33 results about "Quantitative design" patented technology

The invention provides a layout design method for high-precision magnetron sputtering deposition equipment. The method comprises the following steps: firstly, determining sputtering deposition subsystem layout parameters such as revolution radius, target-base distance, target length and the like according to an optimized target difference value of a to-be-plated element parameter, a target preliminary sputtering yield parameter and a film thickness; then, whether the film thickness distribution under the layout parameters meets an optimization target difference value or not is evaluated; and finally, vacuum chamber subsystem layout parameters such as the diameter and the height of the vacuum chamber are calculated. According to the method, a quantitative design mode is adopted, the problems that existing magnetron sputtering deposition equipment layout design depends on experience, and whether the magnetron sputtering deposition equipment meets design index requirements or not is difficult to evaluate are effectively solved, and the scientificity and rationality of equipment layout are improved.

The application discloses a supporting excavation method for partitioning and leaving piers of soft foundation, and belongs to the technical field of foundation pit supporting of geotechnical engineering. The method comprises the following steps: S1, integrated quantitative design and digital modeling, defining a composite soil pier unit composed of an artificially reinforced core and an undisturbed soil body, calculating a bearing contribution rate and performing non-uniform layout and stability checking; S2, prefabrication and accurate implantation of the structural soil pier unit; S3, partitioned asynchronous excavation based on the structural soil pier, batch excavation of "warehouse rooms" and immediate support of exposed side walls; S4, formation of a permanent composite foundation, rigid connection of the bottom plate and the soil pier through a three-level structural connection system, and construction of a waterproof drainage system, a stiffness transition zone and a health monitoring sensor network. The application integrates the functions of temporary support and permanent foundation, significantly reduces the engineering cost, improves the foundation bearing capacity and anti-settlement capacity, and realizes intelligent monitoring and active regulation in the whole life cycle.

The invention discloses a thermal deformation pre-compensation method for a coreless superconducting cyclotron, and the method comprises the following steps: building a coreless high-temperature superconducting coil three-dimensional model which comprises a plurality of coils with different shapes and positions in the coreless high-temperature superconducting coil; carrying out a complete cooling process from 300K to 20K, and calculating form and position thermal deformation deviations of coils with different shapes and different positions in the model; pre-compensation calculation of the model is conducted through the form and position thermal deformation deviation; according to the pre-compensation amount at the low temperature of 20 K, the pre-compensation amount at the temperature of 300 K is reversely deduced, and the pre-compensation amount comprises a radial amplification coefficient and an axial amplification parameter; and iteration is repeated until the error between the 300K model with the pre-compensation amount and the design target is smaller than the error range. According to the method, the problems that in the prior art, the capability of accurately predicting the deformation behavior of the coil in the extreme temperature change process before the manufacturing stage is lacked, the positive design of pre-compensation cannot be actively carried out, and the basis of quantitative design is lacked are solved.

The application discloses a kind of semi-covering layer semi-bedrock foundation gravity dam foundation seepage prevention water stop design method, belong to the field of hydraulic engineering design.This application method is aimed at the complex conditions of semi-covering layer semi-bedrock foundation, adopts zoning combination seepage prevention scheme: bedrock region sets seepage prevention curtain, covering layer region sets seepage prevention wall;Comprehensive construction period structure dead weight, running period structure dead weight, water pressure, uplift pressure and other loads, design seepage prevention wall top and dam foundation embedded joint and dam bottom local structure, reserve deformation and with two purple copper water stop to realize water stop by asphalt mortar joint filling;Finally, the rationality of scheme is verified by three-dimensional finite element seepage deformation numerical calculation.This application breaks through the limitation of traditional design, provides quantitative design method, and has strong operability, provides technical support and reference for similar projects.

The invention discloses a method for evaluating the sealing performance of a fuel cell rubber sealing ring at a low temperature, and relates to the technical field of fuel cell sealing. Measuring a compression force-strain curve at 23 + / -2 DEG C; gradually reducing the temperature to a target temperature point and reading the compression force; establishing a hyper-elastic model based on the stress-strain curve; inputting material properties to perform low-temperature sealing force simulation and calibrating a thermal expansion coefficient; calculating the leakage rate through a temperature-compression ratio-leakage rate quantitative correlation model; and determining a minimum compression ratio design boundary according to the leakage rate threshold value. According to the application, sealing performance evaluation is upgraded from experience qualitative judgment to data-driven quantitative design, the sealing reliability and research and development efficiency of the fuel cell stack in extreme low-temperature environments such as-40 DEG C are remarkably improved, and a scientific basis is provided for commercial application of fuel cells in alpine regions.

