Advances in Mechanical Engineering最新文献_第6页

Speed control of marine main thruster motor based on super-twisting sliding mode variable structure 基于超扭转滑模变结构的船舶主推力器电机速度控制

4区工程技术

Advances in Mechanical Engineering Pub Date : 2023-09-01 DOI: 10.1177/16878132231184061

Yan Langtao, Ren Yiran, Jin Zhihui, Zhang Jianfeng

引用次数: 0

Computational approach for the acoustic modelling of large aftertreatment devices with multimodal incident sound fields 具有多模态入射声场的大型后处理装置声学建模的计算方法

4区工程技术

Advances in Mechanical Engineering Pub Date : 2023-09-01 DOI: 10.1177/16878132231199870

Eva María Sánchez-Orgaz, Francisco David Denia, Jose Martínez-Casas, Javier Carballeira

{"title":"Computational approach for the acoustic modelling of large aftertreatment devices with multimodal incident sound fields","authors":"Eva María Sánchez-Orgaz, Francisco David Denia, Jose Martínez-Casas, Javier Carballeira","doi":"10.1177/16878132231199870","DOIUrl":"https://doi.org/10.1177/16878132231199870","url":null,"abstract":"The influence of multimodal incident sound fields on the acoustic behaviour of large aftertreatment devices incorporating a monolith is modelled and analysed in detail. The analytical mode matching method is applied to the compatibility conditions of the three-dimensional acoustic fields at the device geometric discontinuities, leading to the computation of the complex wave amplitudes in all the subdomains involved and the corresponding device transmission loss. To have a realistic model, three-dimensional propagation must be considered in the inlet/outlet ducts and chambers, while one-dimensional wave propagation has to be assumed along the small capillaries of the aftertreatment device monolith (such catalytic converters and particulate filters); therefore, the monolith can be replaced by a plane wave four-pole transfer matrix from an acoustical point of view. On the other hand, for large aftertreatment device inlet ducts such as those found in heavy-duty and off-road engines, the usual models with plane incident wave excitation are not accurate since the onset of higher order incident modes in the inlet duct is expected for the frequency range of interest. Therefore, a variation of the acoustic attenuation performance is likely to occur depending on these modes, similar to the results previously found in the case of large dissipative silencers. Results are presented for three different multimodal incident sound field hypotheses: equal modal amplitude, equal modal power and equal modal energy density. A relevant influence on the sound attenuation is found for the test problems considered in the current investigation.","PeriodicalId":49110,"journal":{"name":"Advances in Mechanical Engineering","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135427538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Impact of hydrogen direct injection on engine combustion and emissions in a GDI engine 直喷氢气对发动机燃烧和排放的影响

4区工程技术

Advances in Mechanical Engineering Pub Date : 2023-09-01 DOI: 10.1177/16878132231189117

Lei Wang, Haiyu Li, Zhaoming Huang, Li Wang, Weiguo Chen

{"title":"Impact of hydrogen direct injection on engine combustion and emissions in a GDI engine","authors":"Lei Wang, Haiyu Li, Zhaoming Huang, Li Wang, Weiguo Chen","doi":"10.1177/16878132231189117","DOIUrl":"https://doi.org/10.1177/16878132231189117","url":null,"abstract":"The combustion and emission characteristics of a hydrogen engine were investigated through experimental analysis using a GDI engine. To enable hydrogen in-cylinder direct injection, a specialized hydrogen gas injector was employed. A comparative analysis of the combustion performance between gasoline and hydrogen fuels in a spark-ignited engine was conducted. Additionally, the study experimentally explored the thermal efficiency and emission reduction potential of hydrogen engines in lean combustion modes. The results indicated a significant improvement in the combustion rate when hydrogen fuel was utilized in the spark-ignited engine. However, the effective thermal efficiency was found to be lower than that of gasoline fuel due to the delayed MBF50 under stoichiometric conditions. Furthermore, when compared to gasoline fuel, the reduction of CO and THC emissions was accompanied by an increase in NOx emissions. Nevertheless, optimizing the air dilution ratio in hydrogen engines led to an improvement in the effective thermal efficiency. Specifically, under medium load conditions, a Lambda value of 2.7 resulted in an effective thermal efficiency of 43.5%. Additionally, under ultra-lean conditions (Lambda > 2.3), NOx emissions could be reduced to below 50 ppm, reaching as low as 44 ppm. This study highlights the potential of improving combustion efficiency and reducing emissions by utilizing hydrogen fuel, particularly in lean combustion modes. It contributes to the continuous development of hydrogen engine technology and promotes the implementation of cleaner and more efficient energy solutions.","PeriodicalId":49110,"journal":{"name":"Advances in Mechanical Engineering","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135427552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical investigation of turbulent mixed convection in a round bottom flask using a hybrid nanofluid 混合纳米流体对圆底烧瓶内湍流混合对流的数值研究

