An Investigation of Face Type Magnetic Couplers

1996 ◽  
Vol 210 (4) ◽  
pp. 263-272 ◽  
Author(s):  
R Waring ◽  
J Hall ◽  
K Pullen ◽  
M R Etemad
Keyword(s):  
Theoretical Analysis ◽  
Optimum Design ◽  
Experimental Test ◽  
Axial Load ◽  
Filling Factor ◽  
Theoretical Calculations ◽  
Test Results ◽  
Face Type ◽  
Design And Manufacture ◽  
Good Agreement

A theoretical analysis of magnetic couplers is recounted, leading to the design and manufacture of prototype disc type magnetic couplers. Design and development of experimental test rigs are also given. Test results are presented and compared with theoretical calculations. This shows very good agreement. The exception to the rule was the case of axial load measurements, which were not accurately evaluated by the computations. The geometries tested here showed the optimum design to consist of rotors with eight poles, magnet thickness of 10 mm and a filling factor of about 0.7.

Dynamic research and experimental analysis of a longitudinal–torsional coupled impactor

2021 ◽  
pp. 095440622110599
Author(s):  
Jialin Tian ◽  
Zhe Deng ◽  
Hongzhi He
Keyword(s):  
Theoretical Analysis ◽  
Experimental Test ◽  
Drilling Fluid ◽  
Rock Breaking ◽  
Torsional Stiffness ◽  
Drilling Process ◽  
Drill Bit ◽  
Test Results ◽  
Stick Slip ◽  
Innovative Design

The rock breaking efficiency of drill bit is deeply affected with the increase of drilling depth. The increase length of the drill string leads to torsional stiffness decrease, which may even result in the stick-slip phenomena. In order to improve the rock breaking efficiency and reduce the stick-slip, this paper proposed a longitudinal–torsional coupled impactor. The internal working mechanism was carried out by theoretical analysis and experimental test. Moreover, comparing the computation and test results, the following conclusions can be obtained and verified. This innovative design can provide appropriate longitudinal-torsional coupled impact to drill bit during drilling process, and the movement of the hammer and pendulum is periodic. With the increasing flow rate of drilling fluid, this tool can generate corresponding larger impact force, torque and higher impact frequency. The theoretical analysis results are consistent with the experimental test results, which verify the reliability of the innovative design and the accuracy of theoretical analysis. This paper can provide reference for the innovative design of downhole drilling tool, the development of drilling dynamics and the improvement of drilling efficiency especially in the conditions of complex and ultra-deep wells.

Nonlinear Flexural Vibrations of a Clamped Circular Plate

1972 ◽  
Vol 39 (4) ◽  
pp. 1050-1054 ◽  
Author(s):  
G. C. Kung ◽  
Y.-H. Pao
Keyword(s):  
Circular Plate ◽  
Theoretical Calculations ◽  
Flexural Vibration ◽  
Test Results ◽  
Response Curves ◽  
Axisymmetric Mode ◽  
Dependent Part ◽  
Plate Equations ◽  
Large Amplitude Vibrations ◽  
Good Agreement

Nonlinear flexural vibration of a circular plate clamped at its edge are investigated both experimentally and theoretically. The investigation has been restricted to the first axisymmetric mode. The time-dependent part of the nonlinear plate equations are reduced to Duffing’s equation by applying a one-term Ritz-Galerkin’s procedure. Test results are in good agreement with the theoretical calculations which indicate a non-linearity of hardening type for large amplitude vibrations. The period of vibration decreases by 35 percent when the amplitude is twice the thickness of the plate. The “jumps” in the amplitude-frequency response curves are observed to occur during a transition of a few seconds and are accompanied by a beating phenomenon.

