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Browse Journal: IST Transactions of Mechanical Systems-Theory and Applications

Year: Issue Number:

Paper No Title Abstract
09-10-004 Design of a vehicle suspension system with Negative stiffness system Show Abstract PDF
  Md.Arafat Rahman, Park Sung Tae, Sjal Chandra Banik
Passenger comfort and vehicle control are the main two goals of every automotive suspension system. Comfort is provided by isolating the vehicles' passengers from the road disturbances like bumps. In luxury sedan, the suspension is usually designed with an emphasis on comfort, but in a passenger vehicle the rolls and pitches are given emphasis while driving and during turning and braking. In sports cars, where the emphasis is on control, the suspension is designed to reduce the roll and pitch, but comfort is sacrificed. But when it concerns the general purpose car then one has to consider low cost, comfort and controllability. Usually passenger car suspension system is passive one. The natural frequency of this type of suspension system is 1.0Hz to 1.5Hz. If the natural frequency of vehicle suspension system could be reduced then the transmissibility between chassis and seat will be reduced. Hence the passenger comfort will be improved. This paper presents a new suspension system with negative stiffness system for lower natural frequency.
09-10-002 Mathematical Modeling and Computation of Convective Flows in Liquid Systems with Special Effects Show Abstract PDF
  D. N. Riahi
This article reviews mathematical modeling and computational studies that have been done by a number of authors to study convective flows in liquid systems with special effects in normal gravity or microgravity environment. Microgravity conditions pose unique challenges for fluid handling and heat transfer applications. By externally imposing some constraint(s) on the flow system to control the buoyant and thermo-capillary convection, the latter being the dominant convective flow in a microgravity environment, significant advantages could be achieved in space based processing. Understanding and control of such flows has been the goal of a number of authors in the past who studied the mathematical models for such flows theoretically or computationally.
09-10-023 Production Inventory Models for Deteriorating Items with Stock Dependent Demand and Weibull Decay Show Abstract PDF
  S.V.Uma Maheswara Rao, K.Venkata Subbaiah and K.Srinivasa Rao
Inventory models play a dominant role in controlling and scheduling production processes. In this paper, we have developed and analyzed the inventory models for production processes with an assumption that the lifetime of the product under consideration is random and follows Weibull rate of decay. It is also further assumed that the demand is a function of stock on hand. Assuming that shortages are allowed and fully backlogged, the differential equations are derived and the instantaneous state of inventory is obtained. With suitable cost consideration, the total cost function is obtained. The optimal ordering quantity is derived by minimizing the total cost function. The sensitivity of model with respect to the parameters and cost is also studied.
09-10-020 Development of the Maintainability Index Template Show Abstract PDF
  Mohd Shahrizan Yusoff and Ahmad Baharuddin Abdullah
The objective of this paper is to present the development of maintainability index template. This template could assist the design engineer in determining the product efficiency at early design stage. The template was constructed based on several factors including product design criteria such as assembly method, number of components and sequence of the assembly, while the considered maintenance criteria such as maintenance rate and tool or equipment are used. This is a PC-based template, which was developed by utilizing Microsoft Access, Microsoft Visual Basic and Microsoft Excel software. Even though the template is still at an early stage of development, there are several potential advantages of the template such as that it can be directly linked to the internet and can be accessed online. Other than that it can easily be used.
09-10-003 Product Platform Architecture – A Manufacturability and Commonality Analysis Show Abstract PDF
  N. K. Aik and A. B. Abdullah
The paper discusses the product platform architecture of 3 in 1 household products. This paper focuses on the effect of modularity concept to the product platform architecture. The identified customer need from previous work will be projected into a CAD model. Then the manufacturability analysis will be carried out to determine the filling time of the designed product and the commonality analysis will be used to determine the common part or the percentage of part sharing between the new design compared to the existing product. The result indicated tremendous improvements in terms of filling time, part count and also product commonality.
09-10-015 Simulation of Motion Control of an Electric Vehicle Driven by Two Rear Hub-Motors Show Abstract PDF
  Yong Chen, Daming Zhang, Qiuli Zhou
An electric vehicle driven by two rear hub-motors uses direct drive configuration with motors attached to wheels to simplify drivetrain structure which can provide more space to vehicle layout and improve dynamic performance of vehicles. A four-degree-of-freedom model of an electric vehicle with two rear hub-motors is established. The proposed motion control strategy can adjust torque of driving wheels according to axle load shift, road adhesion condition and so on. The proposed model of the vehicle can be used to investigate influence of the number of degree-of-freedom on motion. The simulation results show that the control strategy can prevent the drive wheel from slip and are helpful to enhance vehicle performance.
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