Advanced Materials Research Vols. 383-390

Abstract: The kinetics of TBBPA degradation by ozonation in semi-batch reactor was studied. The reaction rate constants of TBBPA with O₃ and •OH were measured by means of direct ozone attack and competition kinetics, and the values of which were 6.10 l/(mol•s), 4.8×109 l/(mol•s), respectively. Results of kinetic studies showed that TBBPA degradation by ozonation under the different conditions tested followed the pseudo-first-order. The values of apparent rate constant of TBBPA degradation increased with the increase of ozone dosage and pH, but decreased with the increase of initial TBBPA concentration.

Abstract: Without noise, the interpolation method of discrete spectrum is accurate except rounding error. However, the estimation accuracy is declined when a signal corrupted with noise, and even turns out to be meaningless. The paper investigates the influence of additive White Gaussian Noise on the accuracy of amplitude and phase based on interpolation method. Analytical expressions of the estimator variance for amplitude and phase correction are derived. Simulation results confirm the validity of the presented analysis.

Abstract: In this paper, an improved the radial basis function (RBF) neural network direct recognition approach to shape flatness pattern is proposed. The genetic algorithm (GA) is employed to obtain more optimal structure and initial parameters of RBF network. The new approach with the advantages of RBF, such as fast learning and high accuracy, is efficient and intelligent. it can not only effectively settle the problem of the different topologic configurations with changing strip widths but also improve practicability and precision.Compared to the improved direct recognition method with GA-BP,The simulation results show that the speed and accuracy of the flatness pattern recognition model based on GA-RBF are obviously improved.

Abstract: Low speed high torque direct drive motor has been widely applied in various industries. However, operation faults occur frequently due to the complex working conditions of the motor, especially the locked-rotor fault. Therefore, it is necessary to do deeply research in this case of the electromagnetic field and the temperature field distribution of the motor. Taking a 5kW, 10-pole tangential type Low speed high torque permanent magnet (PM) motor for example, based on field-circuit coupled finite element method, 2-D motor field, circuit and motion coupling is achieved. On this basis, the temperature field of the motor is analyzed. Finally the results which are consistent with the actual project are obtained.

Abstract: From the rheological theory, the combination of the rheological characteristic of melt spinning and principle of spinning, the paper researches the mathematical model of the velocity distribution and shear rate distribution when the melt flow in composite spinning sheath-core orifices. According to the mathematical model, the melt flow velocity and pressure characteristic of the composite spinning micropore are researched with the software of CFD-Fluent. The results for the design of composite spinning technology and components provide a good theoretical basis.

Abstract: Mathematical model of heat transfer process of a latent heat thermal storage tank was established, dynamic performance and melting process of cool storage tank were simulated by the apparent heat capacity method. the relation of melting rate along with time and cold thermal energy released along with time were obtained. The results show that no appreciable change in the total cold thermal energy released is observed for the increase of flow rate, whereas improvement on total cold thermal energy released due to the increase of inlet temperature is detectable. At the cool discharge condition, the best inlet temperature of storage tank is at 12°C-13°C.

Abstract: Accounting of the fact that there are so many SMR systems in the isolation practices and investigation that it is not convenient and efficient to deal with them, the paper presents a general model and its mathematical description of fully flexible vibrating suspension systems, in which both machines and bases are considered as finite or infinite flexible beams, by sub-structural mobility technique and transfer matrix approach. Then in accordance with the combination of subsystems and the two proposed optimal control strategies, the formulation of power flow is derived. Some simulations are performed to show the validity and the reliability of the presented model and to obtain some valuable results which can be regarded as a set of general benchmarks of suspension system designs.

Abstract: The paper establishes physical and mathematical model to study the laminar diffusion combustion, which is formed by concentric jet characteristics of DME/air. It uses commercial simulation software fluent to simulation laminar diffusion combustion process to get the temperature field distribution in different conditions and analyze the simulation results. Simulation results indicates that the faster fuel flow velocity, the higher combustion temperature and higher efficiency without rotate speed conditions, But with the rotate speed, the combustion temperature and the combustion efficiency decrease to half of their original. However, increasing fuel flow velocity on the basis kind of circumstance can make the combustion temperature and efficiency increased.

Abstract: This paper mainly describes the reasons for compressor surge and damage, and provide the traditional control method, which can not meet the growing needs, the improved control method, which according to the data using least squares curve to determine surge control regression equation and make the compressor operate safely by using the fuzzy PID control algorithm on the parameter adjustment.

Abstract: Flush air data system (FADS) have been successfully used on the nose tip of large manned/unmanned air vehicles instead of a traditional noseboom air data system. In order to integrate FADS with strapdown inertial navigation, high accuracy of angle of attack and sideslip is required. The estimated accuracy of angle of attack and sideslip in three types of FADS, which have different pressure ports layout, is compared using the nonlinear least squares theory. Evaluation function is provided to evaluate the accuracy of angle of attack and sideslip in different pressure ports layout. The results show that more sensors and radiation-type can provide high accuracy.