4区工程技术

Advances in Mechanical Engineering Pub Date : 2023-09-01 DOI: 10.1177/16878132231195022

Adel Baiti, Hicham Salhi, Nadjib Chafai

引用次数: 0

Time-optimal trajectory planning for autonomous parking of tractor-semitrailer vehicle based on piecewise Gauss pseudospectral method 基于分段高斯伪谱法的牵引车-半挂车自主泊车时间最优轨迹规划

IF 2.1 4区工程技术

Advances in Mechanical Engineering Pub Date : 2023-08-01 DOI: 10.1177/16878132231188829

Duoyang Qiu, Minglong Cheng, Hao Yang, Yuefang Dai, Y. Wang

{"title":"Time-optimal trajectory planning for autonomous parking of tractor-semitrailer vehicle based on piecewise Gauss pseudospectral method","authors":"Duoyang Qiu, Minglong Cheng, Hao Yang, Yuefang Dai, Y. Wang","doi":"10.1177/16878132231188829","DOIUrl":"https://doi.org/10.1177/16878132231188829","url":null,"abstract":"For the autonomous parking problem of the tractor-semitrailer vehicle, a piecewise Gauss pseudospectral method is proposed as a trajectory planning scheme in this paper. Firstly, the trajectory planning problem is transformed into an optimal control problem by establishing a vehicle kinematics model for the low-velocity scene, the dynamic constraints including the physical constraints, the collision avoidance constraints, and the endpoint constraints. The optimal control problem are discretized into a nonlinear programming problem by piecewise Gauss pseudospectral method according to the movement area during parking process. The shortest time to complete parking is taken as the objective function. The Gauss pseudospectral method is further adopted to solve the nonlinear programming problem in the two parking stages. Three parallel parking conditions with different lengths of parking spaces and three vertical parking conditions with different widths of parking spaces are set for simulation verification based on Matlab/Simulink. The simulation results show that the proposed method can uniformly and effectively solve the trajectory planning problem of the tractor-semitrailer vehicle. Compared with the traditional pseudospectral method, a shorter parking time and a significantly higher convergence rate can be got with the method, which further indicates that the proposed method has good effectiveness and robustness.","PeriodicalId":49110,"journal":{"name":"Advances in Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46094803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on mechanical efficiency of 65 ml/r fuel pump and its piston optimization 65 ml/r燃油泵机械效率及活塞优化研究

IF 2.1 4区工程技术

Advances in Mechanical Engineering Pub Date : 2023-08-01 DOI: 10.1177/16878132231189676

