Hollow integrated sandwich composite is a new kind of 3D-woven sandwich composite which has a good integrated capability. It is and will be more and more widely used in aviation, aerospace, marine, automobile, architecture, chemical industry and other fields. Therefore, it is important to carry out theoretical and experimental investigations for this material.In this thesis studied the structural design,weaving process and the micro-geometry structure of hollow integrated sandwich composites.Then a mechanical model is build to predict its mechanical properties, experiments are performed to verify the predicted results. At last performed on both the new and traditional honeycomb sandwich composites through experiments.This topic first issued the structure and weaving process about the pre-forming textile, using transformed single rapier as well as double sending warp axis to off-warp. We innovative design “reverse-weaving” method to form the core, lead to the pro-forming textile as “8″ shape in space and this linking warp connected top and bottom panel to an overall structure.The text followed by micro-geometry structure of hollow fabric, get the smallest unit and every geometric parameters of the fabric, which including two parts of panel and core. As well as fiber’s volume content. According to the calculation of the elastic constants related to elastic properties of composites material, we can use finite element analysis to study mechanical properties and establish the finite element analysis model (Ansys model), forecasting bending stiffness, tension performance, pressure strength, side-tensile strength and side-press performance of the “8″ shape overall hollow structure composites.Finally we contrast both the overall hollow structure composites and traditional honeycomb sandwich composites through experiments, which including tension, pressure, bending and shear tests. The results show that tension, bending and shear property of the overall hollow structure composites all super to traditional honeycomb sandwich composites, however the pressure strength is similar to honeycomb sandwich composites. So to note the overall hollow structure composites can replace honeycomb composites.

With the rapid development of petrochemical industry,demand of oil in our country increases evidently. Then the inadequate oil supply is the austerity problem to which our country have to face. A large number of vertical crude oil storage tanks need to be built so that national normal strategic oil reserve could be assured. However, current domestic technology of foundation design and construction of large storage tanks are still immature. Consequently, research for foundation of large storage tanks is of practical significance providing scientific basis for the design of storage tanks. Research works done in this paper are as following:Models of ringwall foundations and pile foundations of 100,000 and 150,000 cubic meters oil tanks are established with large finite element general application ADINA.Impair to the lateral earth pressure of cushions which are inside the ringwalls of 100,000 and 150,000 cubic meters oil tanks are contrasted between the pile foundation and ringwall foundation. At the same time, the changing trend of max annular tension force in water-filled pre-pressure stage and discharge status are analyzed also.The pile foundation and ringwall foundation’s settlement and uneven settlement of 100,000 and 150,000 cubic meters oil tanks in water-filled pre-pressure stage and discharge stage is analyzed.The additional stress to the pile foundation, ringwall foundation of 100,000 and 150,000 cubic meters oil tanks and basis from the upper structure in water-filled pre-pressure stage is studied.All the results gained form those finite element analysis are compared with the norms. Further analysis about mechanical behavior of the oil tanks is conducted and corresponding conclusions are of important reference value for future design.

With the rapid development of petrochemical industry,demand of oil in our country increases evidently. Then the inadequate oil supply is the austerity problem to which our country have to face. A large number of vertical crude oil storage tanks need to be built so that national normal strategic oil reserve could be assured. However, current domestic technology of foundation design and construction of large storage tanks are still immature. Consequently, research for foundation of large storage tanks is of practical significance providing scientific basis for the design of storage tanks. Research works done in this paper are as following:Models of ringwall foundations and pile foundations of 100,000 and 150,000 cubic meters oil tanks are established with large finite element general application ADINA.Impair to the lateral earth pressure of cushions which are inside the ringwalls of 100,000 and 150,000 cubic meters oil tanks are contrasted between the pile foundation and ringwall foundation. At the same time, the changing trend of max annular tension force in water-filled pre-pressure stage and discharge status are analyzed also.The pile foundation and ringwall foundation’s settlement and uneven settlement of 100,000 and 150,000 cubic meters oil tanks in water-filled pre-pressure stage and discharge stage is analyzed.The additional stress to the pile foundation, ringwall foundation of 100,000 and 150,000 cubic meters oil tanks and basis from the upper structure in water-filled pre-pressure stage is studied.All the results gained form those finite element analysis are compared with the norms. Further analysis about mechanical behavior of the oil tanks is conducted and corresponding conclusions are of important reference value for future design.

