Table of contents

MEAE is an annual research conference aiming to provide a platform for engineers and scientists to present their ideas and experiences in the fields of Mechanical Engineering and Aerospace Engineering. 2022 8th Asia Conference on Mechanical Engineering and Aerospace Engineering (MEAE 2022) was held on June 9-11, 2022. It was organized by China University of Geosciences (Wuhan) and hosted by School of Mechanical Engineering and Electronic Information of CUG (Wuhan).

This year, MEAE organizing committee held the conference as remote meeting due to the instability of COVID-19. MEAE used ZOOM as the platform holding online conference. The conference was held virtually for 3 days. The test session on the first day was arranged to help authors learn some ZOOM basic functions. After ZOOM basic functions test, most of participants managed to use ZOOM smoothly. Keynote / Invited speeches and author parallel sessions were on the following two days. Presenters made their presentations on the topics of Materials and Mechanical Engineering, Industrial Manufacturing Systems and Control Technology, Mechanical and Electronic Technology and so on. Every presentation was about 15 minutes including 2-3 minutes for Q&A part. Though the authors and speakers couldn't communicate face to face, the passion for involvement wasn't affected.

The proceedings present a selection from papers submitted to the conference from universities, research institutes and industries. All the papers were double-blind reviewed. 28 papers were accepted from 63 submissions to be collected in the conference proceedings-Journal of Physics: Conference Series. Here we would like to thank all the technical program committee members who made great efforts on paper reviewing.

The appreciation also goes to other conference committee members, keynote/invited speakers, session chairs and all the authors, thanks for their understanding, support and efforts. Without their help, MEAE couldn't be held successfully.

Hope all the participants had wonderful time during conference and got fruitful inspirations from the presentations delivered by speakers and authors. Hope to see you next year onsite!

List of Committees, Statement of Peer Review are available in this pdf.

All conference organisers/editors are required to declare details about their peer review. Therefore, please provide the following information:

• Type of peer review: Double-blind

• Conference submission management system: Zmeeting submission system

• Number of submissions received: 63

• Number of submissions sent for review: 52

Number of submissions accepted: 28

• Acceptance Rate (Number of Submissions Accepted / Number of Submissions Received × 100): 44.4%

• Average number of reviews per paper: 2

• Total number of reviewers involved: 29 reviewers

• Any additional info on review process:

1. Preliminary Review

2. The papers passed the first review will be reviewed again from the following aspects: Originality, Innovation, Technical Soundness, Applicability, Presentation & English and Relevance

Contact person for queries: zengzhu@yaang.cn

Chengdu Young Academic Conference Co. Ltd., China

Please submit this form along with the rest of your files on the submission date written in your publishing agreement.

The information you provide will be published as part of your proceedings.

Polycrystalline heterogeneities of grain growth, phase transformation and tensile properties are discussed by metallography, spectroscopy and fractography when choosing laser welding with butt-joint configuration to satisfactorily minimize effect of inappropriate weld pool shape on microstructure and mechanical properties of γʹʹ precipitation hardable nickel-based superalloy in aerospace industry. There is parabolic relationship between weld penetration and diffusion-limited nucleation, growth and coarseness of secondary dendrite arm spacing alongside fusion boundary through nonequilibrium solidification process, which is dendritically susceptible to grain growth variation and metallurgical discontinuities. The amount, size, morphology and distribution of nonequilibrium intermetallic phase near the dendrite boundaries are kinetically and thermodynamically rely on weld pool shape whose crystal structure is incoherent with γ solid solution austenite phase and increases preference for crack initiation and propagation of brittle intergranular and ductile dimple fracture failures to enormously contribute to losses of strength and ductility. Unsymmetrical keyhole weld is thermometallurgically inconvenient for amelioration of microstructure and mechanical properties on either side, and adversely mitigates resistance to hypereutectic-aided dendrite embrittlement. Beneficial grain refinement and suppression of detrimental nonequilibrium intermetallic phase at the same time are challenging. This problem is an integral part of inhomogeneous microstructure and mechanical properties. The finer grain size occurs, the larger grain boundary area is available for Laves/γ eutectic-type reaction and vice versa. Contributions of coarse grain kinetics and metallurgical reaction thermodynamics to weld disintegration and fracture failure mechanism of tensile properties are explained by microstructure characterization of multicomponent and multiphase weld. Finally, it is imperative to dendritically balance these important factors to minimize inevitable interface solidification products and anomalous substructure growth, and reasonably advance superior mechanical properties of reliable weld.

