Key Engineering Materials Vols. 656-657

Abstract: Rice Color Sorter plays an important role in the postharvest rice processing assembly. The quality and price of rice export will be increased by using this machine for classifying finished-rice. This paper presents the designing, the slide–adjustment structure and the position of nozzles for a rice color sorter machine. Slides, nozzles and materials-catching slide are main factors in classifying-component of Rice Color Sorter. The relative positions of these factors will decide the accuracy and response-ability of identification process using the high speed CCD camera. Moreover, the relationship of parameters decides the relative distance between devices in classifying-component of Rice Color Sorter with a standard-work mode. It also gives suitable-adjustment-structures for Rice Color Sorter responding the best image-identifying-control module of CCD camera.

Abstract: In recent years, mobile robot is one of the most interesting topics attracting scientists and factories. With breakthrough techniques in sensor, we can control a mobile robot more reliably. Besides, measuring at static state of the inductive proximity sensor is also necessary since the detective and navigation systems perform more accurately by information from the experiment by analyzing the signal. The purpose of this paper, the hand-made measurement system is used to verify the static performance with the type of aluminium and analyse the relationship between the output signal and the position of the sensor. All we know that the relationship of the static parameters can be determined such as: sensing distance, dimension of material, thickness of material, and so on. The measured data have shown the output signal of proximity sensor in the model and theory which is not identical. The results will provide some information about the different effects of position sensor and optimum operating range of a mobile robot. In addition, by comparing the results achieved, giving solutions to enhance the static performance of the proximity sensor for a mobile robot, such as: choosing of material thickness ranges which is suitable for the operation of a mobile robot, setting the proper sensing distance to be the most stable. This research aims to provide a secure and accurate signal for the control of mobile robots.

Abstract: This paper presents the data structure combining from 3D laser scanners direction, for processing rapid prototyping by SLS machine. Formed data will have special structure for combining with the rapid prototyping machine and processing will be more directly and easily. Control algorithm automatically identifies the images from the scanning data.

Abstract: The KB 5 high pressure gas burners are popularly and widely used at the food stands in Thailand. The gas burner models are of various properties depending on the each factory’s design. The differences of the designs affect the Liquid Petroleum Gas (LPG) consumption to a different extent. This study aimed to evaluate the parameters: the degrees of outer and inner ports; and the number of outer and inner ports of high pressure gas burners which are sold in Thailand. The thermal efficiency was tested with reference to the Standard Industrial stoves in household with liquid petroleum gas (TIS 2312-2549). The result showed that, by increasing the degrees of outer ports from 45 to 80, the thermal efficiency increased by 0.24%; while by increasing the degrees of inner ports from 50 to 60, the thermal efficiency increased 0.11%. By increasing the number of the outer ports from 35 to 38, the thermal efficiency increased 0.44%; while by increasing the number of inner ports from 9 to 15, the thermal efficiency increased by 0.22%. The development of high pressure gas burners should focus on adjusting the degrees and number of inner and outer ports for the overall improvement of the thermal efficiency.

Abstract: This paper presents the “Data arrays of the scanning sides coupling by laser” algorithm. This algorithm will find down the duplicate arrays by minima squaring method and couple the arrays. The coupling method will make the 3D scanning machine is more flexible and exactly.

Abstract: The present study is aimed at investigating the thermal conduction characteristics of a spaceborn sensor experimentally and computationally. The experimental measurement has been carried out in a high vacuum chamber with twenty selected thermal couples attached to the sensor module. The detailed internal thermal control design, material for heat release, temperature limit, and control logic of the sensor assembly have been described in the study. The total thermal resistance for the sensor has been evaluated from the experimental results of the steady state temperature distributions under a heat power of 5.5 W and the sensor heater power modulation has been obtained to keep the PT1000 within the accepted temperature range. Under the assumed temperature boundary conditions, the measured thermal resistances and the modulated sensor heater power, the maximum PT1000 temperature distribution is found to be 25.26 °C ± 3.44 °C with the finite element analysis. Heat loss has been evaluated for the invar mount of the sensor module. In addition, the overall orbit peak and average heater powers needed are 4.61 W and 1.61 W respectively.

Abstract: This paper is to demonstrate the application of modern Engineering Software to improve and advance the mechanical desig processes of a low beam projector headlight. Nowadays, advanced finite element tools are able to run and coupled different physics modules to analyze complex geometries and their material combinations. The particular issue in this study is the light switching mechanism in a headlight structure design. During lighting, the jam of the low beam projector solenoid actuated pivot due to thermal expansions has been distressing the normal operation of the overall headlight structure. A comparison between the original and a new convection enhanced head lamp design is therefore scrutinized. For both cases, heat transfer analysis, where it was included natural convection, conduction, and radiation with a concentrated heat source are proposed in order to obtain the temperature distribution fields at the light switching mechanism. The results were used to run future structural stresses analyses where the average thermal expansion of the crankshaft mechanism was determined.

Abstract: This paper presents a method for inspecting micro-holes with diameters of less than 100 μm using audible sound. The inspection system measures the micro-hole diameter by comparing two sound signals. Fluid flow through micro-holes affects the performance of products such as CO gas sensor parts, microphone filters and fuel injection plates. Therefore, if the flow rate of fluid passing through micro-holes is accurately assessed by an inspection system, the performance of a product can be guaranteed.

Abstract: Typical feature recognition algorithms in industrial applications are primarily used for solving cases where a feature locates on a single face only. A feature locating on multiple surfaces is quite common in real CAD models, but it has not been received extensive study yet. The reason is because the loop data in current B-rep model is limited to a face only. The aim of this study is to develop a method to search for all kinds of inner loops on a CAD model, including the ones within a face and those across multiple faces. These inner loops are called virtual inner loops because they do not exist in current B-rep model. Several realistic examples are also presented to illustrate the meaning and feasibility of the proposed method.

Abstract: On-machine measurement is used in ultra-processing machining, but it is seldom used in precision machining. For on-machine measurement, it is necessary that the sensor not be easily affected by the moving error or environment vibration in the field of precision machining. A triangulation method sensor with the optical skid method made using a new design concept is proposed to remove the moving error and vibration. The optical skid method used two laser spots with different sizes: the small spot diameter is the stylus and the large spot diameter is the skid [1]. The difference between these two signals reflects the surface shape. The developed sensor comprises an optical source and two optical receiving systems. Each optical receiving system has an imaging lens and a detector. Instead of two laser spots of different sizes, two detectors with different sizes of receiving area serve as the optical skid. Results confirmed the possibility of reducing the influence of the vibration using the developed sensor. In on-machine measurements, measurement of the surface profile with long wavelength is often necessary. If the spot diameter of the skid is not much larger than the surface profile wavelength, then the smoothing effect of the skid is reduced. Therefore, the amplitude of the measured profile by the skid sensor is smaller than actual amplitude of the workpiece. This paper presents a method of reconstructing the surface profile from the measurement results and the obtained effects of the reconstruction method from simulations and experiments.