failure analysis of mechanical seals

... Trang 1Journal of Science and Technology in Civil Engineering NUCE 2019 13 (3): 1–14OPERATIONAL MODAL ANALYSIS OF MECHANICAL SYSTEMS USING TRANSMISSIBILITY FUNCTIONS IN THE PRESENCE OF HARMONICS ... excitation is of colored noise The aim of this work is to assess the performance of the modal iden-tification technique based on transmissibility functions in presence of harmonics For the sake of completeness, ... responses of a cantilever beam were used The beam of Dural material, is of 850 mm in length and has a rectangular cross-section of 40 mm x 4.5 mm The Dural material has a Young modulus of 74 GPa

Ngày tải lên: 12/01/2020, 02:14

... Trang 1Journal of Science and Technology in Civil Engineering NUCE 2019 13 (3): 1–14OPERATIONAL MODAL ANALYSIS OF MECHANICAL SYSTEMS USING TRANSMISSIBILITY FUNCTIONS IN THE PRESENCE OF HARMONICS ... excitation is of colored noise The aim of this work is to assess the performance of the modal iden-tification technique based on transmissibility functions in presence of harmonics For the sake of completeness, ... responses of a cantilever beam were used The beam of Dural material, is of 850 mm in length and has a rectangular cross-section of 40 mm x 4.5 mm The Dural material has a Young modulus of 74 GPa

Ngày tải lên: 12/04/2021, 08:50

... Introduction∗ The static and dynamic behavior of FGM cylindrical shell attracts special attention of a lot of authours in the world In static analysis of FGM cylindrical shells, many studies have ... Trang 155 Buckling analysis of eccentrically stiffened functionally graded circular cylindrical thin shells under mechanical load Nguyen Thi Phuong1,*, Dao Huy Bich2 1 University of Transport Technology, ... relations of large deformation The postbuckling of shear deformable FGM cylindrical shells surrounded by an elastic medium was studied by Shen [8] Sofiyev [9] analyzed the buckling of FGM circular

Ngày tải lên: 04/09/2016, 11:59

... Trang 1Original ArticleAnalysis of microstructural effects on mechanical properties of copper alloys a Graduate School of Natural Science and Technology, Okayama University, ... exhibited high mechanical strength, which is caused by increases both in the degree of order and in the electron-to-atom (e/a) ratio[10] The effects of micro-structural characteristics on the mechanical ... result of fine-grained structure and low internal stress In contrast, high ductility (with a fracture strain of more than 30%) was found for both cast AlBC and cast HB; moreover, both of these

Ngày tải lên: 14/12/2017, 20:13

... segment of thickness h and length L formed by the rotation of a plane circular arc of radius R around an axis in the plane of the curve as shown in Fig.1 The geometry and coordinate system of a ... buckling load of the concave shell is lower than that of the convex shell Effect of a=h and L=a Ratios Tables6and7show the effect of the a=h and L=a ratios on the critical load of stiffened FGM ... “Buckling analysis of eccentrically stiffened functionally graded circular cylindrical thin shells under mechanical load ” J Math Phys., 29(2), 55–72. Shen, H S (2002) “Postbuckling analysis of axially-loaded

Ngày tải lên: 16/12/2017, 17:48

... edge of m sartorius as lateral margin (AGITG, BNG) would lead to a rea-sonable number of failures These could be avoided by the inclusion of 0.5–1 cm of the ventral space of the medial part of ... of being outside or inside of the CTV of RTOG Discussion PET imaging is a very sensitive method for detecting LN metastases in primary staging of AC [9] We evalu-ated the patterns of spread of ... British National Guidance (BNG) Furthermore, a detailed analysis of the location of LN of the inguinal region was performed Results: Twenty-two out of thirty-seven AC patients with pre-treatment PET

Ngày tải lên: 17/06/2020, 17:08

... case of normal distribution The probability of failure depends on the intersection area of the two PDFs, where the load on the system might exceed its strength In Fig.2(b), the probability of failure ... investigate the probability of failure of girder designs with two different coefficients, COVF = 0.05 and COVF = 0.1 In order to reduce the probability of failure of girder design, the geometric ... order to reach a probability of failure at a level of 10−4 For COVF of 0.1, it is seen that girders having a factor kgeo = 1.1 is only enough for a very high level of failure probability (Pf ∼ 0.1,