The thermal decomposition process of GAP in a vacuum confined space was measured by Dynamic Pressure-measuring Thermal Analysis(DPTA). In order to avoid the test error, the test process was improved: the method of liquid nitrogen condensation was used to prevent GAP volatilization in the process of vacuum pumping in the reaction test tube, and the vapor pressure at different temperatures was measured by thermogravimetric analysis. The results show that at 80°C to 120°C, the mechanism function of GAP non-isothermal decomposition reaction is Jander equation, the apparent activation energy is 159.8kJ·mol-1, and the pre-exponential factor lnA is 25.8. At the GAP isothermal reaction stage, the mechanism function changes with the temperature. When the temperature increases, the thermal decomposition reaction changes from diffusion reaction to activation reaction. The decomposition rate constant K increases exponentially with increasing temperature. When T=80°C, K=1.27×10-6; when T=120°C, K=36.93×10-6. According to the data of the decomposition time of 0.1% in the temperature range of 80~120 °C, the Semenov equation is lntT = 19039.90/T- 43.012. The storage life is 35.96 years at 25°C.

Weldability-related issues, including asymmetrical weld pool shape, γ phase multicomponent microstructure development, solidification behavior and mechanical properties, of γʹʹ precipitation-strengthened polycrystalline nickel-based superalloy are experimentally analyzed during keyhole laser welding repair. The crucial relationship between them provides weldability improvement opportunities and defect-free high quality weld for feasible aerospace materials laser processing. Attractive neck transition region of weld is more vulnerable to coarser dendrite than bottom part in the vicinity of fusion boundary, and this location is also liable to abundant Laves/γ eutectic phase formation because of heat and solute accumulation. The dominant chemical inhomogeneity brings about microstructure anomalies and irregular morphology to deteriorate hot cracking resistance. Because of thermometallurgical factors of selective alloying partition in the molten pool, partition-resistant Cr is chemically accumulated in dendrite core, while partition-susceptible Ti, Al, Mo and Nb are enriched in high-supersaturation interdendrite region, which consequently result in serious segregation and extensive Nb-rich intermetallic phase formation across solidification interface. Dendrite refinement and aggressive Laves/γ eutectic phase formation suppression are not simultaneously satisfied by low heat input under nonequilibrium solidification conditions. Therefore, mechanical properties are only partially improved by diffusion-limited microstructure refinement as result of phase instability. In other words, reductions of tensile strength and ductility are attributed to brittle Laves/γ eutectic phase formation during terminal stage of solidification. The severity of eutectic reaction thermodynamically depends on nail-shaped keyhole profile, solidification conditions and solute redistribution ahead of solid/liquid interface. Additionally, viable control of weld metallurgical and mechanical properties progressively encourages optimal combination of laser power and welding speed to interdendritically minimize disadvantages of eutectic phase formation by a variety of welding conditions optimization.

The yarn pull-out tests are of great importance to study the frictional energy dissipation mechanism between yarns and the overall deformation behavior of fabrics. In this study, the stress transfer mechanism of the yarn pull-out process of Kevlar 49 woven fabric is investigated by the digital image correlation (DIC) marker method, considering both the warp waves and transverse preload variables, and have analyzed the shear deformation behavior of textile by the change history of fabric shear angle. The results show that the peak load of the yarn pull-out process increases nonlinearly with the increase of the transverse preload force and the number of warp waves, the maximum pull-out displacement of the yarn is sensitive to the preload force only and is largely independent of warp waves. Finally, the finite element (FE) calculation of the single yarn pull-out process was carried out by using the mixed element method with the restart analysis technique, and the numerical simulation results achieved a good match with the peak load of the experimental data.

