11 Articles Published

1. LOAD CARRYING CAPACITY OF A HOT ROLLED WING

Authors: PATRICK KAEDING , THOMAS LINDEMANN

Abstract: Wind turbine blades are mostly made of fibre reinforced plastics. However, in particular for the part connected to the hub steel may be used for large turbines in the future. A 3-dimensional rolling process was developed for such wing profiles, which are rolled to shape and thickness in one step. This paper deals with a practical way to access the load carrying capacity of hot rolled steel parts and to give a simple material model for design purpose. Based on systematic finite element analyses, which are compared to a 3-point bending experiment, the parameters for a bilinear material model are derived. The material model shall be suitable to reproduce the overall behaviour of the steel component so that accurate analyses are possible for structural design.

Keywords: steel, hot rolled, 3-point bending, experiment, finite element analysis (FEA), bilinear material model

Pages: 1 - 5 | DOI: 10.15224/978-1-63248-066-8-53

2. STUDY OF THE MECHANICAL BEHAVIOR OF LM20 ALLOY AT VARIOUS TEMPERATURES PROCESSED BY DIE-CASTING

Authors: MASHAMBA ABLE

Abstract: Now a day’s in the current domain, manufacturing industries are competing to reduce the cost and fuel consumption rates. Especially, in automobile and aerospace applications because of the improvement of lightweight metal advantages. Magnesium, aluminum and other few materials are considered as lightweight materials to use in required applications due to their inherent properties. Therefore, in this paper tried to characterize the advances of LM20 aluminum alloy rods by using the die-casting processes at various processing temperatures followed by room temperature, 373 K, and 473 K. The main aim is to study the effect of various processing temperature on microstructures and mechanical properties of LM20 alloy. Also, this paper reveals the stability of the microstructures of LM20 aluminum alloy though the processing temperature has been increased. The tensile strength, hardness of the LM20 aluminum alloy was decreased with increase in processing temperature. Similarly, the wear, and sur

Keywords: LM20, Die-casting, Microstructures, Mechanical Properties, and Surface roughnes

Pages: 11 - 15 | DOI: 10.15224/978-1-63248-066-8-55

3. NUMERICAL INVESTIGATION OF HEAT TRANSFER OF NANOFLUID FLOW PAST TWO CYLINDER IN TANDEM ARRANGEMENTS

Authors: OZGE YETIK

Abstract: In this paper, numerical method is developed and simulations of flow and heat transfer of nanofluids is presented. The effect of nanoparticle volume fraction for the enhancement of heat transfer is examined for several sets of values of Reynolds numbers. The study is conducted for pure water and watercopper nanofliud. The study is carried out for Reynolds numbers of 100 and 150 and for volume fraction of nanoparticles of 0, 0.05, 0.10 and 0.15. The mean Nusselt numbers for front and rear cylinders are obtained. The obtained results indicated that the increase of nanoparticles volume fraction has a positive effect on the mean Nusselt number.

Keywords: Nanofluid, Tandem arrangement, Flow past cylinder, Fluent.

Pages: 16 - 20 | DOI: 10.15224/978-1-63248-066-8-56

4. DEVELOPMENT OF A ROBOTICS WAITER SYSTEM FOR THE FOOD AND BEVERAGE INDUSTRY

Authors: A CHEONG , E FOO , HY GAN , MWS LAU

Abstract: With significant improvement in technologies, robotics systems have appeared in homes as vacuum robots, and as transporters of goods and equipment in the industries, including hospitals and mortuaries. In Singapore (amongst others), they have attracted the attention of the food and beverage (F&B) industry, in part due to the lack of human resources here. To address the latter, a work has been established to develop the concept of robotics waiter system to serve at dining tables. It is the integration of autonomous omnidirectional platforms, a commercial indoor Radio Frequency (RF) network of sensors and transmitters and off the shelf coaster paging system commonly used in Singapore eateries. The robotics waiter system will provide services that are mundane and repetitive. The mobile platforms are designed primarily to be productive and efficient; in the current design, the torso can convey many serving trays and possibly used for cutlery collection. However unlike humanoids, they are n

Keywords: Development , Robotics, Waiter System, beverage industry

Pages: 21 - 25 | DOI: 10.15224/978-1-63248-066-8-57

5. TASK SCHEDULING FOR A MULTI-ROBOT SYSTEM USING GENETIC ALGORITHM

Authors: JAHNG HYON PARK , JINHAN JEONG

Abstract: In this paper, we present and solve a scheduling problem for a high-density robotic workcell under various working conditions. The genetic algorithm (GA) is employed to optimize tasks for scheduling of the multi-robot system. A new operation method for generating subsequent generations of GA, controlled mutation is introduced depending on the value of the objective function in order to help the algorithm get out of the local minimum. Several simulation graphs verify efficiency of the proposed algorithm

Keywords: Multi-objective genetic algorithm, High-density robot, Scheduling, MTSP

Pages: 26 - 27 | DOI: 10.15224/978-1-63248-066-8-58

6. AN EXPERIMENTAL STUDY ON THE SHIFTING DYNAMICS OF THE CHAIN CVT

Authors: AHMET YILDIZ , FRANCESCO BOTTIGLIONE , GIUSEPPE CARBONE

Abstract: This paper is concerned with an experimental analysis of the shifting dynamic behavior of a chain continuously variable transmission (CVT) system. Firstly, the steady-state experiments are carried out for different speed ratio. After that, the transient responses of the CVT, the main interest of this paper, are analyzed in different conditions. The tests are performed for different step changes of the ratio of the drive and driven clamping forces and for different angular velocities of drive side. The results demonstrate that the speed ratio reaches high value for high steps; however this relation is nonlinear. Moreover, it is realized that the characteristic shifting response time of speed ratio decreases as the angular velocity of drive pulley increases until a limiting value is reached.

