Crushing roller is one of the main parts of High-p re ssure Grinding Roller, which is a kind of high efficient ore crushing equipment. A kind of assembled roller, which is more convenient to renovate worn surface b y ...Crushing roller is one of the main parts of High-p re ssure Grinding Roller, which is a kind of high efficient ore crushing equipment. A kind of assembled roller, which is more convenient to renovate worn surface b y simply replacing segmented surface of the roller, was developed. The structura l models of assembled roller’s components were designed with SolidWorks softwar e based on feature modeling, these solid models of the roller were virtually ass embled. Through this work, not only was the assemble interference checked out so as to examine validity of the structure design, but also these solid models cou ld be recognized by COSMOS/Works software, through which the finite element an alysis can be done. Then the stress and displacement of the main shaft and sur face segment in two different working states were analyzed and detected quickly according to the analysis results with COSMOS/Works. In conclusion, the optimum clearance of 1.0～2.0 mm between concave-convex studded segments is determined to make the using life of assembled roller longer.展开更多
According to the technique requests of the brake caliper in the process of production, a special fixture of float brake caliper has been developed based on 3 D design in this paper. The development process and verifie...According to the technique requests of the brake caliper in the process of production, a special fixture of float brake caliper has been developed based on 3 D design in this paper. The development process and verified data from 3D modeling and kinematics simulation for this special fixture show that this 3D-designed process can conveniently forecast the assembly interference of the fixture and accurately add the mass of lead brick before the prototype is made. In this way the flutter caused by the unbalanced lathe fixture can be eliminated and the precision of run-out tolerance in cylinder hole compared with machine tool spindle can be improved, thus the processing quality of the cylinder hole in a brake caliper can be greatly guaranteed.展开更多
Objectives:3D design,which is widely used in orthopedics,can be applied for precise distal femoral megaprosthetic revision.This research aimed to present and evaluate the design,perioperative management,and midterm cl...Objectives:3D design,which is widely used in orthopedics,can be applied for precise distal femoral megaprosthetic revision.This research aimed to present and evaluate the design,perioperative management,and midterm clinical outcomes of a 3D design custom-made uncemented prosthetic stem.Methods:Between January 2014 and January 2016,seven patients received 3D design custom-made uncemented prosthetic stem revision at our institution.Clinical records and radiographs were evaluated retrospectively.Results:There were no hardware-related complications during the follow-up(average 24.3 months;range 24–48 months).The average Musculoskeletal Tumor Society(MSTS)score at the last follow-up after revision(27.7 points,range 25–28 points)was significantly higher than that before(16.0 points,range 13–18 points).In addition,the range of motion(ROM)of the affected knee,and the scores of pain,function,emotional acceptance,support,walking and gait all improved significantly.The antecurvature radian of the revision stem averaged at 3.6°.Of the seven patients,three received femoral stem revision and four received revision of the femoral stem and the femoral component;three of them used longer prostheses than the others.There were no significant differences in function between these two groups at the last follow-up after revision.Conclusion:The 3D design custom-made prosthesis is a typical precision medicine technology in oncologic orthopedics.Characterized by its individually and precisely designed uncemented stem,it offers an alternative option for distal femoral cemented prosthesis revision.Besides the 3D design itself,the perioperative management,especially the techniques for stem implantation,and long-term follow-up are also crucial.展开更多
This article addresses the challenges associatedwith three-dimensional(3D)design models in the power industry,such as substantial data volume and complex calculations.Traditional data exchange methods pose difficultie...This article addresses the challenges associatedwith three-dimensional(3D)design models in the power industry,such as substantial data volume and complex calculations.Traditional data exchange methods pose difficulties in coordinating design efforts among project participants,and current computing systems cannot meet the performance demands of 3D power design.To overcome these challenges,this study thoroughly evaluates both public and private clouds and ultimately selects a hybrid cloud infrastructure for a custom-built 3D design platform that addresses the specific needs of the power industry.Employing optimization algorithms for 3D design models,we reduce model size and implement automated synchronization of platform data through code.We also propose different levels of cloud services and identify the necessary functionalities to be fulfilled by each layer of the 3D design cloud platform.Nested virtualization technology is used to create cloud desktops with different hardware requirements.Ultimately,we successfully establish a comprehensive framework for a 3D design platform specifically tailored to power design enterprises.展开更多
The 3D inverse design method, which methodology is far superior to the conventional design method that based on geometrical description, is gradually applied in pump blade design. However, no complete description abou...The 3D inverse design method, which methodology is far superior to the conventional design method that based on geometrical description, is gradually applied in pump blade design. However, no complete description about the method is outlined. Also, there are no general rules available to set the two important input parameters, blade loading distribution and stacking condition. In this sense, the basic theory and the mechanism why the design method can suppress the formation of secondary flow are summarized. And also, several typical pump design cases with different specific speeds ranging from centrifugal pump to axial pump are surveyed. The results indicates that, for centrifugal pump and mixed pump or turbine, the ratio of blade loading on the hub to that on the shroud is more than unit in the fore part of the blade, whereas in the aft part, the ratio is decreased to satisfy the same wrap angle for hub and shroud. And the choice of blade loading type depends on the balancing of efficiency and cavitation. If the cavitation is more weighted, the better choice is aft-loaded, otherwise, the fore-loaded or mid-loaded is preferable to improve the efficiency. The stacking condition, which is an auxiliary to suppress the secondary flow, can have great effect on the jet-wake outflow and the operation range for pump. Ultimately, how to link the design method to modem optimization techniques is illustrated. With the know-how design methodology and the know-how systematic optimization approach, the application of optimization design is promising for engineering. This paper summarizes the 3D inverse design method systematically.展开更多
文摘Crushing roller is one of the main parts of High-p re ssure Grinding Roller, which is a kind of high efficient ore crushing equipment. A kind of assembled roller, which is more convenient to renovate worn surface b y simply replacing segmented surface of the roller, was developed. The structura l models of assembled roller’s components were designed with SolidWorks softwar e based on feature modeling, these solid models of the roller were virtually ass embled. Through this work, not only was the assemble interference checked out so as to examine validity of the structure design, but also these solid models cou ld be recognized by COSMOS/Works software, through which the finite element an alysis can be done. Then the stress and displacement of the main shaft and sur face segment in two different working states were analyzed and detected quickly according to the analysis results with COSMOS/Works. In conclusion, the optimum clearance of 1.0～2.0 mm between concave-convex studded segments is determined to make the using life of assembled roller longer.
