— end bearing splices in columns
Investigation of the end bearing performance of displacement piles in sand
Ngày tải lên :
13/08/2015, 10:41
... CPT-Based Methods for End Bearing of Piles in Siliceous Sands ratio (FFR) (i.e IFR measured over the final stages of pile installation) is included in a formulation for end bearing Despite the strong ... formulation for endbearing of open-ended piles is seen as a significant limitation that may result in large differences in end- bearing capacity (40 percent) for small changes in pile diameter ... study into the end bearing performance of displacement piles in sand The research involved careful examination of the existing databases of static load tests in sand, field and centrifuge testing...
- 403
- 403
- 0
Tài liệu Bearing Design in Machinery P2 pptx
Ngày tải lên :
19/01/2014, 23:20
... force, F, acting on the gear is equal to the radial component of the force acting on the bearing Since the gear is equally spaced between the two bearings supporting the shaft, each bearing will ... two bearings It is a radial bearing load because it is acting in the direction normal to the shaft centerline Since the helical gear is mounted on the shaft at equal distances from both bearings, ... is dp ¼ 30 in Find the radial force on each of the two bearings supporting the shaft The ratio of the two bearings’ length and diameter is L=D ¼ 0:5 The bearings are made of acetal resin material...
- 10
- 328
- 0
Tài liệu Bearing Design in Machinery P1 doc
Ngày tải lên :
19/01/2014, 23:20
... Calculations Bearing Operating Temperature Rolling Bearing Lubrication Bearing Precision Internal Clearance of Rolling Bearings Vibrations and Noise in Rolling Bearings Shaft and Housing Fits Stress ... result in premature rollingelement failure ROLLING-ELEMENT BEARINGS Rolling-element bearings, such as ball, cylindrical, or conical rolling bearings, are the bearings most widely used in machinery ... rolling-element bearing and hydrodynamic, hydrostatic, and magnetic bearings Rolling-element bearings are characterized by rolling motion, such as in ball bearings or cylindrical rolling-element bearings...
- 40
- 389
- 0
Promoting the Use of End-to-End Congestion Control in the Internet pptx
Ngày tải lên :
15/03/2014, 22:20
... incentives at routers, in maintaining an environment characterized by end- to -end congestion control; or to maintain a virtual-circuit-style environment where packets are prevented from entering ... provide a concrete incentive for the use of end- to -end congestion control, but would also include the danger of incorrectly throttling flows that are in fact using conformant end- to -end congestion ... a whole to include incentives for applications to use end- to -end congestion control In the current architecture, there are no concrete incentives for individual users to use end- to -end congestion...
- 16
- 402
- 0
Báo cáo khoa học: Cloning and functional characterization of Phaeodactylum tricornutum front-end desaturases involved in eicosapentaenoic acid biosynthesis doc
Ngày tải lên :
31/03/2014, 09:20
... according to the manufacturer’s instructions and submitted to random sequencing by the chain termination method using the ABI PRISM Big Dye Termination Cycle Sequencing Ready Reaction Kit (Perkin-Elmer, ... After selection on minimal medium agar plates without uracil or leucine, cells harbouring the yeast plasmid were cultivated in minimal medium lacking uracil or leucine but containing 2% (w/v) raffinose ... pY2PSE1 [20] using BamHI, cloned behind the galactose-inducible promoter PGAL1 of pESC-LEU before inserting the ORF of PtD5 as indicated above C13ABYS86 Saccharomyces cerevisiae strain (leu2, ura3,...
- 9
- 455
- 0
Báo cáo hóa học: "Research Article PAPR and the Density of Information Bearing Signals in OFDM" docx
Ngày tải lên :
21/06/2014, 05:20
... operator EIN : l2 (IN ) → L∞ ({−N , , N }) such that for all a ∈ l2 (IN ) satisfying a l2N+1 ≤ 1, EIN a EIN a k∈RN ak eikt + k IN Definition The PAPR reduction problem is solvable for IN with ... signals The Khinchine inequality (I.B.8 in [15]) is the analogous statement to Paley’s Theorem for the Walsh basis Here, again, one could gain solvability by taking the elements n with indices {2k ... Advances in Signal Processing reservation as the number of tones increases This paper provides insight to this scheme as the number of tones involved becomes large This paper provides an initial investigation...
- 9
- 438
- 0
Bearing Design in Machinery P1 potx
Ngày tải lên :
03/07/2014, 12:20
... Calculations Bearing Operating Temperature Rolling Bearing Lubrication Bearing Precision Internal Clearance of Rolling Bearings Vibrations and Noise in Rolling Bearings Shaft and Housing Fits Stress ... plane-slider bearing is used mostly for linear motion, such as the slides in machine tools A bearing can also be classified as a radial bearing or a thrust bearing, depending on whether the bearing load ... rolling-element bearing and hydrodynamic, hydrostatic, and magnetic bearings Rolling-element bearings are characterized by rolling motion, such as in ball bearings or cylindrical rolling-element bearings...