Ngày tải lên: 25/11/2020, 20:06

... Introduction∗ The static and dynamic behavior of FGM cylindrical shell attracts special attention of a lot of authours in the world In static analysis of FGM cylindrical shells, many studies have ... Trang 155 Buckling analysis of eccentrically stiffened functionally graded circular cylindrical thin shells under mechanical load Nguyen Thi Phuong1,*, Dao Huy Bich2 1 University of Transport Technology, ... relations of large deformation The postbuckling of shear deformable FGM cylindrical shells surrounded by an elastic medium was studied by Shen [8] Sofiyev [9] analyzed the buckling of FGM circular

Ngày tải lên: 18/01/2021, 05:42

... (a) mechanism of tensile failure of neat GFRP specimen; (b) nanofiber pull-out and delay in crack propagation caused due to crosslinking of MWCNTs (c) image of the failure mechanism of specimen ... certain loading, the mechanical properties of such laminates can only reach the best value with an optimum loading of MWCNTs In addition, the micromechanical failure modes and effect of MWCNTs loading ... Tiwaric a Department of Mechanical Engineering, Indian Institute of Technology (ISM), Dhanbad, India b College of Civil Engineering, Hunan University, Changsha, China c Department of Mechanical Engineering,

Ngày tải lên: 17/03/2021, 20:13

... 29 3.1.6 Effect analysis of radius of journal 31 3.1.7 Effect analysis of different of quantity of revolute clearance joints 32 3.1.8 Effect analysis of material 36 3.2 Static analysis for a ... analysis of thickness of flexure hinge 40 3.2.6 Effect analysis of incline angle between of two flexure hinges 41 3.2.7 Effect analysis of width of flexure hinge 42 3.3 Effect analysis of design ... with different material and CS of 0.3 mm (a) CF of R1; (b) CF of R2; (c) CF of R3; ((d) CF of R4; (e) CF of R5; (f) CF of R6;(g) CF of R7; (f) CF of T1;(h) CF of T2 37 Figure 3 38 BTCMFH (a)

Ngày tải lên: 27/05/2021, 22:41

... Quantitative Analysis of Factors in the Success or Failure of Electronic Societies Microsoft Research Microsoft Research Department of Sociology Microsoft Corporation Microsoft Corporation University of ... intuition is not proof, nor does intuition provide a precise mapping of the effects and dynamics of various forms of communication on cooperation Next, we will examine the usefulness of The Commons ... Hence, much of the communication infrastructure was already completed, and creating the specialized types of communication for The Commons was often a matter of just a few lines of code In addition,

Ngày tải lên: 18/10/2022, 07:07

... and protein quantita-tive analysis services were performed by professionals at the Protein Analysis and Research Center/Proteomics Core of Indiana University School of Medicine, co-located at ... constituents and functions of molecular repertoires involved in fati-gue loading has been a central focus of study in molecu-lar biology of the bone It still remains unknown what all the mechanically-sensitive ... expression of bone anabolic factors such as prostaglandins and Nitric oxide (See reference [13] for a review) In this work, we performed the first proteomic study of mechanical loading of bone tissues

Ngày tải lên: 01/11/2022, 08:32

... point of view, and the others often encounter convergence problems Moreover, only the mean value and the moments (often the variance only) are known, and since the density of probability of the ... problematic of solving linear systems of interval equations We will then introduce a new formulation of the problem, based on interval parameters which is adapted for the modeling of mechanical ... convergence of the iterative scheme The smaller the spectral radius of |[G]|, the faster the convergence of the algorithm and the smaller the overestimation of the solution 4.2 TEST OF THE NEW...

