Researches on Temperature Control Strategy of SMHS-Type 3D Printing Based on Variable Universe Fuzzy Control

Author(s):  
Tao Wu ◽  
◽  
Yiru Tang ◽  
Dongdong Fei ◽  
Yongbo Li ◽  
...  

Selective micro heat sintering (SMHS)-type 3D printing technology is a widely applied method in rapid prototyping, which uses an electric heating component to sinter non-metallic powder. It requires precise control of the heating component’s energy and its sintering time. Temperature is one of the key factors that affect the forming quality of fused-type 3D printing technology. Aiming at the nonlinear and time-delay characteristics of temperature control in fused-type 3D printing, a fuzzy control method based on variable universe fuzzy control was studied. This fuzzy control method adopts a set of nonlinear expansion-contraction factors to make the variable universes change with the adaptive error, which can help acquire adaptive temperature adjustment in the rapid prototyping process control. The results of the simulation and experiment showed that the controlled temperature response was faster, the overshoot was smaller, and the stability was better compared to the conventional fuzzy proportion integration differentiation (PID) algorithm after the temperature reached the target temperature. The printed results indicated that the universe fuzzy PID control can effectively improve the accuracy of the workpiece shapes and that the density distribution of the workpiece is increased, which can help improve the forming quality.

2012 ◽  
Vol 468-471 ◽  
pp. 1123-1127
Author(s):  
Jin Ning Zhi ◽  
Jian Wei Yang ◽  
Jun Zhe Dong

In order to improve the dynamic performance of five-axis heavy vehicle, a variable universe fuzzy control method is proposed to optimize suspension parameters. Five-axis multi-body dynamic model including electro-hydraulic proportional valve was firstly established in software ADAMS/Car. The variable universe fuzzy controller based on fuzzy neural network was also designed in MATLAB/Simulink, and then the co-simulation was conducted. The dynamic characteristics of five-axis heavy vehicle are studied to verify the effect of suspension parameters optimized by variable universe fuzzy control method in the A, B and C-level random pavement and different speed conditions. Simulation results show that compared with passive suspension, the real-time optimization of variable fuzzy control based on FNN can improve the ride comfort and the dynamic load of tire. Under different driving conditions, ride comfort can be increased by about 25%-30%, and the dynamic load of tire generally decreases by 25%-35%. Therefore this method has a certain practicability and effectiveness.


Author(s):  
Tran Linh Khuong ◽  
Zhao Gang ◽  
Muhammad Farid ◽  
Rao Yu ◽  
Zhuang Zhi Sun ◽  
...  

Biomimetic robots borrow their structure, senses and behavior from animals, such as humans or insects, and plants. Biomimetic design is design ofa machine, a robot or a system in engineeringdomain thatmimics operational and/orbehavioral model of a biological system in nature. 3D printing technology has another name as rapid prototyping technology. Currently it is being developed fastly and widely and is applied in many fields like the jewelry, footwear, industrial design, architecture, engineering and construction, automotive, aerospace, dental and medical industry, education, geographic information system, civil engineering, guns. 3D printing technology is able to manufacture complicated, sophisticated details that the traditional processing method cannot manufacture. Therefore, 3D printing technology can be seen as an effective tool in biomimetic, which can accurately simulate most of the biological structure. Fused Deposition Modeling (FDM) is a technology of the typical rapid prototyping. The main content of the article is the focusing on tensile strength test of the ABS-Acrylonitrile Butadiene Styrene material after using Fused Deposition Modeling (FDM) technology, concretization after it’s printed by UP2! 3D printer. The article focuses on two basic features which are Tensile Strength and Determination of flexural properties.


Author(s):  
Nixin Cai ◽  
Ping Sun ◽  
Saihua Jiang

The development of IoTs and portable device have excited the relentless pursuit of self-power systems to solve the limitations of conventional power supply methods. As a novel energy conversion technology,...


2014 ◽  
Vol 555 ◽  
pp. 541-548 ◽  
Author(s):  
Jan Lipina ◽  
Václav Krys ◽  
Josef Sedlák

An increasing number of designs and subsequent production of parts created by the Rapid prototyping (RP) [1] technology led to a problem with the maximum workspace of the 3D printer. Due to this reason, it was necessary to work on the solution of joining the parts to overcome the limited workspace of the printer. This article is devoted to glue joints analysis of two parts made by RP technology. A great emphasis is given to the load capacity testing of the parts made this way. The measured values than may serve as a lead for the construction design of the outlined joints. The article builds on the knowledge gained during the previous testing of the screw connections of parts made by 3D printing technology [2].


2019 ◽  
Vol 56 (4) ◽  
pp. 825-830
Author(s):  
Gheorghe Sovaiala ◽  
Alexandru-Polifron Chirita ◽  
Sava Anghel ◽  
DragoȘ Manea

The article presents the process by which, with the help of 3D printing technology, the piston of the differential injection device was produced using ABS material. It was made with fused filament fabrication (FFF) technology, and the smoothing process was used to improve the surface quality. The piston is part of a complex equipment for underground fertilization of agricultural crops.


CONVERTER ◽  
2021 ◽  
pp. 79-85
Author(s):  
Guo Lin

3D printing technology is a rapid prototyping technology, which has been gradually applied in the mechanical automation manufacturing industry. 3D printing technology of mechanical parts is an important development direction of advanced mechanical automation manufacturing technology. At present, the research and development of SLM is a new hotspot in the field of rapid prototyping at home and abroad. The application of this technology can not only reduce the processing time, avoid the resource consumption caused by repeated adjustment of parameters, and make the mechanical manufacturing more accurate, more economical and more efficient. Based on this, this paper focuses on the application of 3D printing technology in mechanical manufacturing automation, and takes SLM as the research object, expounds the basic composition and forming principle of SLM. Based on the comparison of SLM technology at home and abroad, the future development direction of SLM technology is analyzed. At the same time, this paper designs SLM equipment with high efficiency, high cost performance, large range and traditional machining methods. The experimental results show that the 3D printing technology of metal parts is an important development direction of advanced mechanical automation manufacturing technology. The development direction of metal 3D printing in the future is to develop a portable and intelligent 3dslm device with high efficiency, high cost performance, high processing capacity and combination with traditional machining methods.


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