adopted, airplane wiring harness distribution analysis precision is improved, and analysis data can really reflect the engineering trail state of an airplane.

A calculation method for underground water critical depth on a condition of phreatic evaporation belongs to a calculation method for underground water critical depth. The calculation method is on the basis of Mualem-Van Genuchten soil moisture characteristic curve equation and a one-dimensional homogeneous soil steady state evaporation model of Gardner. The calculation method comprises the following steps of: 1, determining the area of a study region and a calculation time interval; 2, determining parameters of the Mualem-Van Genuchten soil moisture characteristic curve equation of the study region; 3, determining calculation surface soil evaporation intensity of the study region and a soil negative pressure absolute value of an earth surface; and 4, calculating the underground water critical depth of the study region on the condition of phreatic evaporation. The calculation method for the underground water critical depth has the advantages that the underground water critical depth can be rapidly and effectively calculated, the calculation result is contributed to a favorable reference value and beneficial for engineering research staff to use, the technical problems of the blank in the calculation method for the underground water critical depth and value uncertainty are solved, and the calculation method can be applicable for different places and different soil types.

The invention discloses a dry type reactor epoxy resin insulating medium crack testing method which is an online testing method. The method comprises two main steps, namely establishing an image threshold information database and performing dry type reactor epoxy resin insulating medium crack testing, wherein a, the step of establishing the image threshold information database comprises convertingacquired discharging threshold source data information and temperature threshold source data information to discharging image threshold data information and temperature image threshold data information; and b, the step of performing dry type reactor epoxy resin insulating medium crack testing comprises the following procedures of image information sampling; determining a contour superposing partin the image as a dry type reactor epoxy resin insulating medium crack position, and determining no crack of the dry type reactor epoxy resin insulating medium when no contour superposing part is detected between the discharging image information and high-temperature image information. The dry type reactor epoxy resin insulating medium crack testing method has advantages of high testing efficiency, high reliability, high suitability for engineering researching and scientific researching, and relatively high application value.

The invention discloses a mechanical model for determining the torque of internal thread cold extrusion molding, characterized by acquiring the function relation of time, extruding workpiece material, extruding tap structural parameters and extruding technological parameters by hypothesis and simplification based on an internal thread cold extrusion molding mechanism and a theory of plastic mechanics. Test data show that the theoretical torque value calculated by the mechanical model is consistent with the test value, and has some engineering research values.

The invention discloses an ocean engineering foundation adopting a pile-barrel foundation structure, wherein a first pile-sinking and then barrel-sinking method and a first barrel-sinking and then pile-sinking method are adopted. After the pile-barrel foundation structure is sunken into a seabed soil layer, upward-pulling, downwards-pressing and horizontal loads are resisted by using a special node structure so as to maintain the stability of a foundation structure; and the engineering property of the pile-barrel foundation is combined with the mechanical design performance to perform structural reinforcement on the combined part of the pile and the barrel. The ocean engineering foundation disclosed by the invention not only can be used for exerting favorable vertical bearing capacity of a pile foundation, but also retains the favorable capability of the barrel foundation in resisting a horizontal load. The ocean engineering foundation can make the two foundations complement the advantages of each other, and has favorable development prospect and a value for deep engineering research.

The present invention relates to a rapid detection method for the magnetic interference of core on a low-field nuclear magnetic resonance image, and belongs to the technical field of low-magnetic field nuclear magnetic resonance detection and petroleum engineering recovery rate improving. With the development of the low-field nuclear magnetic resonance core flooding system online detection technology and the nuclear magnetic resonance image post-processing software, the nuclear magnetic resonance technology are increasingly being used for detecting the flowing condition of the fluid inside the core porous media, the detection of the nuclear magnetic resonance technology on the fluid flowing process inside the core is convenient and intuitive and meets the actual flow field condition of the fluid, and the development of the technology provides important theoretical and practical significance for the petroleum engineering research on the recovery rate improving mechanism. According to the present invention, the core and the standard water sample are subjected to bundled test, and the intensity of the magnetic interference of the core is determined through the deformation condition of the standard water sample image; and the testing method is fast and intuitive, has strong reliability, and is the effective method for detecting the core magnetic interference.

