Gongcheng Kexue Yu Jishu/Advanced Engineering Science

Rigid body guidance synthesis is a typical problem in mechanism design.In order to avoid the defects by traditional synthesis methods based on Burmester kinematic geometry theory,such as the limitation of mechanism structure type and the uncertainty of mechanism function,a generalized function oriented geometric synthesis method based on similarity transformation of the mechanism function modules was discussed.Since the standard mechanism modules were considered as basic design units for this method,the structure type of guidance mechanism modules need to be extended for a larger solution space,thereforethe geared linkage structure that can generate complex motion patterns was taken into account,aiming at the establishment of corresponding function module through kinematic analysis.At first,the transformation and mapping method between transmission function and guidance function were obtained through the configuration analysis of geared linkage,thus converting the transmission mechanism to the guidance mechanism through changing the rotation center of output gear.Secondly,the complex vector method was introduced for the kinematic analysis to obtain the guidance function,after that the geared linkage function module with full topology information was established,which included the transmission characteristics as well as the guidance characteristics,i.e. the relative dimensional parameters,the guidance angle performance, the guidance point trajectory and the motion geometric identifier.Then,in order to obtain the method for adjusting dimensional parameters of the preselected function module,a bidirectional mapping rule between relative dimensions and achievable guidance functions was revealed.At last,a practical guidance mechanism design task for powder production with partial parallel guidance function requirement was given, the similarity transformation of geometric identifier between geared linkage function module and the guidance task was presented, then the actual solution mechanism size and position parameters which meet the technical requirements were obtained. Finally the validity and practicability of the proposed generalized synthesis method were verified by the analysis of design results.

It has been showed directly or indirectly that the lubricant is possible to be sucked back into the mechanical seal with dimples or grooves in the existing studies.This phenomenon,termed "outlet suctio" in this paper,may decrease the leakage.Further studies are still required for this phenomenon and its mechanism.A three-dimensional fluid numerical simulation,based on the multiphase flow cavitation model in Fluent,was developed for the mechanical seal with inclined elliptical dimples.The causes of outlet suction and the influence of the outlet suction on leakage were studied by changing the differential pressure between the inner and outer diameter and the rotation rate.Firstly,in order to ensure the accuracy of calculation model,the fluid factor was calculated for the flow pattern check,the grid independence was tested for the grid size,and the simulation result was compared with the reference.Secondly,in the numerical simulation experiments,the phenomenon of outlet suction was observed directly in the streamline plots on the r-θ section of calculation unit beside the outlet section and the velocity distribution contours in radial direction on the outlet section.Thirdly,the pressure and radial velocity distribution on r-θ section was discussed.The results showed that the outlet suction occurs because the pressure close to the seal outlet falls below the external atmospheric pressure.This pressure decrease is caused by the hydrodynamic effect near the divergence gaps of dimples.The increase of hydrodynamic effect enhances the outlet suction.When the decreased pressure reaches the cavitation pressure,the cavitation occurs.The cavitation effect hinders the increase of outlet suction.Finally,the effect of Δp and n on outlet suction,and the effect of outlet suction on the leakage decrease were studied based on the analysis of the out flow rates and outlet suction flow rates.The leakage decreases because of the outlet suction,even to zero.The outlet suction caused by inclined elliptical dimples can be employed to decrease the leakage of mechanic seals.