Keywords: CVT, Shifting, Dynamics, Transient, Response

Pages: 28 - 32 | DOI: 10.15224/978-1-63248-066-8-59

7. AN EXPERIMENTAL STUDY ON THE EFFECT OF PROCESS PARAMETERS ON SURFACE ROUGHNESS IN SINGLE POINT INCREMENTAL FORMING

Authors: SHAILENDRA KUMAR SINGH , AMOL PATIL , RAHUL JAGTA

Abstract: Incremental forming process has become more and more popular because of its ease of forming and capability to produce different part shapes using same machine setup. This paper describes an experimental study on the influence of process parameters in single point incremental forming (SPIF) on the surface roughness of formed part. Experiments are performed on cold rolled steel sheets (DC04) on a 3-axis CNC milling machine. Hemispherical headed tool of high speed steel material is used to study the effect of tool diameter, pitch, feed rate and spindle speed on the surface roughness (Ra) of formed part. Design of experiment full factorial plan is used for experimentation and results are plotted using ANOVA. Based on the experimental results, the equation (model) for Ra is developed using regression analysis. This model can be used to predict surface roughness of part to be formed. Considerable effect of tool diameter and pitch is found on the surface quality of formed part.

Keywords: Single point incremental forming (SPIF), surface roughness, ANOVA.

Pages: 33 - 37 | DOI: 10.15224/978-1-63248-066-8-60

8. RESEARCH ON MEASUREMENT AND INDICATION TECHNIQUE OF BOLT AXIS FORCE USING DEFORMATION OF BOLT SHAFT

Authors: HIROYUKI SASAGAWA , MASANOBU CHIBA

Abstract: Bolts have a significant impact the function of a wide range of mechanisms and often cause serious accident if applied incorrectly. Beyond lab tests, there has been no system available to accurately and cost effectively measure axial bolt loads during production and maintenance. This paper deals with the development of such a system. Axial load will be investigated by measuring the deformation of a bolt with a shank reamed concentrically using the calculations and by measuring the displacement of a fluid in void of the shank to determine the change in volume.

Keywords: screw, bolt, axis force, fluid, safety

Pages: 38 - 40 | DOI: 10.15224/978-1-63248-066-8-61

9. OPTIMIZATION OF METAL INERT GAS WELDING (MIG) PARAMETERS USING DESIGN OF EXPERIMENTS (DOE): A REVIEW

Authors: B.F. JOGI , M.B. TODKAR , N.S. TUPE , P.K. BRAHMANKAR , R.S. PAWADE

Abstract: Metal inert gas welding (MIG) is a fusion welding process having wide applications in various industries. In this process proper selection of input welding parameters is necessary in order to obtain a good quality weld and subsequently increase the productivity of the process. In order to obtain a good quality weld, it is necessary to control the input welding parameters. MIG welding parameters are the most important factors affecting the quality, productivity and cost of welding. This paper presents the influence of welding parameters like welding current, welding voltage, gas flow rate, wire feed rate, etc. on weld strength, weld pool geometry on the base material during welding. Design of Experiments (DoE) methods used to optimize the parameters for target quality. A plan of experiments based on Taguchi technique has been used to acquire the data. The objective functions have been chosen in relation to parameters of MIG welding bead geometry, tensile strength, bead width, bead heigh

Keywords: MIG welding, Optimization, DoE methods

Pages: 41 - 45 | DOI: 10.15224/978-1-63248-066-8-98

10. DEVELOPMENT OF A SAFETY SIMULATOR FOR LATHE TURNING

Authors: HIROYUKI SASAGAWA , MASANOBU CHIBA

Abstract: This paper deals with the development of a desktop safety simulator (“simulator”) to ensure safe lathe turning (“cutting”). The revolving center for supporting work in the cutting plays an important role of holding the work against come-off and fly-off, though the revolving center is inclined to be avoided partly because its usage is bothersome. One of the possible worst cases due to no use of the revolving center is that a fatal accident is caused by the work come-off and fly-off. The necessity of using the revolving center depends on the protrusion length of the work from the chuck. However, the judgment of such necessity is too difficult to make for those who are not familiar with the cutting. In view of the above, this study intends to conduct experiments of risky work come-off and fly-off in order to clarify the conditions of the work come-off and fly-off and reflect the experimental data in the configuration of the simulator. To the configured simulator, the cutting conditions ar

Keywords: Lathe Turning, Safe Operation, Simulator

Pages: 46 - 50 | DOI: 10.15224/978-1-63248-066-8-99

11. A FAST OPTIMAL SAMPLING-BASED MOTION PLANNING ALGORITHM BASED ON THE POISSON-DISK SAMPLING DISTRIBUTION

Authors: K.S.M. SAHARI , S.H. TANG , W. KHAKSAR

Abstract: Sampling-based motion planning algorithms have been proven to work well with difficult planning tasks in a variety of problems. Recently, asymptotic optimal algorithms have been proposed to overcome the non-optimality inefficiency of these planners but with extra computational costs associated with the additional processing requirements. In this paper, new extensions of optimal sampling-based motion planning algorithms are presented which overcome this drawback by utilizing the Poisson-disk sampling distribution. The proposed planners replace the original uniform sampling with the Poisson-disk sampling by defining a sampling radius along with the neighborhood radius in the original optimal planners. The main advantage of the proposed planners is their ability to reach different levels of optimality with fewer sampling attempts which reduces the running time of the planner significantly. The proposed algorithms have shown to solve different motion planning tasks with considerably smalle

Keywords: robotics, motion planning, sampling, poissondisk, optimal planning

Pages: 51 - 56 | DOI: 10.15224/978-1-63248-066-8-105