In this paper, the fatigue damage evolution law and damage failure mode of flexible braided thin film composites are studied by stress fatigue damage test and scanning electron microscopy morphology test of uniaxial 45° off-axis sample. The results show that the failure mode of the specimens with 45°off-axis angle is characterized by fatigue damage of both the matrix and the functional film and the fracture of the fiber bundle has little influence. In addition, the pattern fatigue stress and fatigue life data of the fatigue test of viscose matrix and functional film under different fatigue loads have the rule of linear equation, which has predictive significance on the safety of aircraft.

Vitrimer epoxy resin is a newly developed resin with bond exchange reaction, which has potential applications in the field of recyclable fiber composites. The force-displacement curve of T700 carbon fiber monofilament pulled out from Vitrimer epoxy microdroplet was obtained by the microdrop test, and the interfacial shear strength of the composite system was obtained. Based on the cohesive contact theory, the finite element model (FEM) of the micro-drop test was set up. The calculated force-displacement curve is consistent with experimental data. The fracture strength and parameter characterization of the interface between Vitrimer epoxy and carbon fiber composites are further discussed.

Vanadium effects on the kinetic characteristics of the austenit transformation in Fe-V-C ternary alloys were investigated by microstructure analysis, differential scanning calorimetry (DSC) and the Johnson-Mehl-Avrami-Kolmogorov model (JMAK). The results show that the vanadium gives rise to the refinement of pearlite lamellar spacing before transformation, the original austenite grain size decreases after transformation, and and the increase of the amount of carbide at the grain boundarsy. Studies on kinetics showed that the austenization of the Fe-V-C ternary alloys is characterized by JMAK model involving site saturation nucleation, diffusion-controlled growth, and impingement correction. V increases the diffusion activation energy and decreases the pre-exponential factor for diffusion.

SiC cladding on the alloy surface can significantly improve the high temperature resistance and oxidation resistance of the material. However, heterogeneous cladding usually produces large residual stress and affects the service life of the material. In the process of laser cladding simulated by finite element method, the mechanism of residual stress during SiC deposition on alloy surface is studied by using moving double ellipsoid heat source model. The simulation results show that the residual stress is unevenly distributed near the cladding layer, and the residual stress presents a compression-tension-compression distribution in the thickness direction due to the mixing law of material properties, which provides a reliable numerical prediction method for the residual stress of SiC cladding layer cladding on the alloy base.

Tensile strength, Young modulus, impact strength, creep resistance, recovery measures, and thermal conductivity are used to evaluate the polymer matrix composite containing ceramic particles as degradation of spongy iron by oxidation to a ferric oxide which is used in steelmaking and low-density polyethylene. The results reveal that the mechanical and thermal properties are affected by the ratio of filler particles (360 μm). Six specimens were prepared and tested in time-dependent conditions at a constant temperature. As a result, increasing the filler ratio added to low-density polyethylene does not accelerate creep with nonlinear viscoelastic behavior. The composite with 0.7 percent ferric oxide particles was found to have the best thermal and mechanical qualities.

The studies focus on particle generation from aluminium alloy surfaces irradiated by a Q switched Nd:YAG laser at 355 nm wavelength at low fluencies. The particles number increase with laser fluence but reduces with pulse number. The average initial threshold laser fluence for particles generation is 26.64 mJ/cm2. Larger particle with a diameter more than 5μm are found for fluencies above 76.54 mJ/cm2. After 40 pulsed laser shots at 72 mJ/cm2, it can effectively reduce the generation of metal particles. Our results demonstrated that 7075 aluminum alloy has the best laser resistance and the method of multi-shots laser pretreatment can reduced the generated particles by 76.92%. The SEM results shows that laser pretreatment process lead the passivation effct which smoothed the microstructure on the initial surface. The XPS results shows that zinc aluminate was generated during laser pretreatment process which has good thermodynamic properties. This study has important value for reducing metal particle contamination due to laser irradiation on metal surface in high power laser facilities and improving the service life of optical components.

