scholarly journals Моделирование переходных процессов в полупроводниковых приборах на основе 4H-SiC (учет неполной ионизации легирующих примесей в модуле ATLAS программного пакета SILVACO TCAD)

2019 ◽  
Vol 53 (3) ◽  
pp. 407
Author(s):  
П.А. Иванов ◽  
А.С. Потапов ◽  
Т.П. Самсонова
Keyword(s):  
Physical Model ◽  
Dynamic Characteristics ◽  
Computer Aided Design ◽  
Room Temperature ◽  
Software Module ◽  
Capacitive Element ◽  
Computer Aided ◽  
Simulation Results ◽  
Rc Circuit ◽  
Aided Design

AbstractTransient process in a resistor–capacitor (RC) circuit with a reverse-biased 4 H -SiC p – n diode as the capacitive element is simulated. Simulation is performed with the ATLAS software module from the SILVACO TCAD system for technology computer-aided design (TCAD). An alternative way, to that in ATLAS, to set the parameters of doping impurities partly ionized in 4 H -SiC at room temperature is suggested. (The INCOMPLETE physical model available in the ATLAS module, which describes the incomplete ionization of doping impurities in semiconductors, is unsuitable for simulating the dynamic characteristics of devices.) The simulation results are discussed in relation to previously obtained experimental results.

Simultaneous Computer-Aided Design of Rotational Plastic Parts

1993 ◽  
Author(s):  
Colin Chong ◽  
Kiyoshi Sogabe ◽  
Kosuke Ishii
Keyword(s):  
Injection Molding ◽  
Dynamic Characteristics ◽  
Computer Aided Design ◽  
Critical Speed ◽  
Dynamic Balance ◽  
Cad System ◽  
Compatibility Analysis ◽  
Computer Aided ◽  
Plastic Parts ◽  
Aided Design

Abstract This paper addresses the problem of balancing rotational plastic parts during the early stages of design. The study develops an interactive methodology that uses a solid modeling CAD system and considers injection molding concerns simultaneously with static and dynamic balance. The Transfer Matrix Method evaluates the dynamic characteristics by predicting the approximate critical speed of the part. Design Compatibility Analysis (DCA) checks for injection molding guidelines. Using these evaluation modules interactively, designers can develop a functional and manufacturable part quickly.

Impact of Pulse Quenching Effect on Sensitive Area at Advanced Technologies

2013 ◽  
Vol 392 ◽  
pp. 693-696
Author(s):  
Wen Tao Xu ◽  
Yang Guo ◽  
Yan Kang Du
Keyword(s):  
Computer Aided Design ◽  
Three Dimensional ◽  
Sensitive Area ◽  
Isolation Technique ◽  
Quenching Effect ◽  
Advanced Technologies ◽  
Computer Aided ◽  
Simulation Results ◽  
Aided Design ◽  
The Impact

The impact of pulse quenching effect on the sensitive area is evaluated by using three-dimensional technology computer-aided design (TCAD) numerical simulation. Simulation results present that the pulse quenching effect could effectively reduce the sensitive area of PMOS transistors. By adopting the off-state gate isolation technique, the sensitive area is further reduced.

Computer Aided Design of Feeders for Castings

1994 ◽  
Vol 208 (4) ◽  
pp. 279-287 ◽  
Author(s):  
H G Zhang ◽  
P D Webster ◽  
T A Dean
Keyword(s):  
Hot Spots ◽  
Computer Aided Design ◽  
Software Module ◽  
Casting Condition ◽  
Design Rules ◽  
Feeder Head ◽  
Computer Aided ◽  
Different Shapes ◽  
Aided Design ◽  
Feeding Systems

This paper describes a software module, contained within a design-for-casting package, which aids the user in designing efficient feeding systems for castings. The user can choose a shape suitable for a particular casting condition from a file containing a variety of feeder head types. The feeder heads are placed relative to the casting in positions appropriate to hot spots identified by a ‘heat centre’ module within the package. The number and size of heads are chosen with the aid of built-in rules that aid the user. The module provides a rationale for people, both skilled and unskilled, who have to design for casting. The validity of the design rules and guidelines within the module is demonstrated by casting three widely different shapes with and without feeders.

scholarly journals Investigation on the Hump Behavior of Gate-Normal Nanowire Tunnel Field-Effect Transistors (NWTFETs)

2020 ◽  
Vol 10 (24) ◽  
pp. 8880
Author(s):  
Min Woo Kang ◽  
Woo Young Choi
Keyword(s):  
Computer Aided Design ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Three Dimensional ◽  
Gate Insulator ◽  
Radius Of Curvature ◽  
Computer Aided ◽  
Simulation Results ◽  
Tcad Simulation ◽  
Aided Design

The hump behavior of gate-normal nanowire tunnel field-effect transistors (NWTFETs) is investigated by using a three-dimensional technology computer-aided design (TCAD) simulation. The simulation results show that the hump behavior degrades the subthreshold swing (SS) and on-current (Ion) because the corners and sides of nanowires (NWs) have different surface potentials. The hump behavior can be successfully suppressed by increasing the radius of curvature (R) of NWs and reducing gate insulator thickness (Tins).

Performance atlases of the workspace for planar 3-DOF parallel manipulators

Robotica ◽  
2000 ◽  
Vol 18 (5) ◽  
pp. 563-568 ◽  
Author(s):  
Xin-Jun Liu ◽  
Jinsong Wang ◽  
Feng Gao
Keyword(s):  
Physical Model ◽  
Optimum Design ◽  
Computer Aided Design ◽  
Solution Space ◽  
Parallel Manipulators ◽  
Performance Characteristics ◽  
Performance Criteria ◽  
Computer Aided ◽  
Aided Design

The design of the robotic mechanisms is most important because they determine the performance characteristics of the robots. This paper concerns the issue of computer-aided design (CAD) for planar 3-DOF parallel robotic mechanisms by means of the physical model of the solution space, which can be used systematically to express the relationships between the performance criteria and all link lengths of one type of the robtic mechanism. The performance atlases of the workspace volume for the manipulators are plotted in the physical model of the solution space. The characteristics of the distribution of the workspace shapes in the physical model of the solution space are presented. The results are useful for the optimum design of the robotic mechanisms. This paper proposes a new way for robotic CAD.

