Papers by Keyword: Control Techniques

Abstract: A Quadcopter is a helicopter which has four equally spaced rotors, usually arranged at the corners of a square body. Due to four independent rotors, the need for a swashplate mechanism is palliated. The swashplate mechanism was required to allow the helicopter to utilize more degrees of freedom, but the same level of control could be obtained by adding two more rotors. The development of Quadcopter was stalled until very recently, because controlling four independent rotors was proven to be incredibly difficult and impossible without electronic assistance which has made even completely autonomous control of quadcopters feasible for commercial, military, and even hobbyist purposes. The paper offers dynamic simulation of brushless DC motor speed control used in a quadcopter and also focuses on design and implementation of PID (Proportional-Integral-Derivative) controller through simulation for proper controlling of altitude roll and pitch in a quadcopter. The effectiveness of proposed controller can be analyzed by considering the performances of peak time, settling time and overshoots for various set point changes in the throttle movements. All simulation studies have been carried out using the MATLAB software.

Abstract: According to the pharmaceutical industry produce VOCs and stench of atmospheric environment pollution, combined with typical pharmaceutical biological fermentation and chemical synthesis process of VOCs and odour pollution are classified 4 types:fermentation tail gas, recycling of exhaust gas, exhaust gas and wastewater workshop stench. The control technology should be selected according to the four types of waste characteristics.

Abstract: Software project quality management is the important work throughout the entire software life cycle, the effective implementation of software product quality control is an important means of improving software quality and reducing the cost. For the difficulty of quality control, research the control flows and techniques. First, describe the quality control process including prior quality control, matter quality control and afterwards quality control. Then, research the quality control flows through graphs. Finally, by combining graphs and textual descriptions to research quality control techniques, including four commonly used techniques such as cause-effect diagram, Pareto diagram, control chart and run chart. The results show that, through the study of quality control flows and techniques provide techniques and methods to support quality control and improve the science of quality management.

Abstract: The amorphous alloy dry-type transformer is one type of new energy-saving transformer. With the rapid development of amorphous alloy dry-type transformers, its vibration and noise also draws increasing attention. In this paper, the experiments of the amorphous alloy transformer core were carried out by vibration test systems. The influences of vibration in amorphous alloy transformer core under different support situation are analyzed. The influences of the winding under different sides and the Number of Windings are studied. It is shown that the boundary support has a greater impact on vibration of the core. The vibration of the core may be damped by exerting some restraint, especially in vertical direction. The different winding sides and the number of winding turns have little effect on the vibration of the core. The results presented in this paper can guide the application of the vibration and noise control of the amorphous alloy dry-type transformer.

Abstract: In the 21st century, diminishing water resources have become a global concern. The Taihang Mountain area plays an important role in the sustainable development of the Bohai coastal area in Beijing, Tianjin and Hebei because of its special geographical location and features; but due to drought and deficiency of water, the Taihang Mountain area is faced with the dual problems of poverty and ecological vulnerability. It seems particularly important to develop and utilize the water resources in a sustainable manner as water is one of the key factors in promoting local economic development and improving the ecological environment. This paper investigates, from the perspective of water cycle and water transformation, the seepage recharge mechanism in slopes and river valleys, taking into account the hydrological features of the Taihang Mountain area and the hydro-geological features of slopes and river valleys in the area. Based on analysis of the formation process and characteristics of shallow groundwater resources, this paper puts forth the idea of “weak water consolidation” for sustainable development of water resources, and three groundwater development and utilization techniques in respect of seepage through rock-soil interfaces and weathered rock fissures in slopes and seepage in river valleys, offering a powerful support to the economic development and environmental improvement in the Taihang Mountain area.