Selective laser melted 1CP alloy sample was obtained. Sample is partially amorphous, otherwise it consist of α–Fe(Si) and ordered Fe₃Si. In the direction parallel to the axis of the sample the coercivity is slightly lower than in the perpendicular direction and the saturation magnetization is greater. Magnetic anisotropy in sample is not weakened by held annealing: heating of 10 C°/min to 440C°, holding for 30 minutes, followed air cooling. After heat treatment coercivity in the direction parallel to the sample axis decreased from 50 Oe to 38 Oe (34%).

To utilize ammonia-based fuels, it is fundamental to understand chemical mechanisms of combustion process, in which reaction characteristics of such a chemical are described in detail. Detailed chemical-kinetics mechanism of ammonia was modelled by an automatic reaction mechanism generation program to investigate characteristics of premixed combustion for ammonia/hydrogen fuel mixture. To develop an accurate model for practical combustion applications, validation of the reaction mechanism was carried out in terms of laminar flame speed under different conditions. Results suggested that the established mechanism model has satisfying performance under different ammonia/hydrogen ratio conditions. Moreover, comparison with other mechanism models demonstrated that the developed model can be used to describe flame propagation of ammonia/hydrogen fuels. Then characteristics of laminar flame speed were predicted under various ammonia concentration and equivalence ratio conditions. Sensitivity analyses showed that ammonia mole fraction has a prominent impact on kinetics of flame speed for ammonia/hydrogen blends. Flame structure analyses showed that hydrogen can enhance ammonia flames with higher light radical concentrations whilst deteriorate NOx emission in exhaust gases.

Ship deck is generally made of steel materials. With the development of ship technology and the demand of ship lightweight design, a lightweight and modular ship deck is needed. In this paper, a ship deck is designed based on the form of matrix; The deck is mainly made of engineering plastics and filled with load-bearing materials. The overall strength of the material is analyzed by FEM simulation. According to the simulation results, the compressive strength of this grid composite structure is basically equivalent to that of C30 concrete, but the weight can be reduced by 30% compared with C30 concrete The matrix-deck has the characteristics of high strength and low density, and is suitable for occasions with high requirements for material strength and material quality.

In order to realize the efficient and rapid erection and flexible unfolding of super large active array meter wave radar with an area of more than 100 square meters, this study takes a meter wave radar antenna array unfolding and retracting system as the research object, makes a detailed structural design of the unfolding and retracting system, and establishes a three-dimensional model of the unfolding and retracting system on this basis to to Simulate the stiffness and strength of it. The changes of stiffness and strength of the array under different wind loads and wind angles are compared and analyzed. The results show that the unfolding and retracting system has high reliability under the condition of rapid erection and mobility, and has a good application and popularization prospect in the automatic unfolding and retracting system of super large radar array.

In order to investigate the influence of internal flow field on the dynamic characteristics of a pressure reducing valve, based on the new discrete geometric conservation law and high-order coupling algorithm, numerical simulations of the dynamic characteristics have been performed. The three-dimensional unsteady integral forms of ALE equation is solved by finite volume scheme based on the spring analogy method and dynamic grid. The novel techniques of virtual mesh ventilation method is adopted to solve the problem when multiple bodies move from contact to separation and the mesh topology changes. The results show that the outlet pressure of valve oscillates within wide range upstream pressurization rate, the average pressure is close to the theoretical value of static performance design; numerical simulation reappears vibration divergence which is similar to the test phenomenon, flutter phenomenon is caused by the interfere between aerodynamic force and dynamic systems. By modifying the method, the fault can be eliminated.

Synthetic Aperture Radar (SAR) satellite power system has the characteristics of high power, pulse power supply and fast response speed. Based on the combination of domestic and foreign SAR satellite power supply structures, a SAR satellite power supply system scheme with a composite bus architecture is proposed in this paper. By adding battery discharge regulators (BDR) between the platform bus and the SAR load bus as a grid-connected controller, the SAR load bus can supply power to the platform load, and the solar array and battery pack can be used efficiently while achieving dual bus output. Aiming at the composite bus, this paper also proposes an efficient high-power filter technology. Finally, the ground test results verify the correctness of the scheme, which can meet the different power supply requirements of the SAR satellite stable and pulse load equipment.

