Structural Design Method and Construction Procedures of "Edo - Tokyo Museum"

The Structured Systems Analysis and Design Method (SSADM) is the standard method for systems analysis and design in Government batch and transaction processing projects. In SSADM, analysis and design are clearly separated activities. Systems analysis is concerned with defining what has to be done, systems design with how it will be done.

In order to meet the requirements of high precision and rigidity of the two-dimensional turntable, it is necessary to carry out the structural design and position accuracy analysis of the two-dimensional turntable. The study found that the structure of the turntable, the resistance torque, the shaft structure, and the selection and design of the motor and sensor are all key factors affecting the performance of the two-dimensional turntable. In this paper, a method for structural design and simulation of a two-dimensional space turntable is proposed. In the process of structural design, these key factors are analyzed in detail, and the statics, modal and dynamic simulation analysis of the two-dimensional turntable are carried out using ANSYS Workbench software. Through simulation analysis, various indicators of the turntable are checked. Finally, it is concluded that the simulation results fully meet the requirements of the design indicators, which verifies the rationality of the design method and provides a strong basis for the structural design of the two-dimensional space turntable.

Research on multidisciplinary fatigue optimization design method in structural design of high speed train

Aiming at the engineering requirements of reducing the volume and improving the vibration characteristics of gears in the three-cylinder engine balanced system, a design and optimization method of gear structure is proposed based on the Design of Experiments (DOE) and proxy models. The paper analyzes the structure improvement process based on the gear design model and technical index requirements. By designing the plane characteristics of the weight-increasing module, the weight-reducing module and the elastic module, the calculation model of balance performance indices such as mass, moment of inertia and unbalance of new balanced vibration reduction gear are constructed. Then, a more efficient design method is proposed based on dynamic simulation and multidisciplinary optimization design platform (Isight). The results show that the new design method of gear structure can effectively reduce the structure improvement cycle. At the same time, the improved structure can reduce the thickness of the weight-increasing module by 6.3 mm and the vibration attenuation by more than 90%.

The subject matter of the article is the information technology of thematic segmentation of images of onboard optical-electronic surveillance systems. The goal is the development of information technology for thematic image segmentation of on-board optical-electronic surveillance systems using the system modeling methodology IDEF0. The tasks are: onboard systems of optical-electronic observation images features analysis, requirements for methods formulation , techniques and information technologies of segmentation of optical-electronic images, meta-heuristic methods for solving optimization problems analysis , development of information technology of onboard systems of optical-electronic monitoring images thematic segmentation. The methods used are: methods of probability theory, mathematical statistics, swarm intelligence, data clustering, evolutionary computing, optimization methods, mathematical modeling and digital image processing, analytical and empirical methods of comparative research. The following results were obtained. It has been established that the IDEF0 methodology is based on the SADT structural analysis and design method. In accordance with the syntax and semantics of IDEF0, the information technology of thematic segmentation of optical-electronic images of onboard surveillance systems can be presented in the form of: a tuple, an upper child diagram, and child diagrams. Conclusions. The scientific novelty of the results were obtained as follows: an applied information technology has been developed for image segmentation of on-board optical-electronic observation systems, in which, unlike the known ones, the system modeling methodology IDEF0 is used, which is based on the SADT structural analysis and design method.

This paper presents an optimization method for optimal engineering structure design. An interface procedure is essentially developed to combine the intelligent optimization algorithm and computer aided engineering (CAE) code. An optimization example is carried out to minimize the interlaminar normal stress of a laminate which affect the delamination failure of a laminate via arranging the stacking sequence. The analytical solution is calculated to validate the accuracy of optimization results.

Wearable ultrasound bioelectronics for healthcare monitoring

Due to their high strength to weight ratio, sandwich panels have become increasingly popular in various areas of structural design. This is particularly true with the aerospace industry where high strength low density materials play an important role in the fabrication of major structural components. Along with the continual quest for strong lightweight structures, recent optimisation methods in structural design have led to a re-examination of the validity of the traditional conservative designs based on the usual linear assumptions of structural analysis and tend to adopt more realistic approaches incorporating geometric nonlinearity of the structure by using more exact finite-displacement, strain-displacement equations.

Research on features of fabric construction and its structural design method under layered combination design mode is the key to innovative design of digital jacquard fabric.In this paper,a design method special for compound structure of jacquard fabric was introduced.Design theory is that setting a kind of all-coloring points for primary weaves before designing gamut weaves,the designed compound structure thus features no backed and all-coloring effect upon combination of weaves from two different weave-databases.This design method can be applied to design gamut weaves with any weave repeats and establish corresponding weave-database.And produced digital jacquard fabric features in steady construction and outstanding color shading effect.Besides,the number of superimposed color yarns in fabric construction should be arranged in an even value.

