Dynamic Balancing Modal Analysis and Vibration Suppressing Design for Reciprocating Compressor Crankshaft

2012 ◽  
Vol 157-158 ◽  
pp. 996-999 ◽  
Author(s):  
Yi Cheng Huang ◽  
Fong You Lee
Keyword(s):  
Finite Element ◽  
Analytical Solution ◽  
Solution Method ◽  
Vibration Reduction ◽  
Modal Testing ◽  
Movement Trajectory ◽  
Reciprocating Compressor ◽  
Connecting Rod ◽  
Dynamic Balancing ◽  
Finite Element Software

The purpose of this study is to improve the problem of vibration which occurs in a running reciprocating compressor, by determining an optimal crankshaft counterweight and narrowing the movement trajectory of the crankshaft connecting rod mechanism. An analytical solution method is applied to satisfy the requirements for vibration reduction. Use of finite element software is to simulate the modality and deformation of crankshaft under various conditions of counterweight. Modal testing shows a difference of less than 6 % between the simulation and the experimental results. After the crankshaft counterweight is machined and installed, the new crankshaft is able to reduce compressor vibrations from 32 mm/s down to 15.8 mm/s and noise reduction of 3 dB. This study can provide information pertaining to the design process and assessment to any future new compressor designs.

Dynamic Motion and Modal Analysis Simulation for the Balance Mass of the Crankshaft of a Two-Cylinder Reciprocating Air Compressor

2014 ◽  
Vol 511-512 ◽  
pp. 696-699
Author(s):  
Yi Cheng Huang ◽  
Dain Yu Lin
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Inertial Force ◽  
Reciprocating Compressor ◽  
Connecting Rod ◽  
Air Compressor ◽  
Dynamic Motion ◽  
Finite Element Software ◽  
Simulation Results

The purpose of this study is to suppress the problem of vibration which occurs in a running two-cylinder reciprocating compressor. Determining an optimal crankshaft counterweight and narrowing the trajectory orbit of the crankshaft connecting rod mechanism is achieved. Use of finite element software (ANSYS) was used to simulate the modality of the two cylinders. In additions, the inertial force influenced to the crankshaft under different counterweight design was simulated. Simulation results by using SolidWorks software show the new counterweight was able to reduce the crankshafts eccentric by 4mm and the orbit trajectory by 10mm. This study provides the procedures pertaining to the bettering performance and assessment for an existing reciprocating compressor.

scholarly journals Theoretical analysis and experimental research on multi-layer elastic damping track structure

2021 ◽  
Vol 13 (2) ◽  
pp. 168781402199497
Author(s):  
Guanghui Xu ◽  
Shengkai Su ◽  
Anbin Wang ◽  
Ruolin Hu
Keyword(s):  
Finite Element ◽  
Analytical Solution ◽  
Finite Element Simulation ◽  
Reaction Force ◽  
Vibration Reduction ◽  
Vertical Direction ◽  
Propagation Path ◽  
Track Structure ◽  
Test Results ◽  
Element Simulation

The increase of axle load and train speed would cause intense wheelrail interactions, and lead to potential vibration related problems in train operation. For the low-frequency vibration reduction of a track system, a multi-layer track structure was proposed and analyzed theoretically and experimentally. Firstly, the analytical solution was derived theoretically, and followed by a parametric analysis to verify the vibration reduction performance. Then, a finite element simulation is carried out to highlight the influence of the tuned slab damper. Finally, the vibration and noise tests are performed to verify the results of the analytical solution and finite element simulation. As the finite element simulation indicates, after installation of the tuned slab damper, the peak reaction force of the foundation can be reduced by 60%, and the peak value of the vertical vibration acceleration would decrease by 50%. The vibration test results show that the insertion losses for the total vibration levels are 13.3 dB in the vertical direction and 21.7 dB in the transverse direction. The noise test results show that the data of each measurement point is smoother and smaller, and the noise in the generating position and propagation path can be reduced by 1.9 dB–5.5 dB.

scholarly journals Numerical Simulation of Hole Distribution Blasting with Different Distribution Forms

2020 ◽  
pp. 119
Author(s):  
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Large Diameter ◽  
Vibration Reduction ◽  
Blasting Vibration ◽  
Rectangular Hole ◽  
Finite Element Software ◽  
Damping Effect

According to the vibration of cut blasting, the number of holes and the location of holes are reasonably designed by using finite element software LS-DYNA. The rectangular holes and hollow holes in straight cut are simulated respectively. Of the hole in the straight-cut undercut blasting vibration law. The analysis shows that the larger the diameter of the hole is, the better the vibration reduction is. The more the number of holes is, the more obvious the damping effect is. The best blasting effect of the large diameter hollow hole and the large diameter rectangular hole is 0.93cm/s Reduce the blasting vibration speed, buffered the blasting time; get both a good blasting effect and effective rapid damping effect.

