Papers by Keyword: Infrared Ray

Abstract: Self-compacting high-strength concrete (SCHSC) is an innovative concrete that has superior physical and mechanical properties, and does not require vibration for placing and compaction. Heat treatment (HT) of SCHSC can significantly accelerate the strength growth during cast-in-situ construction, and allows to reduce the turnover of formwork, the labor costs for construction, and the construction period. The issue of strength development of SCHSC during HT has been studied. SCHSC of R₂₈ = 100 MPa was studied. Test specimens were cured with HT by infrared rays for 7, 9, 11, 13, 16 and 24 hours. Then warmed specimens were tested for compressive strength after 0.5, 4, 12 and 24 hours of cooling period. Study was carried out on the basis of analyzing, generalizing and evaluations of experimental data. A mathematical model is proposed for determining the compressive strength of SCHSC after one day of curing with HT.

Abstract: An investigation of radiant heat distribution on drying area in the chamber of infrared-rotary dryer (IRD) was conducted by measuring the values of infrared radiation on drum surface of the dryer chamber and then showed in term of surface temperature (ST). A gas-fired infrared burner (GIB) was used as the heat source, radiated the electromagnetic wave in the length of near-infrared ray. The drum surface was set as an infrared radiant absorbing area, installed with type K thermocouples and set as grid. Different levels of drum diameters (D=700, 900 and 1100 mm.), infrared peak wavelengths (IRP=3.32, 2.97 and 2.70 micron), distances between GIB and drum surface (H=300, 400 and 500 mm.), grid positions on drum surface (longitudinal direction (L) and radial direction (W) = 900 x 900 mm²) were applied. Then, distribution of surface temperature values was analyzed, based on response surface methodology (RSM) obtained from a second order polynomial model. The results showed that IR and H were the main factors affecting the radiant heat distribution. Then, the surface plots of ST levels on the absorbing drum surfaces in the rotary drying chamber were constructed. The contour plot results were indicative of a use for the design and selection of an appropriate size of area for drying with uniform distribution of IR in accordance with user-defined parameters.

Abstract: The research programs and positioning methods of precise positioning technology of the Mine locomotive unmanned systems were discussed in this paper, It implements the positioning of three-dimensional spatial coordinates, and analyses the experiment of positioning calculation and positioning deviation. Experimental results show that the new technique and method can improve precision positioning accuracy above 5%, and provide reliable security protection for the Mine locomotive unmanned systems.

Abstract: In order to look for a low-energy–consumption and high-efficiency drying method, the drying characteristics of agar under infrared ray were studied. The results show that temperature has more obvious influence than granularity on the drying rate of agar. With the increase of temperature, the drying rate increases. The agar granularity does not have a significant influence on the drying rate. Comparisons of different drying models at different temperatures were made through linear regression analysis program. The results show that the drying procedure of agar under infrared ray can accurately be described by the Page model, and the drying rates and moisture contents at different drying stages can also be easily estimated with it.

Abstract: We deal with the problem of moving control of an automatic guided vehicle (AGV) in a specific environment, that is, a crematorium which has a narrow indoor environment. In such an environment, an AGV itself can transport a dead body to a designated furnace safely. A well-known method of burying guided lines under the floor is not proper to such an environment because its floors are made of expensive materials, i.e., marbles, and thus it has no flexibility. In this paper a new method of precision control of the AGV using infrared ray sensors is presented. With this approach, the AGV itself emits infrared rays to the landmarks adheres to the ceiling to obtain a moving direction and then moves to that direction by correctly recognizing them. One of the typical problems in a crematorium is that dead zone and overlapping zone may exist due to radiation and reflection of lights. To resolve this, an algorithm of recognizing double landmarks is applied to reduce its sensing errors. In addition, when the AGV changes its direction to enter the furnace, a precision control of the wheel moving trajectories of the AGV under acceleration and velocity constraints should be needed. Our proposed method formulates and simulates the desired trajectory of the AGV and then modifies it to compensate delay dynamics and vibration. The effectiveness of the proposed method was demonstrated in a real crematorium.

Abstract: The function of components and the theory of oil-paper capacitive bushing are introduced by analyzing its contracture, and the electric properties of insulation materials are instructed. The reasons and damages of lack of oil are proper illustrated, and the judging methods are offered. The distinguishing process of lack oil of bushing is illustrated by examples, and the accuracy and rationality of lack of oil finding by capacitive volume, dielectric loss angle, oil chromatogram analyzing and infrared ray test are demonstrated.

Abstract: Water-based infrared ray shielding coating, that is, nanometer metal oxide is added to the water-based paint, which has anti-IR features without affecting the transparency of the paint. In this paper, the nanometer oxides are prepared by sol-gel method, added into polypropylene sour. In order to improve the infrared ray shielding of the thin film, two kinds of nanometer oxides are added into the polypropylene sour with different volume ratios, the shielding performance of the paint is studied. Experimental results show: in the 8000 ~ 4000cm^-1 range, the transmittances of infrared ray is 30% to 75%; in 4000 ~ 400cm^-1 range, transmittances decrease significantly; 3% ZnO, 3% Fe₂O₃, 3% Y₂O₃, 2% Al₂O₃ are the best mass ratio of every single nanometer oxide; the infrared shielding rate of Fe₂O₃ and Y₂O₃ mixture with the volume ratio of 1 to 4 is better than Fe₂O₃ and Y₂O₃ single.

Abstract: The design principle and method of infrared ray automatic detection system for grinding temperature are introduced. The Grinding Temperature Automatic Detector was designed. The system can complete temperature’s correct detection and display in the grinding field of grinding mill. All grinding mills in workshops are connected to center survey room by modern net communication technology. Center survey room can directly display and print temperatures of any grinding mill by computers, and give command to operators to adjust grinding parameters, to trim grinding wheel, to change cool strength, so that high quality and high efficiency grinding machining can be realized in the limited grinding temperature scope. For the detector, temperature detecting scope is 0~1500oC. It is identified that the relative detecting precision is less than 0.5%. The detector is connected with center survey room to form local area network, to transfer the grinding information rapidly and correctly.