The accurate calculation of boundary shear stress is very important to the deep understanding of sediment transportation and river evolution. The current research is limited to straight and mildly curved channels, while for a sharply-curved channel, the flow is complex accompanied by transverse circulation and large transverse slope which was affected by the dual effect of gravity and centrifugal force. As the boundary shear stress was affected by many factors, the applicability of differentcalculation methods requires further study. The distribution of three-dimensional flow velocity and dynamic-staticpressure difference were monitored by ADV as well as Preston tube in a 180° sharply-curved flume under the subcritical flow condition. The typical features of transverse flow circulation, redistribution of longitudinal flow velocity and turbulence kinetic energy were analyzed. Based on the analyses, four empirical formulae and k-ε model were selected to calculate the boundary shear stress on the control section of the flume. The computational results of turbulence kinetic energy method and Preston tube method agree well with the k-ε numerical simulation not only in distribution pattern but also in magnitude. Therefore, the above three methods are feasible for the calculation of boundary shear stress in a sharply-curved channel. The boundary shear stress in bed and bank slope of the whole flume was calculated by numerical simulation. The results show that the value of boundary shear stress is small and evenly distributed in thestraight section following the flow entrance, then gradually increases and exhibits non-uniformity in the bending section. Finally it reaches the maximum near the bank slope in the straight section in front of the outlet. On the transverse section, the boundary shear stress is well distributed along the bed while strongly fluctuated near the toe of slope in which the flow is complex with large circulation. Under the effect of the bend, the maximum boundary shear stress in the transverse section gradually shifted from convex bank to concave bank, in order to keep up with the mainstream. The maximal boundary shear stress of the flume is located in the convex bank of 110° cross-section of the bend and the concave bank of the cross-section 0.5 m downstream off the bend outlet. By changing the rate of flow but keeping the downstream water depth constent, the overall distribution of the boundary shear stress is similar and shows the characteristic of strong water flow along straight line while weak water flow along curve line. These researches provided support for flow shear transport mechanism, forecast of river evolution and safety management in the sharply-curved channel. © 2017, Editorial Department of Advanced Engineering Sciences. All right reserved.

In heterogeneous MPSoC,the parallel tasks were dispatched to each cores by task scheduling algorithm.Therefore,the performance of heterogeneous MPSoC directly was affected by task scheduling algorithm.A novel task scheduling algorithm with load-adaptive capability was proposed.In order to reduce the communication overheads,the algorithm divided task-set into task-subsets based on core types and tasks dependencies.Taking into the account of the cores load,then weighted bipartite graph was then created by task-subsets,cores and the execution efficiency of the task-subsets on each core.Finally,task-subsets were dispatched to appropriate load cores by finding a maximum weight matching in the weighted bipartite graph.In this way,the average scheduling length of task-set was reduced and the utilization of cores was improved,which jointly improved the performance of the heterogeneous MPSoC.Under the simulation scenarios with different number of tasks,maximum number of predecessors,number of core types,and number of cores,the proposed algorithm was quantitatively analyzed in terms of the average scheduling length of task-set and the utilization of the cores.The results showed that the proposed algorithm could effectively reduce the average scheduling length of task-set,and improved the utilization of heterogeneous MPSoC cores while achieving-adaptive loading.

With the increasing operation of hydropower stations, a refined generation dispatch model becomes more urgently needed for the precise control of cascade hydropower stations under deterministic runoff, such as rules extraction by simulation operation under long series runoff, optimal dispatch level evaluation of historical operation process, and etc. However, most of the studies on refined generation dispatch model focused on the refined description of transform relationships between hydropower and electric energy or hydraulic connection between cascade hydropower stations. The time scale of dispatch model, which is another important factor affecting the accuracy of dispatch model, was short of attention. The time scale of dispatch model affects theaccuracy of dispatch model in a complex way. This paper attempted to discover the influence between time scale and the accuracy of dispatch model by both theoretical analysis and case study. The control variable method and progressive analytical method were used to uncover the key factors which affect the accuracy of dispatch model and to analyze its influence rule qualitatively. The case study of cascade hydropower stations downstream of the Jinsha River has been conducted to analyze influence between time scale and the accuracy of dispatch model by these factors. With modeling analysis in different inflow conditions and water level control strategies, we have uncovered key factors which affect the accuracy of dispatch model quantitatively. Then we proposed a multiple time-scale generation dispatch model for accurate description of the dispatch problem. The simulation results show that the theoretic results proposed in this paper is sound. Moreover, the proposed model has a better performance on both accuracy and efficiency compared with other models, which means that this model can be used for historical operation evaluation and dispatch rules extraction of cascade hydropower stations downstream of the Jinsha River.