Acta Mechanica et Automatica最新文献_第9页

A Flywheel-Based Regenerative Braking System for Railway Vehicles 基于飞轮的铁道车辆再生制动系统

IF 0.7

Acta Mechanica et Automatica Pub Date : 2023-01-01 DOI: 10.2478/ama-2023-0006

J. Jackiewicz

{"title":"A Flywheel-Based Regenerative Braking System for Railway Vehicles","authors":"J. Jackiewicz","doi":"10.2478/ama-2023-0006","DOIUrl":"https://doi.org/10.2478/ama-2023-0006","url":null,"abstract":"Abstract Regenerative braking is a technique that employs electric motors to convert the dynamic mechanical energy from the motor’s spinning rotor and any attached loads into electricity. However, such a type of regenerative braking can only slow but not stop the vehicle because there is too little energy to excite the motor acting as a generator at low speeds. Therefore, this paper presents a unique flywheel-based regenerative braking system for railway vehicles. This system is supposed to meet high safety and comfort expectations in all operating conditions. The braking action control of this system should allow braking of empty or loaded vehicles according to load, the anti-blockage braking action of wheels and prevent wheel-slide during braking or wheel slip during acceleration. The new regenerative braking system under development, like any kinetic energy recovery system, requires the application of continuously variable transmission. The essence of the new solution is to design and build this type of variable transmission using only one planetary gear controlled through the powertrain control module for an electric motor cooperating concurrently. This paper describes complete modelling and simulation realisation on a closed-loop servomotor drive, which cooperates with the variable transmission of the regenerative braking system based on the Scilab/Xcos environment.","PeriodicalId":44942,"journal":{"name":"Acta Mechanica et Automatica","volume":"17 1","pages":"52 - 59"},"PeriodicalIF":0.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46682985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Influence of a Hybrid Manual–Electric Wheelchair Propulsion System on the User’s Muscular Effort 手动-电动混合轮椅推进系统对使用者肌肉力量的影响

IF 0.7

Acta Mechanica et Automatica Pub Date : 2023-01-01 DOI: 10.2478/ama-2023-0003

B. Wieczorek, Ł. Warguła, M. Kukla

{"title":"Influence of a Hybrid Manual–Electric Wheelchair Propulsion System on the User’s Muscular Effort","authors":"B. Wieczorek, Ł. Warguła, M. Kukla","doi":"10.2478/ama-2023-0003","DOIUrl":"https://doi.org/10.2478/ama-2023-0003","url":null,"abstract":"Abstract Self-propelled wheelchairs favour the rehabilitation process, forcing the user to be physically active. Unfortunately, in most cases, the manual propulsion is not adapted to the individual needs and physical capabilities of the user. This paper presents the results of operational tests of a wheelchair equipped with a hybrid propulsion system in which the muscle strength generated by the user is assisted by two independent electric motors. The research aimed to investigate the influence of the applied control algorithm and the assistance factor (W) on the value of the muscular effort (MA) while propelling the wheelchair with the use of push rims. A modified ARmedical AR-405 wheelchair equipped with two MagicPie 5 electric motors built into the wheelchair’s hubs with a power of 500 W was used in this research. The tests were carried out on a wheelchair test bench simulating the moment of resistance within the range of 8–11 Nm. Surface electromyography was employed for the measurement of MA, specifically, a four-channel Noraxon Mini DTS apparatus. The research was carried out on five patients from the group of C50 anthropometric dimensions. The effort was measured for four muscles: deltoid–anterior part, deltoid–posteriori part, and triceps brachii and extensor carpi radialis longus. The effectiveness of the hybrid propulsion system was observed based on the extensor carpi radialis longus muscle. In this case, for the standard wheelchair, the MA ranged from 93% to 123%. In contrast, for a wheelchair equipped with the hybrid propulsion system, at W = 70%, the MA was within the range of 43%–75%.","PeriodicalId":44942,"journal":{"name":"Acta Mechanica et Automatica","volume":"17 1","pages":"28 - 34"},"PeriodicalIF":0.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49503023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of a Height-Adjustable Boarding System for a New Double-Deck Railway Vehicle 新型双层铁路车辆高度可调登车系统的设计