The main structure optimization of the force measurement system is divided into three parts: structure parameter optimization of force measurement branches, structure parameter optimization of non-branch structures, and structure parameter fine-tuning of the entire force measurement system. Quantitative design is performed on each part to improve the design efficiency and accuracy of the force measurement system. During the quantitative design process of each part, an elastic resistance error is treated as a forward design indicator and is one of the main components in a coupling error. The structure parameters involved in the elastic resistance error are relatively comprehensive, and the elastic resistance error is considerably correlated with the structure parameters of the force measurement system in consideration of the influence of axial stiffness and lateral deviation stiffness of force measurement on the structural performance. The accuracy of structural analysis and design are thus ensured.

This invention relates to a SCC mix design method and system based on the shear strength theory of cement paste. Its core lies in establishing a cement paste shear strength prediction model. This model quantitatively evaluates the shear strength of the cement paste under a proposed mix proportion and compares it with a pre-determined reasonable range. Then, through iterative adjustments to the cementitious material composition and water-cement ratio, the shear strength of the cement paste falls within the target range, thereby simultaneously optimizing the paste rheology and determining the final mix proportion. This invention achieves complete quantitative design from aggregate to paste, economically and efficiently preventing SCC segregation and maximizing the use of auxiliary cementitious materials to reduce the cost of self-compacting concrete.

The invention is suitable for the technical field of geotechnical engineering blasting, and provides a rock mass blasting parameter determination method based on sound wave velocity, hole depth and explosive load and a measuring plate, the method comprises the following steps: firstly, through multiple rounds of blasting tests, obtaining a data sample set of a sound wave longitudinal wave velocity Vp before blasting, a hole depth h of a blasting hole, an explosive load Q, a wave velocity loss rate eta and a relaxation depth d; then, on the basis of the data sample set, Vp and h serve as variables, and a visual measuring plate of the explosive load Q is constructed through triangular meshing and isoline tracking; before actual blasting, according to the actually measured Vp before blasting and the designed hole depth h, the optimal explosive loading amount can be rapidly determined by searching the measuring plate. The method solves the problem that in the prior art, the explosive load cannot be directly and accurately determined before blasting, quantitative design and accurate control of blasting parameters are achieved, and the method has the advantages of being efficient, visual, objective and capable of being dynamically optimized.

The invention relates to a method for quantitatively designing the functional mix proportion of a phase-change material for SAC. The method comprises the following steps: acquiring a characteristic initial temperature T, a peak temperature T and a characteristic final temperature T of sulphoaluminate cement through an adiabatic temperature rise test; [T, T] is used as a functional targeted phase change interval of the phase change material, and based on the total hydration heat release amount Qcem in the temperature interval and the phase change enthalpy delta Hpcm of the phase change material, the functional mixing amount Mpcm of the phase change material in unit volume of concrete is calculated, then the aggregate dosage is calculated through an absolute volume method, and finally the concrete mix proportion is determined. According to the invention, accurate matching of the phase-change material and sulphoaluminate cement hydration characteristics is realized, and an effective temperature control solution is provided for sulphoaluminate cement concrete construction.

The application discloses a kind of limestone powder replaces silica fume's ultra-high performance concrete interface enhancement evaluation method, belongs to cement-based composite material proportioning design and performance evaluation technical field.The application first establishes the benchmark cementitious material matrix system containing silica fume, and sets up limestone powder gradient replacement group to silica fume;Through 28d matrix compressive strength to different replacement ratio test piece group is pre-screened with strength, selects representative replacement group;The 100h cumulative heat release of representative replacement group, 28d total porosity, single steel fiber peak pullout load and single fiber pullout work are determined, constructs hydration response coefficient, pore structure density coefficient, peak bearing coefficient and energy dissipation coefficient, establishes the coupling determination method of interface enhancement index IEI and strength constraint coefficient Kc;According to IEI and Kc output candidate enhancement group, optimal replacement group and corresponding replacement ratio.The application can be used for the rapid screening and quantitative design of low-silica fume ultra-high performance concrete cementitious system.