On Carrying Capacity of Concrete Columniation in Seawater by Genetic Algorithms

2011 ◽  
Vol 71-78 ◽  
pp. 914-917
Author(s):  
Yue Zhong Lin
Keyword(s):  
Genetic Algorithms ◽  
Regression Model ◽  
Carrying Capacity ◽  
Theoretical Calculations ◽  
Test Results ◽  
Analysis Method ◽  
Relative Precision ◽  
Good Agreement

According to the data of carrying capacity of concrete columniation in seawater in different circulation times, a non-liner regression model is established between circulation times with carrying capacity of concrete columniation in this paper. The parameter is calculated by Genetic Algorithms, and then the carrying capacity of concrete columniation is calculated with the model. Good agreement is reached between the theoretical calculations with test results; the average relative precision is over 92%. As a result, it can be used to analyze the carrying capacity of concrete columniation in seawater. This analysis method is intelligent.

Analysis of bearing failures in a typical high-power marine gearbox

2018 ◽  
Vol 70 (1) ◽  
pp. 33-41
Author(s):  
Haigang Gu ◽  
Guang Feng ◽  
Yonggang Lin ◽  
Chaozhu Wang
Keyword(s):  
Theoretical Analysis ◽  
Roller Bearing ◽  
Fretting Fatigue ◽  
Test Results ◽  
Content Type ◽  
Bearing Failures ◽  
Manufacturing Errors ◽  
Cylindrical Roller ◽  
Fatigue Failures ◽  
Good Agreement

Purpose This paper aims to analyze fatigue failures of a typical marine gearbox under harsh ocean conditions, and these failures are reasonably attributed to the bearing fretting fatigue damages. Design/methodology/approach Two typical FAG cylindrical roller bearings mounted on this marine gearbox are particularly used for analysis, as they are most vulnerable to these failures. A series of simulations have also been conducted to verify the analysis results and failure reasons by reproducing the fretting fatigue damages for the same shaft-bearing system under the same manufacturing error conditions. Findings The analysis results indicate that manufacturing errors are the most possible reasons for the bearing failures, and these errors have more effects on the FAG cylindrical roller bearing as compared to other bearings mounted on the same shaft system. The simulations results are in good agreement with the theoretical analysis results and test results and hence validate that manufacturing errors are the dominant reasons for bearing fretting fatigue damages in this typical marine gearbox. Originality/value Fatigue failures of a typical marine gearbox. Manufacturing errors are the most possible reasons for the bearing failures. A series of simulations have been conducted to verify the analysis results and failure reasons. The simulations results are in good agreement with the theoretical analysis results and test results.

Theoretical Analysis and Experimental Research on Emergency Release Devices of Loading Arm

2012 ◽  
Vol 468-471 ◽  
pp. 2149-2154
Author(s):  
Jie Wang ◽  
Ye Mu Wang ◽  
Qin Guo Wang
Keyword(s):  
Theoretical Analysis ◽  
Optimum Design ◽  
Experimental Research ◽  
Mathematic Model ◽  
Test Results ◽  
Theory Analysis ◽  
Test Analysis ◽  
Structure Characteristics ◽  
Release Device ◽  
Release Devices

This paper introduces the components and structure characteristics of Loading arms Emergency Release Device(ERD). It establishes mathematic model and carried on theory analysis and test analysis of the ERD. The theory analysis is identical with test results so that it can provide the theory basis for optimum design.

Numerical Simulation on Forming Behavior of Magnesium Alloy at Elevated Temperatures with Experimental Verification

2013 ◽  
Vol 677 ◽  
pp. 179-182
Author(s):  
L.C. Chan ◽  
X.Z. Lu
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Experimental Test ◽  
Experimental Verification ◽  
Elevated Temperatures ◽  
Alloy Sheet ◽  
Forming Limit ◽  
Test Results ◽  
Az31b Alloy ◽  
Good Agreement

This study aimed to predict the formability of AZ31B alloy sheets at elevated temperatures by combining the experimental test with numerical simulation. Forming limit tests were performed to obtain the FLDs of the AZ31B alloy sheet at elevated temperatures of 250 °C and 300 °C. Numerical simulations of warm stamping for a camera case were established based on the forming test results. Furthermore, warm stamping experiments for the camera case were performed to validate the correction of the simulated results. The numerical results show a good agreement with the experimental observations.