Yang-Xi Ding, Chenchen Zhang, Chuan-De Ruan, Chengwei Tong, J. Ruan

{"title":"Study on mechanical efficiency of 65 ml/r fuel pump and its piston optimization","authors":"Yang-Xi Ding, Chenchen Zhang, Chuan-De Ruan, Chengwei Tong, J. Ruan","doi":"10.1177/16878132231189676","DOIUrl":"https://doi.org/10.1177/16878132231189676","url":null,"abstract":"The 65 ml/r fuel pump proposed in this paper is a new type of large-displacement piston pump. The pump is of the roller plunger type construction. This structure enables the pump to have good performance even under high and variable speed conditions. Firstly, force analysis of this pump and establishment of mathematical model of pump mechanical efficiency. The influence of load pressure and speed on mechanical efficiency was obtained by numerical simulation through matlab. Then the prototype was designed and manufactured. The pump outlet pressure, outlet flow rate, and torque were measured on the test bench under various load pressure and speed, and mechanical efficiency of pump at various load pressure and speed was got. The experimental data and simulation are close. 65 ml/r fuel pump has a volumetric efficiency of 99% and a mechanical efficiency of 58.6% at a load pressure of 3 MPa and a speed of 1500 rpm. From experimental results, 65 ml/r fuel pump volumetric efficiency is high, but there is a problem of low mechanical efficiency. The piston of pump will be optimized for improved mechanical efficiency of pump. Then mechanical efficiency of the optimized pump is calculated and compared with mechanical efficiency before optimization. Results show that piston optimization will increase mechanical efficiency of pump.","PeriodicalId":49110,"journal":{"name":"Advances in Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42571279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual predictive model adaptive switching control for directional control of tractor semitrailer combinations 牵引车半挂车组合方向控制的双预测模型自适应切换控制

IF 2.1 4区工程技术

Advances in Mechanical Engineering Pub Date : 2023-08-01 DOI: 10.1177/16878132231189311

Xiaobing Chen, Yao Qiang

{"title":"Dual predictive model adaptive switching control for directional control of tractor semitrailer combinations","authors":"Xiaobing Chen, Yao Qiang","doi":"10.1177/16878132231189311","DOIUrl":"https://doi.org/10.1177/16878132231189311","url":null,"abstract":"In order to ensure that safety and reliability of tractor semitrailer combinations (TSCs) on the road, the human drivers’ steering decisions need to comprehensively consider the trajectories and states of the tractor and semitrailer. For this purpose, a dual predictive model adaptive switching control decision for directional control is proposed. Firstly, a multi-point preview algorithm and a general regression neural network are designed to percept the current local target paths for the tractor and semitrailer. Then, a kinematic predictive model control algorithm for low-speed path tracking control and a dynamic predictive model control algorithm for high-speed path following and lateral stability control are established respectively. In addition, an S-type switching function is introduced to realize smooth switching between the two control algorithms. Finally, the directional control decision in this study is validated by the numerical simulations under different conditions and compared with single-point preview driver and the MPC driver without considering semitrailer. The results show that the proposed approach can accurately track the target path and effectively improve the high-speed lateral stability.","PeriodicalId":49110,"journal":{"name":"Advances in Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42903168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using a spherical inverted pendulum and statokinesigram for modeling and evaluating quiet standing posture 利用球面倒立摆和静立图对静立姿势进行建模和评价

IF 2.1 4区工程技术

Advances in Mechanical Engineering Pub Date : 2023-08-01 DOI: 10.1177/16878132231190993

Hussam K Abdul-Ameer

{"title":"Using a spherical inverted pendulum and statokinesigram for modeling and evaluating quiet standing posture","authors":"Hussam K Abdul-Ameer","doi":"10.1177/16878132231190993","DOIUrl":"https://doi.org/10.1177/16878132231190993","url":null,"abstract":"This paper proposes a new approach to model and analyze erect posture, based on a spherical inverted pendulum which is used to mimic the body posture. The pendulum oscillates in two directions, θ and ϕ , from which the mathematical model was derived and two torque components in oscillation directions were introduced. They are estimated using stabilometric data acquired by a foot pressure mapping system. The model was quantitatively investigated using data from 19 participants, who were first were classified into three groups, according to the foot arch-index. Stabilometric data were then collected and fed into the model to estimate the torque’s components. The components were statistically processed, and the results revealed that the components in direction θ are able to reject intrinsic perturbation. The frequency spectrum of the components in direction ϕ was processed using fast Fourier transform, and the results showed the feasibility of the component in segregating foot deformities. In addition, high-arched foot cases tended to be more stable than other cases because the exerted torque is less. The torque profiles estimated by our model were compared with the profiles derived from a classical inverted pendulum. In most cases, our results showed a significant change (t-test p < 0.05).","PeriodicalId":49110,"journal":{"name":"Advances in Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43357758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A method to remanufacture large-size spiral bevel gear with ease-off topology modification by face-milled generator 一种利用面铣削铣床对大尺寸螺旋锥齿轮进行缓动拓扑修饰的再制造方法