With the rapid development of petrochemical industry,demand of oil in our country increases evidently. Then the inadequate oil supply is the austerity problem to which our country have to face. A large number of vertical crude oil storage tanks need to be built so that national normal strategic oil reserve could be assured. However, current domestic technology of foundation design and construction of large storage tanks are still immature. Consequently, research for foundation of large storage tanks is of practical significance providing scientific basis for the design of storage tanks. Research works done in this paper are as following:Models of ringwall foundations and pile foundations of 100,000 and 150,000 cubic meters oil tanks are established with large finite element general application ADINA.Impair to the lateral earth pressure of cushions which are inside the ringwalls of 100,000 and 150,000 cubic meters oil tanks are contrasted between the pile foundation and ringwall foundation. At the same time, the changing trend of max annular tension force in water-filled pre-pressure stage and discharge status are analyzed also.The pile foundation and ringwall foundation’s settlement and uneven settlement of 100,000 and 150,000 cubic meters oil tanks in water-filled pre-pressure stage and discharge stage is analyzed.The additional stress to the pile foundation, ringwall foundation of 100,000 and 150,000 cubic meters oil tanks and basis from the upper structure in water-filled pre-pressure stage is studied.All the results gained form those finite element analysis are compared with the norms. Further analysis about mechanical behavior of the oil tanks is conducted and corresponding conclusions are of important reference value for future design.

With the rapid development of industry, the rely for oil is larger and larger, the demand for oil with better performance, the pipeline is one of the main energy sources. The safety of pipeline is very vital to one country, however, the case that the pipeline was destroyed. The destroyed of pipeline for natural or man-made is preparation in their transport course. The pipeline stopper took significant part in the maintain process.With the development of computer technology, owing to the characteristics of short periods、low cost、high precision, the analysis of the Finite Element Method (FEM) has became the general way to solve the complex company problems. The FEM technology is widely used in the design of engine parts, and improves the reliability of design, optimizes the structure, shortens the periods of design, declines the cost of design, thereby increases the competition of products in the market.The working state of the DNF pipeline stopper was analyzed; Baffle and knighthead problem of pipeline stopper crossing-over were analyzed by method of combining of material mechanics, dynamics and FEM, analyzed the working states of the baffle system and knighthead system. At last, mathematical model was created and illustration analysis was gotten on the process of analysis.The stress states were seen, creased the stopper model by Pro/E and assembled and dynamic simulated. The reciprocity among the every model was clearly seen and the worry was broke out in the design process. large number of money and time which we can cost in trails, were saved.On the basis of knowledge of finite element of the device in-depth analysis, used the contact nonlinear analysis to carry on the analysis to the back plate system, obtained baffle stress distribution situation and the change rule, to carries on the finite element simulation unyielding, discovers should set up the focus point, the design development and the equipment improves lays the good foundation. Using the finite element method to pipeline’s static, and carries on the contrastive analysis, thus causes the conclusion even more rationalize and the scientific style, in the entire parsing process, used the APDL language to establish each question ANSYS procedure, was advantageous carries on the pipeline trap similar question the analysis processing.By those research works, we summarized some experiments of analysis and disposal, and accumulate lots of basic data. We have been the precedent of using the advanced design technology in the process of exploiting and designing the new products, especially in the main structure capability. That establishes the base for generalizing the use of the FEM technology and further designing for the high quality engine, which has the significant demonstrating meaning for the improvement of enterprises’exploring capabilities and the work of pipeline’s design and exploitation for the future.

With the rapid development of industry, the rely for oil is larger and larger, the demand for oil with better performance, the pipeline is one of the main energy sources. The safety of pipeline is very vital to one country, however, the case that the pipeline was destroyed. The destroyed of pipeline for natural or man-made is preparation in their transport course. The pipeline stopper took significant part in the maintain process.With the development of computer technology, owing to the characteristics of short periods、low cost、high precision, the analysis of the Finite Element Method (FEM) has became the general way to solve the complex company problems. The FEM technology is widely used in the design of engine parts, and improves the reliability of design, optimizes the structure, shortens the periods of design, declines the cost of design, thereby increases the competition of products in the market.The working state of the DNF pipeline stopper was analyzed; Baffle and knighthead problem of pipeline stopper crossing-over were analyzed by method of combining of material mechanics, dynamics and FEM, analyzed the working states of the baffle system and knighthead system. At last, mathematical model was created and illustration analysis was gotten on the process of analysis.The stress states were seen, creased the stopper model by Pro/E and assembled and dynamic simulated. The reciprocity among the every model was clearly seen and the worry was broke out in the design process. large number of money and time which we can cost in trails, were saved.On the basis of knowledge of finite element of the device in-depth analysis, used the contact nonlinear analysis to carry on the analysis to the back plate system, obtained baffle stress distribution situation and the change rule, to carries on the finite element simulation unyielding, discovers should set up the focus point, the design development and the equipment improves lays the good foundation. Using the finite element method to pipeline’s static, and carries on the contrastive analysis, thus causes the conclusion even more rationalize and the scientific style, in the entire parsing process, used the APDL language to establish each question ANSYS procedure, was advantageous carries on the pipeline trap similar question the analysis processing.By those research works, we summarized some experiments of analysis and disposal, and accumulate lots of basic data. We have been the precedent of using the advanced design technology in the process of exploiting and designing the new products, especially in the main structure capability. That establishes the base for generalizing the use of the FEM technology and further designing for the high quality engine, which has the significant demonstrating meaning for the improvement of enterprises’exploring capabilities and the work of pipeline’s design and exploitation for the future.