The application discloses a kind of based on silicon rubber tangential hydrophobic migration characteristics embedded RTV coating topological structure design method, comprising the following steps: determine the quantitative relationship between static contact angle of pollution layer and low molecular weight siloxane concentration;Experimental acquisition hydrophilic / hydrophobic interface patterning surface tangential hydrophobic migration characteristics, with hydrophobic migration distance quantification;Establish the siloxane tangential diffusion mass transfer model and deduce mass transfer function;Fitting RTV manufacturer, interface width and other variable combinations mass transfer parameter;Hydrophobic migration finite element model is constructed;According to connectivity, non-connected, connected, mixed topology is divided and constraint is generated candidate;Simulation screening optimal topology that global hydrophobic time meets the standard;Output parameter is supplied manufacturing verification.This method realizes embedded RTV coating topological structure quantitative design and optimization, fills the existing design blank, can effectively solve coating peeling problem, improves the reliability and economy of long-term operation of insulator.

Traditional single-exciter vibration testing methods are limited by the heavy mass and low frequency of large transfer platforms, and the non-uniformity of boundary conditions in cavity structures, which easily leads to imbalances in local vibration energy distribution and makes it difficult to accurately simulate vibration responses under actual working conditions. This invention addresses this problem by proposing a multi-exciter vibration testing design method for large-size cavity structures. This method uses multiple exciters to simultaneously apply vibration excitation to the test piece along a single axis. For large-size products, the multi-exciter method can provide sufficient test thrust using multiple exciters. Furthermore, the invention addresses the lack of quantitative design criteria for the exciter position and number based on the geometric characteristics and modal properties of the cavity structure, and the difficulty of existing control algorithms in achieving precise decoupling and coordinated control of excitation forces under complex boundary conditions. These issues are resolved through the design and optimization of large-size test fixture structures and response constraint strategies.

The application is a microbial self-repairing concrete mix proportion design method and design system, the core of which is to establish a quantitative design model with the goal of maximizing microbial repair potential, and to realize the collaborative optimization with conventional concrete mix proportion parameters. First, the required calcium carbonate generation amount is determined based on the target crack size; then, the optimal microbial and nutrient content is calculated through the established microbial metabolism kinetics model; the key is to establish the correlation model of the microbial system as a key factor affecting the water-cement ratio and fluidity and the dosage of the additive, and to perform integrated calculation of the water-cement ratio-aggregate system-additive. The application realizes the leap of self-repairing concrete mix proportion from empirical exploration to quantitative, precise and integrated design.

The invention belongs to the technical field of tunnel construction, and discloses a cavern excavation method based on main stress axis deflection control, which comprises the following steps: dividing a tunnel face of a to-be-excavated cavern into a middle cavern and at least two side caverns; a middle cavity is excavated and supported; the maximum shear stress of the surrounding rock is determined according to the main stress characteristic value of deflection after the middle cavern is excavated and the initial drilling parameters, set before the side cavern is excavated, of the stress release hole group; the shear strength of the surrounding rock is obtained, the shear resistance ratio of the shear strength to the maximum shear stress is determined, and the initial drilling parameters are iteratively adjusted according to the shear resistance ratio; determining the drilling parameters corresponding to the shear resistance ratios meeting the preset requirements as expected drilling parameters; and according to the expected drilling parameters, a stress release hole group is drilled towards the side caverns along the side walls of the middle caverns, and supporting is conducted after the side caverns are excavated. According to the method, through quantitative design of the stress release hole groups, redundant design is eliminated, the number of invalid drill holes is reduced, the engineering cost is reduced, and the construction period is shortened.

This invention relates to the field of precision optical inspection, and particularly to a method for selecting and evaluating the performance of an LC-SLM based on a multi-parameter coupled constraint model. The method includes determining the input variables of the inspection system based on the LC-SLM, which are divided into two main categories: parameters of the surface to be measured and basic requirements of the inspection system; determining the order of the blazed grating based on its diffraction efficiency requirements; determining the bit depth of the LC-SLM based on the accuracy requirements of the inspection system; determining the pixel parameters based on the wavefront modulation requirements of the LC-SLM; establishing a comprehensive error evaluation model for the inspection system; and calculating the total residual error, which is the square root of the sum of quantization error, pixel discretization error, LC-SLM surface shape error, nonlinearity error, and thermally induced phase drift error. This invention enables a systematic and quantitative design and evaluation of the hardware parameter selection, software configuration, and final compensation performance of the LC-SLM.

