Systematic design of a new gearbox for concrete mixers

2020 ◽  
Vol 18 (6) ◽  
pp. 2017-2042 ◽  
Author(s):  
Lorenzo Fiorineschi ◽  
Susanna Papini ◽  
Luca Pugi ◽  
Andrea Rindi ◽  
Federico Rotini
Keyword(s):  
Power Transmission ◽  
Mechanical Design ◽  
Direct Consequence ◽  
Design Approach ◽  
Systematic Design ◽  
Original Design ◽  
Element Analysis ◽  
Content Type ◽  
Planetary Gearbox ◽  
Embodiment Design

Purpose The purpose of this study is to identify an innovative solution for the power transmission gearbox of concrete mixers, according to the specifications provided by the company. Design/methodology/approach A tailored systematic design approach (inspired to the German systematic framework) has been adopted to comprehensively gather the company specifications and perform in-depth design space explorations. Subsequently, an iterative embodiment design approach has been followed to identify the size of the components for the preferred concept, by using acknowledged mechanical design procedures and finite element analysis tools. Findings An innovative cycloidal gearbox has been developed, by merging the kinematics underpinning the classical cycloidal drives and the Wolfrom planetary gearbox. The resulting concept provides high reduction rates with a very high overload capacity. Research limitations/implications The main limitation of the studies is the absence of in-depth evaluations usually performed in the detail design phase. However, this limitation is a direct consequence of the company specifications, which only asked to find a preferred concept and to perform preliminary evaluations. Accordingly, the subsequent design optimization are intended to be performed by the company’s staff. Originality/value The present paper shows an original design approach, opportunely tailored to the design of innovative gearboxes. It can be conveniently adapted and reused by designers involved in similar tasks. Moreover, the designed cycloidal gearbox paves the way for important innovations in the field of concrete mixers, allowing to design more robust and compact devices.

scholarly journals Task based conceptual design of a testing machine

2019 ◽  
Vol 287 ◽  
pp. 01008
Author(s):  
Hrayr Darbinyan
Keyword(s):  
Conceptual Design ◽  
Power Transmission ◽  
Mechanical Design ◽  
Design Method ◽  
Testing Machine ◽  
General Concept ◽  
Test Machine ◽  
Concept Design ◽  
Original Design ◽  
Design Cycle

A novel approach of task based conceptual design(TBCD) has been successfully used as direct guider and efficient developer of unique mechanical structures for many cases of mechanical design. Nearly a decade long efforts of elaboration of efficient every day usage formats for this method have been ended in convenient design pages suitable and applicable for revealing, describing, visualizing and managing the data necessary for organizing the design process from task definition to solutions satisfying original design tasks. The aim of current study is to show steps of a solution generation within frames of a single design cycle and extend this action over consecutive design cycles. Those steps are described from standpoint of general concept design method starting from key model and finished with final aggregation matrice as ultimate step of a single design cycle. Unified mathematical expressions are used for introduction and description of all worked out and developed components of conceptual design. The paper is arranged in a way to show gradual steps of conceptual design(CD) of a power transmission system – a pipe wrench life test machine.

Toward a Systematic Design Process for Apparel

2015 ◽  
Author(s):  
Yu Zhao ◽  
Dong He ◽  
Y. Lin ◽  
W. J. Zhang
Keyword(s):  
Design Process ◽  
General Term ◽  
Design Approach ◽  
Systematic Design ◽  
Apparel Design ◽  
Detail Design ◽  
Embodiment Design ◽  
Task Classification ◽  
Product Design Process ◽  
Apparel Product

This paper first provides a critical review of the literature regarding the contemporary apparel (product) design process, and then proposes a new apparel design process. Apparel is a general term for products which covers dress, skirt, etc. The new apparel design process applies a so-called systematic design approach well known to field of design. The systematic design approach classifies a design into four phases, namely, task classification, conceptual design, embodiment design, and detail design. The four phases are then tailored to apparel design. The new apparel design process is thus more rational and systematic. The paper uses a gown (a type of apparel) design as a case to illustrate the benefit of this new apparel design process, i.e., improved potentials to make apparel design more creative and efficient.

scholarly journals Design and Analysis of a Novel Speed-Changing Wheel Hub with an Integrated Electric Motor for Electric Bicycles

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Yi-Chang Wu ◽  
Zi-Heng Sun
Keyword(s):  
High Speed ◽  
Power Transmission ◽  
Permanent Magnet Synchronous Motor ◽  
Planetary Gear ◽  
Rear Wheel ◽  
Gear Train ◽  
Direct Drive ◽  
Element Analysis ◽  
Embodiment Design ◽  
Electric Bicycles

