A CAD/CAE System for Structures of Dockside Container Cranes

2006 ◽  
Author(s):  
Chonghua Wang ◽  
Hua Li
Keyword(s):  
Integration Method ◽  
Parametric Model ◽  
Complex Structures ◽  
Element Analysis ◽  
Container Cranes ◽  
Fea Model ◽  
The Finite Element Analysis ◽  
Cad Cam ◽  
Cae System ◽  
Model Family

Dockside container cranes have huge complex structures which have various kinds of types and lots of parameters for design. Moreover the finite element analysis must be carried out on the structures. An integrated CAD/CAM system for crane’s structures is introduced in this paper. A CAD platform of 3D parametric model family is built to allow generation of feasible configurations of crane products. Using Visual C++ and the second exploiting software kit, an integration method of CAD/CAE which includes regeneration of 3D parametric model, synchronous updating and analysis of FEA model is achieved.

scholarly journals Design and Modeling of a Bio-Inspired Flexible Joint Actuator

Actuators ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 95
Author(s):  
Ming Xu ◽  
Cheng Rong ◽  
Long He
Keyword(s):  
Hydraulic System ◽  
Driving Forces ◽  
Theoretical Models ◽  
Element Analysis ◽  
Flexible Joint ◽  
Fea Model ◽  
The Finite Element Analysis ◽  
Series Of Experiments ◽  
The Mathematical Model ◽  
Moving Speed

Spiders rely on a hydraulic system to stretch their legs but use muscles to make their legs flex. The compound drive of hydraulics and muscle makes an integrate dexterous structure with powerful locomotion abilities, which perfectly meets the primary requirements of advanced robots. Inspired by this hydraulics-muscle co-drive joint, a novel flexible joint actuator was proposed and its driving characteristics were preliminarily explored. The bio-inspired flexible joint manifested as a double-constrained balloon actuator, which was fabricated by the composite process of 3D printing and casting. To evaluate its performance, the mathematical model was deduced, as well as the finite element analysis (FEA) model. A series of experiments on the rotation angles, driving forces, and efficiencies of the flexible joint were carried out and compared with the mathematical calculations and FEA simulations. The results show that the accuracy of the two theoretical models can be used to assess the joint actuator. The locomotion test of a soft arthropod robot with two flexible joints was also implemented, where the moving speed reached 22 mm/s and the feasibility of the proposed flexible joint applied to a soft robot was demonstrated.

Performance of Depressurization Devices to Dynamic Loads Generated by Arcing in Liquid Filled Transformers

2018 ◽  
Author(s):  
Ashwin Padmanaban Iyer ◽  
Anne Goj ◽  
Omar K. Ahmed
Keyword(s):  
Pressure Wave ◽  
Dynamic Performance ◽  
Sine Wave ◽  
Evaluation Methodology ◽  
Element Analysis ◽  
Loading Rates ◽  
Fea Model ◽  
The Finite Element Analysis ◽  
Rupture Disk ◽  
Dielectric Insulation

This study provides a methodology that can be used to evaluate the dynamic performance of fast depressurization devices used in liquid-filled oil transformers. Liquid-filled transformers are susceptible to explosions due to internal arcing if the dielectric insulation fails. The internal arc vaporizes a portion of the liquid and generates a sudden pressure wave. The first peak of the pressure wave has been measured to be as high as 13 bars, with time durations on the order of milliseconds [1]. Transformer tanks have a typical static withstand limit of approximately 1 bar gauge [2]. It is thus imperative that the tank be depressurized before the static pressure reaches such a threshold. One industry-accepted Fast Depressurization System [3] used to depressurize transformers after an internal arc is based on a patented rupture disk design [4]. This study compares the dynamic performance of this disk to results from a successful test campaign using a rupture disk as the depressurization device. Limiting loading rate values from the test campaign are then used to comment on the effectiveness of the design. The evaluation methodology is based on Pressure-Impulse (P-I) curves. The P-I curve was generated by running a series of Implicit Dynamic analysis using Code_Aster [5]. This iterative process first required establishing a failure mode that is consistent with actual observed failure in the field and observable in the Finite Element Analysis (FEA) model. The criteria were then used in interpreting the response of the Rupture Disk to a series of different half-sine wave pulse loading of varying amplitudes and time-periods. The generated P-I curve was then compared to loading rates observed in the test campaign [1] as well as three other higher loading rates (1.28 times, 2 times, 3.8 times, and 10.25 times the reported experimental rate) to qualitatively assess the effectiveness of the design. Results indicated that disk functions extremely effectively as a Fast Depressurization System as also corroborated by the test campaign. Although this methodology is used for the rupture disk, it is expected that this methodology can be extended to compare the dynamic performance of other depressurization devices.

scholarly journals Damage Identification of Continuous Rigid Frame Concrete Bridge

