A CAE Approach for Pretest Analysis of Vehicle Body Frame Vibration Test

2011 ◽  
Vol 52-54 ◽  
pp. 1369-1374
Author(s):  
Shou Wei Lu ◽  
Hui Hua Feng ◽  
Zheng Xing Zuo ◽  
Feng Lai Yue
Keyword(s):  
Modal Analysis ◽  
General Procedure ◽  
Fem Analysis ◽  
Vehicle Body ◽  
Test Accuracy ◽  
Body Frame ◽  
Mac Method ◽  
Virtual Lab ◽  
Measurement Location ◽  
Selection Of

Pretest analysis is a crucial step of the process for experimental modal analysis, directly affect the test accuracy. A general procedure for pretest analysis of a vehicle body frame has been presented using CAE approach with software Virtual Lab. After the modal parameters are acquired from FEM analysis, the CAE based MAC method is used to optimize the measurement location and direction. The selection of an appropriate set of measurement locations and directions including initial accelerometers placement and test excitation point location are defined based on MAC method by Virtual Lab correlation part. Finally, for purpose of validation, the FEM modal analysis is compared with operational modal analysis. The results comparison showing that the present pretest analysis approach is more accuracy and efficiency.

scholarly journals Simultaneous Channel and Feature Selection of Fused EEG Features Based on Sparse Group Lasso

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Jin-Jia Wang ◽  
Fang Xue ◽  
Hui Li
Keyword(s):  
Feature Selection ◽  
Feature Selection Method ◽  
Group Lasso ◽  
High Dimensional ◽  
Test Accuracy ◽  
Gradient Descent Method ◽  
Feature Subset ◽  
Eeg Signals ◽  
Sparse Group Lasso ◽  
Selection Of

Feature extraction and classification of EEG signals are core parts of brain computer interfaces (BCIs). Due to the high dimension of the EEG feature vector, an effective feature selection algorithm has become an integral part of research studies. In this paper, we present a new method based on a wrapped Sparse Group Lasso for channel and feature selection of fused EEG signals. The high-dimensional fused features are firstly obtained, which include the power spectrum, time-domain statistics, AR model, and the wavelet coefficient features extracted from the preprocessed EEG signals. The wrapped channel and feature selection method is then applied, which uses the logistical regression model with Sparse Group Lasso penalized function. The model is fitted on the training data, and parameter estimation is obtained by modified blockwise coordinate descent and coordinate gradient descent method. The best parameters and feature subset are selected by using a 10-fold cross-validation. Finally, the test data is classified using the trained model. Compared with existing channel and feature selection methods, results show that the proposed method is more suitable, more stable, and faster for high-dimensional feature fusion. It can simultaneously achieve channel and feature selection with a lower error rate. The test accuracy on the data used from international BCI Competition IV reached 84.72%.

Modal Analysis on Bus Body Frame Based on I-DEAS Software

2012 ◽  
Vol 182-183 ◽  
pp. 865-868
Author(s):  
Yuan Hua Chen
Keyword(s):  
Modal Analysis ◽  
Theoretical Basis ◽  
Natural Frequencies ◽  
Body Frame ◽  
Bus Body

The author sets up the FEA modal of a bus body using the I-DEAS software and applies load.After solution,the athor gets the frame’s former ten natural frequencies and their corresponding vibration shapes.This can supply the important theoretical basis in analysis and calculation and in improving the design of the bus body.

Type Synthesis of 3-DOF Spherical Parallel Manipulators Based on Screw Theory1

2004 ◽  
Vol 126 (1) ◽  
pp. 101-108 ◽  
Author(s):  
Xianwen Kong ◽  
Cle´ment M. Gosselin
Keyword(s):  
Parallel Manipulator ◽  
Screw Theory ◽  
General Procedure ◽  
Kinematic Chain ◽  
Parallel Manipulators ◽  
Type Synthesis ◽  
Validity Condition ◽  
First Time ◽  
Spherical Parallel Manipulator ◽  
Selection Of

A spherical parallel manipulator (SPM) refers to a 3-DOF (degree-of-freedom) parallel manipulator generating 3-DOF spherical motion. A method is proposed for the type synthesis of SPMs based on screw theory. The wrench systems of a spherical parallel kinematic chain (SPKC) and its legs are first analyzed. A general procedure is then proposed for the type synthesis of SPMs. The type synthesis of legs for SPKCs, the type synthesis of SPKCs, as well as the selection of inputs of SPMs are dealt with in sequence. An input validity condition of SPMs is proposed. SPKCs with and without inactive joints are synthesized. The number of overconstraints of each SPKC is also given. The phenomenon of dependent joint groups in an SPKC is revealed for the first time.

