Transactions of the Canadian Society for Mechanical Engineering
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Volume 41 (2017), Issue 3
Fuzzy comprehensive evaluation method for symmetry degree of mechanical structure symmetry
Fan Liu, Zhiyong Ma
This paper proposes a fuzzy comprehensive evaluation method to determine the symmetry degree of three types of mechanical structure symmetries. In the proposed method, factors are set based on four symmetry elements; the analytic hierarchy process is used to determine the weight set, and an experiment was developed to determine the weight values. Based on the maximum membership rule, the type of symmetry of the evaluation object can be determined based on the evaluation result. Finally, instances were applied to illustrate the proposed evaluation method, which validated the proposed method is successful.
Optimization of ICE start-stop based on MPC for an HEV to improve fuel economy
Aiyun Gao, Xiaozhong Deng, Zhumu Fu, Mingzhu Zhang
To improve hybrid electric vehicle (HEV) fuel efficiency further, the decision as to whether the internal combustion engine (ICE) should start or stop is important. This paper presents a novel optimization method of the ICE start-stop by using the model predictive control (MPC) based on equivalent consumption minimization strategy (ECMS). The optimization method and flow of the ICE start-stop are described in detail. Three torque-split control strategies are proposed for the comparison purpose. From the ICE operating points, the fuel consumption and the battery SOC, simulation results reveal that the transient MPC strategy with ICE start-stop has a huge potential for improving the overall fuel economy.
Optimization of mechanical properties of E-Glass woven fabric composite
N. Azhaguvel, S. Charles, M. Senthilkumar
Manufacturing of composite material has been an extensive area of research as they have high strength-toweight ratio that are equivalent or superior to many metallic materials. This paper describes the preparation of E-Glass (woven fabric) Fiber Reinforced Polymer Composite (GFRP) with different fiber mat material, orientation and resin. The purpose of this paper is to investigate the influence of the process parameters on the mechanical properties of GFRP composite using Taguchi experimental design in combination with Grey Relational Analysis (GRA). The conclusion revealed that fiber orientation and resin were the most influential factor on the mechanical properties, respectively. It is observed that the optimum properties were obtained at 400 fabric mat, polyester resin, 45°/−45° orientation.
Investigation of surface integrity during turning Inconel 718
M. Anthony Xavior, M. Manohar, Mahesh Madhukar Patil, P. Jeyapandiarajan
Surface roughness and residual stress are considered to be major surface integrity issues that directly affect the quality and life of the components. The current research work highlights surface quality and residual stresses induced while machining Inconel 718 with a range of cutting parameters and cutting environments. Further, the study aimed to determine the optimal parameters/conditions in terms of cutting speeds, tool materials and cutting conditions to achieve better surface quality and minimum residual stress values. Minimum quantity lubrication resulted in minimum residual values for all cutting inserts and cutting velocities. The minimum surface roughness was obtained while machining at 100 m/min using a carbide insert under flood cooling condition.
On the difference between bounded Jacobian and Lipschitz observers for nonlinear estimatin applications
Gridsada Phanomchoeng, Rajesh Rajamani
This paper examines the performance of bounded Jacobian and Lipschitz observer design techniques for nonlinear estimation applications. The bounded Jacobian observer technique utilizes the mean value theorem to express the nonlinear estimation error dynamics as a convex combination of known matrices with time varying coefficients. The Lipschitz based observers are the most popular observer design technique used for nonlinear systems. But they are derived from more conservative Lipschitz conditions on the nonlinearity. Both observers are evaluated for longitudinal velocity estimation, vehicle roll angle estimation, and estimation in a polynomial nonlinear system with a large Lipschitz constant. The results show that the bounded Jacobian observer is the more appropriate observer for these problems.
