The paper is focused on the application of artificial neural networks (ANNs) in predicting the natural frequency of basalt fiber reinforced polymer (FRP) laminated, variable thickness plates. The author has found that the finite strip transition matrix (FSTM) approach is very effective to study the changes of plate natural frequencies due to intermediate elastic support (IES), but the method difficulty in terms of, a lot of calculations with large number of iterations is the main drawback of the method. For training and testing of the ANN model, a number of FSTM results for different classical boundary conditions (CBCs) with different values of elastic restraint coefficients (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mi>T</mml:mi></mml:mrow></mml:msub></mml:math>) for IES have been carried out to training and testing an ANN model. The ANN model has been developed using multilayer perceptron (MLP) Feed-forward neural networks (FFNN). The adequacy of the developed model is verified by the regression coefficient (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi>R</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:math>) and Mean Square error (MSE) It was found that the R2 and MSE values are 0.986 and 0.0134 for train and 0.9966 and 0.0122 for test data respectively. The results showed that, the training algorithm of FFNN was sufficient enough in predicting the natural frequency in basalt FRP laminated, variable thickness plates with IES. To judge the ability and efficiency of the developed ANN model, MSE has been used. The results predicted by ANN are in very good agreement with the FSTM results. Consequently, the ANN is show to be effective in predicting the natural frequency of laminated composite plates.
The principal uses of threads are fastening, adjusting, and transmitting power. In this section we consider power screws. A power screw is used to convert a rotary motion into a linear motion for power transmission. Power screws should be designed for smooth and noiseless transmission of power with an ability to carry heavy loads with high efficiency. Power screws are capable of producing uniform motion. This chapter on mechanical power screws describes and examines the power screw design process, and provides examples and solved/unsolved problems. The chapter is equipped to study force and stress analysis as well as calculation of the load-carrying capacity of different types of power screws, such as square and Acme screw threads. This chapter can be used as teaching material in courses on machine design for mechanical and industrial engineering majors in colleges and universities, and can also be used as a reference for scientific and technical personnel engaged in scientific and engineering calculations.
The applications of robotics in medical field have increased extensively in the last two decades. The aim of this paper is to study the effect of trajectory planning method duration time on correct dynamic response selection of six degrees of freedom micro-robot intended for surgery applications using two different methods of trajectory planning with different four duration times (5, 10, 20 and 60 s). The kinematic equations of motion were obtained using Denavit-Hartemberg representation. The dynamic equations of motion, which are important for the proper design of robot controller, were first derived using the LagrangianEuler technique. Then, the required hub torque to move each joint was calculated for the motor selection. The trajectory planning was derived using two different methods of trajectory planning with different four duration times (5, 10, 20 and 60 s). These methods are the fifth-order polynomial and soft motion trajectory planning. A comparison of the trajectory planning and dynamic response for the different four duration times was carried out of the two different methods of trajectory planning to choose the best duration time and the best method of trajectory planning that gives the correct dynamic response, smooth set trajectory planning and best performance of the robot under investigation. The simulation results were obtained using MATLAB software.
Machine design is an important part of mechanical engineering, the first step in mechanical production, and the most important factor determining mechanical performance. The goal of machine design is to design the best machinery under various limited conditions (such as materials, processing capabilities, theoretical knowledge, and calculation methods): that is, to create optimal designs. This chapter provides readers with an introduction to machine design principles. It begins with the fundamentals of machine design, such as design codes and standards, design organization, design considerations, and basic procedures of machine design. This chapter can be used as teaching material for courses in machine design for mechanical, industrial, and materials engineering majors in colleges and universities, and can also be used as a reference for scientific and technical personnel engaged in scientific and engineering calculations.
The phenomenon of hysteresis in engineering systems has been with us for ages and has been attracting the attention of many investigators for a long time [...]
With the emergence of the Internet, a large quantity of data are generated by the communication network, largely triggered by human activity. Adding to this,
Structural health monitoring (SHM) of civil infrastructures has become one of the fastest-growing research areas over the past two decades. SHM has evolved into measuring, processing, collecting, and storing massive amounts of data to provide valuable information for...