- 30
- 279
- 0
Bearing Design in Machinery P2 ppt
Ngày tải lên :
03/07/2014, 12:20
... the spindle from external vibrations, such as from the driving motor In comparison to rolling-element bearings, experiments in hydrostatic-bearings indicated the following machining errors in the ... cause for rolling bearing failure is overheating The heat generated by friction losses is dissipated in the bearing, resulting in uneven temperature distribution in the bearing During operation, ... purposes In addition to friction-energy losses, bearing overheating can be caused by heat sources outside the bearing, such as in the case of engines or steam turbines In aircraft engines, only rolling...
- 20
- 384
- 0
Bearing Design in Machinery Episode 3 Part 12 doc
Ngày tải lên :
21/07/2014, 17:20
... Finish,’’ Cincinnati Milling Machine Co Report, Aug 24, 1940 FAG (1986): ‘‘Rolling Bearing and their Contribution to the Progress of Technology’’, p 191 FAG (1998): ‘‘The Design of Rolling Bearing ... ‘‘Elastohydrodynamic Lubrication in Human Joints.’’ Engineering in Medicine, Vol (No 1), pp 35–41 Hodgekinson, F (1923): ‘‘Improvements relating to lubrication of bearings,’’ British Pat 18595 Horowitz, ... (1973): ‘‘High Speed Hybrid Bearing, A Fluid Bearing and Rolling Bearing Connected in Series’’, U S Patent No 3,759,588 Armstrong-Helouvry, B (1991): ‘‘Control of Machines with Friction’’, Kluwer...
- 17
- 363
- 0
Bearing Design in Machinery Episode 3 Part 11 docx
Ngày tải lên :
21/07/2014, 17:20
... Jersey Institute of Technology, Bearing and Bearing Lubrication Laboratory The testing apparatus is similar to that shown in Fig 14-7, and the test bearing is UHMWPE journal bearing against stainless ... Ceramics Aluminum oxide ceramic femoral heads in combination with UHMWPE cups have increasing use in prosthetic implants Fine grain, high density aluminum Copyright 2003 by Marcel Dekker, Inc All ... the design engineers to have an insight into the dynamic friction characteristics of UHMWPE used in implant joints During walking, the hip joint is subjected to oscillating sliding velocity Dynamic...
- 16
- 273
- 0
Bearing Design in Machinery Episode 3 Part 10 ppt
Ngày tải lên :
21/07/2014, 17:20
... temperature Tmax can result in bearing failure, particularly in large bearings with white metal lining Therefore, in these cases, it is necessary to limit Tmax during the design stage With a ... lubrication in the rolling bearing requires a certain minimum speed below which F IG 18-12 Thermohydrodynamic solution showing the isotherm contours plot in a stationary sleeve of a journal bearing L=D ... found less friction and wear in the connecting-rod bearing in a car engine (dynamically loaded journal bearing) Analytical investigations showed that the improvements in the lubrication performance...
- 17
- 324
- 0
Bearing Design in Machinery Episode 3 Part 9 potx
Ngày tải lên :
21/07/2014, 17:20
... failure in the case of oil supply interruption 18.1.3 Limitations of Rolling Bearings Rolling bearings are less sensitive than hydrodynamic bearings to starting and stopping However, rolling bearing ... extending rolling bearing life The composite bearing has a longer life than either a rolling bearing or fluid film bearing on its own In addition, if the oil supply is interrupted, the composite bearing ... a properly designed composite bearing During start-up, the composite bearing operates as a rolling bearing and the starting friction is as low as in a rolling bearing The friction coefficient at...
- 16
- 302
- 0
Bearing Design in Machinery Episode 3 Part 8 pot
Ngày tải lên :
21/07/2014, 17:20
... sliding bearings show a nearly constant friction at very low sliding speed (boundary lubrication region) However, for metal bearing materials, our recent experiments in the Bearing and Bearing ... been an increasing interest in dynamic friction measurements Dynamic tests, such as oscillating sliding motion, require on-line recording of friction Experiments with an oscillating sliding plane ... and sleeve in engines where the sliding speed and load periodically vary with time In the last decade, there was an increasing interest in dynamic friction as well as its modeling This interest...