The aim of this paper is to present an innovative electromechanical device which integrates a brushless DC (BLDC) hub motor with a speed-changing wheel hub stored on the rear wheel of an electric bicycle. It combines a power source and a speed-changing mechanism to simultaneously provide functions of power generation and transmission for electric bicycles. As part of the proposed integrated device, the wheel hub consists of a basic planetary gear train providing three forward speeds including a low-speed gear, a direct drive, and a high-speed gear. Each gear is manually controlled by the shift control sleeve to selectively engage or disengage four pawl-and-ratchet clutches based on its clutching sequence table. The number of gear teeth of each gear element of the wheel hub is synthesized. The BLDC hub motor is an exterior-rotor-type permanent-magnet synchronous motor. Two-dimensional finite-element analysis (FEA) software is employed to facilitate the motor design and performance analysis. An analysis of the power transmission path at each gear is provided to verify the validity of the proposed design. The results of this work are beneficial to the embodiment, design, and development of novel electromechanical devices for the power and transmission systems of electric bicycles.

Finite Element Analysis of a Compressor Housing Used in High Pressure Refrigeration System

2007 ◽  
Author(s):  
Raul Bosco ◽  
Ricardo Alexandre Maciel ◽  
Miguel Mattar Neto ◽  
Carlos Alexandre J. Miranda
Keyword(s):  
High Pressure ◽  
Structural Integrity ◽  
High Pressures ◽  
Cost Effective ◽  
Design Approach ◽  
Refrigeration System ◽  
Original Design ◽  
Element Analysis ◽  
Compression Mechanism ◽  
Development Approach

In the design of compressors running with high pressure refrigerants, safety aspects must be a mandatory concern. Moreover, when dealing with high pressure levels, compressor components have their original design adapted to withstand such a high pressures, particularly acoustical mufflers, external housing, and compression mechanism. Regarding the external housing, the design approach goes beyond acoustical and aesthetics features as mostly observed in current refrigerating compressors. In order to safety enclose the compression mechanism the application of a proper design methodology is mandatory to safeguard the structural integrity of both the compressor external housing and the whole refrigerating system. Looking for acceptable, cost effective safety factors, a simultaneous design approach including advanced structural mechanics techniques, experimentation, safety Codes revision, and Computer Aided Engineering (CAE) tools application is mandatory. The aim of this work is to present a new development approach, concerning structural design of a compressor housing used in high pressure refrigeration system. Numerical and experimental results will be compared among each other aiming to evaluate some ASME Codes criteria and design procedures.

Design technique for leakage current reduction in surge arrester using gravitational search algorithm and imperialist competitive algorithm

2018 ◽  
Vol 37 (1) ◽  
pp. 357-374 ◽  
Author(s):  
Nurul Ain Abdul Latiff ◽  
Hazlee Azil Illias ◽  
Ab Halim Abu Bakar ◽  
Syahirah Abd Halim ◽  
Sameh Ziad Dabbak
Keyword(s):  
Leakage Current ◽  
Search Algorithm ◽  
Gravitational Search Algorithm ◽  
Imperialist Competitive Algorithm ◽  
Original Design ◽  
Element Analysis ◽  
Content Type ◽  
Competitive Algorithm ◽  
Surge Arresters ◽  
Gravitational Search

Purpose Leakage current is one of the factors, which can contribute towards degradation of surge arresters. Thus, the purpose of this paper is to study on leakage current within surge arresters and improvement on their design. Design/methodology/approach In this work, a three-dimensional model geometry of 11 kV zinc oxide surge arrester was designed in finite element analysis and was applied to calculate the leakage current under normal operating condition and being verified with measurement results. The optimisation methods were used to improve the arrester design by minimising the leakage current across the arrester using imperialist competitive algorithm (ICA) and gravitational search algorithm (GSA). Findings The arrester design in reducing leakage current was successfully optimised by varying the glass permittivity, silicone rubber permittivity and the width of the ground terminal of the surge arrester. It was found that the surge arrester design obtained using ICA has lower leakage current than GSA and the original design of the surge arrester. Practical implications The comparison between measurement and simulation enables factors that affect the mechanism of leakage current in surge arresters to be identified and provides the ideal design of arrester. Originality/value Surge arrester design was optimised by ICA and GSA, which has never been applied in past works in designing surge arrester with minimum leakage current.

