Applied Mechanics and Materials Vols. 236-237

Abstract: Based on the principle of integral circuit and thermal element, the present study considers the application of 80C51 single-chip micro-computer into the design of intelligent temperature control system. In this paper, the main approach is to make the ambient temperature change in accordance with the pulse width variation. The process is realized through the integral circuit consisting of the thermal resistor, capacitor and operational amplifier. In this way, with the pulse width measurement, we can detect the ambient temperature as well as control the external circuit. The experiment indicated that the system simplifies the temperature measurement with high reliability, great convenience and wide applications.

Abstract: Materials failure cases are typical examples of failed materials or components during their service. Statistical data of failure cases is very important to improve the design and maintenance strategy. Usually statistical data of failure cases is manually collected and analyzed by domain experts, because this procedure needs sufficient domain knowledge. It is a time-consuming task. This paper proposes a novel method to automatically get statistical data of failure cases aided by ontology. An application of failure case statistics in nuclear power plant is also described. Through the application result, the method shows that it can obviously improve the efficiency and precision of data statistics. Based on the statistical data, case analysis is easily made by researchers and engineers to assess service safety and improve the design and maintenance strategy.

Abstract: The tracking servo control has played an important role in the data storage servo systems. In the next generation optical data storage systems, i.e. the near-field recording system, the tracking error of the servo system should be below 10 nanometers under various unknown situations. However, higher data transfer rate and higher data density make it difficult to maintain the desired tracking precision during normal disk operation. It is proposed in this paper to use an adaptive regulation approach to maintain the tracking error below its desired value, despite unknown track eccentricity and external force disturbance. The performance of the proposed control approach is analyzed and simulation results are presented to illustrate the capability of the proposed adaptive regulator to achieve and maintain the desired tracking precision.

Abstract: In this study the effect on quality measurement introduced by input precision of instrument in image digitizing process was verified through a series experiment. Two categories of samples, which were outputted by EPSON Stylus Pro7880c digital inkjet printer and Xerox DocuColor5000 digital xerographic printer individually, were transformed into digital image with a normal flatbed scanner in 600 DPI, 1200 DPI and 1600DPI resolution. The area quality attributes such as graininess, mottle, NPS and banding were surveyed and analyzed with the aid of PIAS™-II personal image analysis software to investigate the stability of normal instrument used in digital prints measurement system. Results show that precision demands are different for various quality parameters and different application backgrounds, namely it is precise enough for common industry detection which has lager tolerance, but higher resolution does good to more effective and more precise measurement especially in R&D.

Abstract: This paper presents an underwater object detection and localization system based on multi-beam sonar image processing techniques. Firstly, sonar data flow collected by multi-beam sonar is processed by median filter to reduce noise. Secondly, an improved adaptive thresholding method based on Otsu method is proposed to extract foreground objects from sonar image. Finally, the object’s contour is calculated by Moore-Neighbor Tracing algorithm to locate the object. Experiments show that the proposed system can detect underwater objects quickly and the figure out the position of objects accurately.

Abstract: In this paper, we develop a novel algorithm that determines the overall best parameter setting in design of experiments. The algorithm begins with successive orthogonal array experiments and ends with a full factorial experiment. The setup for the next orthogonal-array experiment is obtained from the previous one by either fixing a factor at a given level or by reducing the number of levels considered for all currently non-fixed factors. We illustrate this method using a light-gauge steel wall sound isolation system with four parameters, each with three levels. In previous work, the full factorial of =81 experiments was conducted and the best parameter settings was found. With the proposed algorithm, we found the same result using 15 experiments. As a further comparison, we obtained the optimum using a traditional Taguchi method, and found it corresponded to the of the 81experiments when sorted by the objective (or quality) function. We conclude the proposed algorithm would provide an accurate, fast, and economic tool for global optimization of design of experiments.

Abstract: Aiming at the requirement of technique improvement for the flow meter verification equipment, the image acquisition and processing technology is combined with the embedded Linux system for obtaining the reading value of the verifying flow meter. A low-cost and moderate function image acquisition and processing embedded system was designed. The system runs on the ARM9 which is embedded with Linux operation system. It can realize the image acquisition of the reading value of the meter, image preprocessing, character positioning, segmentation and recognition based on OpenCV advanced programming, and then display the recognized data results. The research of our project may have a certain reference value for the application and exploring of the image acquisition and processing based on embedded systems in the instrument application.

Abstract: In this paper, three-dimensional plug valve was created. The function of virtual assembly was achieved using virtual reality modeling language. Network virtual assembly can operate, browse and assemble plug valve remotely by embedding virtual assembly in web pages. The virtual assembly method presented in this paper can be easily extended to deal with many other problems in complex engineering system if control parameters are modified properly.

Abstract: Alumina (Al₂O₃) cutting tools have been coated with carbon coating using physical vapor deposition (PVD) to improve its wear resistance. The cutting tools were subjected to surface pretreatments namely blasting and acid etching to improve the coating adhesion onto the substrates. The effects of pretreatments on the cutting tools topography prior to deposition were investigated using atomic force microscopy (AFM) while the surface morphology was investigated using scanning electron microscopy (SEM). The rake angle of the coated cutting tool and surface roughness of the cutting edge were investigated using infinite focus microscope. The adhesion strength of the carbon coating was investigated using microscratch. This study shows that although the coating were deposited evenly on all samples, the cutting tool that was blasted prior to deposition has better adhesion strength when compared to acid etching and no-pretreatment.

Abstract: To analyze the steady-state temperature field, a three-factor orthogonal test was taken to study comprehensively how the load, speed and tire pressure can influence the tire temperature. The finite element simulation was carried out according to the uncoupled idea. Based on the single-factor analysis towards the speed factor, the actual convection coefficient of different boundaries was determined to calculate the steady-state temperature field at last. These analyses indicate that the tire temperature rise increase with the factor of load and speed, decrease with the increase of the initial tire pressure. The load has the biggest influence on the tire temperature rise, while the speed has the least. With the combination of steady-state temperature field and heat generation rate distribution, all these high-temperature regions can be explained clearly from the finite element perspective.