<abstract><title style='display:none'>Abstract</title>Classical analysis methods are applied to show how flexural deflections due to shear strain in the flange pack produce bending moments and tensile loads on bolts within preloaded bolted joints. It was found that in joints made with long bolts these loads can be significant. The loads can cause yielding of the bolt, reducing bolt preload. The methods presented are adequate to demonstrate the structural integrity of joints made with long bolts or with a small footprint.</abstract>

Analysis of Bolt Bending in Preloaded Bolted Joints

<abstract><title style='display:none'>Abstract</title> The use of chlorofluorocarbon based refrigerants in the air-conditioning system increases the global warming and causes the climate change. The climate change is expected to present a number of challenges for the built environment and an evaporative cooling system is one of the simplest and environmentally friendly cooling system. The evaporative cooling system is most widely used in summer and in rural and urban areas of India for human comfort. In evaporative cooling system, the addition of water into air reduces the temperature of the air as the energy needed to evaporate the water is taken from the air. Computational fluid dynamics is a numerical analysis and was used to analyse the evaporative cooling system. The CFD results are matches with the experimental results.</abstract>

NagarjunaCollege of Engineering and Technology, Bengaluru - 562 164,

Nitte Meenakshi Institute of Technology, Bengaluru - 560 064,

Computational Fluid Dynamics Analysis of an Evaporative Cooling System

<abstract>
<title style='display:none'>Abstract</title>
The ranking results of the alternatives are heavily influenced by the decision making method, data normalization method, and calculation method for criterion weights. In this study, five multi-criteria decision-making methods were compared: <italic>MABA</italic>C, <italic>COCOS</italic>O, <italic>MAIRCA</italic>, <italic>VIKOR</italic>, and <italic>ROV</italic>. All of these methods use the same data normarmalization method. The weights for the criteria were determined using four methods: Equal, ROC, RS, and Entropy. In two different examples, the combination of multi-criteria decision-making methods with weighting methods for ranking alternatives is demonstrated. In each example, the number of options and the number of criteria are also different. The results in both examples show that regardless of the weighting method, multi-criteria decision-making methods always determine the same best solution. Furthermore, the direction of future research has been mentioned in the final section of this paper.
</abstract>

Comparison of Multi-Criteria Decision Making Methods Using The Same Data Standardization Method

<abstract>
<title style='display:none'>Abstract</title>
The object of the work is numerical analysis of the state of stress in the plate with holes made along its diagonal, which was subjected to a plane load. The plate was subjected to biaxial loading both in the direction of the y axis, i.e. Py = +/-100 kN and the z axis, i.e. Pz = +/-100 kN. It was shown that the highest concentration of reduced stress occurred in a plate with two holes in the case of load in the form of pure shear (Py = -100 kN, Pz = 100 kN). The pure shear load case proved to be the least favourable from the point of view of straining the plate with holes.
</abstract>

Stress Distribution in a Plate with a Holes Along the Diagonal Distribution Under Plane Biaxial Load

<abstract><title style='display:none'>Abstract</title>In Turbo machines, there are many components which are provided with interference to transmit torque and to maintain contact between them. There are transient scenarios where impeller and shaft lose interference and limits the speed of the impeller. In this paper, a case study on centrifugal compressor has been presented to see the effect of taper pairing of shaft with impeller. When the centrifugal compressor starts then a transient condition is dominant wherein the impeller of the centrifugal compressor gains higher temperature quickly compared to shaft. Since the thermal expansion of the impeller will be much more than the shaft, interference between impeller and shaft is likely to reduce. With reduced interference, the impeller should retain minimum required contact pressure with the shaft and the torque transmitting capability. For conventional fitted impeller, stress built up is a major concern especially at higher speeds. This paper gives a proposal about the importance of tapered interference fit method compared to cylindrical fitted impeller assembly. An effective analysis between the conventional straight fitted impeller and impeller having tapered bore is presented for the same torque transfer capability. The analysis reveals that for the impeller with tapered bore, the stress for impeller reduces and a healthy contact pressure exists.</abstract>

Effect of Tapered Interference Fit between Impeller and Shaft in Turbo Machines

<abstract><title style='display:none'>Abstract</title>The purpose of this paper is to present a paradigm, or guide, to the analysis of preloaded bolted joints made using multiple bolts. Classical analysis methods are applied to the interaction of the joint elements subjected to combinations of both in-plane and out-of-plane loads and moments. The distribution of the external loads and moments within the preloaded joint is determined in relationship to individual bolts. An analysis of loads and stresses in individual bolts and dowels along with flange bending and thread shear in tapped or threaded holes is developed. The article brings together a number of concepts and links them into a practical design analysis process that is applicable for many cases of preloaded bolted joints and are adequate to demonstrate the structural integrity of each element of the joint. Interpretation of results, within the context of design standards, is provided. In some cases finite element methods may be more appropriate, and the methods discussed can be used in the validation process.</abstract>