Non-reactive test rig for combustor-turbine interaction studies in industrial gas turbines

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Lorenzo Fiorineschi ◽  
Tommaso Bacci ◽  
Francesco Saverio Saverio Frillici ◽  
Simone Cubeda ◽  
Yary Volpe ◽  
...  
Keyword(s):  
Information Exchange ◽  
Gas Turbines ◽  
Fluid Dynamic ◽  
Design Approach ◽  
Design Activity ◽  
Specific Class ◽  
Test Rig ◽  
Content Type ◽  
Embodiment Design ◽  
Interaction Studies

Purpose This paper aims to present the design of a particular non-reactive test rig for combustion swirlers and first stage turbine nozzles. The test rig is required for important experimental activities aimed at the optimization of a specific class of gas turbines. Design/methodology/approach A multi-disciplinary team performed the design process by following a tailored design approach, which has been developed for the specific case. The design outcomes allowed to build a fully functional test rig to be introduced in a test cell and then to perform preliminary experiments about the fluid dynamic behaviour of the turbine elements. Findings The followed design approach allowed to efficiently perform the task, by supporting the information exchange among the different subjects involved in both the conceptual and the embodiment design of the test rig. Additionally, the performed experiments allowed to achieve a final configuration that makes the test rig a valuable test case for combustor-turbine interaction studies. Research limitations/implications The study described in this paper is focused on the design of a specific test rig, used for first validation tests. However, the achieved results (both in terms of design and test) constitutes the underpinning of the in-depth investigations to be performed in the next steps of the experimental campaign. Originality/value To the best of the authors’ knowledge, the present paper is the first one that comprehensively describes the design activity of an experimental test rig for turbine application, also providing indications about the specific methodological procedure used to manage the process.

scholarly journals Numerical study of influential factors on partial discharges in HVDC XLPE cables

2018 ◽  
Vol 37 (3) ◽  
pp. 1110-1117 ◽  
Author(s):  
Miao He ◽  
Miao Hao ◽  
George Chen ◽  
Wenpeng Li ◽  
Chong Zhang ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Repetition Rate ◽  
Power Transmission ◽  
Numerical Study ◽  
Influence Factors ◽  
Influential Factors ◽  
External Factors ◽  
Element Analysis ◽  
Power Sources ◽  
Content Type

Purpose For the dramatically developed high voltage direct current (HVDC) power transmission, HVDC cables play a vital role in the power transmission across seas and connections with renewable power sources. However, the condition monitoring of HVDC cables is still a challenging research topic. This paper aims to understand the influence of external factors, namely, current, cavity location and material properties, on partial discharge (PD) characteristics in HVDC cable in a numerical way referring to the refined Niemeyer’s model. Design/methodology/approach The influences of the three external factors are studied by a proposed numerical model for DC PDs based on the modification of a conventional PD model for AC voltage via a finite element analysis method. Findings The external factors can influence the discharge magnitude and discharge repetition rate via affecting the electrical conductivity of the material: DC PD is more frequent and with higher discharge magnitude when the cavity is closer to the conductor or the current through the conductor is higher. Both DC PD repetition rate and average discharge magnitude in long-term aged material are lower than virgin material. The effect of discharge on insulation degradation becomes decreasingly significant. Research limitations/implications The current work is based on the numerical modelling of DC PDs. Further experimental validations and comparisons are essential for improving the model. Practical implications The studies of the influence factors for PDs under HVDC voltage can benefit the research and practical power transmission on DC PDs, contributing the design and test of DC PDs in HVDC cables, exploring the understandings of the DC PDs’ mechanism. Originality/value This paper, to the best of author’s knowledge, first studies the influence factors on DC PDs based on the numerical modelling work.

Novel hybrid excited machine with flux barriers in rotor structure

2018 ◽  
Vol 37 (4) ◽  
pp. 1489-1499 ◽  
Author(s):  
Marcin Wardach ◽  
Ryszard Palka ◽  
Piotr Paplicki ◽  
Michal Bonislawski
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Control Method ◽  
Permanent Magnet Machines ◽  
Original Design ◽  
Element Analysis ◽  
Flux Control ◽  
Content Type ◽  
Field Weakening ◽  
Rotor Structure

