Mechanics & Industry最新文献_第3页

THEA-CODE: a design tool for the conceptual design of hybrid-electric aircraft with conventional or unconventional airframe configurations THEA-CODE:用于混合动力飞机概念设计的设计工具，具有传统或非常规的机身结构

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2021-01-01 DOI: 10.1051/MECA/2021012

G. Palaia, D. Zanetti, K. Abu Salem, V. Cipolla, V. Binante

引用次数: 22

Research on the estimation method of the point-of-interest (POI) displacement for ultra-precision flexible motion system based on functional optical fiber sensor 基于功能光纤传感器的超精密柔性运动系统POI位移估计方法研究

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2021-01-01 DOI: 10.1051/meca/2021047

Yujie Li, Ming Zhang, Yu Zhu

{"title":"Research on the estimation method of the point-of-interest (POI) displacement for ultra-precision flexible motion system based on functional optical fiber sensor","authors":"Yujie Li, Ming Zhang, Yu Zhu","doi":"10.1051/meca/2021047","DOIUrl":"https://doi.org/10.1051/meca/2021047","url":null,"abstract":"This paper proposes a POI displacement estimation method based on the functional optical fiber sensor and the phase modulation principle to improve the POI displacement estimation accuracy. First, the relation between the object deformation and the optic fiber lightwave phase is explained; the measurement principle of functional optical fiber sensor based on the heterodyne interference principle and its layout optimization method is proposed, and a POI displacement estimation model is presented based on the data approach. Secondly, a beam is taken as the simulation object, the optimal position and length of the optical fiber sensor are determined based on its simulation data. Finally, the experimental device is designed to verify the effectiveness of the POI displacement estimation method based on the optic fiber sensors. The frequency-domain plot of the signals shows that the optical fiber sensors can express the flexible deformation of the analyzed object well. The POI displacement estimation model with the fiber optic sensor signals as one of the inputs is constructed. Through estimating the test data, the error using the optical fiber sensor-based POI displacement estimation method proposed in this paper reduces by more than 61% compared to the rigid body-based assumption estimation method.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76782800","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

Dynamics of on-board rotors on finite-length journal bearings subject to multi-axial and multi-frequency excitations: numerical and experimental investigations 有限长滑动轴承上转子在多轴多频激励下的动力学:数值和实验研究

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2021-01-01 DOI: 10.1051/MECA/2021034

Y. Briend, E. Châtelet, R. Dufour, Marie-Ange Andrianoely, F. Legrand, S. Baudin

{"title":"Dynamics of on-board rotors on finite-length journal bearings subject to multi-axial and multi-frequency excitations: numerical and experimental investigations","authors":"Y. Briend, E. Châtelet, R. Dufour, Marie-Ange Andrianoely, F. Legrand, S. Baudin","doi":"10.1051/MECA/2021034","DOIUrl":"https://doi.org/10.1051/MECA/2021034","url":null,"abstract":"On-board rotating machinery subject to multi-axial excitations is encountered in a wide variety of high-technology applications. Such excitations combined with mass unbalance forces play a considerable role in their integrity because they can cause parametric instability and rotor–stator interactions. Consequently, predicting the rotordynamics of such machines is crucial to avoid triggering undesirable phenomena or at least limiting their impacts. In this context, the present paper proposes an experimental validation of a numerical model of a rotor-shaft-hydrodynamic bearings system mounted on a moving base. The model is based on a finite element approach with Timoshenko beam elements having six degrees of freedom (DOF) per node to account for the bending, torsion and axial motions. Classical 2D rectangular finite elements are also employed to obtain the pressure field acting inside the hydrodynamic bearing. The finite element formulation is based on a variational inequality approach leading to the Reynolds boundary conditions. The experimental validation of the model is carried out with a rotor test rig, designed, built, instrumented and mounted on a 6-DOF hydraulic shaker. The rotor’s dynamic behavior in bending, torsion and axial motions is assessed with base motions consisting of mono- and multi-axial translations and rotations with harmonic, random and chirp sine profiles. The comparison of the predicted and measured results achieved in terms of shaft orbits, full spectrums, transient history responses and power spectral densities is very satisfactory, permitting the experimental validation of the model proposed.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85229149","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: 3

Improved analytical model for cylindrical compression springs not ground considering end behavior of end coils 考虑端面线圈端面特性的非接地圆柱压缩弹簧的改进解析模型

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2021-01-01 DOI: 10.1051/meca/2021048

Guillaume Cadet, M. Paredes, Hervé Orcière

{"title":"Improved analytical model for cylindrical compression springs not ground considering end behavior of end coils","authors":"Guillaume Cadet, M. Paredes, Hervé Orcière","doi":"10.1051/meca/2021048","DOIUrl":"https://doi.org/10.1051/meca/2021048","url":null,"abstract":"In a context of increased competition, companies are looking to optimize all the components of their systems. They use compression springs with constant pitch for their linear force/length relationship. However, it appears that the classic formula determining the global load-length of the spring is not always accurate enough. It does not consider the effects of the spring's ends, which can induce non-linear behaviour at the beginning of compression and thus propagate an error over the full load-length estimated. The paper investigates the entire behaviour of a cylindrical compression spring, not ground, using analytical, simulation and experimental approaches in order to help engineers design compression springs with greater accuracy. It is built with an analytical finite element method, considering all the geometry and force components of the spring. As a result, the global load-length of compression springs can be calculated with more accuracy. Moreover, it is now possible to determine the effective tri-linear load-length relation of compression springs not ground and thus to enlarge the operating range commonly defined by standards. This study is the first that enables the behaviour to be calculated quickly, by saving time on dimensioning optimisation and on the manufacturing process of compression springs not ground.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87732656","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

