scholarly journals A Mechanical Modelling and Simulation Method for Resolving PIM Problems in Antennas

Sensors ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 294
Author(s):  
Chen Chen ◽  
Yangyang Gu
Keyword(s):  
Finite Element ◽  
Product Development ◽  
Structural Design ◽  
Nonlinear Distortion ◽  
Simulation Method ◽  
Design Phase ◽  
Root Cause ◽  
Element Simulation ◽  
Mechanical Modelling ◽  
The Stability

Passive intermodulation (PIM) generated from antennas is a nonlinear distortion phenomenon and causes serious problems to communication quality. Traditional radio frequency (RF) solutions focus on testing the final product to find the PIM source. However, it cannot solve the stability of PIM after the antenna is vibrated. This paper introduces a new method to improve the stability of PIM in the design phase. By studying the mechanism of PIM generation, a simulation method is proposed in this paper by applying mechanical finite element simulation and simulating the structural design of the device under test. Then, the stress at the PIM source is reduced, thereby the PIM stability of the product is improved. This paper adopts this method by studying a typical product, finding the root cause that affects the product PIM magnitude and stability, and optimizing its design. The PIM value of the new scheme is stable by making a prototype and testing. The method provided in this article can effectively improve product development efficiency and assist designers in avoiding the risks of PIM before the product’s manufacturing.

scholarly journals Analysis of Vertical Stiffness of Air Spring Based on Finite Element Method

2018 ◽  
Vol 153 ◽  
pp. 06006
Author(s):  
Jiatong Ye ◽  
Hua Huang ◽  
Chenchen He ◽  
Guangyuan Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Element Model ◽  
Simulation Method ◽  
Bench Test ◽  
Air Spring ◽  
Vertical Stiffness ◽  
Element Simulation ◽  
Element Method

In this paper, a finite element model of membrane air spring in the vehicle is established, and its vertical stiffness characteristics under a certain inflation pressure are analysed. The result of finite element simulation method is compared with the result of the air spring bench test. The accuracy and reliability of the finite element simulation method in nonlinear analysis of air spring system are verified. In addition, according to the finite element method, the influence of the installation of the air spring limit sleeve on its stiffness is verified.

The Study on Airborne Equipments Life Prediction Based on the Finite Element Simulation under Comprehensive Stress

2013 ◽  
Vol 365-366 ◽  
pp. 224-228
Author(s):  
Tian Ma ◽  
Chuan Ri Li ◽  
Shuang Long Rong
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Life Prediction ◽  
Single Point ◽  
Simulation Method ◽  
Distribution Fitting ◽  
Kinetic Experiment ◽  
Element Simulation ◽  
Vibration Stress ◽  
Equipment Lifetime

To predict an airborne equipment lifetime with finite element simulation method, use ANSYS and Flothem, respectively, to analysis vibration stress and temperature stress, corrected by kinetic experiment; then import the results into the failure prediction software-CALCE PWA, set the intensity and duration of stress according to its mission profile, finally get the component failure life prediction results under comprehensive temperature and vibration stress; extract the Monte-Carlo simulation data, use the single point of failure distribution fitting, fault clustering and multipoint distribution fusion method to get the board and the whole machines lifetime and reliability prediction. The design refinement suggestion of the airborne equipment is given at the end of the conclusion.

Research into Contact Interaction of an Elastic Tool during Rotational Pattern Cutting of Sheet Parts

2016 ◽  
Vol 685 ◽  
pp. 408-412 ◽  
Author(s):  
E.G. Gromova ◽  
A.G. Bakanova
Keyword(s):  
Finite Element ◽  
Mathematical Simulation ◽  
Elastic Medium ◽  
Design Process ◽  
Experimental Research ◽  
Simulation Method ◽  
Medium Pressure ◽  
Element Simulation ◽  
Deformation Processes ◽  
Simulation Results

The paper describes a method of pattern cutting of sheet articles using the elastic medium pressure. Research works have been conducted into feasibility of the suggested pattern cutting using finite element simulation method. The experimental research was conducted into deformation processes during rotational separating stamping of sheet articles by means of elastic medium pressure so that to confirm relevance of the mathematical simulation results. The optimum design process parameter value combinations have been determined for implementing the rotary pattern cutting process.

Influence of Vehicle Velocity and Wheelbase on Washboard Enhancement Coefficient

2014 ◽  
Vol 875-877 ◽  
pp. 1116-1120
Author(s):  
Wen Liang Li ◽  
Wei Zhou ◽  
Li Gao ◽  
Wei Liang Dai
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Finite Element Simulation ◽  
Simulation Method ◽  
Element Simulation ◽  
Vehicle Velocity ◽  
Study Results

With finite element simulation method, the fatigue life of vehicle front floor is analyzed in different vehicle wheelbases and velocities, and the washboard enhancement coefficient is calculated, then K-v curve, K-m curve and K-v-m surface are drawn, with which influence of vehicle velocity and wheelbase on washboard enhancement coefficient is studied. The study results show that, when the wheelbase is constant, washboard enhancement coefficient increases first and then decreases with velocity increasing, and reaches peak at a certain velocity; when velocity is constant, washboard enhancement coefficient decreases as wheelbase increasing; when velocity and wheelbase both changes, washboard enhancement coefficient varies in K-v-m surface.