IF 0.7

Acta Mechanica et Automatica Pub Date : 2023-01-01 DOI: 10.2478/ama-2023-0005

P. Šťastniak, Michal Rakár, Jakub Tížek

引用次数: 0

Analytical Approach for Vehicle Body Structures Behaviour Under Crash at Aspects of Overloading and Crumple Zone Length 超载和碰撞区长度对车身结构碰撞行为的分析方法

IF 0.7

Acta Mechanica et Automatica Pub Date : 2023-01-01 DOI: 10.2478/ama-2023-0008

D. Kurpisz, Maciej Obst, T. Szymczak, Radosław Wilde

{"title":"Analytical Approach for Vehicle Body Structures Behaviour Under Crash at Aspects of Overloading and Crumple Zone Length","authors":"D. Kurpisz, Maciej Obst, T. Szymczak, Radosław Wilde","doi":"10.2478/ama-2023-0008","DOIUrl":"https://doi.org/10.2478/ama-2023-0008","url":null,"abstract":"Abstract Road safety problem is still topical, especially since the number of vehicles and the volume of traffic are increasing. It is possible to increase the safety of road users through systemic changes in many areas related to transport. The deformation of the vehicle body during an accident has an impact on the loads acting on the passengers. Vehicle body deformation depends on complex parameters, and knowledge of these parameters is essential for designing crumple zones and the accident reconstruction process. Knowledge of the mechanical parameters of the vehicle structure during deformation is also a reference to passenger injury indicators assessment. This paper reports results from the analytical approach for determining the protection level of personal vehicles. The proposed conception is based on the results from the static stiffness characteristic of the Ford Taurus, which gives the possibility of phenomenological and simple body crumple analytical description at a speed equal to 10 km/h, 40 km/h, 56 km/h and 60 km/h, which is an original part of the work. The approach enables us to describe the vehicle crash by focusing on variations of deformation in time, stiffness, vehicle collision time (duration), deceleration and dynamic crash force. Basing on the body stiffness data of the personal vehicle, the length of the deformation zone in the front of the car and the maximum values of force at the crash for a speed of 60 km/h are presented. Results obtained by the authors show that is possible to estimate the overloading level during the crash time of a vehicle based on the stiffness characteristic of the car body. The proposed methodology can be developed and the advantage of the presented procedure is an uncomplicated useful tool for solving complex problems of a vehicle crash.","PeriodicalId":44942,"journal":{"name":"Acta Mechanica et Automatica","volume":"17 1","pages":"68 - 75"},"PeriodicalIF":0.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48490038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Determination of Thermal Diffusivity Values Based on the Inverse Problem of Heat Conduction – Numerical Analysis 基于热传导反问题的热扩散系数值的确定-数值分析

IF 0.7

Acta Mechanica et Automatica Pub Date : 2022-12-01 DOI: 10.2478/ama-2022-0048

A. Adamowicz

引用次数: 0

Experiments and Analysis of the Limit Stresses of a Magnetorheological Fluid 磁流变液极限应力的实验与分析

IF 0.7

Acta Mechanica et Automatica Pub Date : 2022-12-01 DOI: 10.2478/ama-2022-0049

W. Horak, Barbara Stępień, B. Sapiński

引用次数: 1

Second Law Analysis of MHD Forced Convective Nanoliquid Flow Through a Two-Dimensional Channel 二维通道MHD强制对流纳米液体流动的第二定律分析

