Applied Mechanics and Materials Vol. 307

Abstract: In this study, an adaptive neural network based fuzzy logic controller (ANNFLC) and a PI (Proportional and Integral) controller are used together as hybrid controller for deflection control of two degree of freedom building-like structure system against scaled Northridge Earthquake experimentally. Proposed structure consist of two floors with a shake table and a cart which is mounted on the second floor as active mass damping (AMD) and controlled by hybrid controller. Training and testing data of ANNFLC are determined by using behaviour of PI controlled system against Northridge. Thus, ANNFLC is created and it's control performance is combined with PI controller's effect to achieve small deflection responses of the floors. Obtained hybrid controlled results are compared with passive and PI controlled results and presented in the form of graphics.

Abstract: As to the power control protocol, in the CPC protocol each node uses the maximum transmit power choosed by all network nodes; the communication consumption of IPC protocol is smaller, but each node is using its own definition of transmission power, two-way link between nodes in the network can not be guaranteed. The sent power control based on data transmission can resolve the defaults of CPC and IPC.

Abstract: This paper presents the interactive driving profile generation system, which generates setpoint position’s signal, provided to the position and speed regulators. The system based on three equations, which create S-Function. The shape of each part of S-Function is calculated according to desired kinematic parameter values of a driven object. All the parts are connected together in such a way, that keep the parameters description of total movement’s time and total movement’s distance. The system works in interactive and real-time mode, which allows to set all kinematic parameters of movement in a fully dynamic way. The result of this work is an auxiliary block of Simulink software library.

Abstract: At first, this paper discusses the unfavorable environment where a tunnel is constructed by shield machine. As a novel solution, GPR is employed to detect some undesirable obstacles or geological conditions to ensure a smooth tunnel construction. After a brief introduction about the implementation of the detecting system, this paper raises the problem about the signal transferring between the antenna and the GPR body, and between the GPR and the control computer, which are far away arranged each other in two different cabins with relative rotating motion and under a very difficult connection condition. Two signal transferring methods, by cable or by wireless, and their advantage and limitations are discussed. This paper then proposes some key mechanical and electrical modifications on the central swivel joint or some other assemblies of the shield machine to meet the requirement for the signal transferring of the GPR. As this GPR system is supposed to be long-term online detecting equipment, this paper provides a dedicatedly designed power supply to replace the original DC power of the GPR.

Abstract: Transmission efficiency of the actuator is an important aspect affecting the performance of AMT. We design a test bench for transmission efficiency of AMT actuator, witch can be adapted to a wide variety of mechanism. We can get a conclusion that this developed test bench can meet the needs of studying transmission efficiency of AMT actuator and other worm gear transmission.

Abstract: This paper proposes a bilateral master-slave training systems which allows to directly transfer motion and force skills from the human operator to a real slave manipulator trough a master robot. For this, real and virtual surfaces are modeled by geometric constraints, which represent the surface where the task is to be performed. Thus, joint orthogonal decomposition into force and motion is considered. The holonomic constraint model and the joint orthogonal decomposition allow a stability analysis of the whole system, such that convergence properties in motion and force spaces are obtained. The effectiveness of our proposal is experimentally shown.

Abstract: This paper presents a numerical study of three dimensional flows around a self-propelled batoid with asymmetrically undulating pectoral fins. During the dynamic simulation, the difference of phase angle of the asymmetric motion is set to 180° between left pectoral fin and right pectoral fin. To evaluate the swimming performance of batoid with asymmetric undulating fins, kinematic and dynamic parameters have been used comparing with that of batoid with symmetric undulating fins. The simulation results show that asymmetric motion can achieve better starting and accelerating performance than symmetric motion.

Abstract: According to the biological characteristics of bamboo seedling, an automatic aeroponics growth system is developed for bamboo seedling and root observation, which can prepare good condition of water-fertilizer, air and warm during bamboo seedling. The ultrasonic atomizer is used to atomize the nutrient solution to the ultrafine particles of 1-5 microns diameter. Compared with traditional piezometrical atomization, this method can not only improve atomization efficiency of nutrient solution to promote uniform absorption at the roots, but also avoid the phenomenon of root-washing. In addition, considering the significant effect of temperature and humidity on bamboo root growth, a temperature-humidity control system is designed for automatic control of water-fertilizer and temperature in bamboo root growth environment. The system supplies an experimental platform with features of simple structure and convenient control. In the procedure of bamboo seedling, bamboo rhizome and shoot can grow fast because of enough moisture nutrition, good breathing, and low growth resistance. Furthermore, it is also convenient for morphologic observation of bamboo roots.

Abstract: This paper proposes replacement of a tele-controller system to base on DTMF in spite of tele-system web. It is found that telesystem with Dual Tone Multiple Frequency has a large capability in send-receiving of data in hardware and software. It dos not need to install of a PC for receiving and processing of data as tone modulated form from slave side. In other hand, its adaptive ability with different phone lines and no any need to spare devices of network such as net card or modem and no contribution from local networks of internet and finally different master interfacing capabilities with a single slave are examples of the advantages of the system. Also, synchronous using of internet lines like ADSL in other applications such as video image sending (due to system development) is one of the other advantages of it. This paper describes several interface system and control system with experimentally tests according to the ISO9283 standard and Delay-Time in this the Tele-Robot.

Abstract: Passive walkers perform a walking like stable limit cycle on small slopes without any external control. In this research, a deployed model of biped that can be built has been considered, and then its walking performance sensitivity such as efficiency, stability and robustness on uneven trains due to variation of structural parameters and their optimum limits have been investigated. It was shown that the foot arc radius and center of mass height have the most important effect on walking performance. After doing simulations in MSC.ADAMS software, an optimum design trend has been suggested. At the end based on experimental results, it was shown beside optimization of structural parameters, the impact condition is very important to achieve optimal walking.