Purpose Permanent magnet (PM) electrical machines are becoming one of the most popular type of the machines used in electrical vehicle drive applications. The main drawback of permanent magnet machines, despite obvious advantages, is associated with the flux control capability, which is limited at high rotor speeds of the machine. This paper aims to present a new arrangement of permanent magnets and flux barriers in the rotor structure to improve the field weakening control of hybrid excited machines. The field weakening characteristics, back-emf waveforms and efficiency maps of this novel machine have been reported. Design/methodology/approach In the study, finite element analysis was used to perform simulation research. Then, based on the simulation studies, an experimental model was built. The paper also presents selected experimental results. Findings Obtained results show that the proposed machine topology and novel control strategy can offer an effective flux control method allowing to extend the maximal rotational speed of the machine at constant power range. Practical implications The proposed solution can be used in electric vehicles drive to extend its torque and speed range. Originality/value The paper presents original design and results of research on a new solution of a hybrid excited machine with magnetic barriers in a rotor.

scholarly journals A preliminary mechanical design evaluation of the Wikispeed car: for light-weighting implications

2019 ◽  
Vol 17 (1) ◽  
pp. 230-249
Author(s):  
Siddharth Kulkarni ◽  
David John Edwards ◽  
Craig Chapman ◽  
M. Reza Hosseini ◽  
De-Graft Owusu-Manu
Keyword(s):  
Mechanical Design ◽  
Design Evaluation ◽  
Two Phase ◽  
Element Analysis ◽  
Content Type ◽  
3D Cad ◽  
Global Challenge ◽  
Beam Design ◽  
Light Weighting ◽  
And Performance

Purpose Road passenger transportation faces a global challenge of reducing environmental pollution and greenhouse gas emissions because of the vehicle weight increases needed to enhance passenger safety and comfort. This paper aims to present a preliminary mechanical design evaluation of the Wikispeed Car (with a focus on body bending, body torsion and body crash) to assess light-weighting implications and improve the vehicle’s environmental performance without compromising safety. Design/methodology/approach For this research, finite element analysis (FEA) was performed to examine the Wikispeed chassis for light-weighting opportunities in three key aspects of the vehicle’s design, namely, for body bending the rockers (or longitudinal tubes), for body torsion (again on the rockers but also the chassis as a whole) and for crash safety – on the frontal crash structure. A two-phase approach was adopted, namely, in phase one, a 3D CAD geometry was generated and in phase, two FEA was generated. The combination of analysis results was used to develop the virtual model using FEA tools, and the model was updated based on the correlation process. Findings The research revealed that changing the specified material Aluminium Alloy 6061-T651 to Magnesium EN-MB10020 allows vehicle mass to be reduced by an estimated 110 kg, thus producing a concomitant 10 per cent improvement in fuel economy. The initial results imply that the current beam design made from magnesium would perform worst during a crash as the force required to buckle the beam is the lowest (between 95.2 kN and 134 kN). Steel has the largest bandwidth of force required for buckling and also requires the largest force for buckling (between 317 kN and 540 kN). Originality/value This is the first study of its kind to compare and contrast between material substitution and its impact upon Wikispeed car safety and performance.

Torque and back-emf in hybrid excited claw pole generator

2018 ◽  
Vol 37 (4) ◽  
pp. 1342-1353 ◽  
Author(s):  
Marcin Wardach
Keyword(s):  
Permanent Magnets ◽  
Experimental Results ◽  
Original Design ◽  
Element Analysis ◽  
Simulation Research ◽  
Cogging Torque ◽  
Content Type ◽  
Excitation Coil ◽  
New Construction ◽  
Torque Values

Purpose The paper aims to present the hybrid excited claw pole generator design, simulation and experimental results. The prototype has claw poles on two rotor sections, between which an excitation coil is located. The innovation of this machine is permanent magnets location on claws of one part of the rotor. The paper presents construction of the machine and analysis of the current in the excitation control coil influence on the electromagnetic torque, cogging torque and back-emf values. Presented studies enabled the determination of the torque and the back-emf for both: the strengthening and the weakening of magnetic field. Design/methodology/approach In the study, finite element analysis was used to perform simulation research. Then, based on the simulation studies, an experimental model was built. The paper also presents selected experimental results. Findings Achieved results show that the proposed machine topology allows to eliminate the disadvantages mentioned in paper, i.e. necessary to introduce special areas inside the machine to limit magnetic flux leakage or its complicated construction. Research limitations/implications The obtained cogging torque values and back-emf pulsation are still relatively high. In the near future, some of known techniques for reducing these pulsations can be applied, including the use of magnetic wedges, changing shapes of rotor’s poles and/or skewing of permanent magnets. Practical implications The proposed solution can be used in wind turbines as a generator. Originality/value The paper presents an original design of a new construction of a hybrid-excited claw pole machine and also an excitation current influence on cogging torque and back-emf values.

Sign in / Sign up

Export Citation Format

Share Document