scholarly journals Modeling and Analysis of Truck Mounted Concrete Pump Boom by Virtual Prototyping

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Wu Ren ◽  
Zhongwei Li ◽  
Yanping Bi ◽  
Shan Zhao ◽  
Bo Peng ◽  
...  
Keyword(s):  
Rigid Body ◽  
Simulation Model ◽  
Working Conditions ◽  
Virtual Prototyping ◽  
Hydraulic Cylinder ◽  
Modeling And Analysis ◽  
Engineering Software ◽  
Horizontal Condition ◽  
Rigid Body Simulation ◽  
Concrete Pump

By far there is lack of research on different working conditions between rigid and flexible dynamics of truck mounted concrete pump booms. First a 3D model has been established by using virtual prototyping technology of a 37 m long boom in Pro/Engineering software. Then the rigid body simulation model has been built. Next modal superimposition method is adopted to change the 4 rigid body booms into flexible ones. Kinematics law and dynamic characteristics of 4 common working conditions had been studied then. Next tip displacement and the first boom hydraulic cylinder force of the 4 working conditions between rigid and flexible models have been researched. Furthermore the first natural frequencies of the structure have been calculated. The results show that the frequency of the horizontal condition has the lowest of all and the roof condition has the largest of all. Besides the cylinder forces of the flexible model are larger than the corresponding rigid ones because of the flexible boom vibration. Finally an experiment has been done on a boom test rig which proved that the established simulation model is reasonable and the frequency results are correct. All of these provide design reference to mechanical manipulator as well as reducing product development cost of such mechanism.

Fault Detection for an Aileron Actuator under Variable Conditions Based on Bi-Step Neural Network

2015 ◽  
Vol 764-765 ◽  
pp. 740-746
Author(s):  
Hang Yuan ◽  
Chen Lu ◽  
Ze Tao Xiong ◽  
Hong Mei Liu
Keyword(s):  
Neural Network ◽  
Fault Detection ◽  
Simulation Model ◽  
Working Conditions ◽  
Detection Method ◽  
Fault Tolerant ◽  
Adaptive Threshold ◽  
Residual Error ◽  
The Other ◽  
Aerodynamic Loads

Fault detection for aileron actuators mainly involves the enhancement of reliability and fault tolerant capability. Considering the complexity of the working conditions of aileron actuators, a fault detection method for an aileron actuator under variable conditions is proposed in this study. A bi-step neural network is utilized for fault detection. The first neural network, which is employed as the observer, is established to monitor the aileron actuator and generate the residual error. The other neural network generates the corresponding adaptive threshold synchronously. Faults are detected by comparing the residual error and the threshold. In considering of the variable conditions, aerodynamic loads are introduced to the bi-step neural network. The training order spectrums are designed. Finally, the effectiveness of the proposed scheme is demonstrated by a simulation model with different faults.

scholarly journals Modeling and analysis of the characteristics of SiC MOSFET

2021 ◽  
Vol 2125 (1) ◽  
pp. 012051
Author(s):  
Guoqing Qiu ◽  
Kedi Jiang ◽  
Shengyou Xu ◽  
Xin Yang ◽  
Wei Wang
Keyword(s):  
Simulation Model ◽  
Circuit Simulation ◽  
Power Conversion ◽  
Simulation Models ◽  
Data Sheet ◽  
Superior Performance ◽  
Power Devices ◽  
Matlab Simulink ◽  
Modeling And Analysis ◽  
Mathematical Processing

Abstract Although the superior performance of SiC MOSFET devices has beenvalidated by many studies, it is necessary to overcome many technical bottlenecks to make SiC MOSFET gradually replace Si-based power devices into the mainstream. In view of the current situation where the performance of SiC MOSFETs in power conversion devices cannot be evaluated well at this stage, it is necessary to carry out fine modeling of SiC MOSFETs and establish accurate simulation models. In this paper, the powerful mathematical processing capability and rich modules of Matlab/Simulink are used to build a SiC MOSFET model, and then the product data sheet is compared with the fitted data. The results show that the switching simulation waveforms are in general agreement with the data sheet waveforms, and the error is less than 7%. Verifing the accuracy of the model and reducing the difficulty of modeling, it provides a new idea for establishing the circuit simulation model of SiC MOSFET in Matlab/Simulink.

A new simulation model for hydrodynamic behavior of rigid body in narrow space

2019 ◽  
Vol 182 ◽  
pp. 427-441 ◽  
Author(s):  
Lei Zhang ◽  
Shiyao Lin ◽  
Chizhong Wang ◽  
De Xie ◽  
Jianglong Sun
Keyword(s):  
Rigid Body ◽  
Simulation Model ◽  
Hydrodynamic Behavior ◽  
Narrow Space

Pseudo-rigid-body dynamic modeling and analysis of compliant mechanisms

2017 ◽  
Vol 232 (9) ◽  
pp. 1665-1678 ◽  
Author(s):  
Yue-Qing Yu ◽  
Qian Li ◽  
Qi-Ping Xu
Keyword(s):  
Rigid Body ◽  
Dynamic Model ◽  
Dynamic Modeling ◽  
Dynamic Models ◽  
Compliant Mechanisms ◽  
Lagrange Equation ◽  
Dynamic Responses ◽  
Modeling And Analysis ◽  
Rigid Body Dynamic ◽  
Body Dynamic

