A New Method to Study the Joint Surfaces With Large Areas and its Application in Machine Tools

In the finite element analysis (FEA) of machine tools, the study on contact parameters uses the data calculated by theory or identified by experiment directly, which may cause the great distinguish between the results obtained by FEA and by experiment. It is well known that the basic assumption on contact is the contact load of the joint surface stays the same throughout all areas. For the joint surfaces with small areas the loads are well-distributed and unchanged. But for the big joint surfaces the error will be very large with that assumption. A different method was proposed in this paper to calculate the parameters of joint surfaces with big areas. According to the different load conditions, we divided the joint surfaces into different parts and for each part the contact parameters were calculated respectively by the theory we established before. Substituting the parameters into the finite element model the result of FEA can be got. Moreover the methods on how to divide the joint surfaces into parts and how to apply the parameters to FEA of machine tools were also discussed. A dynamic experimental study on contact parameters was carried out. The first 3 natural frequencies and mode shapes of the experiment had a good agreement with the ones of FEA while the error was acceptable. As a result, for the joint surfaces with big areas such as those in machine tools, using the method proposed in this paper, the result of FEA will be more reasonable and the finite element model will be much closer to real one.

Analysis on Dynamic Characteristics of the Linear Rolling Guide Pair and Experiment

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.52-54.989 ◽

2011 ◽

Vol 52-54 ◽

pp. 989-994

Author(s):

Xiao Peng Li ◽

Wei Nie ◽

Bang Chun Wen

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Dynamic Characteristics ◽

Machine Tools ◽

Great Influence ◽

Element Model ◽

Joint Surface ◽

Study Results ◽

Rolling Guide ◽

Linear rolling guide is one of the most essential parts of the NC modern machine tools, and they play a significant supporting and guiding role in machine tools components. Especially, the joint surface between guides has great influence on machine's dynamic characteristics. According to this, in this work, taken the Japanese THK Corporation's SNS35LR rolling guide as specific study object, the finite element model of guide pair has been established with the joint surface influence considered. And by the method of the theoretical analysis with the experimental confirmation combined; the dynamic characteristics of the linear rolling guide pair's were studied relatively. Thus, the theoretical model and the finite element model established in this paper can be confirmed by the experiment. It has been found that the theoretical models established are consistent with the results of experiment. This study results can provide useful guidance for the dynamic analysis and the structure optimization of CNC machine tools, and numerical simulation in engineering and design in the development of such machines with rolling guide used.

Finite Element Analysis of Structural Strength of Concrete Mixing Truck’s Frame

10.4028/www.scientific.net/amr.945-949.1143 ◽

2014 ◽

Vol 945-949 ◽

pp. 1143-1149

Author(s):

Hai Xia Sun ◽

Hua Kai Wei ◽

Xiao Fang Zhao ◽

Jia Rui Qi

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Finite Element Model ◽

Structural Strength ◽

Element Model ◽

Basic Element ◽

Operating Conditions ◽

Frame Structure ◽

Element Analysis ◽

The finite element model of the concrete mixing truck’s frame is builded by using shell as basic element, and the process of building the finite element model of the balance suspension is introduced in detail. Based on this, frame’s stress on five types of typical operating conditions are calculated by using the finite element analysis software, NASTRAN, and results can show the dangerous position and the maximum stress position on the frame. The analysis result on structural strength can provide the basis for further improving the frame structure.

Dynamic Characteristics and Finite Element Model Updating of Micromachined Torsion Structures

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.284-287.1831 ◽

2013 ◽

Vol 284-287 ◽

pp. 1831-1835

Author(s):

Wei Hsin Gau ◽

Kun Nan Chen ◽

Yunn Lin Hwang

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Finite Element Model ◽

Model Updating ◽

Speckle Pattern ◽

Element Model ◽

Mode Shapes ◽

Electronic Speckle Pattern Interferometry ◽

Finite Element Model Updating ◽

Element Analysis

In this paper, two experimental techniques, Electronic Speckle Pattern Interferometry and Stroboscopic Interferometry, and two different finite element analysis packages are used to measure or to analyze the frequencies and mode shapes of a micromachined, cross-shaped torsion structure. Four sets of modal data are compared and shown having a significant discrepancy in their frequency values, although their mode shapes are quite consistent. Inconsistency in the frequency results due to erroneous inputs of geometrical and material parameters to the finite element analysis can be salvaged by applying the finite element model updating procedure. Two updating cases show that the optimization sequences converge quickly and significant improvements in frequency prediction are achieved. With the inclusion of the thickness parameter, the second case yields a maximum of under 0.4% in frequency difference, and all parameters attain more reliable updated values.