Design and experimental study of electrical and mechanical brake for mine hoist 矿井提升机电制动器的设计与试验研究

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2021-01-01 DOI: 10.1051/MECA/2021033

H. Jin, Huanyu Huo, Chuanli Wang, Shun Wang, Huwei Xu

引用次数: 3

A study on the high-efficiency mixer of the SCR system SCR系统高效混合器的研究

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2021-01-01 DOI: 10.1051/MECA/2020101

K. Lu, Dewen Liu, Yan Wu, Shusen Liu, Shuzhan Bai

引用次数: 7

Tools and methodologies for box-wing aircraft conceptual aerodynamic design and aeromechanic analysis 箱翼飞机概念气动设计和气动力学分析的工具和方法

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2021-01-01 DOI: 10.1051/meca/2021037

K. Abu Salem, Palaia Giuseppe, Cipolla Vittorio, Binante Vincenzo, Zanetti Davide, Chiarelli Mario

{"title":"Tools and methodologies for box-wing aircraft conceptual aerodynamic design and aeromechanic analysis","authors":"K. Abu Salem, Palaia Giuseppe, Cipolla Vittorio, Binante Vincenzo, Zanetti Davide, Chiarelli Mario","doi":"10.1051/meca/2021037","DOIUrl":"https://doi.org/10.1051/meca/2021037","url":null,"abstract":"A way to face the challenge of moving towards a new greener aviation is to exploit disruptive aircraft architectures; one of the most promising concept is the PrandtlPlane, a box-wing aircraft based on the Prandtl's studies on multiplane lifting systems. A box-wing designed accordingly the Prandtl “best wing system” minimizes the induced drag for given lift and span, and thus it has the potential to reduce fuel consumption and noxious emissions. For disruptive aerodynamic concepts, physic-based aerodynamic design is needed from the very early stages of the design process, because of the lack of available statistical data; this paper describes two different in-house developed aerodynamic design tools for the PrandtlPlane conceptual aerodynamic design: AEROSTATE, for the design of the box-wing lifting system in cruise condition, and THeLMA, aiming to define the layout of control surfaces and high lift devices. These two tools have been extensively used to explore the feasible space for the aerodynamic design of the box-wing architecture, aiming to define preliminary correlations between performance and design variables, and guidelines to properly initialize the design process. As a result, relevant correlations have been identified between the rear-front wing loading ratio and the performance in cruise condition, and for the rear-front flap deflections and the aeromechanic characteristics in low speed condition.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87330801","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: 15

Wear assessment model for cylinder liner of internal combustion engine under fuzzy uncertainty 模糊不确定条件下内燃机缸套磨损评估模型

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2021-01-01 DOI: 10.1051/MECA/2021028

Jianxiong Kang, Yanjun Lu, Hongbo Luo, Jie Li, Yutao Hou, Yongfang Zhang

引用次数: 5

Real contact ratio and tooth bending stress calculation for plastic/plastic and plastic/steel spur gears 塑料/塑料和塑料/钢正齿轮的实接触比和齿弯应力计算

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2021-01-01 DOI: 10.1051/MECA/2021029

T. Jabbour, Ghazi Asmar, M. Abdulwahab, J. Nasr

引用次数: 1

ORES: a chassis dynamometer for off-road vehicles ORES:用于越野车辆的底盘测功机

IF 1.2 4区工程技术

Mechanics & Industry Pub Date : 2021-01-01 DOI: 10.1051/MECA/2021004

Husain Kanchwala

{"title":"ORES: a chassis dynamometer for off-road vehicles","authors":"Husain Kanchwala","doi":"10.1051/MECA/2021004","DOIUrl":"https://doi.org/10.1051/MECA/2021004","url":null,"abstract":"Off-Road Environment Simulator (ORES) is a Real-time Hardware-in-the-Loop (RT-HIL) platform to simulate the dynamic response of off-road vehicles. This paper primarily focuses on the vehicle model development and validation using both field and rig testing using the ORES platform. Off-road vehicles are capable of operating on bumpy terrains where they are subjected to different resistive wheel torques due to non-unique ground friction conditions and wheel loads. If the powertrain torque output is not distributed in accordance with the resistive wheel torques, it may lead to transmission windup resulting in premature failure of various driveline components. In this study, the vehicle is driven over discrete bumps both in rig simulation and field trial. Different terrain enveloping models were evaluated namely the single point, radial-spring contact model and two-point follower (using circular and sinusoidal basis). These models were evaluated against the measured wheel acceleration responses. The two-point follower with sinusoidal basis strongly correlates with the measured responses and the ground excitations so obtained were used as inputs to a seven degree-of-freedom vehicle ride model. Ride model calculates the wheel loads and is eventually integrated with longitudinal dynamics, tire, driveline and test-rig models. Vehicle axle acceleration, wheel speed and drive torque responses are measured for validating the simulation results against field and rig trials. The field responses matches fairly well which validates the suitability of the proposed modeling approach.","PeriodicalId":49018,"journal":{"name":"Mechanics & Industry","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81969526","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: 3