Applied Mechanics and Materials Vol. 681

Abstract: The working conditional model of schnable car has been established and the principle of lifting mechanism has been analyzed. By complex vector method, we analyze the kinematics of the lifting mechanism and get the position, speed and acceleration curves of relevant objects under the lifting progress. We have a static analysis on lifting mechanism, and get the relationship curve of the cylinder’s force and generator’s mass by mathematical Calculation. Kinematics simulation test is proceeded by ADAMS.

Abstract: Diesel fuel pressure wave inside Combination Electronic Unit Pump (CEUP) pipeline has been investigated using a 1D viscous damped mathematical model considering the effect of four key fuel properties including density, viscosity, acoustic wave speed and bulk modulus. Wave equation (WE) based mathematical model has been developed in MATLAB using finite difference method. Mathematical model results at various operating conditions of diesel engine have been verified by comparing with those of AMESim numerical model of CEUP and quantified through Root Mean Square Errors (RMSE) and Index of Agreements (IA). Dynamic variations of these fuel properties during fuel injection cycles have also been incorporated in mathematical model by utilizing empirical formulas. Predicted results show that simulated results which consider fuel properties dynamic variations as a function of pressure are more coherent to AMESim numerical model results.

Abstract: TK6920 boring and milling machine is an advanced multi-functional.processing.equipment. Its range of processing is wide and production efficiency is high. It is available for drilling, reaming, threading , milling and cutting trenches plane ; coupled with rotary table , the machine can also bore in opposite direction and multi-faceted process ^{[ 1 ].} Spindle box is one of the most important parts of milling and boring , which is mainly used to install the spindle structure and transmission parts . Spindle box requires not only sufficient stiffness and strength , but also a certain degree of vibration damping ability. Its precision and structural changes have a significant impact on the accuracy of machined parts , so the headstock structural analysis and optimization is necessary

Abstract: The effects of joints with clearance between Crankshaft and cycloidal wheel on needle pendulum gear drive in 2K-V reducer are considered by Virtual Prototyping. A comparative analysis reveals angular velocity, acceleration change and the loading conditions of the input and output components. Joggle force between Crankshaft and cycloidal wheel are also analysized. It is a convenient way for stiffness design of 2K-V reducer.

Abstract: High pressure (HP) fuel pipeline is one of the vital components of Combination Electronic Unit Pump (CEUP) fuel injection system besides pump and injector. Effect of four key fuel properties including density, viscosity, acoustic wave speed and bulk modulus on pressure wave profile has been investigated using a 1D viscous damped mathematical model. Wave equation (WE) based mathematical model has been developed in MATLAB using finite difference method. Dynamic variations of these fuel properties during fuel injection cycles have also been incorporated in mathematical model by utilizing empirical formulas. The results show that these four key fuel properties not only vary with the pressure during fuel injection process but also define the trend of pressure wave propagation inside HP fuel pipeline.

Abstract: Home coffee roasting becomes increasingly popular in recent years. Besides freshness, coffee lover can achieve personal favorite flavors and make it with fun. In this paper, a new coffee roaster development based on gas baking method is introduced. Premixed fuel and direct-fired baking technologies are adapted for increasing energy efficiency, in which premixed flame contacts the beans inside the vertical-rotated drum. Meanwhile, a touch screen controller with fancy human machine interface is also designed for presetting roasting modes, controlling the procedures of roasting, and/or storing recent roast profile for use at other time. Experimental results show that the proposed structure is eco friendly, enriches the energy efficiency, reduces the gaseous emission, and achieves a consistent roast.

Abstract: In order to the small gravity feed liquid system cold storage optimization, it is analyzed that the evaporator area in gravity feed liquid system is how to influence the efficiency of the system. The visual basic software is used to simulation. The influence of heat transfer coefficient, heat transfer temperature difference and refrigerating capacity is simulated with the change of the evaporator area of the refrigeration system. Through the experiment, the feasibility of the application software is determined. Also it is found that the reduction of 25% evaporator area can make the system work best under the condition of - 18 °C cold storage temperature.

Abstract: The present paper focused on both turbulent flow and laminar flow at low Reynolds number in a curved duct. The finite volume method on unstructured grid and SIMPLEC algorithm were adopted here and the computation program was design with these methods. Good agreement was achieved between the numerical result and experimental data in the literature, and it shows that the method is reasonable and the program works well. The numerical method was also used to flow simulation with different attack angle and side angle, and numerical results were consistent with conclusion in the literature. Finally, the numerical method used for cases with different Reynolds number at the inlet. Secondary flow phenomena have been researched in the curved duct and some conclusions were derived.

Abstract: In this paper, we propose a signal compensation algorithm. In heterodyne laser interferometer, the unexpected error restricts the precision such as nonlinearity and environmental error. To improve the accuracy in length measurement, we use the method of Lagrange multiplier which solves the constrained optimization problem and allows to minimize an objective function. With the method of Lagrange, we apply it to a length measurement and show the result of simulation.