Development of nanopositioning mechanism with real-time compensation algorithm to improve the positional accuracy of a linear stage

2017 ◽  
Vol 50 ◽  
pp. 328-336
Author(s):  
Jae-Chang Lee ◽  
Seung-Han Yang
Keyword(s):  
Real Time ◽  
Linear Stage ◽  
Positional Accuracy ◽  
Compensation Algorithm

Wind-gust Compensation Algorithm based on High-gain Residual Observer to Control a Quadrotor Aircraft: Real-time Verification Task at Fixed Point

2018 ◽  
Vol 16 (2) ◽  
pp. 856-866 ◽  
Author(s):  
Abraham Efraim Rodríguez-Mata ◽  
Ivan González-Hernández ◽  
Jesus Gabriel Rangel-Peraza ◽  
Sergio Salazar ◽  
Rogelio Lozano Leal
Keyword(s):  
Fixed Point ◽  
Real Time ◽  
High Gain ◽  
Wind Gust ◽  
Verification Task ◽  
Compensation Algorithm ◽  
Quadrotor Aircraft

Errors Analysis and Compensation of Six-Axis Force Sensor Based on Stewart Platform

2011 ◽  
Vol 317-319 ◽  
pp. 1041-1044
Author(s):  
Zhi Jun Wang ◽  
Jian Tao Yao ◽  
Yu Lei Hou ◽  
Yong Sheng Zhao
Keyword(s):  
Numerical Simulation ◽  
Measurement Error ◽  
Dynamic Response ◽  
Real Time ◽  
External Force ◽  
Force Sensor ◽  
Stewart Platform ◽  
Force Sensors ◽  
Compensation Algorithm ◽  
Errors Analysis

Six-axis force sensors based on Stewart platform necessitate highly accurate, sensitivity and dynamic response. In response to this need, errors analysis and compensation of the force sensor are essential. In this paper, the measurement error generated by the upper platform deformation is discussed and evaluated. Furthermore, in order to improve the precision, a real-time compensation algorithm is proposed depending on the external force applied on the force sensor. Finally, a numerical simulation example is presented, which indicates that the precision is related to the stiffness of limbs directly and improved obviously by the compensation algorithm.

REAL-TIME MACHINING QUALITY INSPECTION FOR DESIGN FOR MANUFACTURING (DFM)

2005 ◽  
Vol 04 (01) ◽  
pp. 21-36 ◽  
Author(s):  
YONGJIN KWON ◽  
TERESA WU
Keyword(s):  
Real Time ◽  
Measurement Data ◽  
Response Speed ◽  
Design For Manufacturing ◽  
Product Development Process ◽  
Inspection Time ◽  
Quality Inspection ◽  
Positional Accuracy ◽  
Measuring Machine ◽  
Touch Probe

A dynamic, globalized and customer-driven market brings opportunities and threats to companies, depending on the response speed and production strategies. One strategy is Concurrent Engineering (CE) that focuses on improving the product development process, by considering various factors associated with the life cycle of the product from the early stages of the product design. Design for Manufacturing (DFM) has proven to be an effective approach to implement CE concept. Recently, an important DFM concept in machining (i.e. a real-time inspection) has drawn much attention from both academia and industry. This is because intense domestic and international competition has put more emphasis on the part quality to achieve a shorter inspection time, improved part accuracies, and reduced scrap. The current methodology, using a machine mounted touch probe, suffers from the fact that the measurement accuracy is affected by the individual machine tool's positional accuracy and positioning system. To address this concern, the cutting experiments were conducted to collect touch probe measurement data. The data were analyzed to verify whether using a touch probe is suitable for real-time inspection. The analysis results show the touch probe has the higher capability index numbers and consistencies than the coordinate measuring machine (CMM), suggesting that the touch probe can be integrated into DFM as a means of real-time quality inspection.

scholarly journals The "dual-spot" Aethalometer: an improved measurement of aerosol black carbon with real-time loading compensation

2015 ◽  
Vol 8 (5) ◽  
pp. 1965-1979 ◽  
Author(s):  
L. Drinovec ◽  
G. Močnik ◽  
P. Zotter ◽  
A. S. H. Prévôt ◽  
C. Ruckstuhl ◽  
...  
Keyword(s):  
Real Time ◽  
Black Carbon ◽  
Source Apportionment ◽  
Accurate Determination ◽  
Optical Measurements ◽  
Quality Data ◽  
Loading Effect ◽  
Adverse Health Effects ◽  
Compensation Algorithm