IF 0.7

Acta Mechanica et Automatica Pub Date : 2022-12-01 DOI: 10.2478/ama-2022-0050

Rached Miri, M. A. Abbassi, M. Ferhi, R. Djebali

{"title":"Second Law Analysis of MHD Forced Convective Nanoliquid Flow Through a Two-Dimensional Channel","authors":"Rached Miri, M. A. Abbassi, M. Ferhi, R. Djebali","doi":"10.2478/ama-2022-0050","DOIUrl":"https://doi.org/10.2478/ama-2022-0050","url":null,"abstract":"Abstract The present study deals with fluid flow, heat transfer and entropy generation in a two-dimensional channel filled with Cu–water nanoliquid and containing a hot block. The nanoliquid flow is driven along the channel by a constant velocity and a cold temperature at the inlet, and the partially heated horizontal walls. The aim of this work is to study the influence of the most important parameters such as nanoparticle volume fraction (0%≤ϕ≤4%), nanoparticle diameter (5 nm≤dp≤55 nm), Reynolds number (50≤Re≤200), Hartmann number (0≤Ha≤90), magnetic field inclination angle (0≤γ≤π) and Brownian motion on the hydrodynamic and thermal characteristics and entropy generation. We used the lattice Boltzmann method (LBM: SRT-BGK model) to solve the continuity, momentum and energy equations. The obtained results show that the maximum value of the average Nusselt number is found for case (3) when the hot block is placed between the two hot walls. The minimum value is calculated for case (2) when the hot block is placed between the two insulated walls. The increase in Reynolds and Hartmann numbers enhances the heat transfer and the total entropy generation. In addition, the nanoparticle diameter increase reduces the heat transfer and the irreversibility, the impact of the magnetic field inclination angle on the heat transfer and the total entropy generation is investigated, and the Brownian motion enhances the heat transfer and the total entropy generation.","PeriodicalId":44942,"journal":{"name":"Acta Mechanica et Automatica","volume":"16 1","pages":"417 - 431"},"PeriodicalIF":0.7,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45903018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Application of the Deformation Fracture Criterion to Cracking of Disc Specimens with a Central Narrow Slot 变形断裂准则在中心窄缝圆盘试样断裂中的应用

IF 0.7

Acta Mechanica et Automatica Pub Date : 2022-11-15 DOI: 10.2478/ama-2022-0047

A. Kazberuk

引用次数: 0

Numerical Criterion for the Duration of Non-Chaotic Transients in ODEs 常微分方程中非混沌瞬态持续时间的数值判据

IF 0.7

Acta Mechanica et Automatica Pub Date : 2022-11-15 DOI: 10.2478/ama-2022-0046

R. Szczebiot, R. Kaczyński, Leszek Gołdyn

引用次数: 0

Computational Investigation of Vibration Characteristics Analysis for Industrial Rotor 工业转子振动特性分析的计算研究

IF 0.7

Acta Mechanica et Automatica Pub Date : 2022-11-08 DOI: 10.2478/ama-2022-0044

Noureddine Aimeur, N. Menasri

{"title":"Computational Investigation of Vibration Characteristics Analysis for Industrial Rotor","authors":"Noureddine Aimeur, N. Menasri","doi":"10.2478/ama-2022-0044","DOIUrl":"https://doi.org/10.2478/ama-2022-0044","url":null,"abstract":"Abstract During the operation of a rotor, various types of vibrations appear in this mechanical system and often limit the performance and endanger the safety of the operation. Therefore, dynamic analysis is essential because precise knowledge of the vibration behaviour is essential to ensure proper operation. This article presents a set of scientific techniques for the modelling and simulation of rotor vibrations. To work out the equations of the vibratory movement of the rotor, we used the energy approach of Lagrange. To achieve this, a model with one blading wheel carried by a shaft supported by two hydrodynamic bearings is chosen basedon the characteristics of the rotor studied (Fan 280 cement draft fan). It is an arduous task to manually ascertain the analytical resolution of the differential equations that characterise the vibratory behaviour of the rotor. The numerical approach employing the finite element method, programmed on the ANSYS software, made it possible to perform the vibration analysis of the rotor. First, the FAN 280 cement draft fan rotor is modelled using SolidWorks 3D software and reverse design using the coordinate measuring machine (CMM) for the design of the fins. Then, the modal characteristics of the fan rotor model were analysed using the finite element analysis (FEA) software ANSYS Workbench. Also, to study the effect of blade wear on critical speeds, the Campbell diagram was obtained. Finally, harmonic analysis was performed to determine the amplitude of the rotor vortex at critical speeds obtained with and without blade wear.","PeriodicalId":44942,"journal":{"name":"Acta Mechanica et Automatica","volume":"16 1","pages":"373 - 381"},"PeriodicalIF":0.7,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43382663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0