Simulation of thermal energy storage: Study of system of phase change materials incorporated into building bricks
Abderrahman Madad, Azeddine Mouhsen, Taoufiq Mouhib
Based on energy conservation equations, a heat transfer model has been performed and numerically solved to study the thermal response of a brick filled of phase change materials (PCM-brick). Energy conservation equations have been developed and discretized. A simulation platform has been developed to produce dynamic simulations of incorporated PCM thermal behavior. The developed tool permits to carry out simulations for several materials that are included in the associated database. The behavior of the temperature inside of the PCM-brick has been evaluated and compared to that of an empty hollow brick. The effects of PCM type, incorporated quantity and location within the brick on the thermal response of this structure have been discussed.
Ancient Chinese maze locks
Kan Shi, Yang Zhang, Jian-Liang Lin, Kuo-Hung Hsiao
There are many types of ancient Chinese locks that were designed using thin pieces of barbed springs in the locks. The geometric relativity and the elasticity effect between the key and the barbed springs were the main mechanisms for locking and opening. For some special locks, it is very difficult to insert the key-head into the keyhole. In the operation, the key-head must contact the keyhole in the right position and the right orientation in order to enter the keyhole. Discovering how to insert the key-head is similar to steering a maze, so such locks are named “maze locks” or “fixed-orientation locks”. This paper introduces the structures of maze locks, which were widely used in ancient China. The historical development of ancient Chinese locks is briefly introduced first. Then, the basic characteristics of the barbed-springs lock are presented. Finally, three examples are provided to illustrate the opening processes of maze locks.
Development of an articulation robot arm
Kuo-Lan Su, Jian-Fu Weng, Jr-Hung Guo, Kai-Lu Cai
This article describes the design of an articulation robot arm with seven joints. The control core of the robot arm is the module-based system built using the Mitsubishi Q series programming logical controller (PLC). The robot arm contains seven AC servomotors, seven driver devices, a vision system and a PLC control system. The PLC-based controller programs the motion trajectory of the gripper to catch or hold the objects and finish the assigned tasks. Kinect system (Asus Xtion Pro-Live, or called RGB-D sensor) acts as the vision system to recognize shape and color of each object. During the experiments, we found that the robot arm recognizes the shape and color of each object, and catches each object moving to the assigned box with the same color.
On the characteristics of functional elements for innovative desk lamp conceptual design
Nien-Te Liu, Chang-Tzuoh Wu, Jia-Cin Li
Desk lamp designers tend to focus on the structure of lamps and not consider the option of incorporating new, innovative designs. Creative functional elements and innovative illustrations for desk lamps are proposed in this study. The main creative functional elements are lamp shades, bases, hinges, and pipes. There are three connecting types for these main creative functional elements: the assembled type, the composite type, and the integrated type. These principles are applied to create three creative functional elements and three connecting types that are subsequently used to generate three innovative conceptual designs.
Distinguishing sensor faults from system faults by utilizing minimum sensor redundancy
Morteza Taiebat, Farrokh Sassani
Automated Fault Detection and Diagnosis (FDD) systems depend entirely on the reliability of sensor readings. This paper fills an important gap in the literature by pinpointing the distinction between sensor faults and system faults in the monitoring process. The proposed methodology determines the minimum degree of sensor redundancy necessary to achieve this. A priori knowledge of physical relationships between monitored variables is used to check the credibility of sensor observations. The generalization reveals that for serially connected systems if the number of sensors is greater than 1.5 times of the number of monitored variables, the task of distinguishing between sensor and system faults can be accomplished with certainty, as long as serial causality is valid between the monitored variables. This is verified using a system of interconnected multi reservoirs and control valves.
Application of functional elements to the conceptual design of innovative human-powered vehicles
Nien-Te Liu, Chang-Tzuoh Wu, Yung-Chun Lin
The purpose of this paper is to propose a simple and quick process for creating new design concepts for human-powered vehicles. First, the design theme for an innovative bicycle is described. Next, the functional elements of the bicycle are selected according to the contents described in the design theme. Based on the design requirements, various spatial arrangements of the creative functional elements are produced. In the final step, we followed the flowchart of the creative functional elements constructed by this research and demonstrated a case study design.
Full journal title: Transactions of the Canadian Society for Mechanical Engineering
Abreviated journal title: Trans. Can. Soc. Mech. Eng.
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