Abstract. Aerosol black carbon is a unique primary tracer for combustion emissions. It affects the optical properties of the atmosphere and is recognized as the second most important anthropogenic forcing agent for climate change. It is the primary tracer for adverse health effects caused by air pollution. For the accurate determination of mass equivalent black carbon concentrations in the air and for source apportionment of the concentrations, optical measurements by filter-based absorption photometers must take into account the "filter loading effect". We present a new real-time loading effect compensation algorithm based on a two parallel spot measurement of optical absorption. This algorithm has been incorporated into the new Aethalometer model AE33. Intercomparison studies show excellent reproducibility of the AE33 measurements and very good agreement with post-processed data obtained using earlier Aethalometer models and other filter-based absorption photometers. The real-time loading effect compensation algorithm provides the high-quality data necessary for real-time source apportionment and for determination of the temporal variation of the compensation parameter k.

scholarly journals The "dual-spot" Aethalometer: an improved measurement of aerosol black carbon with real-time loading compensation

2014 ◽  
Vol 7 (9) ◽  
pp. 10179-10220 ◽  
Author(s):  
L. Drinovec ◽  
G. Močnik ◽  
P. Zotter ◽  
A. S. H. Prévôt ◽  
C. Ruckstuhl ◽  
...  
Keyword(s):  
Real Time ◽  
Black Carbon ◽  
Source Apportionment ◽  
Accurate Determination ◽  
Optical Measurements ◽  
Quality Data ◽  
Loading Effect ◽  
Adverse Health Effects ◽  
Compensation Algorithm

Abstract. Aerosol black carbon is a unique primary tracer for combustion emissions. It affects the optical properties of the atmosphere and is recognized as the second most important anthropogenic forcing agent for climate change. It is the primary tracer for adverse health effects caused by air pollution. For the accurate determination of mass equivalent black carbon concentrations in the air and for source apportionment of the concentrations, optical measurements by filter-based absorption photometers must take into account the "filter loading effect". We present a new real-time loading effect compensation algorithm based on a two parallel spot measurement of optical absorption. This algorithm has been incorporated into the new Aethalometer model AE33. Intercomparison studies show excellent reproducibility of the AE33 measurements and very good agreement with post-processed data obtained using earlier Aethalometer models, and other filter-based absorption photometers. The real-time loading effect compensation algorithm provides the high-quality data necessary for real-time source apportionment, and for determination of the temporal variation of the compensation parameter k.

scholarly journals The development of a geo-referencing system for machine controlled construction equipment

2021 ◽  
Author(s):  
Nicholas Muth
Keyword(s):  
Real Time ◽  
Least Squares Method ◽  
Vertical Component ◽  
Simulated Data ◽  
Kinematic Chain ◽  
Construction Equipment ◽  
Main Body ◽  
Total System ◽  
Positional Accuracy ◽  
End Effector

Machine controlled construction equipment (MCE) continues to garner support from the construction industry due to shortages of skilled labor, constant technological advances and the importance of construction to the overall economy. MCE requires reliable, real-time geo-referencing of the equipment end-effector. However, MCE research continues to focus on relative positioning for control system design, while research dealing with geo-referencing has been mainly in the fields of aerial mapping and terrestrial mobile mapping, which can benefit from post-processing. The research described in this thesis attempts to overcome this problem by developing a real-time geo-referencing system specifically for MCE. The total system consists of three components; an integrated DGPS/INS to geo-reference the equipment main-body; an open kinematic chain to relatively position the end-effector with respect to the main-body; and a unified model to geo-reference the end-effector. The system carrier is designed for an excavator, but the model for the development of the open kinematic chain, designed using the Denavit-Hartenberg convention, can accommodate any type of MCE. The overall objective was the development of a precise geo-referencing system that could be operated under all construction conditions and could achieve an accuracy required for the recording of exposed infrastructure which calls for a vertical component of 15mm. This required high-level accuracy in both the position and orientation, therefore, DGPS and INS were integrated. Furthermore, the positional accuracy required double-differenced carrier phase measurements implemented using a least squares method for ambiguity resolution. Extended Kalman filters (EKF) were used for DGPS baseline estimation and DGPS/INS integration, the latter using a tightly-coupled, closed-loop architecture. Finally, error analysis was completed on the open kinematic chain to resolve the accuracy required in the joint sensors. System testing was completed using sample data from an International Federation of Surveyors Commission mobile van test and simulated data for the open kinematic chain. Results showed that the geo-referencing system was able to achieve ±0.024m (RMSE) horizontally and ±0.034m (RMSE) in height when the excavator was stationary and executing a common digging trajectory. The accuracy achieved would allow the excavator to operate autonomously for several common construction tasks.

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