scholarly journals Simulation Study on the Blocking Effect and Vibration Reduction Characteristics of Acoustic Black Hole in Thin Plate

2020 ◽  
Vol 6 (4) ◽  
pp. 223-231
Author(s):  
Z. Liu ◽  
Y. Zhou ◽  
A. Golyanin
Keyword(s):  
Finite Element ◽  
Black Hole ◽  
Noise Reduction ◽  
Thin Plate ◽  
Vibration Reduction ◽  
Structural Vibration ◽  
Energy Concentration ◽  
Element Analysis ◽  
Finite Element Software ◽  
Reduction Effect

Recently, more and more scholars have devoted themselves to researching new methods of vibration reduction and noise reduction by manipulating the elastic waves in the structure to achieve the purpose of vibration reduction and noise reduction. To this end, a new type of ‘acoustic black hole’ structure is proposed, which reduces structural vibration while avoiding problems such as mass increase. In this paper, the vibration damping performance of the structure is mainly calculated by finite element software, and the energy concentration effect of the thin plate containing the acoustic black hole is verified by finite element analysis. A thin plate structure with four acoustic black holes is proposed. The calculation shows that the structure has obvious vibration reduction effect, and the vibration reduction effect can reach more than 20dB at high frequency.

Fatigue Reliability Analysis of Connecting Rod Made of Powder and Steel Forging Material

2013 ◽  
Vol 815 ◽  
pp. 268-272
Author(s):  
Jian Ye ◽  
Wei Gao ◽  
Chun Wu Liu ◽  
Zhao Qiang Zeng
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Technological Properties ◽  
Fatigue Reliability ◽  
Dimensional Model ◽  
Connecting Rod ◽  
Three Dimensional Model ◽  
Software Safety ◽  
Finite Element Software ◽  
Steel Forging

A three dimensional model of connecting rod has been made and drawn meshes. The load and boundary conditions were determined and the stress was calculated with finite element software. Safety of connecting rod was discussed using the safe coefficient. The rod made of powder forging is better in mechanical and technological properties.

Finite-Element Model-Based Fault Prognosis on Key Components of the Reciprocating Compressor

2010 ◽  
Author(s):  
Wenqing Lu ◽  
Laibin Zhang ◽  
Wei Liang ◽  
Shuguo Li
Keyword(s):  
Finite Element ◽  
3D Model ◽  
Intrinsic Property ◽  
Element Model ◽  
Normal Operation ◽  
Fe Model ◽  
Reciprocating Compressor ◽  
Connecting Rod ◽  
Element Analysis ◽  
Fault Prognosis

The reciprocating compressor has become one of the most important equipments in petroleum and chemical industry. Study on vibration of the reciprocating compressor has a great significance to monitor the safety and reliability of the compressor. But it’s very difficult to predict the compressor and achieve the desired goal due to the complicated structure and operational aspect of the compressor. Experimental solution is expensive and time consuming. Therefore, finite element analysis (FEA) method is proposed to predict and locate the breakage of several key components on reciprocating compressor in compressor station. Non-destructive fault diagnosis and troubleshooting of the compressor can be achieved by application of FEA. The reasonable and simplified 3D model of the reciprocating compressor, which is validated with the actual prototype, is built by a CAD drawing software-SolidWorks. Then the ANSYS FE model is created by importing the 3D model into a FEA software-ANSYS. The ANSYS FE model can be used for stress analysis as well as intrinsic property analysis of the structural components. In this paper there are several ANSYS FE models of key components presented, including crankshaft, connecting-rod, crosshead and air valve. Then FEA method is applied to the fault localization of those components. According to the simulation results, the sites vulnerable to failure can be fixed on key components. The conclusions are consistent with the problems during the normal operation. Therefore, FEA is an effective and prospective method on fault prognosis of the reciprocating compressor.

Torsional Vibration Analysis for Large-Scale Reciprocating Compressor Crankshaft

2013 ◽  
Vol 457-458 ◽  
pp. 428-432
Author(s):  
Ke Zhan ◽  
Xiao Ling Yu ◽  
Bin Yan Yu ◽  
Jia Xie
Keyword(s):  
Finite Element ◽  
Large Scale ◽  
New Method ◽  
Reciprocating Compressor ◽  
Connecting Rod ◽  
Transient Stress ◽  
Finite Element Technology ◽  
Body Dynamics ◽  
Vibration Stress ◽  
Multi Body

This paper presents a new method which combined multi-body dynamics theory and finite element technology to calculate transient stress of the crankshaft of the large-scale reciprocating compressor. On the basis of multi-body dynamics theory, the kinematical simulation of the crankshaft, the connecting rod, the piston and other components were performed, and thus to get the vibration modal of the crankshaft. So we can judge whether the crankshafts torsional resonance will happen, as well as get the real loads on the crankshaft when it worked. Then the transient stress of the crankshaft can be calculated using finite element technology. Comparing to traditional stress calculating methods, this new method not only considers the variable inertia which caused by reciprocating masss movement, but also can calculate the integrated vibration stress of crankshaft in three directions, including torsion, lateral and axial. Therefore, this method can describe dynamic characteristics of the crankshaft more accurately and more entirely.

