Advanced Materials Research Vol. 442

Abstract: To estimate the pose of large aircraft component in pose adjustment quickly and accurately, a real-time estimation method based on Unscented Kalman filter (UKF) is proposed. Firstly, in the process of the aircraft component adjustment, a rough value of aircraft component’s pose is acquired by using forward kinematic model and the displacement of positioners on real time. Then, position of a measuring point fixed on aircraft component is obtained by a laser tracker. At last, UKF is employed to integrate the previous rough value and the measuring point position for evaluating the accurate pose of aircraft component. Numerical simulation results show that the presented method is achieved easily, calculated fast and high accurate.

Abstract: Genetic algorithm, particle swarm algorithm such as rise intelligence algorithm have unique advantages in multiple objective optimization areas, using the algorithm, based on architectural construction, materials, environment, climate, usage and features and other aspects of the overall optimization, can quickly and effectively realize the comprehensive effect of building energy efficiency optimization goal. This paper discusses the problem of multiple building energy efficiency, and for intelligent algorithm in building energy saving the optimization technology on the comprehensive introduction, finally how to particle swarm algorithm is applied to building energy efficiency optimization was attempted.

Abstract: In order to guarantee the normal operation of marine, an effective fault diagnosis model need to be established to determine the reason causing the fault of marine diesel engine. According to the problem of fault diagnosis of marine diesel engine, by using the methods of kernel fisher discriminant analysis, a method solving fault diagnosis of marine diesel engine is proposed. Firstly, kernel fisher discriminant analysis was done to the historical fault set and the parameters were determined by grid method. In this way, the fault diagnosis model of marine diesel engine was built. Then, this model was used to diagnosis the actual fault of marine diesel engine. The effect of fault diagnosis in fuel injection system of MAN B&W 10L90MC marine diesel engine verified the effectiveness of this method. Therefore, the method proposed by this paper has certain practical significance towards the fault diagnosis of marine diesel engine.

Abstract: The thesis researches on repeated impact and deformation by using self-made repeated impact fatigue tester and selecting four groups of coating test specimen with different thickness. The thesis finds that test specimen have epistrophe effect under the deformation rules of repeated impact loading. And different coating test specimen with different thickness result in different results under the same repeated impact conditions: the total depths, total strain, deformation hardening degrees and deformation hardening depths are different. It is proposed that coating thickness should be increased to improve the ability of materials resisting repeated impact and deformation within a certain range. As to this experiment, the optimal coating thickness of specimen is obtained by preliminary analysis.

Abstract: SPR detection technique is widely applied in biology, chemistry and other fields. Usually the unknown sample is liquid, so automatic sampling control system is an important part of SPR spectrometer. This paper introduces an automatic sampling control system design as the core of microcontroller and step motor, of which the main function is to control the volume and speed of trace liquid sample according to the parameters set by operators via user interface based on LabVIEW software. The test results show that the system has the advantages of convenient operation, high intelligence, high accuracy and so on, compared with the traditional instruments.

Abstract: This paper proposes high-precision locating technology for high-speed & heavy load electric rail trolley in automatic port. Smooth starting/braking and precise positioning is necessary for power-driven rail trolley. This paper presents the soft start scheme and the “double stop” scheme in braking process. In the first stop process, the trolley speed is reduced using variable frequency speed control system. For the second stop process, mechanical braking is adopted for precision locating. Considering wheel-rail adhesion, the trolley braking acceleration is determined. Analysis shows soft start is able to achieve balance between acceleration and running stability of trolley, and “double stop” scheme can not only stop stably, but also achieve precise locating.

Abstract: This paper established multi-body dynamic model of block-crankshaft system by method of finite element substructure and multi-body dynamics, and carried out the distribution of dynamic stress acting on the crankshaft in a working cycle and on this basis carried out the fatigue strength analysis, then received the fatigue safety coefficient and fatigue life data of each part of the crankshaft.

Abstract: Loess foundations in seasonally frozen soil region are subject to severe effect of freeze-thaw cycles. This often results in water redistribution and structure weakening. So it is very important to study the physical-mechanical properties of loess under freeze-thaw cycles. In this paper, systematic study was carried out using freeze-thaw cycle machine. The impacts of freeze-thaw cycles on the physical-mechanical properties of loess including deformation, water distribution and dry density under the condition of filling water to loess samples were investigated. The results proved that the freeze-thaw cycles can increase the water content gradually from the bottom to the top in the loess samples under water supplied condition. The water content gradient reaches maximum at the freeze-thaw interface. The loess samples deform sharply at the early stage of the freeze-thaw cycles and then reach a stable status. The freeze-thaw cycles decrease the dry density of the loess samples gradually. The dry density at the top is lower than that at the bottom, due to more severe freeze-thaw effect at the top of the samples.

Abstract: A code control mechanism (CCM) was proposed in this paper to solve the complex many-to-many mapping problem in lifting appliances safety evaluation, in which, the complicated many-to-many constraints relation is replaced by the character string. The novel method can reduce the redundant data tables and improve the system efficiency. CCM can be extended to realize the object-typed many-to-many mapping in other area.

Abstract: In order to develop WUNAN Oilfield more efficiently, a numerical model was established for low permeability reservoirs with vertical fractured wells. Integral fracturing schemes were designed to optimize the rectangular five-spot well network in WUNAN Oilfield, and the results show that rectangular well network achieves better well productivity than square well network. Schemes with different well spacing and fracture parameters are designed by orthogonal method, with each scheme simulating for 10 years, the most economically beneficial scheme is the one with 300m well spacing, 125m row spacing, 60m half fracture length of water injection well, 105m half fracture length of production well, and 30μm2·cm fracture conductivity. Good production effect was achieved in field application, which provided technical support to a high efficient development in WUNAN Oilfield.