Applied Mechanics and Materials Vols. 128-129

Abstract: To solve the problem of increased resistance founded in prototype test for single traction articulated in-pipe robot inspecting system move inversely, a driving scheme with double driving in-pipe robots located in both ends of inspecting system has been put forward. For the deflection of hinge connection caused by the misaligned centroid position of each modular unit, the limited contact mechanics model between the modular unit and pipe wall is established, and the stability of movement of modular units moved in elbow pipe is analyzed by example. The simulation results verify the rationality of analysis process, to provide the basis for improving in-pipe robot inspecting system design.

Abstract: Our project focuses on the emotional face evoked EEG signal recognition. Since EEG signals contain enough information to separate different emotional facial expressions. Thus we propose a new approach which is based on global field power on EEG signal classification. In order to perform this result, firstly, we gather a dataset with EEG signals. This is done by measuring EEG signals from people aged 20-30 that are stimulated by emotional facial expressions (Happy, Neutral, Sad). Secondly, the collected EEG signals are preprocessed through using noise reduction method. And then select features by principal component analysis (PCA) to filter out redundant information. Finally, using fisher classifier and a 10-fold cross validation method for training and testing, a good classification rate is achieved when combination local max global field power EEG signals. The rate is 90.49%.

Abstract: A fault diagnosis based on bond graph model is proposed for hydraulic variable pitch system. Because the knowledge representation of bond graph model can provide information of cause and effect between components, a bond graph model of hydraulic variable pitch system is given above rated wind speed. A fault tree, using cause and effect analysis by back propagation, is developed. Qualitative value of parameters is assigned and the fault source is detected by analyzing boundary parameters of fault tree. Comparing with quantitative fault diagnosis based on model, the bond graph fault diagnosis is more flexible and has good completeness.

Abstract: Analysis for error in triangular laser measuring system of three-dimensional profile. Analysis of the basic principle of laser triangulation method, and setting up the geometric optics model. Study on errors caused by image processing, expounding errors change caused by system structure parameters in detail, and given the methods to eliminating or reducing the errors with different factors.

Abstract: On the basis of previous studies, various shape function and weight function of infinite element are researched and summarized into eight methods, and then various infinite element methods can be summarized as general equation, the condition number of various infinite element methods is researched to judge the merits of infinite method. Surface error of selected methods versus frequency and the node number are calculated in this paper. Finally, relatively optimal infinite element methods are summed up according error comparison, which helps to apply appropriate infinite method to solve boundary-value problems on unbounded domains.

Abstract: Based on the technology of virtual instrument, a set of measurement system of the total electric field on the ground level under HVDC transmission lines is developed. After the hardware and software system are built up, some tests are made in laboratory to show the validity of the system. Finally, experiment results are given and analyzed. The developed measurement system can be used to measure the total electric field on the ground level under HVDC transmission lines, and can provide support for the evaluation of the electromagnetic environment of the HVDC transmission lines.

Abstract: The paper investigated the efficient model of solar wall and the operation modes of solar wall system on buildings application, The construction of efficient solar wall was devised and experiment studied the operation effect. In order to find out the relationship between solar radiation and outlet air temperature, the air temperature change per unit solar radiation intensity (▽) was introduced. Study given: the system function or use of shade structures and architecture integration measures, relative to the building directly by the sun exposure, the surface temperature of building with the efficient solar wall can be achieved a more substantial cooling; the same time the system can be improved through natural convection air-conditioned room air quality will not result in excessive waste of energy. Solar radiation is the decisive factor in the process of heating air. to meet the requirement of indoor heating, the reasonable range of ▽ is 5.63-6.35, the optimum system wind velocity would be 3 m/s-7m/s.

Abstract: Ride comfort is one of the main using performance items and competitiveness index of the automobile. This paper carries out shock absorption performance experiment for a certain light truck cab suspension system to study the shock attenuation rate of the four suspension points of the cab when it is under no-load and full-load status running with speed of respectively 40，50，60，70，80 km /h, as well as under the idle speed status. The result shows that the shock attenuation rates of the front cab suspension points under various conditions are low. And the shock attenuation rate of the back cab suspension points at Z direction is low. Front and back cab suspension points have no attenuation to low frequency shock. It is suggested that the cab suspension rigidity needs to be re-matched.

Abstract: A balance scheduling method based on gasholder level prediction is proposed for the byproduct gas system in this study. First, a class of Gaussian process regression is presented to construct the prediction model, in which a conjugate gradient algorithm is then designed to optimize the model parameters. A reasoning calculation is designed to obtain the gas adjustment amount for the system balance that sustains the whole system security. To verify the quality of the proposed method, the practical data coming from Shanghai Baosteel are employed and the experimental results indicate that the prediction for gasholder level provides the scientific guidance for the energy utility.

Abstract: With increasing sustainable development consciousness, sustainable design plays an important role not only in design phase but also in manufacturing process. This paper proposes a modular design methodology for achieving sustainable design as well as fulfilling functional requirements. Factors related to function and sustainability of products such as material, manufacturability, component life and so on are defined as modular drivers. Design structure matrix, a structured method which has advantages on representing and analyzing interaction relations among system elements, is employed to establish correlation matrix between components. K-means algorithm is used to integrate the basic components into design modules based on their correlation distance. Furthermore, an evaluation model is established for assessing sustainability of modular products. Finally, a reduction gear is used as a case study example.