Railway Wheel Wear Analysis

Wear due to wheel-rail critically influences railway operations. Wear of the wheel alters its profile which compromises the vehicle stability and increases the derailment risk. Past researches have focused on wear prediction due to wheel-rail interaction that crucial for different aspects such as running stability, passenger safety, comfort, life cycle optimization, and maintenance schedule. This research aims to provide an analysis of the comparison wear of the wheel and to analyze and compare the axle against wear rate. The data of wheel wear were measured by using the Calipri device. It is a wheel measurement device that is a highly precise measurement for predictive maintenance. The data obtained were analyzed deeply in order to see the pattern of wear rate of the wheel. The analysis shows that the wear rate increase in a smaller radius of the track curve due to the curve effect that happens because of friction between the wheels and the track. The lubrication system offers a potentially cost-effective means to reduce the wear rate of the wheels thus enhance rail wheels' life

Takaful (Islamic insurance) benefit: ownership and distribution issues in Malaysia

This paper aims at investigating the ownership of the Takaful benefit and the issues of hibah in nomination. The focus is made solely on the Family takāful because this type of policy is singularly related to death. In this regard, the question is raised as whether the money paid by the takāful operator on the death of the participant (death benefit) before the policy matures constitutes the participant’s estate or not, and secondly over the validity of making a conditional hibah of that takaful policy to a nominee as a sole beneficiar

Analysis of the Effectiveness of Brake Insulator in Decreasing the Brake Squeal Noise

Brake functions when two different materials are in contact to reduce a motion. Due to surface irregularity, this contact at high revolution and contact force produces irritating noise called brake squeal. This paper presents the study of introducing brake insulator into the brake assembly in order to reduce the noise. Different configurations of insulators are used in the Finite Element Analysis (FEA). The effectiveness of the brake insulator is analyzed using different type of materials. The finite element model of the brake is developed based on actual drum brake dimensions. FEA is used to for modal analysis to predict the modal frequencies and mode shapes. Various friction coefficients, wheel speeds and brake forces are considered in the analysis. The squeal is shown by positive real part of the baseline graph. The accompanied slip rate in the baseline model of the insulator increases the brake squeal noise significantly

Multibody Dynamics Models of Railway Vehicle Using Adams/Rail

This research is focusing on multibody dynamics modeling data and parameter comparison. The comfort and stability of railway vehicle suspension can be measured by using Ride Index Machine and other sensors. Complete model of EMU82 from KTMB is adapted to multibody software, ADAMS/Rail. With ADAMS/Rail, the behavior and characteristic of each suspension element can be determined. The accuracy of the simulation model is verified by comparing the result of body roll angle in Adams/Rail and the actual test. As for the experiment, certain test track will be chosen and simulated in ADAMS/Rail. The selection of track is based on the design and curvature characteristic. In experiment, data of roll angle and lateral acceleration are necessary. For that purpose selected sensors such as tri-axis accelerometer and gyro will be used. The running performance of the KTMB EMU82 suspension will be gathered from the simulation

ETL processes specifications generation through goal-ontology approach

The common design-related problems for extract, transform, load (ETL) processes are far away from being resolved due to the variation and ambiguity of user requirements and the complexity of ETL operations.These were the fundamental issues of data conflicts in heterogeneous information sharing environments.Current approaches are based on existing software requirement methods that have limitations on reconciliation of the user semantics toward the modeling of the DW. This will prolong the process to generate the ETL processes specifications accordingly.The solution in this paper is focused on the requirement analysis method for designing the ETL processes. The method - RAMEPs (Requirement Analysis Method for ETL Processes) was developed to support the design of ETL processes by analyzing and producing the DW requirements in perspectives of organization, decision-makers, and developers.The ETL processes are modeled and designed by capturing DW schemas and data sources integration and transformation. The validation of RAMEPs emphasizes on the correctness of the goal-oriented and ontology requirement model, and was validated by using compliant tools that support both these approaches.The correctness of RAMEPs was evaluated in three real case studies of Student Affairs System, Gas Utility System, and Graduate Entrepreneur System.These case studies were used to illustrate how the RAMEPs method was implemented in generating the ETL processes specifications

Requirements analysis method for extracting-transformation-loading (ETL) in data warehouse systems

The data warehouse (DW) system design involves several tasks such as defining the DW schemas and the ETL processes specifications, and these have been extensively studied and practiced for many years.The problems in heterogeneous data integration are still far from being resolved due to the complexity of ETL processes and the fundamental problems of data conflicts in information sharing environments.The understanding of an early phase of DW development is essential in properly tackling the complexity of ETL processes.The method to analyses the DW requirements from the abstract level (e.g. goal, sub-goal, stakeholder, dependency) toward the specification of ETL processes (e.g. extracting, filtering, conversion) are important in order to manage the complexity of the ETL processes design (e.g. semantic heterogeneity problems). However, current approaches that are based on existing software requirement approach still have limitations on translating the business semantics for DW requirements toward the ETL processes specifications.Moreover, the understanding of goal in the perspective of the organization and decision makers are important to ensure the semantic of DW requirements can be properly determined, organized, and implemented by the ETL processes. Therefore, the proposed method will utilize the ontology with goal-driven approach in analyzing the requirements of ETL processes

Modelling and validation of magnetorheological brake responses using parametric approach

Magnetorheological brake (MR Brake) is one x-by-wire systems which performs better than conventional brake systems. MR brake consists of a rotating disc that is immersed with Magnetorheological Fluid (MR Fluid) in an enclosure of an electromagnetic coil. The applied magnetic field will increase the yield strength of the MR fluid where this fluid was used to decrease the speed of the rotating shaft. The purpose of this paper is to develop a mathematical model to represent MR brake with a test rig. The MR brake model is developed based on actual torque characteristic which is coupled with motion of a test rig. Next, the experimental are performed using MR brake test rig and obtained three output responses known as angular velocity response, torque response and load displacement response. Furthermore, the MR brake was subjected to various current. Finally, the simulation results of MR brake model are then verified with experimental results

RETRACTED: Perkembangan Penulisan Ilmiah Berkaitan Sifat 20 Di Malaysia: Satu Sorotan

RETRACTEDFollowing a rigorous, carefully concerns, and considered review of the article published in Borneo International Journal of Islamic Studies, Vol. 1(1), November 2018 to article entitled “Perkembangan Penulisan Ilmiah Berkaitan Sifat 20 Di Malaysia: Satu Sorotan ".This article contained plagiarism and it has been found to be in violation of the Borneo International Journal of Islamic Studies and it has been retracted.The document and its content has been removed from Borneo International Journal of Islamic Studies and reasonable effort should be made to remove all references to this article

Experimental Evaluations on Braking Responses of Magnetorheological Brake

This paper presents experimental evaluations on braking responses of Magnetorheological Brake (MR Brake) at various current and load. The MR brake consists of a rotating disk that immersed with Magnetorheological Fluid (MR Fluid) where the fluid behavior is changing under influence of magnetic fields. The experiments are performed using MR brake test rig to obtain three output responses namely the angular velocity response, torque response and load displacement response. The MR brake generates maximum torque at high current and causes fast decrement of shaft angular velocity. The effectiveness MR brake torque happens at minimum load with low stopping time