Applied Mechanics and Materials Vol. 722

Abstract: According to integrated circuit (IC) devices, this study proposed a integrated automatic design platform including geometric modeling, finite element simulation analysis, experimental design etc. The platform is a software system, the development of which is driven by product design of IC device chambers. As a module of the platform, the electromagnetic fields simulation part is based on secondary development of Ansys HFSS and the Python language to transfer data, build model and analyze automatically. The validity of the electromagnetic simulation module is verified by an example of PECVD SC300 chamber.

Abstract: The single chip Microcontroller STC89C52RC was used as controller in the system, the HC-SR04 ultrasonic module was used to send and receive ultrasonic, and the single chip Microcontroller can calculate the distance of the measured object by the time difference of sending and receiving of ultrasonic. In order to improve the measurement precision, temperature compensation method was used, the temperature can be obtained by the digital temperature sensor DS18B20,the LCD1602 was used to real-time display the distance and ambient temperature, this two values were sent to PC by serial port, the Visual Basic 6.0 was used to program the monitor interface, convenient remote observation. The realization method of the system hardware and software were presented in this paper, the experimental results show that the system has the characteristics of simple structure, high measuring precision, good stability, easy operation and so on.

Abstract: In this paper, intelligent fire-fighting robot as the research object, based on Mitsubishi FX2N series PLC, the establishment of intelligent fire-fighting robot control model and control system optimization, so that the fire-fighting robot among the various modules can be smooth and stable work together. Using L298 chip control two motors, the speed achieved by controlling the robot flexible steering, and using PLC produce different wave PWM stepless duty to ensure the smooth operation of the robot. Meanwhile, the detection of motor speed using encoder feedback to PLC will constitute a closed-loop control to achieve precise control and adjustment of robots routes. Intelligent fire-fighting robot each module to work together more quickly and safely find and reach the fire source and fight it.

Abstract: Manipulator has been widely used in industrial production because it can reduce labor intensity, improve the machining accuracy and reduce the number of dangerous operations manual operation. There are many kinds of control modes for manipulator trajectory. The PLC due to characteristics of low cost, simple structure, repeatable use, flexible programming ,it widely used in the control of the manipulator. This paper focus on the the software design and implementation. Through the simulation of the control system of manipulator, the PLC program design, debugging and running can achieve the expected control purpose and requirements, make the motion trajectory of manipulator in accordance with the relevant provisions. Based on the PLC programming, the manipulator can run in accordance with the requirements of running track.BackgroundWith the progress of science and technology, industrial production automation equipment demand is increasing day by day. Due to the reduction of labor intensity, improve the machining accuracy and less manual intervention operation risk, the manipulator has been more widely used in all walks of life.

Abstract: Manipulator of multiple degrees of freedom has been widely used in all kinds of rescue and exploring robots. This paper regard a kind of 6 DOF manipulator controller as the design object.The data acquisition for WDD35D4 sensors is carried by the C8051F020 microcontroller and sent through a wireless transmitter NRF905 after encrypted.Then the wireless transmitter NRF905 of the manipulator receives decryption. Through data processing and the steering gear adjustment, the angle of linear potentiometer corresponds to the angle of steering by 1-1. Then it drives the manipulator to work out and simulate the same motion of mechanical arm controller, and make real-time synchronization control.

Abstract: According to the non-stationary and non-linear characteristics of poultry voice and the situation that it`s hard to obtain enough sound samples, a poultry voice classification method based on Empirical Mode Decomposition (EMD), Teager energy transformation, and Support Vector Machine (SVM) is proposed. Firstly, the poultry voice signals are decomposed into a finite number of intrinsic mode function (IMF).Then, the Teager energy of five IMFs filtered are used to form characteristic vectors. Finally, the eigenvectors are put into a support vector machine classifier . The results of animal voice signals experimental recognition showed that this method had high accuracy and good generalization abilities even in the case of small number of samples. The approach proposed could identify the poultry voice effectively.

Abstract: Quartz crystal laser marking is the last process of quartz crystal production, and quartz crystal automatic feeding system works in harsh environment, like high frequency, strong electromagnetic interference, static electricity and large power, and feeding system itself also contains many electromagnetic interference factors, To ensure the system working stably and reliably, in the design and manufacturing of control system, using high quality components, the reasonable wiring and grounding, in the aspect of electromagnetic compatibility, hardware and software anti-interference measures were taken. Through a lot of test working in the laboratory and field, and the design scheme was modified for many times, it finally makes that the feeding system is so stable in the workplace that it could meet the requirements of the customer, and it has a certain guiding significance for the design of other mechanical and electrical products production.

Abstract: This paper discusses a kind of total wave force sensor, which includes the wave total force sensor principle design,the total force sensor structure design, measuring circuit design. And analyzes the relation between strain and the structure parameters at the position of strain gauge, the coordination between measuring circuit and structure. A more reasonable wave total force sensor structure has been synthetically selected. Cooperated with reasonable strain measuring circuit, the total wave force sensor has been designed, which is used to measure 3-D wave force and has promoted the wave total force sensor innovation and development.

Abstract: Shrinkage cavity and shrinkage porosity, often occurring during the production of heavy v-belt pulley roughcast, may lead to the decrease of the pulley performance and further result in casting rejection. Therefore, it is necessary to study the causes and prevention measures of shrinkage defects of the casting. The material of V-belt pulley roughcast at issue is HT250 and it adopts resin sand casting process. With a large amount of practice in workshop and times of revision of the design of foundry technology, we have found that the shrinkage in the hot spot of heavy v-belt pulley roughcast can be reduced or even eliminated to fully meet the performance requirements with a moderate control of pouring temperature and speed, an optimized design of foundry technology, and a strict limitation of chemical composition. This finding will bring illumination to the production process of other heavy pulley roughcast.

Abstract: A method of pre-mixing process augmentation for fuel combustion using dielectric barrier discharges (DBD) is presented. The mixing process of fuel and air can be augmented by the edge electric field of the electrodes because its transverse component will exert an electric force on the charge particles generated by DBD. The experimental results show that the combustion can be drastically influenced by this augmentation of pre-mixing process. A hollow flame caused by non-sufficient mixing, in which the air flow velocity is much larger than that of fuel gas, is used to demonstrate this kind of augmentation effects. Once the discharge is ignited, the hollow region in flame will gradually disappear. And further, the flame can propagate backward into the quartz tube. In this paper, the dependences of this kind of augmentation on the applied voltage magnitude and on the distance d from the electrodes to mixing region are examined. The critical voltages for hollow elimination and onset of backward propagation of flame are measured. The augmentation effects will vanish once the value of d exceeds 2cm, the hollow flame can not be changed even the applied voltage is very high.