Key Engineering Materials Vols. 474-476

Abstract: Absolutely grey number and grey function are important parts of grey mathemtics and the core is the covered operation. We defined absolutely grey number and proposed its covered operation, and the computational formula of grey power function is also obtained. The computable techniques may improve the human abilities to control the phenomenon of noise and vibration in real applications.

Abstract: Extension theory are widely used in many fields such as automation, manufacturing process, operations management and artificial intelligence. Dependent function is the core of extension set. In this paper, we construct the elementary dependent function on the single interval, i.e., the discussion field is the same as the positive one, and it includes finite and infinite ones, respectively. Some properties are also discussed. The proposed functions allow extension theory with a broader scope.

Abstract: In order to provide low power consumption LFSR seed for BIST structure，this paper proposed a seed calculation Methods of dynamic-pseudo-random test sequence, it can reseed for LFSR and cut off test sequence of the low fault coverage effectively. The seed can generation fixed length pseudo-random test sequence, the sequence reduce test time and number of test vectors mostly. Experimental results that this technique can reduce the length of vectors, shorten test time and low power consumption based on without reduce the fault coverage

Abstract: A new type standing wave ultrasonic motor is proposed in this study. In this design, three longitudinal vibration transducers are clamped on the inner side of a ring with driving teeth by screws. Bending standing wave can be generated in the ring by the longitudinal vibrations of the transducers. Thus, oblique linear simple harmonic vibrations are formed on the teeth, which can drive the rotor by frictional force. The structure and working principle of the proposed design are introduced. The motor is designed and analyzed by using FEM method. A standing wave is gained after the degeneration between the bending vibration of the ring and the longitudinal vibration of the transducer. The test results of the prototype motor verify the feasibility of the proposed design.

Abstract: This study analyzed the plantar pressure distribution character as the foot position between normal to inversion. Eight healthy male volunteers have participated in the test with the foot position from normal to 20 inversion angles which controlled by wedges. The results of this test showed that the centre of the pressure was clearly transferred from centre to lateral side when the foot position was changed from normal to inversion. In addition, the contact area varied largely between the normal and inversion condition, but changed a little between two inversion loading situations. The finding of this study suggests that the foot injuries could attributed to more of inappropriate foot positioning than the magnitude of loading force.

Abstract: Torsional vibration of drive shaft has a great influence on the floor vibration, Rational arrangement of phase of multi-universal coupling can attenuate vibration. Accord to the vibration of the floor of one light bus, theoretical model has been established and Optimization program has been operated .The results of test validation and simulation show that the optimization scheme is effective and reasonable.

Abstract: The automotive body system is not only a source for directly radiating noise into the vehicle interior space, but also a key component for transmitting various vibrations and noise. The optimization of the modes for body-in-white has significant meanings for improving the reliability and NVH (Noise, Vibration and Harshness) performance of the whole vehicle. Based on the current situation that there is more severe interior vibration and noise problem occurring in driving for a light passenger vehicle, a hybrid modal analysis method combined with experiment and simulation methods is applied to investigate the vibration and noise characteristics of the whole vehicle body. By performing such modal analysis, the modal frequencies of the auto-body are improved effectively by strengthening the vibration sensitive regions in the body structure. The experiment for measuring interior vibration and noise levels under cruise condition is conducted to validate that the structural optimization for body-in-white has significant contribution for improving the whole vehicle NVH performance.

Abstract: Urban land use suitability evaluation is the basic work of urban land use planning and management. The evaluation method is a core in urban land use suitability evaluation. Traditional urban land use suitability evaluation methods are GIS-based methods which often can not get satisfactory results for the complex nonlinear urban land use system. Artificial neural network is a frontier theory of complex non-linearity scientific and artificial intelligence science. It is a new method to evaluate urban land use suitability. This paper took the land use suitability evaluation of Hefei city as an example, building a back propagation neural network with 8 neurous of input layer, 5 neurons of hide layer and 3 neurons of output layer. The analysis shows: the high suitability area is 682.27 km² in Hefei city, being about 8.73% of the total study area; the middle suitability area is 5965.76 km², or about 76.33% of the total area and the low suitability area is 1167.35 km², or about 14.94% of the total area. The results reflect the actual situation in Hefei city. The study shows that the back propagation neural network model can overcome the shortcomings of traditional evaluation methods. It means that artificial neural network is suitable for urban land use suitability evaluation. This reflects that artificial neural network has great academic value and application prospect in urban land use suitability evaluation. It also reflects that this study can provide a new idea and method for urban land use suitability evaluation.

Abstract: The effect of three different types dispersants on the stability behavior of alumina aqueous suspension were investigated by through sedimentation experiment , Zeta potential ,and residual porosity of sintered sample. The results showed that the optimal content and optimal sedimentation pH value of the three different types dispersants were 1.0% and aging at pH9 for PAA-NH₄, 0.8% and nearly independent of pH value for Arabic gum , 0.4, 0.2 and aging at pH9 for PAA-NH₄ and Arabic gum，respectively. The dispersion effect of the three different type dispersants was PAA-NH4 and Arabic gum> PAA-NH4 > Arabic gum. Studies have shown that the combination of PAA-NH4 and Arabic gum has a better effect than one of them on the stability of suspension. Compared with single dispersant, the sedimentation volumes of the two dispersants dispersing suspension is reduced 3%, the dosage of dispersants is reduced 26.7%.

Abstract: Under the guidance of DBC theory, a new architecture, called Integration Testing Architecture for Contract-Based System (ITACBS) is proposed in this paper. The ITACBS fully considers the characteristics of the component software, using the component interface of the contract document to describe the behavior of the system components.The aim of the ITACBS is to found the error between the components and the paste code and to achieve Integration Testing by monitoring and inspection contract. Compared with traditional method for packaging component,the method which used the ITACBS overcomes the non–state tracking of components caused by the unknown source.Test results show that the component wrapper can provide better testbility than other methods.