Applied Mechanics and Materials Vols. 488-489

Abstract: In order to analyze the no-load voltage waveform and damper bars temperature of integral number slots large hydro-generator which the number of damper bars per pole increased, the 2D moving electromagnetic field-circuit coupling model of a 600MW integral number slots hydro-generator and 3D temperature field FE model of the rotor are established, and the no-load voltage waveforms and temperature are calculated. The research is helpful for improving design standard and enhancing the operation reliability of the large hydro-generator and electric network.

Abstract: Numerical simulation technology has been widely used to study the energy dissipation problem of hydroelectric engineering construction which combined flaring gate pier with stepped spillway. The main parameter of flaring gate pier is contraction ratio. This paper numerically simulated the length of aerated cavity and negative pressure of steps for stepped spillway combined with symmetrical Y-shape flaring gate pier which with the contraction ratio respectively of 0.4, 0.7 and 0.445. The RNG turbulence model ,VOF model of water vapor two-phase and iterative solution of geometry reconstruction format for unsteady flow has been applied to generate free surface. Velocity and pressure coupling method using PISO algorithm, with unsteady flow algorithm approaches stable solution of steady flow. And range from the upstream reservoir to downstream stilling basin. Comparatively analyze the experimental and simulation results of aeration cavity length, the two are basically in good agreement, and the maximum error is 10%. Therefore, the numerical simulation has a certain rationality and reliability. Simulation results show that aeration cavity length increased with the contraction ratio decreases, while the maximum negative pressure decreased, and more extensive distribution of negative pressure in stepped spillway.

Abstract: In this paper, we present a new algorithm for tower crane detection in images with multi-feature analysis. The image will be segmented into several objects first, and then for each object, its color, texture and geometric features are extracted, and at last, all features extracted are fed to a trained SVM to generate the final judgment. Experiments show that our algorithm can detect tower crane in images with high recall and precision.

Abstract: This study addresses a method for simulating a leaf dynamics on the basis of a 1/f noise method. Firstly, a 1/f noise with linear varying amplitude is used to simulate a selected leaf boundary detected and recognized. Secondly, a sample points operation is employed within its boundary after a corresponding reprocess is adopted, and then the corresponding body within its boundary is capable of being simulated. Finally, simulation for the leaf dynamics may be completed by using a dynamically rotating coordinates method. The experimental results show that this method has a better capability and can be used to realize simulation for the leaves with regular shapes to some extent.

Abstract: This text mainly completed the design of rice transplanters transplanting mechanism and the driving mechanism. Transplanting mechanism, the main working parts in rice transplanter, determines the quality and efficiency of mechanical planting. The paper adopts the crank rocker mechanism as a transplanting mechanism with a simple design and a high quality of planting. Driving mechanism can make the device operate accurately and reliably in a given trajectory and state. The driving mechanism driven by the diesel engine will transmit the power to the worm shaft through the coupler. Operated by the worm gear and worm drive, the power will be transmitted to the crank on the crank rocker of the transplanting mechanism through the chain transmission, making the cranks planting action in a given fixed path, then ensuring that the seedling smoothly and inserted straightly.

Abstract: The human pose model is the key technology of the human-computer interaction and action analysis and understanding. In this paper, an improved structural human pose model is proposed, it integrated the capability of the structural analysis in the picture structural model and the advantage of the free view of the simple staff model, with the attribute of the structure of the model, the capability of the grammar analysis is boosted up, it is the base of the human action analysis and understanding.

Abstract: Using the phase shift of reflection coefficient of SH seismic wave at the interface of strata, we derived the shift time of total reflected SH-wave, given formulae of shift time,The results show that for glancing wave or angle of incidence being near the critical angle, the shift time are very large. A large shift can be caused,In other angle of incidence the shift time is the same order of magnitude as the wavelength (period).

Abstract: Using the phase shift of reflection coefficient of SH seismic wave at the interface of strata, we derived the lateral shift and group time delay of total reflected SV-wave, given formulae of normal moveout of lateral shift, discussed the influence of lateral shift on normal moveout of SV-wave, and drawn the curves of normal moveout of lateral shift and the error of normal moveout caused by lateral shift with respect to the angle of incidence.The results show that for glancing wave or angle of incidence being near the critical angle, A large error can be caused by lateral shift; The error correction of lateral shift should be done before seismic data processing.

Abstract: T-145 turbocharger for 170 series turbocharged diesel engine supporting one type of supercharger. Product quality system certification involves turbocharger manufacturing quality and use of quality aspects. Production of quality products , including the product design quality , production organization , quality parts , components and standard parts supply , assembly quality. Use quality turbocharger can be achieved in the course of the performance indicators.These indicators are in the laboratory by the engine manufacturer turbocharger performance test data . User Quality is the key to life test booster . On the client problems is to charge by the turbocharger manufacturer . The same is the product acceptable identification of the content . Turbocharger product certification process is the production quality system certification. Also Turbocharger Manufacturing and production certification. Access system in the implementation of the product after the turbocharger manufacturer 's products to meet the requirements of industry management standards , but also meet the requirements of the engine plant . Therefore, a product required after the completion of the trial process through the identification . Used to determine the level of products .

Abstract: It is of great significance and value to predict the roll of two ships, especially when one is replenishing for the other or in some other conditions. Autoregressive time series analysis method (AR) with Recursive least squares (RLS) theory is the mainstream currently and the effectiveness for the prediction of the motion attitudes have been fully validated. However, there are some differences between the prediction for the motion of two vessels and for that of one. The hydrodynamic interactions between two ships should be taken into consideration and be reflected in the application of the method. In order to solve this issue, this work firstly proposed a double ships autoregressive (DAR) method, which can determine the orders and the parameters of model in real-time with consideration of the interference between two ships and the DAR method was applied to forecast the roll motion between two ships. The simulative results of DAR method show the validity and veracity compared to real value and the advancement compared to the autoregressive (AR) method for single ship motion prediction.