The real stator bars of an 18kV pumped storage generator were taken as research objects. The multi-factor sequential aging tests of thermal cycling, electrothermal and vibration were carried out. The dielectric loss angle tangent (tanδ), capacitance (C), Δtanδ, ΔC and maximum partial discharge of the samples at different aging periods were measured. The variation of these parameters with aging time was summarized, and the aging mechanism was analysed. The results show that tanδ, Δtanδ, and ΔC increase overall with aging time, while the capacitance decreases slightly with aging time. The maximum partial discharge decreases gradually at beginning of aging, and then increases after aging of 4 periods. All of tanδ, Δtanδ, ΔC and maximum partial discharge increase obviously in the later stages of aging. They can be used as characteristic parameters for multi-factor aging of stator bars insulation of pumped storage generators, to evaluate the aging state of the insulation with epoxy mica.

An efficient and timely emergency response to a major accident is more challenging for the exploration and utilization of deep-sea oil and gas fields due to harsh external environment factors. An optimal solution is needed to tackle the external environment changes in the demand for emergency resources. To effectively balance emergency response time and the satisfaction of resource scheduling quantity, this paper proposes a multiple rescue points and multi-objective optimization model to address such challenges. Such model takes into account the environment factors involving wind speed and wave height caused by the variability of the deep-sea monsoon climate. Additionally, to handle the uncertainty of the resource demand at the accident sites, a linear programming and heuristic hybrid algorithm is proposed to help decision makers select the ideal routes and minimal scheduling time of deep-sea emergency resources, as well as the optimal operation season. A case study of a blowout accident is conducted to demonstrate the application of the proposed model and the real-world implications.

Accurate prediction of the aeroengine remaining useful life (RUL) is essential to improve engine availability and reliability. Aiming at the reliable prediction of residual life of aeroengine system, an engine residual life prediction model based on the fusion of multiscale fusion two-dimensional convolutional neural network and bidirectional long and short term memory (MSCNN-BLSTM) is proposed. Based on the fusion of two-dimensional convolutional neural network and bidirectional long and short time memory (BLSTM) network, the engine medium and advanced features extracted by the convolutional neural network are integrated to make residual life prediction. Finally, C-MAPSS dataset provided by NASA was used for validation. It is shown that the proposed multiscale hybrid model, compared with other model predictions, reduces the performance index score and root mean square error by 32.2% and 14.7% respectively. It can be seen that the data-driven model can effectively extract the information from the degradation data, which improves the prediction performance of aeroengine remaining life.

This paper proposes a novel nadir-pointing guidance method for satellites constrained by the deviation of sun-pointing, to ensure the attitude of the satellite steering smoothly. The main idea of establishing the expected attitude contains two steps. Firstly, establishing a temporary attitude according to the nadir direction and the normal direction of the ecliptic. Secondly, in order to reduce the deviation between the expected Sun-pointing axis and the Sun-pointing direction, the temporary attitude will be rotated along one Euler axis, and ensure that the expected nadir-pointing axis fixed in the nadir direction at the same time. The nadir-pointing method provided in this paper overcomes the singular phenomenon that the expected attitude of the satellite flips, without serious loss of Sun-pointing. In this way, the peak expected angular velocity and the peak power consumption will be greatly reduced.

By analyzing the gas-liquid mixing phenomenon in the thruster pipeline at the end of the service life of geostationary satellite, it is found that the gas in the pipeline leads to insufficient propellant combustion and unstable thrust output, which brings great difficulties to the orbit control of satellite. Aiming at the problem of thrust instability caused by gas-liquid mixing in the process of geostationary satellite orbit control, a joint orbit control method of normal mode + station keeping mode is proposed, which effectively solves the problem of deorbit at the end of the life of geostationary satellite in actual on orbit operation.

In this paper, a numerical calculation method is applied to investigate the influences of ducted propeller aerodynamic configuration parameters. The thrust, torque and power of the propeller in the duct and the decoupled propeller are compared under identical conditions. The performance with equal input power is analysed considering the additional thrust of the duct. The relationships of system thrust, power and efficiency with the axial position of the propeller disk in the duct, the propeller disk diameter and the propeller-duct clearance are investigated.