An Engineering Correction Method for Buckling Load of Dense Stiffened Panels

2020 ◽  
Vol 1003 ◽  
pp. 92-97
Author(s):  
Wen Hao Liu ◽  
Rui Xiang Bai ◽  
Kang Su ◽  
Jian Chao Zou ◽  
Da Liu ◽  
...  
Keyword(s):  
Finite Element ◽  
Calculation Method ◽  
Engineering Calculation ◽  
Correction Method ◽  
Buckling Loads ◽  
Buckling Modes ◽  
Stiffened Panels ◽  
Element Simulation ◽  
Compressive Buckling ◽  
The Stability

It is convenient for designers to get the buckling loads of sparse stiffened panels quickly by using engineering calculation method to analyze the stability of composite stiffened panels, but it is still unable to meet the accuracy requirements of analysis of dense stiffened panels. The buckling loads of stiffened panels are closely related to the buckling modes. Based on capturing and analyzing the Compressive Buckling waveforms of T-shaped densely stiffened panels, this paper presents a formula for calculating the buckling loads according to the geometric coefficients. The results are very similar to those of finite element simulation, and can be used to calculate the buckling loads of sparse and dense stiffened panels with different stiffeners.

Finite Element Analysis of Creep Induced Volume Shrinkage of Salt Caverns

2013 ◽  
Vol 353-356 ◽  
pp. 1379-1385
Author(s):  
Ming Zhang ◽  
Shao Xin Zhang ◽  
Qiang Yang
Keyword(s):  
Finite Element ◽  
Oil And Gas ◽  
Volume Shrinkage ◽  
Salt Rock ◽  
Simplified Models ◽  
Element Analysis ◽  
Element Simulation ◽  
Storage Volume ◽  
The Stability ◽  
Salt Caverns

Salt rock is now being used widely as storage vault of oil and gas. However, the rheological properties of salt rock have significant influence on the stability of salt caverns and, in particular, induce the reduction of storage volumes. Therefore, the classical Nishihara model is used to describe the rheology of salt rock and incorporated into the finite element simulation firstly. Then the volume shrinkage is calculated for two typical simplified models with single cavern and double caverns. The results show that the storage volume of salt cavern decreases with the internal pressure and increases with service time for either single-cavern model or double-cavern model, which remains unchanged though the volume shrinkage of one cavern is influenced by others.

Riser Design of Cast System of Fused Zirconia-Alumina-Silica

2014 ◽  
Vol 633 ◽  
pp. 498-502
Author(s):  
Dao Yuan Yang ◽  
Min Xiao Ma ◽  
Ruo Yang Liu ◽  
Yue Chu ◽  
Yi Ming Yin ◽  
...  
Keyword(s):  
Finite Element ◽  
Temperature Gradient ◽  
Production Process ◽  
Production Cost ◽  
Volume Ratio ◽  
Simulation Method ◽  
Silica Material ◽  
Element Simulation ◽  
Riser Design ◽  
Residual Melt

Fused cast Zirconia-Alumina-Silica material (AZS) is the key refractory to glass furnace. In order to reduce production cost and optimize production process, the influences of riser position and riser size on temperature gradient, solidification time, residual melt modulus, solidification fraction, and cooling rate of cast system were studied by the finite element simulation method according to the brick size of 600 mm × 400 mm × 300 mm. It turned out that it would be more efficient in feeding when riser located at the center of maximum surface of a brick or when the height of riser is 250 mm-270 mm, while the volume ratio of brick to riser is 2.95-2.74, on condition that the size of riser upper surface is 450 mm × 450 mm and the bottom 150 mm×150 mm.

Influencing Factors Analysis on Comfort of New-Type Precast Assembly Diaphragm

2014 ◽  
Vol 578-579 ◽  
pp. 711-716
Author(s):  
Chong Fang Sun ◽  
Shu Ting Liang ◽  
Xiao Jun Zhu
Keyword(s):  
Finite Element ◽  
Natural Frequency ◽  
Influencing Factors ◽  
Evaluation Criteria ◽  
Simulation Method ◽  
Factors Analysis ◽  
Comfort Evaluation ◽  
Element Simulation ◽  
New Type ◽  
Design Proposal

The paper selected natural frequency and peak acceleration as comfort evaluation criteria. The author tested the new floor comfort under the human-induced loads. The author analyzed new floor comfort by selecting the worst possible scenarioes. The result indicates that the new floor satisfies the comfort requirement. The comparison of test value, theoretical value and finite element value of natural frequency proved that the finite element simulation was reasonable. The author analyzed comfort influencing factors of 7m×7m floor with the same simulation method and proposed a design proposal.

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