Chinese manufacturing industry faces great opportunity and big challenge, and the machine tool industry is the hard core of the manufacturing industry. Traditional products design and development procedure generally contains sketch design, drawing design, physical prototype manufacture and prototype experiment. This procedure makes long period and costs highly, which can not meet the integrative needs of quality, efficiency and cost. But virtual prototype technology is a kind of completely new one, whose emergence and development brings an innovation to the traditional way of products design. By applying this technology, engineer can make various simulation and analysis on the built virtual digital model of the product, which could help them to find out the potential problems and mistakes of the product in the design period, and then they can amend the mistakes and improve the design sketch quickly. Therefore, applying virtual prototype technology in the process of product design could reduce its dependence on the physical one, which could reduce the development cost, cut the development cycle, improve the design quality and product performance and increase the competition capability of the enterprise.NC machine tool is important and infrastructural equipment enterprise for reconstructing traditional industry and building digital enterprise. As a mechanical and electrical product with complicated structure and high automation, its design has the rigorous requirements on kinematic capability, dynamic capability, mechanical structural capability and machining capability. To assure the design quality of NC machine tool, cut the design period and reduce the design cost effectively, virtual prototype technology should be introduced into the whole design procedure of this product. This paper studied the TH5650 vertical NC boring and milling machine, according to the design requirement, use large-scale three-dimensional software UG to set up the three-dimensional parameter entity’s model of the numeric machine tool. Through the graphics interchange format of computer, introduce the geometry models established into ANSYS and UG Motion.With UG Motion on the base of kinematics and dynamics emulation,certificated and analysed the main factor about machine tool creep,and analysed the kinesi stationarity of the TH5650 vertical NC boring and milling machine, then gave some optimization suggestion of the NC milling machine feeding system. On the finite element analysis flatform of ANSYS Workbench, through modal analysis get the natural frequency and the main modal of the machine structure, optimize the structure of machine tool. After completing the simulation analysis, evaluate kinematic & dynamic capability, structure capability and machining capability roundly. It also provided the design with quality assurance and the milling machine improvement with reliable warrant. It not only decreased the design cost greatly, cut the design period enormously when guaranteeing the ultimate quality of the milling machine, but also make the product come into the market as possible as quickly, which brought huge economy benefits to the enterprise.By applying virtual prototype technology, this paper realized the modeling and simulation of the NC milling machine. This method is not only suitable for the design and development of milling machine, but also forthe other machine tool products. And it also can be extended to research, design and develop other mechanical system with complicated structure. So the research method and the consequence in this paper have the significant practical value.

In recent years, high efficient continuous casting technology has been looked as the primary tendency during the development of continuous casting, how to improve the quality and output of continous casting slab has been more interested. And the longitudinal crack rate of peritectic steel is much higher than other steel grades since wide slab was put into production at Wide Plate Plant.Two-dimentional (2-D) finite-element heat-transfer and stress models with moving coordinates were established to predict temperature and distribution of stress in a continous casting mold for steel slabs during operation. The effects of width of slab and operating conditions on distribution of stress on slab surface were analyzed in details, as summarized in the following.(1)At the mold exit, the distribution of the thickness of solidified shell was not even. In the wide face of slab, the thickness of solidified shell was more than 20mm near the center, and it was only 15mm near the corner.(2) The stress of the peritectic steel in the center place of slab was higher than non-peritectic steel.In the same conditions, the peritectic steel was much easier to form longitudinal crack than non-peritectic steel in the center place of slab.(3)In continous cast of peritectic steel slab, with the slab became wider, the stress on slab surface was increasd. In the center of the wide face, the incease was obvious; and the longitudinal crack was easier to form. The positions of the cracks were in the center of the wide face.(4) With the slab (3200mm×150mm) casting speed increased from 1.0m/min to 1.2m/min, the stress in the wide face center was decreased. And the amount of longitudinal crack in this area was decreased either. With the casting speed increased to 1.5m/min, the stress was inceased in the area which was 200mm from the center point of the wide face; the longitudinal crack was easier to form in this area. (5) With the slab (3200mm×150mm) superheat degree increased from 15℃to 25℃the extremum of the stress moved to the center of the wide face, and the possility of the longitudinal crack was was increased in this place.(6) With the slab cooling intensity increased, the surface stress was inceased. With the flow rate of cooling water changed from 6000L/min to 5500L/min, the slab surface stress was decreased. And the possility of the longitudinal crack was reduced. But the stress in the corner place was increased, and the shell thickness was getting thinner, the possibility of corner crack and steel breakout was increased.

