Applied Mechanics and Materials Vols. 184-185

Abstract: Transmissibility is the main performance evaluation index of Metal Rubber (MR) isolator, which can be got by sine sweep frequency test. At different temperature, the sine sweep frequency test is done with different structural parameter MR isolator. The influence that relative density and pre-deformation have on transmissibility and natural frequency when temperature changed is analyzed. The changing regularity of MR isolator’s transmissibility at different temperature is explored. Research results provide the basis for designing MR isolator.

Abstract: This paper improves the existing pressure pipe rheological and resistance characteristic test system and optimizes the pressure and flow data acquisition method. Taking coal slime as an example, it conducts an experimental study on dense paste's rheological characteristics. It ensures the coal slime's rheological model transported in different pipe diameter of which the volume concentration is 57.06%～45.44%and analyses the rheological characteristic trend changing with diameter and volume concentration. The experiment proves that the new system is practicable and easy-operated and reliable. Also the original experimental data and processed result are in accordance with theoretical regulation.

Abstract: By setting contact sets, achieved overall analysis results of the mechanical properties with omni-direction side-loading forklift truck lifting system based on COSMOSWorks. And made an experimental measurements to omni-direction side-loading forklift truck lifting system by electrometric methods. There was a good relevance between experimental data and calculation values, and the deviation was basically within the 10 percent allowed. Finally, in this way it verified the correctness and reliability of the finite element analysis by experimental measurements. Ensured the omni-direction side-loading forklift truck lifting system could be safe and efficient to work. And also it laid a foundation for subsequent structural optimization.

Abstract: Premixed abrasive water jet abrasive tank has always been under static load in the course of their work, belonging to the pressure vessel. In view of the importance of the pressure vessel safety issues, the traditional design was conservative, and the shell is relatively thick and heavy. This paper uses simulation (finite element analysis module in solidworks)to do finite element analysis of the abrasive tank. In guarantee under the condition of its strength, reducing the shell weight of abrasive tank as much as possible can help to achieve the purpose of lightweight design and saving energy, reducing cost and price.

Abstract: Stamping process is a complex system, in the case of determined sheets, whether it can produce qualified parts has a great relationship with the setting of mold process parameters. Therefore, whether it is reasonable, the structure parameters of the parts are directly related to the forming quality of sheets. This paper uses the finite element numerical simulation, by setting different process parameters for single-factor simulation study, combines with the designers’ experience and repeats simulations to find the appropriate range of factors, and to obtain the optimum process parameters, thereby reducing repeated mold testing and repair costs, shorting the development time of new products.

Abstract: In this paper, a certain B737 aircraft fuselage section was used to research the influence of different impact conditions on fuselage dynamic characteristics. A finite element model of fuselage was built up from FS380 to FS500. The impact responses of fuselage subjected to 9.133m/s vertical velocity were analyzed under the conditions of 0° roll angle, 10° left roll angle and combination acceleration. The differences of transformation and acceleration history curves under different conditions were compared. The research results show that the performances of 10° left roll angle will change fuselage transformation and acceleration of seats location, the appears of combination acceleration will increase transformation of floor and decrease acceleration at the seats location. The crashworthiness of aircraft structure can be effectively improved by selecting the appropriate landing way.

Abstract: Aimed at the actuality of the Mine-Concentrator, Dexing Copper-mine, the paper comprehensively apply such technology as the statistics analysis, the forecasting theory, the pattern recognition, the neutral networks and the expert system etc, to study the intelligent method of wear condition and lubrication condition. An improved BP algorithm was presented, based on this an automate wear condition recognition model and its system was designed. The example shows that this system can promote the accuracy of wear condition recognition and improve the generalization capability. After all the problems were solved properly, wear and lubrication condition of the equipment were guaranteed as well. Therefore, the monitored equipment was running very well that year.

Abstract: The paper simulates the airflow in the microenvironment of negative pressure isolation cabin for the infectious disease patients. The result shows that the proper setting of such parameters as air inlet, air outlet, fan flow rate, and differential pressure control can effectively discharge the contaminated air out of the tank after the air is efficiently filtered. During the cabin ergonomic evaluation experiment based on different negative pressure values, the temperature and humidity rise slightly compared with the external environment but there is no obvious accumulation. Besides, the human life indication is consistently kept in the normal range.

Abstract: In order to inspect the working condition of the tension adjustment system of the marine hydraulic combined mooring windlass, the cable tension simulation device was established which is composed of the double-acting cylinder with electro hydraulic control. The simulation models of the cable tension simulation device and the cable tension adjustment system were set up in AMESim software. The simulation results of both models are verified by the experiments. The response of the tension adjustment system to the cable tension variation caused by the sea-wave is observed. The adjustment delay and maximum cable tension are obtained. The research in this paper provides the method to check the performance of the mooring windlass in the lab and provides the base for further optimization study on the dynamic response characteristic of the mooring windlass.

Abstract: In order to improve the reliability of a planet carrier, a simulation method based on multi-objective design optimization was developed in this paper. The objective of the method was to reduce the stress concentration, the deformation, and the quality of the planet carrier by optimizing the structure dimension. A parametric finite element model, which enables a good understanding of how the parameters affect the reliability of planet carrier, was established and simulated by ANSYS-WORKBENCH. The efficiency of the design optimization was improved by using a polynomials response surface to approximate the results of finite element analysis and a screening algorithm to determine the direction of optimization. Furthermore, the multi-objective optimization was capable of finding the global minimum results in the use of the minimum principle on the response surface. Computer simulation was carried out to verify the validity of the presented optimization method, by which the quality and the stability of the planet carrier were significantly reduced and improved, respectively. The methodology described in this paper can be effectively used to improve the reliability of planet carrier.