An intensive study on the dynamic modeling and analysis of compliant mechanisms is presented in this paper based on the pseudo-rigid-body model. The pseudo-rigid-body dynamic model with single degree-of-freedom is proposed at first and the dynamic equation of the 1R pseudo-rigid-body dynamic model for a flexural beam is presented briefly. The pseudo-rigid-body dynamic models with multi-degrees-of-freedom are then derived in detail. The dynamic equations of the 2R pseudo-rigid-body dynamic model and 3R pseudo-rigid-body dynamic model for the flexural beams are obtained using Lagrange equation. Numerical investigations on the natural frequencies and dynamic responses of the three pseudo-rigid-body dynamic models are made. The effectiveness and superiority of the pseudo-rigid-body dynamic model has been shown by comparing with the finite element analysis method. An example of a compliant parallel-guiding mechanism is presented to investigate the dynamic behavior of the mechanism using the 2R pseudo-rigid-body dynamic model.

SPHERE ENCAPSULATED ORIENTED-DISCRETE ORIENTATION POLYTOPES (S-DOP) COLLISION CULLING FOR MULTI-, RIGID BODY DYNAMIC

2015 ◽  
Vol 75 (2) ◽  
Author(s):  
Norhaida Mohd Suaib ◽  
Abdullah Bade ◽  
Dzulkifli Mohamad
Keyword(s):  
Rigid Body ◽  
Collision Detection ◽  
Simulation System ◽  
Improve Performance ◽  
Excellent Performance ◽  
Approximation Techniques ◽  
Rigid Body Dynamic ◽  
Rigid Body Simulation ◽  
Body Dynamic

This paper discusses on sphere encapsulated oriented-discrete orientation polytopes (therefore will be referred to as S-Dop) collision culling for multiple rigid body simulation. In order to improve performance of the whole simulation system, there are available options in sacrificing the accuracy over speed by using certain approximation techniques. The aim of this research is to achieve excellent performance through implementation of suitable culling technique, without jeopardizing the resulting behavior so that the simulation will still be physically plausible. The basic idea is to identify the highly probable pairs to collide and test the pair with a more accurate collision test in broad-phase collision detection, before the pair is passed to a more costly stage. Results from the experiments showed that there are a number of ways to implement the sphere encapsulated or-Dops (S-Dop) collision culling on a multiple rigid body simulation depending on the level of performance needed.  

Simulation Modeling and Analysis of Fire Fighting Operations in the State of Kuwait

2015 ◽  
Vol 8 (2) ◽  
pp. 31-48
Author(s):  
Mehmet Savsar ◽  
Esra Aleisa
Keyword(s):  
Response Time ◽  
Simulation Model ◽  
Emergency Services ◽  
Human Life ◽  
Discrete Event ◽  
The State ◽  
Modeling And Analysis ◽  
Operational Conditions ◽  
Positive Effects ◽  
The State Of Kuwait

Emergency services, including firefighting operations, are complex processes and involve several activities in different stages that function together to achieve a main goal of preventing destruction in human life, property, and environment. This study uses discrete event simulation (DES) to model and improve firefighting operations in the state of Kuwait. The main objective is to reduce the response time required to reach an accident place. It is a life-saving criterion that needs to be considered. This study is conducted by collecting thorough data of fire operation department over a period of five years and accordingly creating a valid simulation model to analyse the system under current operational conditions nationwide. Analysis of variance (ANOVA) was used to identify factors that were statistically proven to have positive effects in reducing response time. A simulation model was used as a medium to carry out these experiments. The results of simulation model were validated at 95% confidence level. The effectiveness of the analysis is examined by incorporating related parameters from the ANOVA model into simulation model. The response time was reduced from seven minutes to three minutes on average per incident per fire station.

Research and Realization of Simulation for Automobile Steering Resisting Torque

2015 ◽  
Vol 733 ◽  
pp. 745-748 ◽  
Author(s):  
Li Ying Wu ◽  
Tong Qiang Xu ◽  
Tian Luo
Keyword(s):  
Control System ◽  
Simulation Model ◽  
Working Conditions ◽  
Model Simulation ◽  
Steering System ◽  
System Control ◽  
Experiment Platform ◽  
Test Platform ◽  
Loading Device ◽  
Set Up

In this paper, through analyzing the generating mechanism of automobile steering resisting torque, we build MATLAB/SIMULINK torque simulation model and get the steering resisting torque under different working conditions. And the results show that the model has a higher accuracy through comparing it with actual measured steering resisting torque. Design and set up the experiment platform composed of three parts including steering system, control system and torque loading device. Based on the data of steering resisting torque obtained from the model simulation, we manipulate torque loading device to input a certain of resistance for steering system ,thus to realize accurate simulation of various steering condition on test platform ,which has paved the way for the development and debugging of EPS controller.

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