Verification of Mainframe Computer Structure Finite Element Model Under Vibration and Seismic Tests

Volume 8: Seismic Engineering ◽

10.1115/pvp2018-84200 ◽

2018 ◽

Author(s):

Budy Notohardjono ◽

Shawn Canfield ◽

Suraush Khambati ◽

Richard Ecker

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Element Model ◽

Frame Structure ◽

Element Analysis ◽

Physical Test ◽

Design Cycle ◽

Nonlinear Contact ◽

The Finite Element Model ◽

Sine Sweep

Shorter development design schedules and increasingly dense product designs create difficult challenges in predicting structural performance of a mainframe computer’s structure. To meet certain certification benchmarks such as the Telcordia Technologies Generic Requirements GR-63-CORE seismic zone 4 test profile, a physical test is conducted. This test will occur at an external location at the end of design cycle on a fully functional and loaded mainframe system. The ability to accurately predict the structural performance of a mainframe computer early in the design cycle is critical in shortening its development time. This paper discusses an improved method to verify the finite element analysis results predicting the performance of the mainframe computer’s structure long before the physical test is conducted. Sine sweep and random vibration tests were conducted on the frame structure but due to a limitation of the in-house test capability, only a lightly loaded structure can be tested. Evaluating a structure’s modal stiffness is key to achieving good correlation between a finite element (FE) model and the physical system. This is typically achieved by running an implicit modal analysis in a finite element solver and comparing it to the peak frequencies obtained during physical testing using a sine sweep input. However, a linear, implicit analysis has its limitations. Namely, the inability to assess the internal, nonlinear contact between parts. Thus, a linear implicit analysis may be a good approximation for a single body but not accurate when examining an assembly of bodies where the interaction (nonlinear contact) between the bodies is of significance. In the case of a nonlinear assembly of bodies, one cannot effectively correlate between the test and a linear, implicit finite element model. This paper explores a nonlinear, explicit analysis method of evaluating a structure’s modal stiffness by subjecting the finite element model to a vibration waveform and thereafter post processing its resultant acceleration using Fast Fourier Transformation (FFT) to derive the peak frequencies. This result, which takes into account the nonlinear internal contact between the various parts of the assembly, is in line with the way physical test values are obtained. This is an improved method of verification for comparing sine sweep test data and finite element analysis results. The final verification of the finite element model will be a successful physical seismic test. The tests involve extensive sequential, uniaxial earthquake testing in both raised floor and non-raised floor environments in all three directions. Time domain acceleration at the top of the frame structure will be recorded and compared to the finite element model. Matching the frequency content of these accelerations will be proof of the accuracy of the finite element model. Comparative analysis of the physical test and the modeling results will be used to refine the mainframe’s structural elements for improved dynamic response in the final physical certification test.

Hydroelastic Modal Analysis of the Perforated Cylindrical Shell in SMART

ASME 2011 Small Modular Reactors Symposium ◽

10.1115/smr2011-6575 ◽

2011 ◽

Author(s):

Youngin Choi ◽

Seungho Lim ◽

Kyoung-Su Park ◽

No-Cheol Park ◽

Young-Pil Park ◽

...

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Dynamic Characteristics ◽

Natural Frequencies ◽

Element Model ◽

Mode Shapes ◽

Steam Generators ◽

Structure Interaction ◽

The Finite Element Model ◽

Reactor Internals

The System-integrated Modular Advanced ReacTor (SMART) developed by KAERI includes components like a core, steam generators, coolant pumps, and a pressurizer inside the reactor vessel. Though the integrated structure improves the safety of the reactor, it can be excited by an earthquake and pump pulsations. It is important to identify dynamic characteristics of the reactor internals considering fluid-structure interaction caused by inner coolant for preventing damage from the excitations. Thus, the finite element model is constructed to identify dynamic characteristics and natural frequencies and mode shapes are extracted from this finite element model.

