Advanced Materials Research Vols. 821-822

Abstract: As a result of turbulence and wide flow velocity range, flow velocity in engine intake manifold cannot be tested directly by using a thermal flow sensor. In this study, a sampling flow channel is designed according to the testing conditions and range of the thermal flow sensor. The flow velocity in the whole intake manifold was simulated by the finite element method software program. was found proportional to , and slope K was constant. ranged from 0 m/s to 4.8 m/s at the suitable outlet position of the sampling flow channel, which could be tested for the thermal flow sensor. The mass flow intake manifold was obtained by testing the mean flow velocity in the test section of the sampling flow channel .

Abstract: Choose ductile cast iron and chilled cast iron, bainitic cast iron three kind of roll materials, respectively, after different heat treatment process, on the roll body interception stress ring specimen, determine the roll internal residual stress. Theoretically proved that the stress ring specimen stress calculation formula is derived. Determine the stress components that exist in the roll. Test results show that the effect of processing condition to eliminate stress. Residual stress in the roll in different material and different heat treatment states difference is larger.

Abstract: The learning and interchange of the research workers in mechanical engineering field is very difficult because the high error probability and difficult understanding in the degree of freedom calculation about the rigid-flexible hybrid mechanism.In this paper,the pairing and mechanism characteristics of flexible mechanism have been firstly researched based on the kinetic characteristic of flexible mechanism.The degree of freedom calculating method of the flexible mechanism has been provided.This method is then expanded to the degree of freedom calculating of the rigid-flexible hybrid mechanism.The above methods are correct and validity by some examples testing.and it can efficiently support the design concept verifying.

Abstract: Geometric methods and mechanical principles were employed to study the kinematic variables and dynamic variables of eccentric circle cam mechanism, and their formulae were also given. The deductions show that the linear velocity and the acceleration of the driven member and the driving moment are all functions of the rotation angleand the rotation angular velocity of the cam, the numerical results of the given example verify the conclusions.

Abstract: This paper describes the three dimensional measurement of facial feature points. The nostril part was picked up as a feature point. The humans face was observed by the stereo-camera in real time. The depth position of the nostril was derived by the binocular parallax between the detected positions of the two cameras. Here, a new detection method for a nostril was suggested. First of all, the binalization image obtained from the stereo-camera was changed to the connection ingredient by processing labeling. Next, the system narrowed down the candidate of the nostril as a facial feature point by checking the geometric characteristics such as size, the center of gravity every ingredient. Furthermore, the skin color around the nostril was utilized to enhance the detection system.

Abstract: The dielectric spectrum of cotton fiber aggregation was tested with broadband dielectric spectrum measurement system in this paper. The relationship between the real part of permittivity and the bulk density of cotton fiber aggregation was then analyzed with least squares method. Experimental results show that, there is nearly a linear relationship between the real part of permittivity and the bulk density of the fiber aggregation at the frequency ranging from 100 kHz to 20MHz when the fiber aggregation was introduced into a parallel plate capacitor with constant volume. Moreover, for the dielectric constant measurement of cotton fiber aggregation, the measurement frequency should be greater than 100 kHz in order to decrease the measurement error.

Abstract: Thermoplastic self-reinforced polyethylene (PE/PE) composites were tested under quasi-static tensile load and the failure processes weremonitored by Acoustic Emission (AE) technique. The AE signals were collected and clustered by Unsupervised Pattern Recognition (UPR) scheme. The initiation and progression of the damage mechanisms in the composites can then be reviewed by the cumulative AE hits of each cluster versus strain curves. But the labeling of each cluster is crucial to the failure analysis. The paper focuses on this correlating between the obtained clusters and their specific damage modes. This was carried out by waveform visualization and Fast Fourier Transform analysis. Pure resin and fiber bundles were tested to assist in the labeling of signal classes in the composites (90°, 0° and [±45°] specimens). Typical waveforms of matrix cracking, fiber-matrix debonding, fiber fracture and fiber pullout were indentified respectively. The evolution process of various damage mechanisms in the composites revealed that the correlating method was effective. An objective and repeatable analytical procedure is established for the investigation of progressive failure mechanisms in the thermoplastic composites.

Abstract: In the paper, some properties related to characteristic function of a fuzzy variable are discussed based on uncertainty theory.

Abstract: Gear drive systems have been used widely in mechanical power and motion transmissions, and their mechanical properties and working performances such as vibrations and noise caused by high-speed and heavy-load could influence the whole machines quality. In a traditional analysis, in order to research the effects of different random errors, on gear drive systems vibration and noise we need to do multiple repetitive physical tests, which will take lots of time, labor and financial input to acquire. On the contrary, virtual reliability tests developed recently can take place of the physical tests to analyze the systems dynamic characteristics accurately sometimes (reduce the cost and raise efficiency). In this paper, ADAMS/APDL technology combined with Pro/E software is a successful method to build a total coupled parametric virtual test model of the gear drive system; subsequently, every parts dynamic characteristic curves and data are obtained conveniently, and these will be meaningful for further analysis of the relationship among inputs, systems, and responses.

Abstract: The paper mainly introduces a new apparatus (CHES-FY) to measure fabric surface friction. Compacted with the KES-FB system, the CHES-FY system has its own superiority. Through designing orthogonal tests, corresponding properties of 16 groups fabrics were measured by CHES-FY system. Based on the correlation analysis between KES-FB system with CHES-FY system, it indicates that the two systems have high correlations. Thereafter, regression equation that includes four parameters through multiple linear regression were achieved. It reports that CHES-FY system is feasible and accurate in measuring fabric surface friction performance.