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This paper presents a novel technique for surface roughness measurement using a photometric stereo method together with a coordinate measuring machine (CMM). The photometric stereo system was tested by some surface roughness standards. The roughness average (Ra) computed from the recovered surface was compared with the values measured from contacting roughness measurement. Since the illumination angles...
Electro-optical detection systems should be calibrated prior to use, a commonly used method with an autocollimator and a high precision turntable may introduce large error in the calibration process. This paper analyzed the calibration process, and showed that the nature of the problem was attributed to the plane rotation around a non-orthogonal axis. The mirror's non-orthogonal rotation was divided...
We quantify carbon emissions and savings in Demand Side Response (DSR) programmes, such as Short Term Operating Reserve (STOR) and Triad, substituting grid energy in the UK power networks. We model each of the DSR programmes with configurations and assumptions appropriate for the UK energy industry. This enables us to compare carbon emissions between the business-as-usual (BAU) and the smart intervention...
Scale factor nonlinearity is one of the main errors of MEMS gyroscopes. This paper firstly analyzes the operating principle of MEMS gyroscopes, and presents the commonly used model in calibration process. It is proved that calibrating the gyroscope scale factor in segments will result in higher fitting accuracy. Since it is difficult to determine the inverse function of a higher order function in...
This paper presents a novel floating significant bits notation method for the quantized sampled binary data. The quantized output of a high precision A/D converter is mapped into another datum of lower precision, with a float counter field to code the number of leading zeros in the original datum and the remaining bits to record the sign and significant bits. The notation ignores the less significant...
This paper retrieves source data on the theme of communities of practice from ISI Web of Knowledge database, and uses the software of Cite Space II to draw the map of communities of practice domain about national or regional distribution, classic works, hot-spot and cutting-edge research content, then makes specific analysis. It is found that there is a wide range of collaborative research developed...
Flight stability of air vehicles is often considered a significant research issue during aircraft structure design process. In the attempt to improve such properties, the investigation of the effects the design parameters may have on the flight stability or anti-disturbance property has become a constituent part in design and testing stage. Micro air vehicles (MAVs) are small size unmanned aircraft,...
The proposed Advanced Virtual Coordinate Measuring Machine (AVCMM) features vivid graphical representation and powerful simulation of CMM operations, together with Monte Carlo based uncertainty evaluation. It provides an integrated virtual environment, in which user can plan inspection strategy for a given task, carry out virtual measurements, and evaluate the uncertainty associated with the measurement...
The mechanical resonance of structures is often blamed for their collapse. In the attempt to prevent such usually catastrophic events, the identification of the natural frequencies has usually become a constituent part of the design activity of mechanical structures. Micro Air Vehicles (MAVs) are small size unmanned aircraft. This study aims to give a place to the numerical finite element method (FEM)...
Existing VCMMs (virtual coordinate measuring machine) have been mainly developed to either simulate the measurement process hence enabling the off-line programming, or to perform error analysis and uncertainty evaluation. Their capability and performance could be greatly improved if there is a complete solution to cover the whole process and provide an integrated environment. The aim of this study...
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