As CNC machine tool is developed in high speed, high accuracy, and high efficiency direction, Dynamic design method is needed to upgrade the competitive power of our machine tool in world. Its key factor is the configurating of accurate dynamic model of machine tool including joints. Linear Rolling Guide way (LRG) is one important functional unit of CNC machine tool, which has prominent effect on performance of machine tool. So, research on dynamic performance of LRG joint has important meaning on upgrading the level of design and manufacture of our machine tool.This paper made oneself design experiment system as the research object. The primary idea is researching the dynamic performance of LRG joint using both theory and test and establishing its finite element model, researching the method of establishing the finite element model of experiment system including LRG joint, which could be amended and validated by test on the physical machine.The main content of this paper is as followed:(1) This paper has summarized the state of development that the studies on dynamic performance of machine tool joints and subject matter existing at present, introduced the key method of reach on the dynamic performance of joints, and brought a new way combined by theoretical calculation, dynamic test and FEA to research the performance of joints.(2) The author regards one LRG as the research object. By analyzing its structural trait, the theoretical dynamic model of LRG has been given. Then, the accurate finite element model LRG joint has been established.(3) The finite element model of single slide block experiment system including LRG joints had been established and finite element analysis had been done.(4) The above-mentioned theoretics and the accurate finite element model LRG joint apply to the full machine and progress detailed research. (5) The paper has researched for experiment project design and established relatively approach the practice machine tool of four slip block experiment system, The finite element model of one including LRG joints had been established and finite element analysis had been done. The dynamic performance of experiment system was obtained, which could be used as basic parameters in dynamic design. Contrasted this, the model without LRG joint had been also established. The large difference between the two FEA results of model can show the effect which the LRG joint act on the dynamic performance of machine tool.This paper presented a new way to research the dynamic performance of LRG joint. It can also be used on study of other kind of joint, which made the configuration of dynamic model of entire CNC machine tool be possible. The conclusion of this paper could be a gist for dynamic design of machine tool.

Powder mixed electrical discharge machining (EDM) technology is to add conductible silicon and aluminium powders to a certainly consistency into working fluid in order to change the discharge condition of EDM, and then decrease the surface roughness remarkably, improve the surface performance and leave out manual polish. And it is possible to take EDM as the final machining for the large area, exact and complicated moulding surface. The electrical discharge machine has been numerical, and the function of the machine tool is more perfect and the automatization is improved to a large extent with the development of numerical control. The mainframe system applied to powder mixed electrical discharge machine is assembly designed by researching the structure and performance of machine tools in existence, and excellent machining effect is obtained in practical machining.First, structural design of the mainframe system of powder mixed electrical discharge machine is done, and no-seam linkage between Pro/E and ANSYS software is used to do finite element analysis on some important parts such as the spindle head, the stand pole and the lathe bed. Illogical designs can be found out by the analysis, and it can instruct the structure design and improve unsubstantial parts. All of these are used to settle academic basis for optimum design of the machine and decreasing the manufacturing cost, and are good for developing advanced powder mixed electrical discharge machines.Second, the action mechanism of powder in powder mixed EDM is researched, and the mechanism of how the surface roughness is decreased by powder mixed EDM is analyzed. And then how the powder concentration and category affects the surface roughness is explained. The powder suspending mechanism is researched by analyzing the movement condition of powder grain. And the additive for increasing the suspension property of powder grain is researched by experiment and analyzing the physical and chemical property of it. The research provides a new way of developing the powder additive that can be widely used in practical machining. The effect of several important craft conditions on the quality of powder mixed EDM is analyzed particularly and synthetically, and some regular patterns are summed up. Machining parameters are optimized by theoretical analysis and technical experiments in order to be widely used in practical machining.In the end, the machining performance of the powder mixed electrical discharge machine designed is tested and used in practical machining, such as the machining of curved faces, hooker moulds of the textile machine, the titanium alloy material and discharge machining words with powder mixed EDM, and so on. The technical trait, application technique and operating skills are summed up at the same time. The application examples indicate that conclusions of the technique research are significant for instructing practical machining.