Advanced Materials Research Vols. 718-720

Abstract: Based on the application of the CSI non-contact full field strains and 3D displacements gauge made in USA in the laboratory for wind engineering of Southwest Jiaotong University, the theory of DIC, a non-contact deformation measurement method, is studied in the paper. The reliability of the method is testified by contrast tests. The paper also offers some useful advice byanalysing the factors that affect the measurement accuracy.

Abstract: The international community is increasingly concerned about saving energy and less carbon dioxide emissions. But with growing air passenger and cargo traffic, the airspace tension highlights would inevitably lead to the increase in carbon emissions. However, there is little research on the methods of reducing carbon emission in airspace optimization. So this paper does some research in this field. Firstly this paper provides and exemplifies the method for decreasing the carbon emissions in airspace optimization. Secondly it puts forward the BPR function model to estimating the amount of carbon emissions of the method of increasing the number of air routes and uses the Regression analysis to confirm the parameters αβ. At last utilizing the specific data testifies the huge contribution of reducing the amount of carbon emissions from airspace optimization.

Abstract: This paper establishes a mathematical model of assessing the various factors of the uncertainty in analysis of nitrite in water by HPLC-DAD, investigates all the steps of the measurement by HPLC and calculates the various factors of evaluating the uncertainty analysis. The result shows: in this method the nitrite content in certain domestic sewage is measured 1.161 mg·L^-1, and the uncertainty from the standard material and the test standard deviation under the repeatable conditions contribute mainly to the uncertainty of measuring the nitrite content in water. The uncertainty from the standard material generally includes the uncertainties from standard dilution, standard product purity and the environment temprature, in which the extraction, dilution and stability of the standard solution are the main contributors to the uncertainty from standard dilution. After calculation the relative uncertainty synthesis of nitrite content in water uncertainty is 0.0050, when the confidence probability P=95% and the expanded uncertainty 0.012mg·L^-1. Without regard to the inhomogeneity of the nitrite distribution in water sample, the content of nitrite in water sample can be presented as (1.161±0.012) mg·L^-1.

Abstract: To address the problems of low efficiency, high cost and low automatic level existing in traditional laser tracking measurement systems, a laser tracking-vision guiding measurement system for large-scale parts assembly is introduced in this paper. The system is composed of mono-camera and a laser tracker, can fulfill real-time tracking and automatic measurement throughout the whole assembly process. A global calibration method based on public planes and a method for finding the 3D positions of the target reflectors based on monocular vision measuring are expounded. Mathematical model is established, measurement system is built, and the experiment is accomplished. The experiment result indicates that the proposed system features relative high degree of automation and high measuring speed, has future in practical application.

Abstract: Dealing with the relationship properly between the sensor scanning and signal acquisition is the base of hi-speed and hi-precision MFL (magnetic flux leakage) testing for steel pipe. Firstly, the MFL wave form characteristic was established using magnetic dipole theory. Further, on that basis, the relationship between signal frequency and sensor scanning was analyzed. Finally, sample frequency was designed according to the requirement of the automatic steel pipe MFL testing. Additionally, the MFL signal acquisition experiment was conducted to verify the influence of the signal sampling frequency. The signal acquisition analysis was of great significant to perform the MFL testing for steel pipe in hi-speed and hi-precision.

Abstract: In order to test passive direct methanol fuel cell and simultaneously observe anode and cathode of a fuel cell, we designed and built a test system. The test system consists of four units: temperature control unit, lighting unit, camera unit and test and data acquisition unit. With a two-floor placement design, we separated tested object and its close auxiliary components from other devices. The design is critical for changing inclination angle between outward normal of anode and gravity direction, which is important to the experiment. The control interface of the test system makes it suitable for a microgravity test system in NMLC (National Microgravity Laboratory Center). Considering the test system will be used for microgravity experiment besides routine normal gravity experiments, many specific issues have been taken into account.

Abstract: Analyzing series images is the main method to clear up the attitude of High-speed target at present, and the coherence of the space coordinates of the image capture device is the key to solve the problem whether we can deal with those series images convenience. In order to make the capture ratio of the capture device high, and make the image processing convenient, Developed a method to demarcate the space coordinates of those gauging stations. Propose a method that using a semiconductor laser for a Imaginary benchmark straight line, Adjusting the position of the reference material with the optical system and position-sensitive detectors (PSD) to provide a benchmark for the space coordinate calibration of the gauging stations. We analyzed the measuring precision and repeatability of the method. The method is easy, high accuracy, high repeatability and widely used in many aspects.

Abstract: This article mainly introduces the nondestructive detection technologies for Japanese abandoned chemical weapons (JACWs) in China. The aim, task and technical requirements of the nondestructive detection for JACWs are discussed in detail. Practical methods and procedure of JACWs nondestructive detection are given by compared and confirmed with some different geophysical exploring technologies. Two key nondestructive detection technologies, the magnetic exploring method and the usage of metal detector, are discussed in details. In the practice of JACWs nondestructive detection, it is proved that these two methods and procedures have advantages such as high efficiency, low risk and low cost.

Abstract: Circumferential magnetization of the thick wall steel pipe is carried out for the inspection of longitudinal defects in magnetic flux leakage testing. For high precision magnetic flux leakage testing, magnetic field distribution along the axial direction must be uniform, thus a new type of pole shoe structure is proposed in this paper to enlarge the uniformly magnetized area. Thick wall steel pipes are hard to be magnetized to near saturation, especially when the new pole shoe is used, which makes difficult for the magnetic sensors to pick up the magnetic leakage field. Therefore, the relationship between the magnetic flux density of the detection zone and the dimensions of the magnetizer has been studied by finite element simulation. These results are helpful in the design of circumferential magnetizer.

Abstract: The flow rate and water level measure is one key work of the pumping station field test. And the reliable, applicable, economic and effective measurement method and instruments are the key decisive factors of the field test. The urban drainage pumping stations usually pump sewage, and its inlet structure and outlet structure generally use closed arrangement. These make the flow rate and water level measurement of the field test become complicated. Based on the characteristics of urban drainage pumping station, this paper analyzed the measurement methods of flow rate and water level parameters of the field test for urban drainage pumping station. In combination with a field test case for an urban drainage pumping station, this paper demonstrated how to choose the reliable, applicable, economic and effective measurement method to measure flow rate and water level parameters.