Ngày tải lên: 12/01/2014, 21:45

... HIGH FREQUENCY LIMIT OF THE PLATEAU OF THE UNDAMPED PVSS OF THE SIMPLE SHOCKS OF THE HIGH PV REGION IS SET BY THE MAXIMUM ACCELERATION OF THE SHOCK The Low Frequency Asymptote of a Zero Mean Shock ... normal mode analysis of a lumped mass MDOF system excited by a shock in matrix terms as Eq (20) z y [ m]{&&} + [ k ]{ z} = [ m]{1} && (20) They developed a modal solution of the motion of each mass ... mass as an element of the vector {z} The motion of each of the masses, zb, is the sum of the motion in each mode where Za is ath modal vector, and qa is time (history) response of the ath mode N...

Ngày tải lên: 09/03/2014, 00:20

... PROGRESSIVE FAILURE ANALYSIS OF TEXTILE COMPOSITES MAO JIA ZHEN (B.Eng (Hons)), NUS A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF MECHANICAL ENGINEERING NATIONAL UNIVERSITY OF ... fulfilment of the requirement for award of the degree of Doctorate of Philosophy The research has been carried out at the Department of Mechancial Engineering, National University of Singapore, ... Chapter Progressive Failure Analysis of NCF Composites 121 4.1 Introduction to NCF composites 121 4.2 Nonlinear Mechanical Modeling of NCF composites 123 4.2.1 Modeling of Elastoplasticity...

Ngày tải lên: 10/09/2015, 09:11

... Significance of the study In view of the above review of failure theories, it can be seen that numerous failure theories have been proposed in the literature for the failure analysis of composite ... PROGRESSIVE FAILURE ANALYSIS OF DOUBLE-NOTCHED COMPOSITE LAMINATES PHAM DINH CHI (B.ENG) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF MECHANICAL ENGINEERING ... Result of the cohesive parametric study .141 5.3 Parametric study of MPDM scheme 148 5.3.1 Description of the parametric study of MPDM scheme .148 5.3.2 Result of the parametric study of...

Ngày tải lên: 10/09/2015, 15:49

... Root Cause Failure Analysis Disclosed Failure of: MAIN BEARING • Heavily worn raceway, cracking of casehardened surface, plastic deformation of sealing groove • The main cause of failure was ... Failure statistics i.e MTBF Description of service failures, approach and methods for failure investigation Consequences of failure: Downtime/pollution and spillage/secondary damages Causes of ... main cause of failure was overloading of the bearing Actions/recommendation: • Reanalysis by FEM and redesign Root Cause Failure Analysis Disclosed Failure of: O-RING • Four gas leaks on TLP platform...

Ngày tải lên: 15/10/2013, 15:06

... of the target T for final printout ILLUSTRATION As an example of the performance of this section of the program, we offer the text word РАСПОЛОЖЕНИЕ Suppose this word occurs as the 7th word of ... insertion of a signal into the profile skeleton (PS) PART II Part II of the projected scheme, now in process of being programmed, has the purpose of analyzing the syntactical structure of each ... added to the profile skeleton, in which the nature of the non-word occurrences has previously been stored The profile skeleton will be subjected to a crude analysis in Section A of Part II ILLUSTRATION...

Ngày tải lên: 16/03/2014, 19:20

... respectively, of WTC and the positions of these slabs changed over time This suggests a progression of failure of certain parts of the flooring in this area of the tower At the moment of collapse of WTC ... some sort of coating has preserved the fireproofing in place 54 Figure 6–11 Missing fireproofing on flanges of exterior columns of north face of WTC Fireproofing has come off, revealing ... overview of the results of the mechanical and metallurgical analysis of structural steel from the World Trade Center (WTC), part of the National Institute of Standards and Technology Investigation of...

Ngày tải lên: 01/04/2014, 00:20

... completion of my dissertation process iv Table of Contents Acknowledgments iii List of Tables vii List of Figures viii CHAPTER INTRODUCTION Introduction to the Problem Background of the Study ... Statement of the Problem 18 Purpose of the Study 19 Rationale 19 Research Questions and Hypotheses 21 Significance of the Study 24 Definition of Terms 27 Assumptions and Limitations 28 Nature of the ... results of research which indicated that, 31.1% of projects would be cancelled before they ever got completed; 52.7% of projects would cost 189% of their original estimates; only 16.2% of projects...

Ngày tải lên: 01/06/2014, 14:04