A Paradigm for the Analysis of Preloaded Bolted Joints

<abstract>
<title style='display:none'>Abstract</title>
Several algorithms such as A*, Dijkstra, SLAM (Simultaneous Localisation and Mapping) and APF (Artificial Potential Field) were used in this study to create local maps, plan the shortest path, and localize mobile robots. In fact, when compared to the SLAM/APF method, these algorithms achieved a reduction in road length by 1.18 meters. Nevertheless, the SLAM/APF method outperformed the Dijkstra algorithm by reducing navigation time by 7.62 seconds and surpassed the A* method by reducing navigation time by 5.76 seconds.
</abstract>

Increasing the Efficiency of Mobile Robot Navigation Using Slam with Several Advanced Algorithms and Filters

<abstract>
<title style='display:none'>Abstract</title>
This study explores the quest for a more cost-effective and practical method of measuring forces in motorcycle suspension systems by utilizing simple potentiometers as an alternative to sophisticated strain gauges. The research delves into the feasibility of potentiometers to provide accurate and reliable force measurements, offering potential advantages in terms of affordability, accessibility, and ease of implementation. Through empirical testing and verification, this investigation aims to establish potentiometers as a viable and economical solution for enhancing motorcycle suspension performance monitoring and tuning.
</abstract>

Methodology for Measuring Forces in Motorcycle Suspension Using a System Based on Analogue Potentiometers

<abstract>
<title style='display:none'>Abstract</title>
For the purpose of efficient algae cultivation, the Photo Bio-Reactor (PBR) must be designed according to the needs of the algae to be cultivated. We performed our experiment with a loop reactor with a total volume of 14 liters. Among other things, the mixing of the gas and liquid phases, the value and change of the light intensity reaching the algae, and the degree of algae deposition on the walls of the equipment depend on the flow caused by the bubble column in the equipment. Using the ANSYS FLUENT simulation environment, we optimized the efficiency of the gas intake that determines the flow.
</abstract>

Flow Simulation in an Alga Photobioreactor Tested Under Laboratory Conditions

<abstract>
<title style='display:none'>Abstract</title>
This article presents a model of rigid rotor supported by active magnetic bearings (AMB). Mathematical formulation of magnetic forces generated by AMB has been developed. Equations of motion of rigid rotor supported by controllable AMB with and without control law are presented. Eigen structure assignment method is used to change the eigenfrequency of mechatronical system. Numerical simulations are compared with experimental measured data. The simulations presented in this paper correspond with measurement.
</abstract>

Control of Active Magnetic Bearings

<abstract>
<title style='display:none'>Abstract</title>
The article deals with determining the operating state of machinery and its components by processing trend characteristics through measuring mechanical vibration, which determine the end of the lifetime cycle of machine components. It focuses mainly on the area of spinning headstocks and proposes a methodology for permanent monitoring of the dynamic behaviour of the bearings of spinning units. The elaborate the methodology for monitoring bearings leads to an increase in the service lifetime of machinery components. It analyses the causes and frequency and time distribution of vibration.
</abstract>

Monitoring of Machinery Components During Their Life Cycle

<abstract>
<title style='display:none'>Abstract</title>
This study aims to improve the technology for processing parts from hard-to-work materials, to study and substantiate the parameters of the plasma-assisted machining processing of surfaces of alloy steel parts to increase processing productivity and ensure the necessary quality of surface layers. Theoretical studies consist in determining the parameters of the thermal field of a workpiece during milling and turning with plasma heating. Experimental studies are based on a study of the interrelationship of the main indicators of machining with factors of preliminary plasma heating allowance.
</abstract>

Evaluation of the Quality Parameters of the Surface Layer of Parts After Machining with Plasma Heating

<abstract><title style='display:none'>Abstract</title> Now days, green composite materials are now gaining popularity for the various industrial applications. It is a combination of naturally occurring reinforcement like jute, sisal, flax, hemp, and kenaf; and matrix materials like biopolymers or bio resins which have been derived from starch, and vegetable oils. It is becoming more desirable due to its properties like biodegradability, renewability and environment friendly. The present paper presents the various natural fibers and their combinations with biopolymers. The paper also reflects the key issue related to hydrophilic nature of natural fibers and their remedies for a good fiber and bio polymer adhesion. Furthermore the strategy used and major attributes of the green composite are also discussed.</abstract>

Natural Fibers and Biopolymers Characterization: A Future Potential Composite Material