Dynamic simulation and stress analysis for reciprocating compressor crankshaft

2012 ◽  
Vol 227 (4) ◽  
pp. 845-851 ◽  
Author(s):  
Bin-yan Yu ◽  
Quan-ke Feng ◽  
Xiao-ling Yu
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
High Speed ◽  
Dynamics Simulation ◽  
Von Mises Stress ◽  
Design Stage ◽  
Flexible Body ◽  
Reciprocating Compressor ◽  
Connecting Rod ◽  
Element Analysis

With the continuous trend toward high speed and large size, the reciprocating compressor crankshaft faces more serious potential threat of crack due to vibration. Therefore, early stress analysis of the crankshaft must be done thoroughly in the design stage. This article introduces a method, which combines flexible body dynamic and finite element analysis to calculate stress of the crankshaft. In this method, the load variation with time is obtained by flexible body dynamics simulation of crank and connecting rod mechanism. After that loads are loaded on finite element model of the crankshaft, and then the stress of the crankshaft is calculated in time domain. This stress can be utilized to do fatigue analysis and predict the life of crankshaft. Using this method, stress of a practical crankshaft, belonging to 6M51 reciprocating compressor, is calculated. The result showed that the maximum von Mises stress is 158 MPa, and the estimated life, which was calculated by Palmgren–Miner linear damage accumulation theory, is 2.0230e + 007 hours.

Modal Testing and Analysis of Z-Axis Supporting Plate for High–Speed PCB NC Drilling Machine

2014 ◽  
Vol 496-500 ◽  
pp. 1016-1019
Author(s):  
Ling He ◽  
Guo Huang ◽  
Heng Yu Wu ◽  
Ya Li Lei
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Modal Testing ◽  
Bottom Plate ◽  
Signal Acquisition ◽  
Drilling Machine ◽  
Element Analysis ◽  
Finite Element Software ◽  
Before And After ◽  
Supporting Plate

A constraint condition finite element analysis mode of the high speed PCB drilling machine Z-axis bottom plate was established on the platform of Abaqus. And then an optimal structural mode of a Z-axis supporting plate was obtained by means of performing constraint modal analysis and dynamic analysis optimization on the structure of the Z-axis supporting plate. modal tests and analyses were performed on the Z-axis plate before and after the optimization with the application of an LMS vibration/dynamic signal acquisition and analysis system. The experimental results were shown that the tested Z-axis plate dynamic characteristics were basically consistent with the obtained Z-axis supporting plate mode from simulation analyses using the finite element software Abaqus. It was proved that using the finite element software was feasible for optimizing the Z-axis supporting plate structure.

scholarly journals A New Beam Finite Element for Static Bending Analysis of Slender Transversely Cracked Beams on Two-Parametric Soils

2021 ◽  
Vol 11 (22) ◽  
pp. 10939
Author(s):  
Matjaž Skrinar ◽  
Mojmir Uranjek ◽  
Iztok Peruš ◽  
Denis Imamović
Keyword(s):  
Finite Element ◽  
Analytical Solution ◽  
Polynomial Interpolation ◽  
Transverse Displacement ◽  
Bending Analysis ◽  
Finite Element Software ◽  
Matrix Coefficients ◽  
Governing Differential Equation ◽  
Load Vector ◽  
Cubic Polynomial

This paper derives an original finite element for the static bending analysis of a transversely cracked uniform beam resting on a two-parametric elastic foundation. In the simplified computational model based on the Euler–Bernoulli theory of small displacements, the crack is represented by a linear rotational spring connecting two elastic members. The derivations of approximate transverse displacement functions, stiffness matrix coefficients, and the load vector for a linearly distributed load along the entire beam element are based on novel cubic polynomial interpolation functions, including the second soil parameter. Moreover, all derived expressions are obtained in closed forms, which allow easy implementation in existing finite element software. Two numerical examples are presented in order to substantiate the discussed approach. They cover both possible analytical solution forms that may occur (depending on the problem parameters) from the same governing differential equation of the considered problem. Therefore, several response parameters are studied for each example (with additional emphasis on their convergence) and compared with the corresponding analytical solution, thus proving the quality of the obtained finite element.

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