Papers by Keyword: Finite Element Analysis (FEA)

Abstract: Bucket wheel stacker-reclaimer is widely used in the field of material engineering machinery. Because of its working environment is very bad, it has higher requirements on its safety and reliability. Wind load calculations are necessary to ensure of the Static mechanical behavior. This paper mainly studied the main steel structure in a condition of no-load and maximum load work conditions and add the effects of the wind whose speed is about 20 m/s, At last all the stresses and strains were calculated based on FEA method.

Abstract: According to the recent rise in oil prices, interest in FCC Unit (Fluid Catalytic Cracking Unit) energy recycling is increasing. Such FCC Unit is a facility which refining low-valued bunker C oil into high-valued gasoline. Pressure vessel that refines crude in FCC Unit needs various interpretation because it operates under high-temp and pressure. Our concern about this FCC Unit is increasing. Experiments about its safety is not enough. In this paper, whether FCC Unit has structural stability or not, we found out FEM(Finite Element Method) analysis after trying 3D modeling by using FCC Units condition of design and critical stress as a translating data. First, we researched the safety of structure applying external factors using the natural frequency. The structure is safe from modal analysis result, the first natural frequency is 13.614Hz , beyond the of the frequency range of the wind (0.001~8Hz) and earthquake (0.1~10Hz).

Abstract: A metalized FBG pressure sensor encapsulated by dual bellows structure was designed based on the strain characteristics of optical fiber Bragg grating (FBG) and osmotic sensing principle. And the experimental system of dual bellows FBG pressure sensor is established. The experimental results show that the pressure sensitivity coefficient of dual bellows FBG pressure sensor is 184.98nm/MPa with the measuring range 10 kPa. The correlation coefficient is better than 99.9% and the resolution is up to 0.05% full scale (FS). The sensitivity of dual bellows structure is high, which indicate that the dual bellows structure encapsulation is suitable for the sensoring in small measuring range.

Abstract: Actual reflector antenna always has a deformation which has a serious influence on antenna performance. Establishing the equation of the distorted reflector surface is important for calculating antenna performance and precise control. A new best-fitting method based on least square method is submitted in this paper. This method depart from the ideal parabolic equation, and use the distance between the deformation point and the correspondent fitting point to establish the least square error condition equations, though which the six parameters can be got to determine the geometry position of the deformed parabolic accurately. Matrix operation can make the algorithm easy to realize in computer. Nan-shan 25m antennas finite element model is established in ANSYS program, and its result is analyzed compared with another method, confirmed the operability and accuracy of this algorithm.

Abstract: A novel flux switching external rotor doubly salient permanent magnet (DSPM) motor was researched. The two-dimensional model of the motor was established by Ansoft motor design software and the effects of air gap length and rotor pole arc on motor performance were discussed. The simulation results show that larger or smaller air gap length and rotor pole arc improve the torque ripple rate, but the increase of air gap length is helpful to enhance the overload capacity. The conclusions of this article have positive significance for improving the motor performance.

Abstract: The development of parametric calculation module program based on APDL, the completion of 3D acoustic modeling of a ship floating cabin, the selection of constraints according to the actual work situations, the finite element modal analysis of the overall cabin in the ANSYS environment and comparative analysis of a low-order vibration frequency of the cabin under different fire ratings. Acoustic calculation program of the fluid-structure interaction is used to analyze harmonic sound field and verify the impact of different thickness fireproof rockwools on the cabin acoustic performance. Parametric Design and Finite Element Analysis are combined to achieve the adjustment of the structural parameters of the complex models, automatically generate solid models and complete finite element analysis, which is important for the optimization of the acoustic design of the ship cabins.

Abstract: In order to accurately measure and trace micro-force, a micro-force calibration device is designed. According to the principle of electrostatic force reproduction, a coaxial cylindrical variable area capacitor is designed. Through the balance between the standard weight and micro-force generated by micro displacement of the two electrodes, the micro-force be measured for traceability. Electromagnetic finite element method analysis results show that the improved capacitor has little effect on micro-force and applicable to the device. The calibration principle and device to the micro-force standards establishment, traceability and transmission is of great significance.

Abstract: Based on finite element analysis technology, a static simulation model of the swing-rod constraint reciprocating piston-type oil-free air compressor was established for stress analysis of the compressor. Simulation results show that the stress in the main parts of the new compressor is within the permitted range, so structure design and parameter setting of the compressor are reasonable. Moreover, the force condition of seal rings is improved by adding swinging-rod constraint mechanism, which will prolong the service life of seal rings. With this study, these simulation results will guide further modification and performance improvement of the compressor.

Abstract: In this paper a finite element analysis (FEA) of machining for AISI1045 is presented. In particular, the thermodynamical constitutive equation (T-C-E) in FEA is applied for both workpiece material and tool material. Cutting temperature and tool wear depth are predicted. The comparison between the predicted and experimental cutting temperature and tool wear depth are presented and discussed. The results indicated that a good prediction accuracy of both principal cutting temperature and tool wear depth can be achieved by the method of FEA with thermodynamical constitutive equation.

Abstract: The electrode layout determines the piezoelectric performance of quartz resonator and directly affects the precision of the quartz VBA. We presented a novel monolithic differential quartz VBA with optimized electrode layout and solved the lock-in problem due to mechanical coupling. Based on the mass-equivalent system, an analytical model was developed and the uncoupling condition of the monolithic differential quartz VBA was deduced. Then we proposed five different electrode layouts and the optimum one was determined via simulation of piezoelectric and harmonic characteristics of quartz resonator with ANSYS. As a result, the mechanical coupling can be eliminated and at the same time, ±100 g measurement range and 80Hz/g scale factor can be achieved. The optimum electrode layout can drive quartz resonator in the desired modal. The presented device with advantages of miniaturization, low mechanical coupling, none assembly errors and high electromechanical coupling efficiency is very promising in the high-precision quartz VBA.