Error analysis of inertia parameters measurement for irregular-shaped rigid bodies using suspended trifilar pendulum

Measurement ◽  
2021 ◽  
pp. 108956
Author(s):  
Tao Li ◽  
Wen-Bin Shangguan ◽  
Zhihong Yin
Keyword(s):  
Error Analysis ◽  
Rigid Bodies ◽  
Inertia Parameters ◽  
Parameters Measurement

scholarly journals Design optimisation for optically tracked pointers

2017 ◽  
Vol 8 (1) ◽  
pp. 10
Author(s):  
Bert De Coninck ◽  
Jan Victor ◽  
Patrick De Baets ◽  
Stijn Herregodts ◽  
Matthias Verstraete
Keyword(s):  
Error Analysis ◽  
Tracking Error ◽  
Rigid Bodies ◽  
Optical Tracking ◽  
Target Point ◽  
Tracking Systems ◽  
Design Optimisation ◽  
Final Design ◽  
Normally Distributed

The use of mechanical pointers in optical tracking systems is needed to aid registration processes of unlocated rigid bodies. Error on the target point of a pointer can cause wrong positioning of vital objects and as such these errors have to be avoided. In this paper, the different errors that originate during this process are described, after which this error analysis is used for the optimisation of an improved pointer design. The final design contains six coplanar fiducials, favored by its robustness and low error. This configuration of fiducials is then analysed theoretically as well as practically to understand how it is performing. The error on tracking the target point of the pointer is found with simulation to be around 0.7 times the error of measuring one fiducial in space. However, practically this error is about equal to the fiducial tracking error, due to the non-normally distributed errors on each separate fiducial.

scholarly journals Development Identification Method of Inertia Properties for Heavy Truck Engine Based on MIMS Test Rig

2018 ◽  
Vol 153 ◽  
pp. 04009 ◽  
Author(s):  
Tianjun Zhu ◽  
Fudong Zhang ◽  
Jianying Li ◽  
Fei Li ◽  
Changfu Zong
Keyword(s):  
Measuring Method ◽  
Test Results ◽  
Test Rig ◽  
New Development ◽  
Inertia Parameters ◽  
Heavy Truck ◽  
Inertia Properties ◽  
Parameters Measurement ◽  
Vehicle Bodies ◽  
Truck Engine

A new development for the accurate measurement of the inertia parameters for heavy truck engine is presented. It is specifically intended for measuring the inertia properties of vehicle bodies, and it has the potential to be applied to the measurement of the properties of vehicle bodies, such as the vehicle powertrain, engine, and gearbox. This paper, based on CATARC MIMS test rig, develops an accurate measuring method to identify inertia parameters of heavy truck engine. Firstly corresponding tests are carried out and the lever principle and moments of inertia parallel theorem are employed to calculate and analyze the test results, which leads to the accurate value of inertia parameters. Secondly the accuracy of proposed method is verified through the calibration system. As a result the method shows high accuracy, which provides an experimental basis for accurate inertia parameters measurement of heavy truck engine.

Inertia Parameters Identification of Motor Assembly for Electric Vehicles Based on Modal Test Method

2013 ◽  
Vol 470 ◽  
pp. 534-538 ◽  
Author(s):  
Li Zhao He ◽  
Peng Yu ◽  
Tong Zhang ◽  
Rong Guo
Keyword(s):  
Error Analysis ◽  
Electric Vehicles ◽  
Center Of Mass ◽  
Moment Of Inertia ◽  
Test Method ◽  
Mass Center ◽  
Test Error ◽  
Modal Test ◽  
Drive Motor ◽  
Inertia Parameters

Inertia parameters are essential for motor assembly mounting design, which mainly includes the mass, center of mass (CM) coordinates, moment of inertia and product of inertia. This paper explains the principle and methods of modal test method. One vehicle drive motor assembly is taken as the research object, its inertia parameters are identified using this modal test method. Finally test error analysis is also performed.

Systematic Dynamic Modeling and Simulation of Multibody Offshore Structures: Application to Wave Energy Converters

2013 ◽  
Author(s):  
François Rongère ◽  
Alain H. Clément
Keyword(s):  
Wave Energy ◽  
Kinematic Chain ◽  
Offshore Structures ◽  
Rigid Bodies ◽  
Degree Of Freedom ◽  
Dynamic Simulations ◽  
Floating Structures ◽  
Wave Energy Converters ◽  
Inertia Parameters ◽  
Recursive Techniques

This article presents a framework to model and perform time domain dynamic simulations of offshore structures presenting several interconnected rigid bodies. Both fixed and 6 degree of freedom floating structures are considered. It uses a robotics formalism to parameterize the kinematic chain of the structures and is robust with respect to the number of bodies involved. Direct dynamics algorithms are given, using a consistent notation across offshore engineering and robotics fields. They use efficient recursive techniques based on Newton-Euler equations. The advantage of this framework is that tedious analytical developments are no longer needed. Instead of that, it is sufficient to provide a data parameter table as well as principal inertia parameters of each body to entirely describe the mechanical structure. An example of simulation is given, based on the 7 degree of freedom SEAREV Wave Energy Converter.

The O–C diagrams of minor planets − a new approach to modelling the rotation

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss
Keyword(s):  
Error Analysis ◽  
Time Dependence ◽  
Theoretical Work ◽  
Minor Planet ◽  
Minor Planets ◽  
New Approach ◽  
Preliminary Results ◽  
Ccd Observations

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.

Error Analysis in Neuropsychological Assessment of Verbal Memory and Learning

1995 ◽  
Vol 11 (1) ◽  
pp. 21-28 ◽  
Author(s):  
Dietmar Heubrock
Keyword(s):  
Error Analysis ◽  
Verbal Memory ◽  
Verbal Learning ◽  
Learning Disorders ◽  
Memory And Learning ◽  
Auditory Verbal Learning Test ◽  
Additional Information ◽  
Auditory Verbal Learning ◽  
Accurate Picture ◽  
Learning Test

Performance on a German version of the Rey Auditory-Verbal Learning Test (AVLT) was investigated for 64 juvenile patients who were subdivided in 6 clinical groups. In addition to standard evaluation of AVLT protocols which is usually confined to items recalled correctly, an error analysis was performed. Differentiating between total errors (TE), repetition errors (RE), and misnamings (ME), substantial differences between clinical groups could be demonstrated. It is argued that error analysis of verbal memory and learning enriches the understanding of neuropsychological syndromes, and provides additional information for diagnostic and clinical use. Thus, it is possible to gain a more accurate picture so that patients can be appropriately retrained, and research into the functional causes of memory and learning disorders can be intensified.

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