文摘According to the technique requests of the brake caliper in the process of production, a special fixture of float brake caliper has been developed based on 3 D design in this paper. The development process and verified data from 3D modeling and kinematics simulation for this special fixture show that this 3D-designed process can conveniently forecast the assembly interference of the fixture and accurately add the mass of lead brick before the prototype is made. In this way the flutter caused by the unbalanced lathe fixture can be eliminated and the precision of run-out tolerance in cylinder hole compared with machine tool spindle can be improved, thus the processing quality of the cylinder hole in a brake caliper can be greatly guaranteed.
基金supported,in part,by the National Natural Science Foundation of China(81702664).
文摘Objectives:3D design,which is widely used in orthopedics,can be applied for precise distal femoral megaprosthetic revision.This research aimed to present and evaluate the design,perioperative management,and midterm clinical outcomes of a 3D design custom-made uncemented prosthetic stem.Methods:Between January 2014 and January 2016,seven patients received 3D design custom-made uncemented prosthetic stem revision at our institution.Clinical records and radiographs were evaluated retrospectively.Results:There were no hardware-related complications during the follow-up(average 24.3 months;range 24–48 months).The average Musculoskeletal Tumor Society(MSTS)score at the last follow-up after revision(27.7 points,range 25–28 points)was significantly higher than that before(16.0 points,range 13–18 points).In addition,the range of motion(ROM)of the affected knee,and the scores of pain,function,emotional acceptance,support,walking and gait all improved significantly.The antecurvature radian of the revision stem averaged at 3.6°.Of the seven patients,three received femoral stem revision and four received revision of the femoral stem and the femoral component;three of them used longer prostheses than the others.There were no significant differences in function between these two groups at the last follow-up after revision.Conclusion:The 3D design custom-made prosthesis is a typical precision medicine technology in oncologic orthopedics.Characterized by its individually and precisely designed uncemented stem,it offers an alternative option for distal femoral cemented prosthesis revision.Besides the 3D design itself,the perioperative management,especially the techniques for stem implantation,and long-term follow-up are also crucial.
基金supported by the Innovation Project of China Energy EngineeringGroup Co.,Ltd.-Electrical 3DDesign Software for Substations(Converter Stations).
文摘This article addresses the challenges associatedwith three-dimensional(3D)design models in the power industry,such as substantial data volume and complex calculations.Traditional data exchange methods pose difficulties in coordinating design efforts among project participants,and current computing systems cannot meet the performance demands of 3D power design.To overcome these challenges,this study thoroughly evaluates both public and private clouds and ultimately selects a hybrid cloud infrastructure for a custom-built 3D design platform that addresses the specific needs of the power industry.Employing optimization algorithms for 3D design models,we reduce model size and implement automated synchronization of platform data through code.We also propose different levels of cloud services and identify the necessary functionalities to be fulfilled by each layer of the 3D design cloud platform.Nested virtualization technology is used to create cloud desktops with different hardware requirements.Ultimately,we successfully establish a comprehensive framework for a 3D design platform specifically tailored to power design enterprises.
基金Supported by National Basic Research Program of China(973 Program,Grant No.2009CB724302)
文摘The 3D inverse design method, which methodology is far superior to the conventional design method that based on geometrical description, is gradually applied in pump blade design. However, no complete description about the method is outlined. Also, there are no general rules available to set the two important input parameters, blade loading distribution and stacking condition. In this sense, the basic theory and the mechanism why the design method can suppress the formation of secondary flow are summarized. And also, several typical pump design cases with different specific speeds ranging from centrifugal pump to axial pump are surveyed. The results indicates that, for centrifugal pump and mixed pump or turbine, the ratio of blade loading on the hub to that on the shroud is more than unit in the fore part of the blade, whereas in the aft part, the ratio is decreased to satisfy the same wrap angle for hub and shroud. And the choice of blade loading type depends on the balancing of efficiency and cavitation. If the cavitation is more weighted, the better choice is aft-loaded, otherwise, the fore-loaded or mid-loaded is preferable to improve the efficiency. The stacking condition, which is an auxiliary to suppress the secondary flow, can have great effect on the jet-wake outflow and the operation range for pump. Ultimately, how to link the design method to modem optimization techniques is illustrated. With the know-how design methodology and the know-how systematic optimization approach, the application of optimization design is promising for engineering. This paper summarizes the 3D inverse design method systematically.
