Advanced Materials Research Vols. 230-232

Abstract: Higher vocational education is a new educational mode different from the traditional academic education. It is employment-oriented under the guidance of the government. It is targeted to “develop senior skillful human resource.” Therefore, vocational education not only requires students to have a good command of certain skills, but also certain high technology and innovative ability. It is required to view the active involvement of the students from the point of competence education, properly deal with the relation between the teacher and the students, transform a knowledge lecture class to a research class and inquiry class, and develop the potentials and abilities of the students.

Abstract: The contribution focuses on teaching and innovation for Sustainable development. Teaching the theory on the basis of the practical experiences envisages sustainable development planning as a process of continuous improvement. The article shows an optimization of recycling of concrete from lightweight aggregates containing expanded glass and hard rubber. The purpose of this work was to produce the new combination using rest, construction waste of concrete from lightweight aggregates and hard rubber and new raw components of concrete from lightweight aggregates, as key reactive material.

Abstract: This article attempts to provide a general review on the most widely used prediction modeling of pipes breakage and reliability. The intention of this review is to lay the historical improvement stages of this topic, to identify the previous challenges faced the researchers, to identify the malfunctions of the methods and techniques, and clarifying the limits of each technique. In addition, how the researchers could overcome the malfunctions and what are the deficiencies identified so that solutions can be suggested.

Abstract: This paper presents the environmental impact of manufacturing in several important aspects. Resume green manufacturing is the only way to sustainable development and green manufacturing technology trends and prospects.

Abstract: The vehicle crash acceleration curve is an important measured data which can represents a time history response of a vehicle during an impact test. To investigate the crash acceleration curve not only can realize the dynamic response and energy change of the impact process, but also able to assess the severity of occupant injury during a crash. The side-impact crash acceleration curve was investigated in this study. The characteristics of the measured crash curve of vehicle impact test can be analyzed to discuss the effect of the crash curve shape on the occupant injury. The shape, amplitude and duration characteristics of curve were discussed herein. Furthermore, a better curve shape to effectively reduce occupant injury was proposed. The trend of curve shape obtained in this study could help evaluate vehicle crash safety and guide the future development of safety technologies.

Abstract: On the basis of analysis of research on embedded soft hardware collaborative design method, image processing SOPC collaborative design principle is elaborated, relation between complicated algorithm time and soft hardware implementation and the implementation method to accelerate algorithm by multi-processor and multi-core is studied, thus the logical relationship between equipment IP core on the chip with Fast Simplex Link(FSL) bus and bus bridge, connecting conditions and application flow is organized. Finally, design SOPC, for which, multi-core and multi-processor collaborative work with the core of PowerPC 405 processor by taking flexible workpiece path (FWP) image as an example. The test manifests that the computation speed of SOPC designed in this passage is higher 10 times than that of common single-core SOPC in terms of image processing computing, effectively solving the problem of slow speed for computing image preprocessing by software in the embedded system.

Abstract: The temperature field in the adhesively bonded single lap steel joint after a thermal shock (100 °C, 10s) and the influence of the restraint on the thermal stress in the joint was investigated using elasto-plastic finite element method (FEM). The results showed that the temperature in the overlap region is symmetrically distributed to the bondline after the thermal shock. Five kinds of constraints were applied in the study and it is found that the peak value of the thermal stresses were occurred at the points near the free ends of the adherend lap zone along the mid-bondline under the action of constraining the adherends in the direction of both transversal and longitudinal. The symbol of the longitudinal stress Sx and peel stress Sy is negative.

Abstract: The effect of the adhesive thickness on the impact toughness of the adhesively bonded steel joint under impact loading is studied using the experimental method. The results obtained show that the impact toughness increases when the adhesive thickness increased then it decrease as the adhesive thickness increase. When the curing time is set as a constant, the higher the curing temperature is, the lower the impact toughness of the joint. The optimum thickness of the adhesive layer for the specimen of impact toughness test cured at 60 C for 1 h is 0.6 mm and it is 0.4 mm to 0.6 mm for the specimen cured 1 h at temperature of 90 C or higher than it. It is recommended using the notched specimen to decrease the testing deviation.

Abstract: This article introduces the recent research of SuperLU algorithms and the optimal storage method for [1] the sparse linear equations of coefficient matrix. How to solve large-scale non-symmetric sparse linear equations by SuperLU algorithm is the key part of this article. The advantage of SuperLU algorithm compared to other algorithms is summarized at last. SuperLU algorithm not only saves memory space, but also reduces the computation time. Because of less storage needed by this algorithm, it could solve equation with larger scale, which is much more useful.

Abstract: In this paper, a simplified drive train model with stick-slip nonlinearity is introduced for the study of stick-slip motion between the driving tires and the flywheel. Laboratory based tests are designed to investigate stick-slip motion of the tires contacting with the flywheels which simulate vehicle inertia. A description of the powertrain test rig, the associated instrumentation, the test inputs and operation conditions are provided. The experimental results are similar to those obtained from the numerical analysis using the introduced drive train model. They verify the validity of the stick-slip model, and demonstrate that stick-slip occurred frequently between the driving tires and the flywheels. The normal tire force applied to the flywheel is one of the key parameters affecting stick-slip motion. And there exists an upper limit beyond which the tire and flywheel will stick together at all time. It is found that the frequency of stick-slip motion is independent of normal tire force and is close to the natural frequency of the tire-flywheel contacting power transmitting system.