This invention provides a collaborative calculation method for dry desulfurized phosphogypsum in aerated concrete, relating to the field of building material mix design technology. It aims to overcome the blindness and uncertainty of existing technologies that rely on experience to determine the dosage of dry desulfurized phosphogypsum. This method, by quantitatively controlling the molar ratio of sulfur and aluminum, can avoid the risk of delayed ettringite formation from the source and provides a universal dosage design guideline for different aerated concrete systems (sand-aerated, ash-aerated, and slag-aerated). This method is a quantitative design method for accurately determining the safe and reasonable dosage of industrial solid waste "dry desulfurized phosphogypsum" in the industrial production of autoclaved aerated concrete (AAC), and is particularly suitable for AAC systems using sand or fly ash as siliceous materials.

This invention discloses a composite impact-driven drilling tool, belonging to the field of oil and gas drilling technology. Addressing the problems of poor tool adaptability and asynchronous impact and reversing in existing technologies, this invention proposes a quantitative design method based on the fluid-structure interaction coefficient. The tool's actuating valve assembly includes a coaxially nested inner sleeve and a reversing valve, controlling fluid flow direction through a distribution structure. This invention defines the coupling coefficient between the geometric parameters of the reversing valve and the hydrodynamic parameters. This coefficient is jointly determined by the circumferential impact torque, reversing rotation angle, drilling fluid discharge rate, nozzle pressure drop, and the equivalent hydraulic diameter of the reversing valve, and is controlled within a specific preset range. Through the above quantitative design, the inverse relationship between the reversing angle and the discharge rate is forcibly constrained, achieving efficient synchronization of impact and reversing across the entire discharge range, effectively solving the problems of "idling" or "jamming," and significantly improving rock-breaking efficiency.

This invention belongs to the field of metallic materials technology, specifically a method for designing the chemical composition of low-temperature resistant high-manganese steel forgings. The invention comprises the following alloying elements by mass percentage: C: 0.40%~0.50%, Si: 0.11%~0.22%, Mn: 22.50%~25.50%, Cr: 3.00%~4.00%, Mo: 0.30%~1.00%, V: 0.03%~0.20%, Ti: 0.03%~0.10%, Al: 0.01%~0.10%, P≤0.020%, and S≤0.005%, with the remainder being Fe and unavoidable impurities. In its implementation, this invention comprehensively considers the influence of factors such as the nickel equivalent, chromium equivalent, and stacking fault energy of high-manganese steel, providing a systematic quantitative design method for manganese steel. This method can not only guide the design and development of low-temperature resistant high-manganese steel but can also be extended to the research and development of other new steels by specifying different quantitative value ranges.

The invention discloses a plateau cretaceous system sandstone weathering degree evaluation method and system. A typical cretaceous system sandstone distribution area is selected as a target research area; establishing a cretaceous system sandstone weathering degree evaluation index system by combining weathering influence factors and a weathering mechanism in the region; the method comprises the following steps: sampling and collecting rocks required to be evaluated at different depths in drill holes of a cretaceous system sandstone stratum in a target research area, and detecting and acquiring various weathering degree evaluation index values of the rocks required to be evaluated at different depths; performing function fitting analysis on each weathering degree evaluation index value of the rock to be evaluated under different depths and the depth data to obtain a function relationship of each weathering degree evaluation index value along with the depth change, and determining index division threshold values of stratums with different grades of weathering degrees; therefore, a plateau cretaceous system sandstone weathering degree evaluation system is established. According to the method, a quantitative evaluation system is combined, quantitative design of measures in the construction process in the region can be improved, and the engineering construction cost is saved.

The application belongs to the technical field of oil and gas field development, and particularly discloses a quantitative design method for conversion timing of multi-section slug combination profile control and flooding slug, which comprises the following steps: firstly, core pretreatment; secondly, constant speed oil displacement experiment; and finally, data processing; wherein, the data processing process comprises the following steps: firstly, obtaining the water drive end stage shunt rate, water cut and recovery rate of each layer core, and the chemical flooding stage shunt rate, water cut and recovery rate of each layer core; secondly, calculating the profile improvement rate, oil production increase rate and recovery rate balance degree; then, calculating the displacement balance degree, obtaining the displacement balance degree change curve of each group of experiment, and reading the maximum value; again, calculating the variation coefficient of each group of experiment parallel core utilization limit, and drawing the scatter diagram of the maximum value of each group of experiment displacement balance degree; finally, determining the inflection point value as the timing of injecting the next profile control and flooding system slug. The application can quantitatively guide the conversion timing of each profile control and flooding system slug in real time, maximize the effect of each system slug, and further improve the recovery rate.