Verifications of Movable Roll Center Behaviors in Vehicle Body Frame Geometry

2010 ◽  
Vol 43 (7) ◽  
pp. 644-649
Author(s):  
Wataru Kubota ◽  
Masayuki Ishikawa ◽  
Motohiro Kawafuku ◽  
Makoto Iwasaki ◽  
Takehito Fujii
Keyword(s):  
Vehicle Body ◽  
Body Frame

scholarly journals Locomotive Lifter for Parking in Congested Places

2019 ◽  
Vol 9 (2) ◽  
pp. 758-760
Keyword(s):  
Small Area ◽  
Fluid Pressure ◽  
The Other ◽  
Vehicle Body ◽  
Radius Of Curvature ◽  
Body Frame ◽  
Parallel Parking ◽  
Piston Cylinder ◽  
Metropolitan Cities ◽  
Exact Position

Locomotive Lifter is an independent attachment implied on the vehicle body frame in order to lift and move the vehicle at right angles from it’s exact position using the retractable arm provided with the wheel dolly for parking in congested places. It works on the principle that the fluid pressure (hydraulic or pneumatic) applied in the piston cylinder respectively pulls the arm and lifts the vehicle, due to small area of the wheel dolly the effort (force applied) to push the vehicle is less irrespective of the immense structure of the vehicle. Now-adays the most common issue probably dealt in metropolitan cities is that the mishap in parking the car in the portico or on the adjacent road side parallelly with part of the car body to be hanging outside the passage. Merely, there is enough of space to park the car but to say it is hardly occupied. The unoccupied space is due to irregular parking of the other cars crossing the parking lanes on the either sides in parallel parking or the standing pillar in indoor parking which does not allow the car to turn with it’s free radius of curvature. In order to park the car perfectly one has to arrest the position of the either axial of the car and the other axial wheel has to be tilt at right angles to make an arc to park. But this case isn’t possible i.e. tilting the wheels at right angle. Besides the help of this “Locomotive Lifter” we can rotate the position of the car in all 360’degree direction, either the car can be moved or the car can be rotated.

scholarly journals Development of virtual benches for testing the digital twin of a vehicle

2021 ◽  
Vol 284 ◽  
pp. 06006
Author(s):  
Pavel Cvetkov ◽  
Elena Zhilenkova ◽  
Anton Zhilenkov
Keyword(s):  
Power Plant ◽  
Automotive Industry ◽  
Test Bench ◽  
Vehicle Body ◽  
Passive Safety ◽  
Body Frame ◽  
Cooling Systems ◽  
Digital Platform ◽  
Digital Twin ◽  
Virtual Test

The article analyzes the approaches to the creation of the concept of a virtual test bench for testing the digital twin of the automotive industry product. Such components of the digital platform as suspension area, power plant, braking and cooling systems are being investigated. The problem of the implementation in the digital twin of such important units as the attachment points of units and assemblies on the vehicle body frame, even surface, driver dummy, the scheme of attachment of body elements, etc is studied. The importance of the implementation of such benches as platforms for assessing the indicators of the vehicle passive safety or as stand for assessing the water tightness of the vehicle body is considered. A number of results that illustrate development areas and success of the authors of the article in these areas are presented. It is shown that the digital platform can be used for certification and rating tests, assessing the comfort and visibility of the driver's cab.

ANSYS Application in Modal Analysis of Bus Body Frame

2012 ◽  
Vol 605-607 ◽  
pp. 656-659
Author(s):  
Li Xu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Modal Analysis ◽  
Dynamic Performance ◽  
Modal Parameters ◽  
Body Frame ◽  
Critical Problems ◽  
Bus Body ◽  
Element Method

Some critical problems of bus body frame during the modal analysis are presented by the principle of Finite Element Method. Then bus body frame is analyzed. After the modal parameters of the frame are obtained, dynamic performance of body frame is discussed to provide reference for the betterment of body frame dynamic performance design.

NON-CON NON-CONTACT POINT MEASURING EQUIPMEN T MEASURING EQUIPMENT FOR ROBO T FOR ROBOTIC SYSTEMS OF AUTOMOBILE INDUSTRY

2020 ◽  
Vol 2020 (4) ◽  
pp. 232-238
Author(s):  
J Khollhujayev ◽  
◽  
N Abdukarimov ◽  
J Mavlonov ◽  
N Abdivahidova
Keyword(s):  
Contact Point ◽  
Measuring System ◽  
Vehicle Body ◽  
Inspection Time ◽  
Robotic Arm ◽  
Small Scale ◽  
Prototype Model ◽  
Laser Sensor ◽  
Body Frame ◽  
Measuring Machine

The non-contact measurement method development is caused by the need for precise measurement and elimination of an operator’s errors. The purpose of the atticle research is to develop a reliable small scale prototype model of non-contact point measuring system. The mathematical model of robotic articulated arm has been developed to analyze the forward kinematics. Then, the prototype model of a robotic arm and laser-sensor mounted technique have been developed to take the measurements. The idea was derived from the coordinate measuring machine working principle, that puts the tip or tool center point in the known position with necessary precision. Most of the production engineers rely on the measurement data obtained from the CMMs. Most of the CMMs used in Uzbekistan are mainly contact based CMMs that have a number of disadvantages, i.e. a liitle inspection time. Also, the ergonomics and redundancy of the CMMs body frame are not acceptable. The surfaces of a vehicle body frame are designed in the free forms to give better aerodynamics and smaller resistance coefficients that result in difficult shapes that is not possible to reach easily with the ordinary CMM. The scientifically-developed robotic arm based on the non-contact CMM helps to cope with this issues

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