Theoretical Analysis on Radial Gate Vibration

2006 ◽  
Author(s):  
Kunihiro Ogihara
Keyword(s):  
Theoretical Analysis ◽  
Model Test ◽  
Pressure Change ◽  
Test Results ◽  
New Approach ◽  
Water Gate ◽  
Pipe Line ◽  
Gate System ◽  
Radial Gate ◽  
Good Agreement

The instability analysis on vibration of radial gate has been done in 1999 under the research project In JPGA (Japan penstock and water gate association) and also the model test of gate vibration has been preceded. The almost theoretical results have been satisfied of the model test results, but there is one point not to be able to explain the relation of natural frequency of gate support system. The instable condition is given by the forth power of frequency of gate system in model test, and the fact that the region of instable becomes smaller as the gate opening larger, is same as the results of theoretical analysis. In this paper, author develop the new approach which is considering the pressure change by stopping the water flow same as water hummer in pipe line. And the unstable analysis on vibration equation of radial gate motion has been done and gotten good agreement on model test results.

Propagation Characteristics of Partial Discharge Signals

2010 ◽  
Vol 11 (3) ◽  
Author(s):  
Cheng Pei ◽  
Xiuchen Jiang ◽  
Fang Song
Keyword(s):  
Theoretical Analysis ◽  
Partial Discharge ◽  
Signal Frequency ◽  
Test Results ◽  
Propagation Characteristics ◽  
Signal Attenuation ◽  
Xlpe Cable ◽  
Transmission Properties ◽  
Frequency Properties ◽  
Good Agreement

With the increased use of partial discharge tests to assess the conduction of shielded distribution cable, PD signal frequency properties of such cables have become increasingly important. It is desirable to detect and locate the PD in the cable before breakdown occurs. Understanding the propagation phenomena of the PD signal in XLPE cable is important to detect and locate the PD signal. In this paper, transmission properties of PD signal were measured and analyzed on a 30m length and 15m length of 11 kV XLPE cable in the laboratory . The experimental results show a good agreement with the theoretical analysis. The paper describes the test results and discusses the PD signal attenuation in time and frequency domain and discusses this with reference to practical PD detection.

Theoretical and experimental research on slip and uplift of the timber-concrete composite beam

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 7079-7099
Author(s):  
Jianying Chen ◽  
Guojing He ◽  
Xiaodong (Alice) Wang ◽  
Jiejun Wang ◽  
Jin Yi ◽  
...  
Keyword(s):  
Differential Equations ◽  
Deformation Theory ◽  
Concrete Slab ◽  
Theoretical Calculations ◽  
Structural Element ◽  
Structural Efficiency ◽  
Theoretical Investigations ◽  
New Type ◽  
Interlayer Slip ◽  
Good Agreement

Timber-concrete composite beams are a new type of structural element that is environmentally friendly. The structural efficiency of this kind of beam highly depends on the stiffness of the interlayer connection. The structural efficiency of the composite was evaluated by experimental and theoretical investigations performed on the relative horizontal slip and vertical uplift along the interlayer between composite’s timber and concrete slab. Differential equations were established based on a theoretical analysis of combination effects of interlayer slip and vertical uplift, by using deformation theory of elastics. Subsequently, the differential equations were solved and the magnitude of uplift force at the interlayer was obtained. It was concluded that the theoretical calculations were in good agreement with the results of experimentation.

Advanced railgun experimental test results and implications for the future

1992 ◽  
Author(s):  
M. HOLLAND ◽  
P. EGGERS ◽  
S. GUINTO ◽  
R. STEVENSON ◽  
GREGORY COLOMBO
Keyword(s):  
Experimental Test ◽  
Test Results ◽  
The Future
Sign in / Sign up

Export Citation Format

Share Document