<abstract>
<title style='display:none'>Abstract</title>
Low surface roughness and high Material Removal Rate (<italic>MRR)</italic> are expected in most machining methods in general and milling method in particular. However, they sometimes do not occur, for example, the <italic>MRR</italic> is often small as the surface roughness is low. In this case, the decisions made should ensure that desires are simultaneously satisfied. This situation leads to a problem known as multi-criteria decision making (<italic>MCDM</italic>). In this study, five methods including <italic>EDAS</italic>, <italic>MARCOS</italic>, <italic>PIV</italic>, <italic>MOORA</italic> and <italic>TOPSIS</italic> are used together for the decision-making in the milling process. The purpose of the research is to determine the value of cutting parameters for both the low surface roughness and large <italic>MRR</italic>. The comparison of these methods for finding the best is carefully discussed as well.
</abstract>

Application of EDAS, MARCOS, TOPSIS, MOORA and PIV Methods for Multi-Criteria Decision Making in Milling Process

<abstract><title style='display:none'>Abstract</title>A ‘Sluice’ is a water-flow control gate works with sliding. So, it’s a mill race, flume or a penstock, channelling water towards a water mill, traditionally a wood or metal barrier sliding in grooves that are set in the sides of the waterway. They are used in wastewater treatment of plants, and control water level and flow in watermills. However, Sluices are subjected to temperature, environment that supports corrosion, impact loading and so on. Many of those equipments operate during long time in industries and reliability is one of the most important aspects of work, there arose questions of reliability on those structural elements, because the people working nearby will be in danger due to involvement of heavy loaded parts during various possible working states. Considering these factors the gates used in industries are subjected for “Fatigue Analysis”, but the normal V-channel gates which undergo corrosion, wear and continuous stress due to water flow which leads to fatigue failure, loss of material and wastage of water are still in need of this analysis. Hence there is need of an analysis to optimize the gate in terms of material, shape, and size. This paper helps to determine the fatigue strength, wear life of Sluice gate in “V-Channels”. So, by using the ANSYS Workbench software, sluice gate is analysed for fatigue life under fluid flow.</abstract>

Optimization of Sluice Gate under Fatigue Life Subjected for Forced Vibration by Fluid Flow

<abstract><title style='display:none'>Abstract</title>Friction Stir Welding (FSW) is one of the most effective solid state joining processes and it has numerous potential applications in many industries. The simulation process can provide the evolution of physical quantities such as temperature, metallurgical phase proportions, stress and strain which can be easily measured during welding. The numerical modelling requires the modelling of a complex interaction between thermal, metallurgical and mechanical phenomena. The aim of this paper is to describe the thermal-fluid simulation of FSW using the finite element method. In the theoretical part of the paper heating is provided by the material flow and contact condition between the tool and the welded material. The thermal-fluid results from the numerical simulation for aluminium alloy using SYSWELD are also presented in this paper.</abstract>

FSW Numerical Simulation of Aluminium Plates by Sysweld - Part I

<abstract><title style='display:none'>Abstract</title> Friction stir processing (FSP) is solid state novel technique developed to refine microstructure and to improve the mechanical properties and be used to fabricate the aluminium alloy matrix composites. An attempt is made to fabricate AA6061/TiB2 aluminium alloy composite (AMCs) and the influence of process parameters like rotational speed, transverse feed, axial load and percentage reinforcement on microstructure and mechanical properties were studied. The microstructural observations are carried out and revealed that the reinforcement particles (TiB2) were uniformly dispersed in the nugget zone. The Tensile strength and Hardness of composites were evaluated. It was observed that tensile strength, and hardness were increased with increased the rotational speed and percentage reinforcement of particles. The process parameters were optimized using Taguchi analysis (Single Variable) and Grey analysis (Multi Variable). The most influential parameter was rotational speed in single variable method and multi variable optimization method. The ANOVA also done to know the percentage contribution of each parameter.</abstract>

BVC Engineering college, Faculty of Mechanical Engineering, Odalarevu -533210, Andhra Pradesh,

Andhra university college of Engineering (A), Faculty of Mechanical Engineering, Andhra University, Visakhapatnam- 530003, Andhra Pradesh,

Process Parameters Optimization for Producing AA6061/TiB2 Composites by Friction Stir Processing

<abstract><title style='display:none'>Abstract</title>The advanced development of additive technologies over the past years led to the fact that parts made by these technologies have been increasingly used in the most diverse engineering applications. One of the most famous and the most applied additive technology is 3D printing. In this paper the influence of the material type on the operational characteristics of spur gears manufactured by the 3D printing technology is analyzed, after the experimental testing performed on a back to back gear test rig, in the predefined laboratory conditions.</abstract>

The Influence of Material on the Operational Characteristics of Spur Gears Manufactured by the 3D Printing Technology

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Strojnícky časopis - Journal of Mechanical Engineering

eISSN: 2336-3037pISSN: 0039-2472 The Strojnícky časopis – Journal of Mechanical Engineering publishesoriginal scientific and application oriented papers, dealing...

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eISSN: 2336-3037pISSN: 0039-2472 The Strojnícky časopis – Journal of Mechanical Engineering publishesoriginal scientific and...

Strojnícky časopis - Journal of Mechanical Engineering

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