Advanced Materials Research Vols. 156-157

Abstract: Novel filter media-water quenched slag particles (WQSP) were prepared using waste material- Water quenched slag, clay and pore-forming material with a mass ratio of 3:2:1. Compared with haydite, WQSP had higher total porosity, larger total surface area and lower bulk and apparent density. Tests of heavy metal elements in lixivium proved that SGSP were safe for wastewater treatment. In order to ascertain the application of WQSP ，WQSP and haydite were applied as the media of biological aerated filters (BAF) to treat municipal wastewater in two lab scale upflow BAFs. The results showed that WQSP reactor brought a relative superiority to haydite reactor in terms of chemical oxygen demand (CODcr) and ammonia nitrogen (NH3-N) removal at the conditions of water temperature ranging from 200C to 260C and DO ≥4.00 mg·L-1. Therefore, WQSP application, as a novel process of treating wastes with wastes, provided a promising way in water quenched slag utilization.

Abstract: Cable is the key component in the prestressed steel structure. In order to study the effect of cable elastic modulus and expansion coefficient on the prestressed steel structure, Suspendome of Tianbao Center was taken as the research object and APDL language is applied to write a corresponding program, thereby carrying out analysis to the model; The results indicate that the change of cable expansion coefficient and cable elastic modulus have a different effect on the performance of the suspendome: at high temperature, the effect of the expansion coefficient of hoop cable and radial cable is larger on the maximum displacement; at low temperature, the effect of the elastic modulus of hoop cable is larger on the support constrained force. Therefore, it is necessary to give precise linear expansion coefficient and elastic modulus for different cables.

Abstract: It is a spatial hydraulic-linkage mechanism of the lift-arm luffing mechanism of rotary drilling rig. During the operation, all of the reaction forces (torques) acting on the drill are transmitted to the swing platform by the mechanism. The design quality of the mechanism has a direct effect on the dynamic performance of the rotary drilling rig. A model based on the SWDM-22 rotary drilling rig developed by Hunan Sunward Intelligent Machinery CO., LTD was applied for the optimization study. The Lagrange equation was established on the basis of dynamic mechanics analysis of the equivalent planar hydraulic-linkage mechanism. The load of the hydraulic cylinder of lift-arm was solved and the objective function of the dynamic optimization was established. It is a relative complicated mechanism of the working device and the complete set of constraints were constituted by formulating the structural constraints, position constraints, kinematic constraints, dynamic constraints, and construction safety constraints respectively. The genetic algorithm was adopted to implement the dynamic optimization in consideration of the characteristic of the mathematical model. An optimized design was obtained and the value of the objective function was reduced by 12%. Some discussions about the influence of the evaluation of design variables on the objective function were made and some useful results were obtained.

Abstract: SmartCrown work roll contour has been brought in China for several years, but the research of crown control characteristics of SmartCrown work roll is lacking, especially the relationship and difference between SmartCrown and CVC work rolls. The paper researched the principle and design method of SmartCrown work roll contour first, and then the relation and difference between the SmartCrown and CVC work roll contours were pointed out, the crown control ability of different strip width was discussed too. From the analysis and research, it can be concluded that the contour angle of SmartCrown work roll contour is the most key factor for its crown control characteristics.

Abstract: Green design is a new design method which is proposed under the situation of energy shortage and environmental pollution. Based on the theoretical foundation of green design, it can be done to design the conveyor belt that is as one of the most important continuous transport machinery. And it can be used to satisfy the request to save natural resources and protect the environment in the meet the premise of work requirements.

Abstract: Structures often enduring random amplitude load or multilevel amplitude load. However, the test researches on fatigue often using equivalent amplitude load. It is very important for fatigue research that how to accurately evaluate structure’s fatigue properties of random amplitude load or multilevel amplitude load when only using equivalent amplitude load fatigue test results. According to damaging degree equivalent principle of multilevel amplitude load or random amplitude load, deduced equivalent stress amplitude calculation formula using linearity Miner accumulative damage rule and Corten-Dolan accumulative damage rule. Introduced the formula’s using method on fatigue detail or fatigue life evaluation. Utilizing the S-N curve and S-N equation from RC beams fatigue experiment, verified the formula aiming at 3 RC beams’ random amplitude fatigue experiment results, and it is indicated that the formula’s results had quite high precision and approached the experimentation result though it is partial security. The formula operated convenience and it had higher precision compared to similar formula, so the formula suit for engineering application.

Abstract: To reach the expecting goal of lower leakage ratio and longer operation life(lower wear ratio) for finger seal, great efforts have been made continuously to obtain good structure of finger seal with advanced optimization design technology. A cooperation Nash equilibrium mathematical model of multi-objective optimization for finger seal is presented in current work based on Nash equilibrium of game theory. In this solution, the reciprocal of leakage ratio and the wear ratio value for finger seal are thought as the payoff functions and the game is solved by genetic algorithm. The numerical simulation in the paper shows that the finger seal with better performances can be achieved by using Nash equilibrium method. This means Nash equilibrium method can be used as a new multi-objective optimization method for finger seal performances optimization.

Abstract: The robot control by PC through the wireless communication between the PC and the single-chip microcomputer not only expands the functions of the PC, but also creates more functions of the indoor service robot. Therefore utilization of the wireless communication between the PC and the robot can make full use of resources and improve the efficiency. The hardware of the indoor service robot includes the hardware of the robot control system and the hardware of the PC monitor system. The software of the indoor service robot consists of the software of the PC control software and the single-chip microcomputer control software. Therefore, the robot can autonomously walk along the track or walk under the manual control even when the robot is a long distance away.

Abstract: The nonlinear analytical modal of the double cranck ring-plate-type pin-cycloid planetary drive system with Multi-DOF was established. Furthermore, the influence of various parameters and clearance changing with time on dynamic response of the system was studied. The vibration mode, vibration modal and resonance frequency on various boundary conditions have been analysed, and a series of pertinent vibration and noise tests have been done. In the meantime, the machine structure and shape of main parts of the new prototype were improved to reduce vibration and noise，the dynamic characteristic optimization of the whole system was obtained. According to the results of theoretical and dynamic test analysis, the main influence factors have been found out. The theory of optimization design and method of the dynamic-response analysis of the double cranck ring-plate-type pin-cycloid planetary drive have been set up. And on the basis, the optimization design of the structure, parameters and toothpfile have been fulfilled. The theoretical basis has been provided in the design of new prototype.

Abstract: Maintaining the wellbore stability is a key factor for oil and gas drilling operations. In this paper, sock is regarded porous medium. Crevice pressure, effect of permeation and SD effect are considered. The elastic and plastic stresses around the wellbore sock were analysed according to MVM failure criterion. Distribution of stress and displacement was obtained, which can provide theory reference for the wellbore stability.