Workspace atlases for the computer aided design of the Delta robot

2003 ◽  
Vol 217 (8) ◽  
pp. 861-869 ◽  
Author(s):  
X-J Liu ◽  
J Wang ◽  
H Zheng
Keyword(s):  
Physical Model ◽  
Optimum Design ◽  
Computer Aided Design ◽  
Solution Space ◽  
Parallel Robots ◽  
New Method ◽  
Performance Criteria ◽  
Computer Aided ◽  
Aided Design

Parallel robots lead to complex kinematics equations, so determination of their workspaces is a challenging issue. The workspace of a robot is not fully characterized by its volume alone; the workspace shape is an important aspect as well. In this paper, the geometric determination of the workspace for Delta robots is presented. The workspace (workspace volume and workspace shape) for the robots is studied systematically in ‘the physical model of the solution space’, which is a useful tool to express relationships between the performance criteria and all link lengths of one type of robotic mechanism. Performance atlases of the workspace volume for the robots are plotted in the physical model of the solution space. The characteristics of the distribution of the workspace shapes in the physical model of the solution space are presented as well. The physical model of the solution space presents a new method for the computer aided design (CAD) of robotic mechanisms. The results are very useful for obtaining the optimum design of robotic mechanisms.

Design and Analysis on Symmetric MEMS Inductor

2015 ◽  
Vol 815 ◽  
pp. 364-368
Author(s):  
N. Khalid ◽  
N.I.M. Nor ◽  
W.M.W. Norhaimi ◽  
Zaliman Sauli ◽  
Vithyacharan Retnasamy
Keyword(s):  
Modeling And Simulation ◽  
Mechanical System ◽  
Computer Aided Design ◽  
Micro Electro Mechanical System ◽  
Q Factor ◽  
High Q ◽  
Computer Aided ◽  
Simulation Results ◽  
Conductor Strip ◽  
Aided Design

This paper presents the design and analysis of new proposed topology micro-electro-mechanical system (MEMS) inductor. This new symmetric MEMS inductor is designed to reduce the total length of the conductor strip and hence reduce the resistance of the metal tracks. This results significant increases in the quality (Q) factor of the inductor. In this paper, the MEMS inductor is designed using CoventorWare®, which is powerful software for MEMS computer aided design (CAD), modeling and simulation. Results indicate that new symmetric inductor topology has thehighest Q-factor and it hasbeenimproved bytwo times compared to circular inductor. The analysis revealed that area of the symmetric inductor has reduced by37.5% compared to the circular inductor. Result has proved that the reduction of length of the conductor strip has reduced the resistance of the metal tracks and results in a high Q-factor inductor.

Computer-Aided Design and Engineering for M16 Handguard Manufacturing

2017 ◽  
Vol 728 ◽  
pp. 422-427
Author(s):  
Supakanya Petcharawan ◽  
Nuttaphong Sornsuwit ◽  
Wanlop Harnnarongchai
Keyword(s):  
Finite Element Analysis ◽  
Stress Concentration ◽  
Computer Aided Design ◽  
Weld Line ◽  
Element Analysis ◽  
Design And Optimization ◽  
Computer Aided ◽  
Flash Technique ◽  
Simulation Results ◽  
Aided Design

This work presents a computer-aided design and engineering CAD/CAE for design and optimization of M16 handguard manufacturing. A new design of handguard was developed in term of various combinations of supporting ribs inside the component. Finite Element Analysis (FEA) was used to simulate the stress distribution as well as the evaluation of supporting ribs in the component. The injection molding was used for production of the hand guard; therefore, the CAE was used to simulate the effect of gate location and gate type on the weld lines. The excessive-flash technique, which extends the fill time and continues the melt lines to flow after the melt recombination, has been introduced in order to reduce the weld lines. The simulation results indicated that the stress concentration in the loading and vent holes regions had the potential to cause the handguard to fracture. However, the combinations of vertical and horizontal ribs can reduce the stress concentration in the component. The weld lines located near the vent hole, in which the melt fronts came in contact with each other. The type and location of gates did not affect the weld line while the weld lines were observed to be strongly influenced by the excessive flash.

A Novel Robotic Tree Climbing Mechanism With Anti-Falling Functionality for Tree Pruning

2017 ◽  
Vol 10 (1) ◽  
Author(s):  
Pengfei Gui ◽  
Liqiong Tang ◽  
Subhas Mukhopadhyay
Keyword(s):  
Physical Model ◽  
Kinematic Analysis ◽  
Computer Aided Design ◽  
Research Work ◽  
Robotic System ◽  
Tree Trunk ◽  
Computer Aided ◽  
Cad Models ◽  
Aided Design ◽  
Tree Pruning

This paper presents a novel mechanism of tree climbing robotic system for tree pruning. The unique features of this system include the passive and active anti-falling mechanisms, which prevent the robot from falling to the ground under either static or dynamic situations, the capability to vertically or spirally climb up a tree trunk, and the flexibility to suit different trunk sizes. The computer-aided design (CAD) models of the robotic mechanism, static and kinematic analysis, climbing simulation, and testing of the physical model are stated in detail. This research work reveals that this novel tree climbing mechanism can be served as a platform for tree pruning robot.

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