2014 ◽  
Vol 8 (1) ◽  
pp. 193-200
Author(s):  
Shengnan Huang ◽  
Lieping Ye ◽  
Xinzheng Lu
Keyword(s):  
Damage Accumulation ◽  
Damage Identification ◽  
Concrete Bridge ◽  
Element Analysis ◽  
Fea Model ◽  
Rigid Frame ◽  
The Finite Element Analysis ◽  
Mode Method ◽  
Different Levels

During a bridge service life, many factors can cause damage accumulation such as overloaded traffic, fatigue effect, and so on. Hence, the identification of potential damages has been received wide attention to prevent such sudden fatal accident. An experiment of a continuous rigid frame concrete bridge, which had 3 spans and a total length of 18 meters, was presented in this paper. Two load stages and ten different load steps were simulated to test various scenario of long-term loading and different levels of overload. Curvature mode method was adopted to detect the damage during the exercises. The changes of curvature modes were used to detect damage after the ten load steps. This method performed excellent to identify the damage position of the bridge. So, it is concluded that the curvature modes can be used to detect damage in actual structures. In addition, the Finite-Element Analysis (FEA) was utilized, and the experimental recurring was verified positively through FEA model.

Towards a Symbolic Math CAD/CAM System

1993 ◽  
Author(s):  
Tom Trias ◽  
Myo Kyaw ◽  
Darren Thompson ◽  
Laurence Leff ◽  
Z. Malik
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Engineering Design ◽  
Constructive Solid Geometry ◽  
Regular Grid ◽  
Element Analysis ◽  
Solid Geometry ◽  
The Finite Element Analysis ◽  
Cad Cam ◽  
Analysis System

Abstract We have written two pieces of software that are necessary for mechanical engineering design and analysis. These are a CAD-CAM system using Constructive Solid Geometry and a finite element analysis system. Both are unique in that they are written in the symbolic math system MAPLE. All entities in each of these programs are entered symbolically. For example, in the CSG system, we talk about a square whose dimensions are a, b and side1. In the finite element analysis, we talk about a symbolic representation for a regular grid. This scheme has advantages over conventional finite element analysis and Constructive Solid Geometry approaches.

Research on Simulation of Cutting Process Based on the Finite Element Analysis Method

2013 ◽  
Vol 631-632 ◽  
pp. 686-690
Author(s):  
Yi Li Shen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
New Technologies ◽  
Cutting Process ◽  
Analysis Method ◽  
Organizational Models ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
The Finite Element Analysis ◽  
Cad Cam

With the rapid penetration of information technology in various fields, CAD/CAM/CAE technology has been widely used to fundamentally change the traditional design, production, organizational models, it also has a very important significance to promote the technological transformation of existing enterprises, bring the whole structural change of the night, develop the new technologies and the promotion of economic growth. The paper uses the blades of steam turbine as an example, combined with the finite element analysis method to study the whole cutting process, the whole process was simulated and the results of error were had analysis and optimization.

Study on Parametric Modeling Method for FEA Model of Periodic Symmetric Struts Support

2011 ◽  
Vol 462-463 ◽  
pp. 990-995
Author(s):  
Zhen Shi Li ◽  
Mamtimin Gheni ◽  
Lie Yu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Programming Language ◽  
Necessary Conditions ◽  
Parametric Modeling ◽  
Ansys Software ◽  
Element Analysis ◽  
Fea Model ◽  
The Finite Element Analysis ◽  
The Relationship

In this paper, the APDL programming language provided by ANSYS software is used to build the parametric modeling of Periodic Symmetric Struts Support (PSSS), which is provide convenience and necessary preparations for the Finite Element Analysis (FEA) and save much time and effort during the preprocess analysis. At first, the positional parameters and size parameters of PSSS are analyzed, and find out the relationship between main parameters, and identify the parameter equations. Then, build the struts support model and edit the parameter equations by APDL language. Finally, the producing process of different kind of struts support models are implemented by changing main parameters and provide the necessary conditions for preprocess of FEA.

Mathematical Modeling of Seat and Occupant Interaction in Rear Impact

2000 ◽  
Author(s):  
Li Chai ◽  
Saeed D. Barbat
Keyword(s):  
Technology Development ◽  
Head Acceleration ◽  
Element Analysis ◽  
Rear Impact ◽  
Fea Model ◽  
Safety Technology ◽  
The Finite Element Analysis ◽  
Model Predictions ◽  
Design For Safety ◽  
Occupant Injuries

Abstract Automobile occupant injuries related to rear-end collisions have become the most expensive insurance claims even though fatality rate is relatively low compared to other types of injuries. The concept of designing seats for safety has caught the attention of researchers in recent years. The finite element analysis (FEA) technique has been used as an efficient tool in vehicle safety technology development, but limited work has been reported in its application to seat design for safety. In this paper, a seat/dummy FEA model is developed and presented. The seat geometry is accurately generated from CAD data. The material properties of the seat foams are derived from tests. The seat/dummy model is validated against sled tests in 16 kph and 40 kph rear impact modes. The predicted dummy responses in terms of head acceleration, neck forces and moments, chest acceleration, lumbar spine force and moment, and pelvis acceleration are discussed. Model predictions are favorably correlated with tests. Therefore, this model can be deemed as ready for rear impact studies.