This invention relates to the field of roadway support parameter design, specifically to a method for optimizing dynamic support parameters during roadway excavation based on depth sequence modeling. The method includes: organizing support data from completed roadways; constructing training samples (a training sample can be built based on support data from segment 1 to segment m); constructing a dynamic support parameter optimization model for roadway excavation based on depth sequences; constructing a model training loss function and training the model; and excavating a new roadway and providing dynamic support parameters based on the trained optimization model. This invention uses roadway segments as the basic unit, organizing multi-source data from excavated and supported segments, as well as segments to be excavated, into feature sequence inputs. It uses a Transformer architecture to model cross-roadway segment relationships, solving the problem of neglecting lag and cumulative effects in traditional point prediction; and realizing a shift from empirical qualitative design to quantitative design of support parameters.

This invention discloses a method for evaluating the interfacial reinforcement of ultra-high performance concrete using limestone powder as a substitute for silica fume, belonging to the technical field of cementitious composite material mix design and performance evaluation. The invention first establishes a reference cementitious material matrix system containing silica fume and sets up gradient substitution groups for silica fume using limestone powder. The strength of specimens with different substitution ratios is pre-screened based on the 28-day matrix compressive strength, selecting representative substitution groups. The 100-hour cumulative heat release, 28-day total porosity, peak pull-out load of a single steel fiber, and pull-out work of a single fiber are measured for the representative substitution groups. Hydration response coefficient, pore structure compactness coefficient, peak bearing capacity coefficient, and energy dissipation coefficient are constructed, and a coupled determination method of interfacial reinforcement index (IEI) and strength constraint coefficient (Kc) is established. Based on IEI and Kc, candidate reinforcement groups, optimal substitution groups, and corresponding substitution ratios are output. This invention can be used for the rapid screening and quantitative design of low-silica fume ultra-high performance concrete cementitious systems.

The invention relates to a superhard material composite processing method based on laser ablation softening degree, which comprises the following steps of: S1, determining a target softening degree index according to the physical characteristics of a superhard material to be processed, and scanning and irradiating a predetermined processing area of a superhard material workpiece by adopting a laser beam to ablate and soften the material in the predetermined processing area to obtain a superhard material; forming a softening layer; s2, defining and acquiring a quantitative index of the laser ablation softening degree of the softening layer, wherein the laser ablation softening degree is a parameter used for representing the softening degree of the material relative to the matrix; and S3, based on the laser ablation softening degree obtained in the step S2, subsequent grinding machining process parameters of the super-hard material softening layer are designed, so that cooperative machining of laser pretreatment and mechanical grinding is achieved. Compared with the prior art, the machining quality and precision are improved, the machining resistance and tool loss are reduced, the machining efficiency is improved, and scientific and quantitative design of technological parameters is achieved.

The invention belongs to the field of reliability design, and particularly relates to a data-driven aviation casing reliability design method, which comprises the following steps of: determining a main failure minimum probability index by combining risk analysis according to a fault hazard analysis result in potential failure analysis results, and forming a quantitative design criterion of typical parts; and performing criterion design coding on the failure configuration of the typical part, the qualitative design criterion of the structural strength reliability and the quantitative design criterion of the typical part. According to the method, a multi-layer and failure configuration of a structure-failure mode-failure mechanism of a cartridge receiver component is established, all potential failure mode data are managed by taking the configuration as a basic architecture of a database, and a structure reliability design criterion is extracted from design, processing, assembly and use right life cycle failure avoidance measures, so that the comprehensiveness of the design criterion is ensured, and the reliability of the cartridge receiver component is improved. And through database updating and a linkage mechanism with the design criterion, the real-time performance of the reliability design criterion is ensured.

