Earticle

Detection systems in a range of fields including medical science, food safety, and environmental monitoring use miniaturized polymerase chain reactions that have lab-on-a-chip technologies. The chip used for a micro PCR needs the correction factor of the chip temperature sensor for the exact measurement and control of temperature. The correction factor of the temperature sensor is obtained from the chip, generated as a quick response code, and attached to the chip. A universal serial bus camera connected to a PC reads the QR codes, and the data from the QR codes is used to correct the measured temperature. However, because several USB cameras cannot be operated on a single PC, users must bear the inconvenience of physically connecting USB cameras to PCs for use. In this thesis, we establish a system that automatically turns the USB cameras on and off by operating solid state relay modules and a micro controller unit used in micro PCSs. As a result, preparing micro PCRs for experiments has become more convenient and less time consuming.

The process of pH neutralization reaction in sewage disposal is characterized with highly nonlinearity and hysteretic nature. In the thesis, first of all, it is described for the process of neutralization reaction in sewage disposal as well as its mechanism model, analyzed them by putting forward a strategy of NMPC based on Method of Genetic Optimization. The resolution of uneasy nonlinear optimization is to be made by utilizing Genetic Algorithm for an overall optimization, simple controlled parameters and etc. Simulation experiment gives us an explanation for this method to very good track of the settings of pH value with fast response time, ensuring an effective control for pH value.

This paper presents low-power Programmable Gain Amplifier (PGA) with a DC-offset cancellation for a direct conversion receiver (DCR) to reduce chip area, cost and power. In the receiver stage, the direct conversion architecture has simplified scheme as compared to the conventional super-heterodyne architecture because IF stage could be omitted in the direct conversion architecture, and the system can be a single chip. The PGA controls 8-level gains from 4dB to 60dB using the CMOS switches and passive resistors in parallel, and DC-offset circuit is based on a Miller effect technique. It is fabricated using Magnachip/SK Hynix 0.18-μm CMOS 1poly-6metal process. The proposed system showed excellent gain error of less than 0.24dB, very small die area of 0.015mm2 and low power consumption of 1.137mW.

Aiming at high nonlinear problem of special transmission gear invalidation analysis, provided a method which based on Meshless local Petrov-Galerkin method coupled with finite element method and method to solve fracture problem of special transmission gear. Simulation calculation has been done to non-involute beveloid gear developed by project team. Calculation result verified efficiency of the simulation method. The method has important meaning to novel gear development and research.

Serpentine locomotion of underwater snake-like robot is very complicated. In order to better control the motion state, a simulation model of underwater snake-like robot is established to investigate the relationship between the motion performance and the mechanical structure characteristics together with serpentine gait parameters. Based on the density ratio defined as the ratio of snake-like robot density to water density, the locomotion speed, output power and energy consumption of underwater snake-like robot is discussed. Further, with the optimum density ratio, the influence of serpentine gait parameters on the locomotion speed is analyzed. The simulation results show that the density ratio has great influence on the motion performance and the energy consumption of underwater snake-like robot, which can provide important basis for the research of underwater snake-like robot in terms of motion performance optimization and mechanical structure design.

In this thesis, it is presented the proposed development of the Switching MUX with the array transducer by use of Delay-And-Sum Beam-forming technology for a more accurate measurement. Among the several measurement methods, it is studied two ways, i.e. Pulse-Echo method and the radiation conductance measurement. In this paper, we propose to the multi-purpose Switching MUX all interfacing the two methods mentioned earlier. And it is verified that beam-forming control of the proposed equipment is smoothly implemented through simulation. And multi-purpose Switching MUX proposed in this thesis is modularized by 64ports in order to reduce the hardware size.

Deformation problems are main factors affecting the precision of machining the thin-walled parts. This paper focuses on the thin-walled parts of titanium alloy that is the difficult-to-machine material, based on the analysis of deformation characteristics and force, the milling force mathematical model of the ball-end milling cutter was established. On the basis of the 3D milling model of thin-walled parts of titanium alloy, the deformation regularity and cutting force variations were analyzed with the finite element simulation method. Through the experiments of machining thin-walled parts, the cutting force model was verified. The experiments results and simulations results match well. The work provides an effective basis for further study on the control of machining deformation of thin-wall parts of titanium alloy.

In this paper, we address the disturbance attenuation problem for a class of state delay switched linear systems with exponential uncertainties via switched state feedback and switched dynamic output feedback, respectively. By using Taylor series approximation and convex polytope technique, exponentially uncertain switched linear systems with state delay is transformed into an equivalent switched polytopic model with additive norm bounded uncertainty. For such equivalent switched model, we design its switching strategy and associated state feedback sub-controllers or dynamic output feedback sub-controllers so that whole switched model is asymptotical stabilization with H∞ disturbance attenuation based on multiple Lyapunov function technology and LMI approach.