- 18
- 293
- 0
Bearing Design in Machinery Episode 3 Part 7 docx
Ngày tải lên :
21/07/2014, 17:20
... two frictiontesting machines can be applied for a journal bearing or a rolling-element bearing; the third machine is for friction in linear sliding motion 14.6 FRICTION-TESTING MACHINE WITH A HYDROSTATIC ... apparatus in order to supply oil by gravity into the four bearings through four segments of flexible tubing The oil is drained from the bearings through a hole in the external housing into a collecting ... self-aligning ball bearings The selfaligning bearings are held from rotating by thin metal strips At the same time, elastic bending of the strips allows a small angular rotation for self-aligning In...
- 15
- 321
- 0
Bearing Design in Machinery Episode 3 Part 6 docx
Ngày tải lên :
21/07/2014, 17:20
... the locating and floating bearings b Find the adjusted fatigue life L10 of a deep-groove ball bearing for the locating and floating bearings c Find the static radial equivalent load d Find the radial ... sliding the inner ring on the shaft Find the minimum inertial torque (N–m), which can result in undesired rotation sliding of the shaft inside the inner ring during the start-up ð f ¼ 0:5Þ The bearing ... the locating and floating bearing 13-3 Find the operating clearance (or interference) for a standard deepgroove ball bearing No 6312 that is fitted on a shaft and inside housing as shown in Fig 13-6...
- 18
- 339
- 0
Bearing Design in Machinery Episode 3 Part 5 docx
Ngày tải lên :
21/07/2014, 17:20
... double-sealed bearings (from SKF, 1992, with grease packing and penetrates into the bearing This design of a double-sealed bearing combined with noncontact labyrinth seals protects the bearing from ... following cases require shorter periods between lubrications: Full-complement cylindrical rolling bearing, 0:2 Dt (in scale c) Cylindrical rolling bearing with a cage, 0:3 Dt (in scale c) Cylindrical ... Oil Circulating Systems There are several benefits in using oil circulation systems for rolling bearings, where a monitoring pump supplies a low flow rate of oil to each bearing In certain applications,...
- 13
- 303
- 0
Bearing Design in Machinery Episode 3 Part 4 pps
Ngày tải lên :
21/07/2014, 17:20
... is a locating=floating bearing arrangement The two bearings at the top form the locating side, whereas the lower cylindrical roller bearing is a floating bearing In the locating top bearings, preload ... the bearing might be overfilled, resulting in overheating during operation Therefore, in large bearings, the grease is replaced manually during overhauls In addition, large bearings require topping-up ... for feeding grease into the housing of rolling bearings is undesirable, particularly for large bearings, because it packs too much grease into the housing and causes bearing overheating Moreover,...
- 15
- 377
- 0
Bearing Design in Machinery Episode 3 Part 3 pps
Ngày tải lên :
21/07/2014, 17:20
... the rotating ring of a rolling-element bearing is always tightly fitted in its seat In most machines, the rotating ring is the inner ring, such as in a centrifugal pump, where the bearing bore ... outer ring SOLID HOUSINGS Rotating outer ring load Heavy loads on bearings in thin-walled housings, heavy shock loads Normal loads and heavy loads Roller bearing wheel hubs, big -end bearings P7 ... referred to as a locating=floating or fixed -end= free -end bearing arrangement In this design, one bearing is the locating bearing, which is fixed in the axial direction to the housing and shaft and can...
- 17
- 248
- 0
Bearing Design in Machinery Episode 3 Part 2 ppt
Ngày tải lên :
21/07/2014, 17:20
... rotational speed of the bearing The bearing size is determined by taking the average of the inner (bearing bore) and outer diameters of the bearing The pitch diameter of the bearing is dþD 25 þ 37 ... (inner ring bore) The axial inner ring run-out is measured by an indicator in contact with the face of the inner ring, in a direction normal to the face of the inner ring (parallel to the bearing ... Inc All Rights Reserved 13.6 INTERNAL CLEARANCE OF ROLLING BEARINGS Rolling bearings are manufactured with internal clearance The internal clearance is between the rolling elements and the inner...
- 16
- 239
- 0
Bearing Design in Machinery Episode 3 Part 1 pps
Ngày tải lên :
21/07/2014, 17:20
... permission) Bearing type Deep groove ball bearings* Angular contact ball bearings a ¼ 15 a ¼ 20 a ¼ 25 a ¼ 30 a ¼ 35 a ¼ 40 a ¼ 45 Self-aligning ball bearings Single row bearings X0 Y0 ... or water cooling is used in the bearing housing for reducing the bearing temperature Also, fast oil circulation can help to remove the heat from the bearing 13.3.1 Estimation of Bearing Temperature ... based on bearing speed and bearing average diameter are used Figure 13-1 is used for determining the minimum oil viscosity for lubrication of rolling-element bearings as a function of bearing size...
- 19
- 303
- 0