Due to surface-mounted permanent magnet (PM) high speed synchronous machines need a glass or carbon-fiber bandage to fasten the magnets to the rotor surface, which increase equivalent air-gap length and decreases efficiency of heat dissipation, so a claw pole motor with outer PM rotor is presented, which is without bandage. The design process of this motor for high speed application is introduced, and the method of structure design is analyzed, then a 5kW 40000r/min claw pole motor with outer PM rotor is designed. Finally the finite element calculation of magnetic field and dynamics analysis of outer rotor are finished, so the results of stress and modal analysis verify the feasibility of this machine.

Brushless doubly-fed generator (BDFG) has a good application prospect on the wind power generation field. In order to improve the power density, a new type of dual-stator brushless doubly-fed generator (BDFG) with magnetic-barrier rotor is presented in this paper. The overall structure design method and mechanical performance of DSBDFG is put forward and analyzed. In this paper, the stress analysis is carried out on the magnetic ring, the stationary shaft, end cover and chassis, and is determined its reasonable size and thickness, in order to achieve the purpose of stress analysis of this motor.

Fully permeable (or porous or pervious) pavements are pavements whose layers are all intended to be permeable. They are used to minimize the adverse effects of stormwater runoff generated from impervious surfaces. They may also be an effective solution for cool pavement strategies for improving outdoor thermal environments and mitigating heat island effects in hot climates. Most current applications of permeable pavements in North America are used for roads with a low traffic volume, basic access streets, parking lots, and recreation and landscaped areas, all of which carry light, slow-moving traffic. Structural design methods have been empirical in nature. Mechanistic–empirical approaches for fully permeable pavement designs have not been developed, but when available, would probably speed up the implementation of fully permeable pavements and potentially extend their use to pavements with a higher volume of traffic where appropriate. This paper summarizes the development of a mechanistic–empirical design method and design tool for permeable interlocking concrete pavements, which uses mechanistic analysis and partial validation with accelerated pavement testing results. A new example design table, based on the number of days with standing water in the subbase (0, 10, 30, 50, 90, and 120), was developed with an Excel spreadsheet-based design tool. The format of the table is similar to that of the current guideline for permeable interlocking concrete pavements of the Interlocking Concrete Pavement Institute. Designs for a specific set of project circumstances can be developed with the same Excel spreadsheet-based design tool used to develop the tables along with the hydrological design procedures provided in the Interlocking Concrete Pavement Institute guide.

A new structural design method is developed in this paper to improve the surface accuracy and enhance the performance of large deployable mesh reflectors. A self-standing truss with hard points (SSTHP), which is an additive pin-jointed structure, is composed of bar members and has zero internal mechanisms. The nodes of an SSTHP are hard points with little displacements when the stiffness of the structure is high in all directions. Through the implementation of the SSTHP, high surface accuracy, large effective region area, and nearly uniform member tension distribution are simultaneously achieved in the design of the reflecting surface of a deployable mesh reflector. The inclusion of the SSTHP also reduces the shape distortions of the reflecting surface caused by the deformation of the supporting structure. Those reflector performance enhancements obtained by the proposed design method are demonstrated in numerical simulations.

During the forging process, hot forging dies can easily sustain damage, including thermal softening, crack extension, wear and so on. The existing homogeneous hot forging die steel cannot meet the service performance requirements. However, the strengthening technology based on functionally gradient material (FGM) technology and surface cladding together can relieve the thermal stress. Based on the zoning of the temperature field distribution during continuous working, the structural design method and preparation process for the long life hot forging die are proposed in this paper; meanwhile, multilayer metal coating based on FGM was carried out and the temperature field, the stress field distribution for the homogeneous materials and the multilayer metal material hot forging die were analysed and compared. The results prove that using long service life hot forging die technology combined with FGM and surface cladding can relieve the overall stress value.

Short-term load forecasting is generally applied in power system real-time dispatching and day-ahead generation planning, which is of great significance for power system economic dispatching and safe operation of the system. Much research on short-term load forecasting using neural networks has been carried out at home and abroad. However, how to obtain the optimal network and structure evolution accurately and quickly has evolved into a key challenge for short-term load forecasting, because the prediction effect of the neural network method is more easily affected by the existing network structure and parameters, and the personality difference of the prediction object itself makes it difficult for the parameters to be reused. Aiming at this problem, this paper proposes a TPE-based neural network structure design and parameter optimization method for short-term load forecasting. This method realizes fast optimization of parameters of different types, structures, parameters, and input and output of deep neural networks, and is widely applied in Guangxi power grid. It is verified by an actual example that the method can effectively improve prediction accuracy.