Investigation of ballistic performance on 3D compound structure fabric by finite element analysis

2022 ◽  
pp. 004051752110600
Author(s):  
Dan Yang ◽  
Qingsong Wei ◽  
Xiaogang Chen ◽  
Jinchun Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Curved Surface ◽  
Compound Structure ◽  
Technical Issue ◽  
Ballistic Performance ◽  
Element Analysis ◽  
Fea Model ◽  
The Finite Element Analysis ◽  
Ballistic Test

Ballistic performance and moldability are two important properties for 3D curved-surface ballistic applications. However, these two properties are contradictory to each other and impossible to improve at the same time, which is a technical issue that needs to be solved urgently in the research for ballistic materials for 3D curved-surface ballistic applications. In order to solve this issue, a new 3D compound structure fabric has been developed as part of our former research and has been shown to provide better ballistic performance with equivalent moldability compared to 3D angle-interlock fabric—a well-known 3D material for 3D curved-surface ballistic applications. Nevertheless, the ballistic performance of this new fabric itself is not clear, and further research is necessary. In this study, the ballistic performance of this new 3D compound structure fabric was investigated via the finite element analysis (FEA) model to examine energy absorption and penetration resistance. A ballistic test was also carried out to verify the results of the FEA model, and this demonstrated that the theoretical model was consistent with the experimental results.

Matching Relationship between Frequency Characteristic and Parasitic Error of Compliant Linear Buffer Mechanism

2010 ◽  
Vol 29-32 ◽  
pp. 1181-1187 ◽  
Author(s):  
Qing Kun Zhou ◽  
Ya Fei Lu ◽  
Da Peng Fan ◽  
Zhi Yong Zhang ◽  
Lian Chao Zhang
Keyword(s):  
Frequency Characteristic ◽  
Compliant Mechanisms ◽  
Compliant Mechanism ◽  
The Novel ◽  
Element Analysis ◽  
Fea Model ◽  
Polynomial Curve ◽  
The Finite Element Analysis ◽  
Polynomial Curve Fitting ◽  
The Relationship

A novel compliant linear buffer mechanism (CLBM) is designed for impact isolation. In view of the incompatible relationship between frequency characteristic and parasitic error of compliant linear mechanism, the mixed compliant linear mechanism(MCLM) is proposed by combining the Lumped Compliant Mechanism(LCM) and the Distributed Compliant Mechanism(DCM).The topology matrices for four kinds of parallelogram linear compliant mechanisms are built through the method of type synthesis. The characteristic polynominal (CP) for the compliant mechanism matrices[CM] are calculated for the isomorphism detection of compliant mechanism. The finite element analysis (FEA) model of these four kinds of linear compliant mechanism is built to complete numerical analysis on the structure frequency and parasitic error with different sizes, and the relationship between the frequency characteristic and parasitic error of the compliant linear mechanism is found out. MatlabTM software is used to obtain the functional formulas by the method of polynomial curve fitting (PCF) for The FEA results show that the structure configuration of MCLM can achieve a higher structure frequency and a greater kinetic precision over the pure LCM and DCM at the same time, and also indicates that the analysis method of frequency characteristic and parasitic error for compliant mechanism is efficient and should be effective on the structure optimization of the novel CLBM.

Design and Analysis of Automatic Ballot Box Based on SolidWorks Motion

2013 ◽  
Vol 703 ◽  
pp. 340-344
Author(s):  
Xian Hu Wang ◽  
Yu Cheng ◽  
Jing Nan Zhang
Keyword(s):  
Finite Element Analysis ◽  
Economic Benefits ◽  
Feature Modeling ◽  
Element Analysis ◽  
Assembly Design ◽  
The Finite Element Analysis ◽  
Cad Cam ◽  
Design Idea ◽  
Implementation Method ◽  
Cae Technology

This article analyzed the design idea and implementation method for the structure of the automatic ballot box. It constructed the model of parts and assembly design of the ballot box based on the powerful feature modeling function of SolidWorks and finally worked out the finite element analysis on key parts. It thus successfully developed the automatic ballot box. It improved the enterprise's ability of independent development, obtained better economic benefits, and was the good application of CAD/CAM/CAE technology.

Sign in / Sign up

Export Citation Format

Share Document