Applied Mechanics and Materials Vol. 487

Abstract: By measuring the nail holding power used in the decoration of bamboo integrated timber, analyze the influence of bolt category,diameter of guiding bore and screwing depth. The results show that the bolt joint strength of bamboo integrated timber was obviously increased in usage with the decreasing of diameter of guiding bore and the increasing of screwing depth.

Abstract: The transverse distribution of lane loading is one of the most concern for the assembly prefabricated T-girder bridges. Longitudinal influence line and transverse distribution coefficient are used in the traditional calculation method of lane loading effects. But, many research results show this method brings a little big error because of the simplification. Along with the advance of computer technology in mathematics, it is not difficult to use the 3D FEM model to calculate the inner force that caused by vehicle load in girder bridge. In this paper, some comparatively accurate 3D FEM models are established to analyze the lane loading effects on the simply supported T-girder bridge. The results show that the moment and shear force of each girder are quite different between traditional method and 3D FEM model. The results indicate that the traditional method in current code is non-conservative.

Abstract: The acceleration and force sensors are taken as the measurement parameter,vibration power flow analysis is conducted to the data collected using MATLAB software,the results show that validity of engine suspension vibration is intuitively judged using the power flow,it is a evaluation index,moreover,it is not only convenient measurement,but also the influence of phase difference between the measured parameters to vibration isolation effect is not needed consider.

Abstract: This paper proposes an approach to carry out sensitivity analysis of tool axis errors caused by component geometric errors, in order to meet the high precision requirement in holes series machining with mill-turn machine tools. Firstly, ideal kinematic model and real kinematic model considering geometric errors of the mill-turn machine tools are built respectively based on homogeneous transfer matrix and multi-body system theory. Secondly, tool axis errors caused by component geometric errors are simulated using an orthogonal test. Finally, sensitivity analysis of tool axis errors is implemented by means of range analysis and variance analysis.

Abstract: The idea of inertial propulsion using rotating parts is always attractive, but great controversy also exists. Some researchers even completely negate this idea in principle, they think it would never be possible to create directional movement by the inertial force. Theory and experimental results show that, in certain conditions, directional movement can be realized by the internal inertia force of the device. In this paper, the influence of the friction condition between the propulsion devices which using rotating eccentric mass to generate inertia force and the external supporting surface on the effect of propulsion has been analyzed. The results show that, when there is friction between the device and the supporting surface, the rotary of eccentric mass in the device will allow the device to produce motion in a given direction; if the parameters of propulsion device (eccentric mass and eccentricity) and the rotary speed of the eccentric mass are given, the friction condition between the device and the support surface will affect the characteristics of directional motion.

Abstract: The pipeline transportation industry has expanded significantly because of its convenience and speed, but it faces problems. This research is to study the failure of piping caused by a water hammer which is a behavior of the check valve when the pump stops working. This causes, a loud noise and the pipe is deformed due to vibration. Therefore, this research analyzes the deformation of the pipeline due to a pressure surge and measures the vibration of the piping system when the check valve works. The resulting analysis can be used to predict the phenomenon that can cause deformation of the pipeline. The principles of fluid structure interactions using the theory of fluid and theoretical mechanics with materials engineering are used to solve problems that occur at Khon Kaen Beer in Thailand. In this research, the modeling and analysis of the piping systems uses the ANSYS program and results show the predicted failures match those in actual pipelines.

Abstract: Cantilever excavator is widely used in fully mechanized mining face at present domestic coal mine, Its high efficiency, reliable working state is the promise of mine production and safety production. In this paper, using the mining vibration recorder for EBH300(A) roadheader vibration signal acquisition, and using MATLAB to analyze in the time domain analysis. Its useful to understand the vibration characteristics of roadheader work, and of important realistic significance for the tunneling machine structure optimization design and researching on fault diagnosis.

Abstract: The goal of the present research is to design a feeding safety apparatus of hydraulic press brake which can solve the problems of injuries of hands of operators while processing. The research method uses the contradiction matrix of TRIZ to find out the parameters which are to be improved and prevented from deteriorating and design a feeding safety apparatus with essential safety. The principle thereof is to use the driving lever and the supporting lever to generate synchronous movements; the operators do not need to extends both hands in the back of the press break mold, but can support the sheet metals in the front or the back of the press break mold; consequently, the injuries of both hands of the operators being pressed and clipped can be prevented.

Abstract: A Load-type Commercial Motor-vehicle of Passenger Transport was studied as the research subject in researching front crash safety evaluation technology of front structure by the real car crash test methods, which is to explore the front crash safety evaluation technology suitable for china's National conditions. The results show that the Testing procedure and Evaluation will not only conducive to the carrying out of Commercial Motor-vehicles of Passenger Transport access about structural safety detection, but also played an important role in promoting the safety of the domestic bus, road transport safety, and social harmony.

Abstract: A walker is used for the patient of weak or lack of balance and mobility. Such as the older adults after orthopedics operation, Parkinson's disease and cerebral palsy patients. But, It is dangerous when walkers are pulled up and easily feel sore on both arms of the user. We apply TRIZ theory to solve about problems. Our invention integrates the demands of stability and speed of walking. We add four ball bearings to the new spring structure. While needs moving, the user may push walker lightly via ball bearings. On the contrary, when needs sustainability the user just uses the gravity of his body to let balls get into the four anti-slip mats.