Air cooling channel is very important to avoid the ablation of ignition spark plug by reducing the temperature on the end face, and thus increase the service life of the spark plug. For a typical aero-engine ignition spark plug, coupled simulation model describing the flow in the air cooling channel as well as the heat transfer overall the spark plug has been established with a CFD software. Orthogonal experiments have been performed to analyze the influence of the design parameters on the air flowrate and end surface temperature On the basis of orthogonal experiment, the cooling channel is optimized by multi-factor analysis of variance The results demonstrate that: (1) The most important issue that influence the overall flowrate in cooling channel and the maximum temperature on the ignition end face is the number of holes on end face, and second one is the outlet diameter, while the influence of inlet diameter is not significant. (2) There is a better structural design for the cooling channel of the spark plug. The optimized air cooling channel increases the volume flow rate by 52.21% compared to the original scheme, which helps maintain the maximum temperature of the ignition end face of the spark plug below 368.2°C.

In this article, a crankshaft design has been made for a compression ignition internal combustion engine that is planned to be used in an aerial vehicle. Alternative models were designed as hollow pins with different diameters. Finite element analysis was performed on 1 reference model and 3 alternative models using AISI 1045 and AISI 4140 materials. As the hollow diameter increases for both materials; maximum of equivalent stress has increased and minimum of safety factor has decreased. As a result of the study, it has been evaluated that the alternative 3 with AISI 4140 material is suitable for use on the crankshaft.

To achieve the best shock absorption effect of the hexapod robot, the influence of three leg structures on the stability of the hexapod robot under different path environments was studied, and a set of highly implementable solutions was designed. Use SolidWorks to build a hexapod robot model, import it into ADAMS to build a dynamic model and build different path environments, and conduct forward and inverse kinematics analysis at the same time. Using the Simulink plug-in in MATLAB and ADAMS joint kinematics simulation, the spring damping and magnetorheological fluid components are established in Simulink, which are connected in parallel with the model in ADMAS, and the stability of the hexapod robot under three-leg structures in different environments is obtained. According to the results, the optimal shock-absorbing leg structure is obtained.

In order to overcome the limitation of fuel supply to the nozzle of an aero-engine, a nozzle with two main and secondary fuel paths and accompanied by air-assisted atomization can be used to solve this kind of problem. The two fuel paths make the fuel centrifugal and direct injection respectively, which can achieve the purpose of combining the advantages of centrifugal and direct injection nozzles, thus realizing a wide working range of fuel flow. The results show that when the fuel pressure reach a certain range, the main and secondary fuel lines start to work simultaneously, the atomization cone angle and fuel flow rate increase with the increase of pressure, and when the pressure reaches a certain value, continuing to increase the fuel pressure has little effect on the atomization angle. For the case of air supply and simultaneous operation of the main and secondary fuel lines, with the increase of fuel pressure, the atomization particle size changes gradually and evenly and has a tendency to increase, which is in line with the expected goal.

In this paper, the ducted propeller configuration is optimized using the geometry parameterization method and proposed Newton method with the total system thrust as the optimization objective and the maximum torque as the constraint. Based on the initial model, the propeller geometry is optimized by decoupling the ducted propeller, and iterations are carried out until the optimization converges. The propeller optimization primarily consists of an increase in the thickness of the propeller root wing and the torsion angle of the middle wing, and a reduction in the curvature of the propeller tip. The ducted propeller system has a 6.29% improvement in thrust after aerodynamic optimization.

The inner cylinder embedded fluidlastic base is a device installed on the main reduction transmission channel of the helicopter to isolate the vibration load of the fuselage from the rotor system, whose vibration isolation efficiency is quite high. Compared with the traditional combined fluidlatic isolator, the fluidlastic base has higher reliability and safety in engineering application prospects. In this paper, taking a UAV as the research object, the structure of the fluidlastic base is preliminarily designed in light of structure space of its main reduction system, and its dynamic equation is established according to the working principle of the fluidlastic base to deduce the force transmission rate expression. Finally, taking the minimum force transmission rate as the research target, sensitivity analysis of the structural parameters is carried out for the fluidlastic base, which provides an optimization method for the optimal design of the vibration isolator.