The application discloses a laminar cooling uniformity optimization method and device, and belongs to the technical field of metallurgical control. The method comprises the following steps: determining a non-uniform distribution mode of primary damping holes and secondary damping holes of a lower header based on process parameters and cooling requirements of a laminar cooling system; constructing a fluid dynamics mathematical model based on the non-uniform distribution mode and the process parameters, so as to show fluid flow characteristics in the lower header with a triple-chamber structure; constructing a comprehensive evaluation function based on the fluid dynamics mathematical model, so as to evaluate cooling performance in the width direction of a strip; and obtaining optimal distribution parameters of the primary damping holes and the secondary damping holes when the comprehensive evaluation function is minimized, so as to configure hole diameter sizes and axial positions. By introducing a quantitative design method based on fluid dynamics theory, pressure loss of cooling water along a path is compensated, precise regulation and control of cooling water flow are realized, cooling uniformity in the width direction of the strip is improved, and consistency of microstructure and mechanical properties of products is ensured.

The application is a phase change material functional matching quantitative design method for SAC, the characteristic starting temperature T1, peak temperature T2 and characteristic termination temperature T3 of the sulphoaluminate cement are obtained through the adiabatic temperature rise test; [T1, T3] is taken as the functional target phase change interval of the phase change material, and the total hydration heat Q in the temperature interval is calculated cem The phase change enthalpy Delta H of the phase change material pcm The functional content M of the phase change material in unit volume of concrete is calculated pcm The aggregate amount is calculated through the absolute volume method, and the concrete mixing ratio is finally determined. The application realizes the accurate matching of the phase change material and the hydration characteristics of the sulphoaluminate cement, and provides an effective temperature control solution for the sulphoaluminate cement concrete construction.

The invention belongs to the field of civil construction engineering, and particularly relates to a design and construction technology of a concrete-filled steel tube structure, in particular to a method for determining an expansion rate limit value of concrete in a concrete-filled steel tube structure and a storage medium. And the selection of the expansion rate is converted from empirical and qualitative judgment to quantitative and scientific design based on a mechanical model. According to the scheme, the expansion characteristic of the concrete material and the strength safety of the steel pipe structure are linked through a rigorous mechanical model for the first time, and the crossing from the empirical material ratio to the quantitative design based on the structural system performance is realized. And a key theoretical tool and a design basis are provided for solving the problem of how to reasonably use the expanding agent, which puzzles the engineering for a long time.

The present application relates to lost foam casting paint technical field, especially to a kind of casting pipe fittings lost foam paint and quantitative design method.The lost foam paint includes the following components according to weight fraction: composite aggregate 78-88 parts, mullite micro powder 6-9 parts, flaky graphite 3-5 parts, boron nitride micro powder 0.6-3 parts, composite reinforcing fiber 0.3-0.6 parts, suspending agent 1.5-2.5 parts, chelating dispersant 0.15-0.35 parts, binder 0.9-1.3 parts, fluxing agent 2.5-4.5 parts, defoaming agent 0.05-0.15 parts, wetting agent 0.03-0.08 parts;Composite aggregate includes quartz powder 57-70 parts, calcined bauxite 18-25 parts;Composite reinforcing fiber is composed of inorganic short fibers and organic short fibers according to mass ratio (4-6):1.The present application realizes accurate stress adaptation of coating and pipe fittings by "global thermal expansion adaptation, local fiber reinforcement, gradient ceramic strengthening" triple anti-cracking strategy.

The invention is applicable to the technical field of network equipment shell design, and provides a design method of an industrial shell and the industrial shell, and the method comprises the following steps: determining the number and arrangement positions of studs by using a stud number algorithm and a stud position algorithm based on the size of a PCB (Printed Circuit Board) of equipment and the maximum effective supporting area bearable by a single stud; a stud is arranged in the shell of the equipment; based on the highest working frequency, conductivity and magnetic conductivity set by the equipment, determining the thickness of a shell shielding layer of the equipment by utilizing a shielding layer thickness calculation algorithm, and determining the maximum allowable size of a vent hole or a gap by utilizing a gap length constraint algorithm; quantitative design of a shell heat dissipation structure, quantitative strength matching of shell reinforcing ribs and a supporting structure, automatic arrangement of PCB supporting studs, and quantitative anti-electromagnetic interference design of shell shielding layer thickness, gap length and ventilation hole layout are achieved. Therefore, the anti-electromagnetic interference capability is remarkably improved while the structural strength and the heat dissipation capability are ensured, and the user experience is further improved.