IF 2.1 4区工程技术

Advances in Mechanical Engineering Pub Date : 2023-08-01 DOI: 10.1177/16878132231194322

Longlong Geng, S. Nie, Bo Zhao, Chuang Jiang

{"title":"A method to remanufacture large-size spiral bevel gear with ease-off topology modification by face-milled generator","authors":"Longlong Geng, S. Nie, Bo Zhao, Chuang Jiang","doi":"10.1177/16878132231194322","DOIUrl":"https://doi.org/10.1177/16878132231194322","url":null,"abstract":"Spiral bevel gears are manufactured and used in pairs. When one part usually pinion fatigued, the pair will be replaced. It inevitably leads to a waste of resources and time. To solve this phenomenon, a method to remanufacture pinion with ease-off topology modification is proposed. First, the wheel and pinion were measured to fitting tooth surface, and then a conjugate surface of wheel fitting tooth surface was derived. Secondly, an ease-off topology surface was superimposed to the conjugate surface to improve mesh performance, and then a design tooth surface was obtained. Thirdly, a mathematical model to process pinion was established and original machine-tool settings parameters of pinion were calculated. The deviations between design and original tooth surface of pinion were count, and an error correction model of tooth surface was established to adjust machine-tool settings parameters. Finally, an experimental verification was conducted. The pinion was remanufactured by a face-milled generator and the mesh performance was consistent with design. The result demonstrates the method proposed is effectiveness and feasible. It provides reference for the remanufacture of large-size spiral bevel gears and has good value for engineering application.","PeriodicalId":49110,"journal":{"name":"Advances in Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42313735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and analysis of thermal protection and load-bearing integrated structure of the telescopic wing 伸缩翼热防护与承载一体化结构的设计与分析

IF 2.1 4区工程技术

Advances in Mechanical Engineering Pub Date : 2023-08-01 DOI: 10.1177/16878132231193865

Hong Xiao, Hongwei Guo, Chunfeng Li, Dongdong Xie, Chunlei Xie, Rongqiang Liu

{"title":"Design and analysis of thermal protection and load-bearing integrated structure of the telescopic wing","authors":"Hong Xiao, Hongwei Guo, Chunfeng Li, Dongdong Xie, Chunlei Xie, Rongqiang Liu","doi":"10.1177/16878132231193865","DOIUrl":"https://doi.org/10.1177/16878132231193865","url":null,"abstract":"A novel three-layer integrated structure was designed to meet the thermal-insulation and load-bearing requirements of high-speed telescopic wing aircraft. The structure consists of heat shield layer, load-bearing skeleton, and pyramid lattice structure filled with aerogel to achieve the insulation function. Sensitivity analysis of the design parameters and optimal design of the integrated structure was carried out, and the structure was optimized by using response surface method. Compared to the initial structure, the optimized structure has an equivalent thermal conductivity of 0.0276, reduced by 40%, and a relative density of 685 . 5 kg / m 3 , reduced by 3.7%. And it has a thermal conductivity that is over 20% lower than that of ceramic insulating tiles. Then, the integrated structure was regarded as a homogeneous plate, and the equivalent mechanical and thermal parameters were determined and verified by simulation and experimental results. The equivalence error was controlled within 10%. Finally, a simulation model of the telescopic wing was established. The result shows that the maximum deformation under 20 kPa surface pressure is 3.96 mm. The temperature resistance of the structure surface is up to 1500°C, and the wing internal temperature is controlled within 200°C after 1200 s of thermal loading. The results verified that the integrated structure meets the requirement of a high-speed telescopic wing.","PeriodicalId":49110,"journal":{"name":"Advances in Mechanical Engineering","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49378027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0