Theoretical and Finite Element Analysis of Crosshead of Quintuple Cylinders Fracturing Pump

10.4028/www.scientific.net/amr.201-203.253 ◽

2011 ◽

Vol 201-203 ◽

pp. 253-256 ◽

Cited By ~ 1

Author(s):

Zhi Peng Lv ◽

Si Zhu Zhou ◽

Xiu Hua Ma

Keyword(s):

Boundary Condition ◽

Finite Element Analysis ◽

Finite Element ◽

Finite Element Model ◽

Element Model ◽

Maximum Force ◽

Element Analysis ◽

Plunger Pump ◽

Load Handling ◽

According to the plunger pump movement principle, this paper analyzed the two kind of typical force situation of the crosshead, and obtained the theoretical maximum force. Established the finite element model of the crosshead, gave an analysis to the load handling and boundary condition. The last results of the node stress and displacement show that the crosshead can work safely.

Finite Element Analysis of Engraving Machine as a Whole

10.4028/www.scientific.net/amr.411.54 ◽

2011 ◽

Vol 411 ◽

pp. 54-58

Author(s):

Tao Feng ◽

Xiao Li Jin

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Structural Design ◽

Optimization Design ◽

Element Model ◽

Modeling Method ◽

Joint Surface ◽

Dynamic Characterization ◽

Element Analysis ◽

Based on the analytical theories of the joint surface, finite element modeling method of two kinds of joint about rails and bolts were studied. The finite element model of the engraving machine is built and its static and dynamic characterization is analyzed by the universal ANSYS. By this way, unreasonable structural design of engraving machine can be conducted, which will provide support for the optimization design of the structure. The correctness of the modeling method of joint surface is confirmed.

Finite-Element Analysis of 10kN Deadweight Force Standard Machine Reverse Frame

10.4028/www.scientific.net/amr.694-697.194 ◽

2013 ◽

Vol 694-697 ◽

pp. 194-197

Author(s):

Li Juan Yu ◽

Chang Ju Xu ◽

Xue Cheng Zhang

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Finite Element Model ◽

Critical Condition ◽

Element Model ◽

Element Analysis ◽

Model Stability ◽

Pulling Force ◽

In the test enginery, using reverse frame put the pulling force into the pressure is the most commonly structure method. This paper analyzed the buckling problem of the process of reverse frame working, established the finite element model , stability analyzed , putted forward and proved the critical condition of reverse frame in the course of stability, Verified in 10kN deadweight force standard machine.

Modal Analysis of the Cabinet of a Drum Washing Machine

10.4028/www.scientific.net/amr.199-200.1126 ◽

2011 ◽

Vol 199-200 ◽

pp. 1126-1129

Author(s):

Su Fang Fu ◽

Han Gao ◽

Jia Xi Du ◽

Qiu Ju Zhang ◽

Xue Ming Zhang ◽

...

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Natural Frequencies ◽

Element Model ◽

Mode Shapes ◽

Ansys Software ◽

Washing Machine ◽

Element Analysis ◽

The Finite Element Model ◽

Good Agreement

In this paper, the finite element model for the cabinet of a drum washing machine and the model for testing vibration of the cabinet were developed in ANSYS software and PULSE™, respectively. A series of tests were conducted. The natural frequencies and mode shapes were obtained by finite element analysis and modal experiment, which revealed weak parts of the cabinet. Meanwhile, the computational modes were in good agreement with experimental ones and this could provide an available method by which it was convenient to improve the design of the cabinet.

Volume 1: Offshore Technology; Special Symposium on Ocean Measurements and Their Influence on Design ◽

A Finite Element Analysis for Unbonded Flexible Risers Under Torsion

10.1115/omae2007-29140 ◽

2007 ◽

Author(s):

A. Bahtui ◽

H. Bahai ◽

G. Alfano

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Numerical Model ◽

Finite Element Model ◽

Time Integration ◽

Element Model ◽

Integration Scheme ◽

Element Analysis ◽

Benchmark Solutions ◽

This paper presents a detailed finite element analysis of a five-layer unbonded flexible riser. The numerical results are compared analytical solutions for various load cases. In the finite element model all layers are modelled separately with contact interfaces placed between each layer. The finite element model includes the main features of the riser geometry with very little simplifying assumptions made. The numerical model was solved using a fully explicit time-integration scheme implemented in a parallel environment on a 16-processor cluster. The very good agreement found from numerical and analytical comparisons validates the use of our numerical model to provide benchmark solutions against which further detailed investigation will be made.