The invention discloses a top-distribution energy-saving high-concentration anaerobic fermentor and belongs to the technical field of biogas engineering practice. The top-distribution energy-saving high-concentration anaerobic fermentor is characterized in that top distribution is completed through the steps of mixing solid materials with a reflux biogas slurry via a solid-liquid mixing three-way joint mounted on a reflux pipeline by use of a solid material preheater communicated with a screw extruder or a plunger pump, and a communicating pipe, and then conveying the mixture to a rotating distribution nozzle, besides, a trapezoidal conical funnel for gathering and intercepting high-concentration materials and separating out the biogas slurry is arranged under the heater and inserted into an umbrella-shaped cone to gather the materials to ensure ordered discharge without disordered layer thickness in ordered fermentation, and the biogas slurry with the heat value is recycled by use of biogas slurry reflux and direct solid-liquid separation, and consequently, high-efficiency energy saving is realized. The top-distribution energy-saving high-concentration anaerobic fermentor is innovative and practical in that a top-distribution vertical-barrel type anaerobic fermentor is fabricated into a high-efficiency energy-saving product in the field of biogas engineering research.

The invention provides an instrument for intelligently detecting a Nano SIM card dynamic signal, and the instrument comprises a circuit board main body and an external Nano card seat, an external Micro SIM card seat, a plurality of LED signal indicating lights and a plurality of test pin contacts which are arranged on the circuit board main body; one end of the circuit board main body extends outwards and comprises a connecting plug which is used for inserting to a socket of to-be-detected equipment; and a pad which simulates a Nano SIM card is welded with the back of the plug; and the pack on the back of the plug, the external Nano card seat, the external Micro SIM card seat, the plurality of LED signal indicating lights and the plurality of test pin contacts have VCC, CLK, RST, IO and VPP contacts. According to the invention, the design adopts a low voltage red LED light to perform signal indication, the instrument can dynamically and precisely display if a state of each signal exists in real time, the instrument is convenient to help engineering technicians and general maintenance personnel quickly locate which signal is not conducted, the reliability is high, and engineering research personnel can more conveniently and quickly analyze and locate a problem.

The invention relates to a method for preparing hydrogen through water photolysis, which in detail relates to a method for generating hydrogen through seawater photolysis with marine green alga. It takes marine green alga asww systematic hydrogen generation material, installs alkaline hydrogen-oxygen fuel cell continuous hydrogen consuming system on photoreactor to maintain low hydrogen pressure in system, the hydrogen concentration in system can be reflected by measuring the circuit current outside battery according to the relevant relationship between electron number and hydrogen number, and studies the characteristics of green alga under CCCP stress and regulation. The hydrogen generation time is prolonged by 5 times under continuous hydrogen consumption by fule battery to 120 hours; and the total hydrogen output is 54.4 ml, which is 2.2 times of the optimal level of unused fule battery continuous hydrogen consumption system. The invention is characterized by high-effective and sensitive inspection for hydrogen generation, simple method, strong anti-interference and wide application prospect.

The invention discloses a performance degradation model precision verification method based on leave-one-out cross verification. The method comprises the following steps: 1) collecting data; 2) determining an alternative model form; 3) fitting to obtain an alternative model equation; 4) calculating a fitting error of the alternative model; 5) calculating the predicated error of the alternative model; 6) evaluating the model by means of the predicated error; and 7) determining an optimal model. According to the method, the advantages and disadvantages of the performance degradation model are comprehensively and completely evaluated from the two perspectives of the fitting error and the prediction error, and a new thought is provided for the aspects of model verification and selection in engineering research.