Research on the Vibration of Drilling Derrick

2010 ◽  
Vol 139-141 ◽  
pp. 2368-2371
Author(s):  
Tie Yan ◽  
Chun Jie Han
Keyword(s):  
Torsional Vibration ◽  
Harmonic Vibration ◽  
Vibration State ◽  
Set Up ◽  
Modal Vibration ◽  
Basic Equipment

Derrick is the basic equipment during drilling, fatigue and failure are the problems that effect drilling efficiency, the strong vibration of derrick is the main reason that caused derrick failure. The various kinds of vibration of drilling derrick are analyzed in this paper. The model of derrick JJ60/38-W is set up, the phenomena of vibration of derrick are studied, and the vibration state behaves many dynamic situations under the bad condition, including axial, lateral, torsional vibration. These vibrations are studied; the rule of various kinds of vibration is obtained. The modal vibration and harmonic vibration are analyzed, the situation of harmonic vibration of different nodes of derrick are obtained. The software ANSYS is applied in this paper, the result can be used for the actual drill case.

The Study on Harmonic Vibration of Drill String in Horizontal Well

2010 ◽  
Vol 139-141 ◽  
pp. 2397-2400
Author(s):  
Chun Jie Han ◽  
Tie Yan
Keyword(s):  
Horizontal Well ◽  
Drill String ◽  
Harmonic Vibration ◽  
Well Drilling ◽  
Harmonic Vibrations ◽  
String Vibrations ◽  
Resonance Frequencies ◽  
Set Up ◽  
Drill Tool ◽  
Modal Vibration

During exploitation of horizontal well drilling engineering, the problem of drill string failure is very serious, there are many reasons, and drill string vibrations are main reasons. In this paper drill string of horizontal well is object being studied. The models about various vibrations are set up. The vibration rule of drill string is obtained under different situation; the axial and lateral frequency of drill string vibration in free state is studied. The analysis of modal vibration of drill string is the basis of the analysis of harmonic vibration of drill string. The harmonic vibrations rules of drill string of horizontal well are studied. All sorts of resonance frequencies are obtained practicability. This study can prove basic method for optimizing drill tool of horizontal well and reducing drill string failure.

Design of Torsional Vibration Controller for Motor-Gearbox/Differential Drive System of Electric Vehicles

2013 ◽  
Vol 437 ◽  
pp. 56-61 ◽  
Author(s):  
Jian Fu Xu ◽  
Peng Yu ◽  
Tong Zhang ◽  
Rong Guo
Keyword(s):  
State Space ◽  
Electric Vehicles ◽  
Torsional Vibration ◽  
Driving Performance ◽  
Drive System ◽  
Linear Quadratic ◽  
Differential Drive ◽  
Set Up ◽  
Mass Spring ◽  
Space Equation

A torsional controller is proposed for the motor-gearbox/differential drive system of electric vehicles to suppress the torsional vibration of the system. The drive system is simplified to a 2-mass spring damper system, and the state-space equation is set up. A controller consisting of linear quadratic regular (LQR) and state observer is designed. The results of simulation show that LQR can suppress the torsional vibration effectively, enhancing the driving performance of the vehicle.

scholarly journals Structural Modifications for Torsional Vibration Control of Shafting Systems Based on Torsional Receptances

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Zihao Liu ◽  
Wanyou Li ◽  
Huajiang Ouyang
Keyword(s):  
Vibration Control ◽  
Torsional Vibration ◽  
Structural Data ◽  
Element Model ◽  
Mode Shapes ◽  
Structural Modifications ◽  
Shaft System ◽  
Vibration Problems ◽  
Set Up ◽  
Levels Of Integration

Torsional vibration of shafts is a very important problem in engineering, in particular in ship engines and aeroengines. Due to their high levels of integration and complexity, it is hard to get their accurate structural data or accurate modal data. This lack of data is unhelpful to vibration control in the form of structural modifications. Besides, many parts in shaft systems are not allowed to be modified such as rotary inertia of a pump or an engine, which is designed for achieving certain functions. This paper presents a strategy for torsional vibration control of shaft systems in the form of structural modifications based on receptances, which does not need analytical or modal models of the systems under investigation. It only needs the torsional receptances of the system, which can be obtained by testing simple auxiliary structure attached to relevant locations of the shaft system and using the finite element model (FEM) of the simple structure. An optimization problem is constructed to determine the required structural modifications, based on the actual requirements of modal frequencies and mode shapes. A numerical experiment is set up and the influence of several system parameters is analysed. Several scenarios of constraints in practice are considered. The numerical simulation results demonstrate the effectiveness of this method and its feasibility in solving torsional vibration problems in practice.

Dynamic Analysis of Multistage Gear Driven System of Wind Turbine

2010 ◽  
Vol 29-32 ◽  
pp. 1706-1710 ◽  
Author(s):  
Yong Qian Liu ◽  
Quan Long ◽  
Yong Ping Yang
Keyword(s):  
Wind Turbine ◽  
Torsional Vibration ◽  
Optimization Design ◽  
Vibration Mode ◽  
System Optimization ◽  
Parameter Method ◽  
Lumped Parameter ◽  
Driven System ◽  
Set Up ◽  
Lumped Parameter Method

At present, wind power is developing rapidly. Gearbox is one of the key components of wind turbine. The equivalent dynamic model of the wind turbine gear driven system was established with lumped-parameter method, and the differential equations of torsional vibration were set up based on Newton Second Principle; the natural frequency and main vibration mode of the gear driven system were calculated and the characteristics of the vibration shapes were analyzed. The results have established basic for dynamic response calculation and analysis of the gear driven system, and provides a reference for system optimization design.

Torsional-Vibration Action Research on the Diesel Engine Crankshaft

2011 ◽  
Vol 199-200 ◽  
pp. 769-772 ◽  
Author(s):  
Xiao Qing Tian ◽  
Shi Ying Liu ◽  
Guo Dong Ding
Keyword(s):  
Diesel Engine ◽  
New Product Development ◽  
Torsional Vibration ◽  
Vibration Amplitude ◽  
3D Model ◽  
New Product ◽  
Engine Design ◽  
Vibration Action ◽  
Set Up ◽  
Engine Crankshaft

Abuse conditions of torsion and vibration occurred on crankshaft should be eliminated or diminished during the engine design process. 3D model of the crankshaft is set up by means of the simplified crankshaft system, using the concentrated quality method. FEA software was used for analyzing the different vibration amplitude orders. Two models with absorber and without absorber were compared and tested. The results of torsional vibration amplitudes-speed and so on are benefit to the new product development for eliminating the potential mechanical harm.

The Effects of Drying Techniques on Clay-Rich Soil Texture

1974 ◽  
Vol 32 ◽  
pp. 466-467
Author(s):  
T. G. Naymik
Keyword(s):  
Critical Point ◽  
Liquid Nitrogen ◽  
Liquid Nitrogen Temperature ◽  
Drying Methods ◽  
Air Drying ◽  
Freeze Dried ◽  
Critical Point Drying ◽  
Set Up ◽  
The Relationship ◽  
Quartz Grains

Three techniques were incorporated for drying clay-rich specimens: air-drying, freeze-drying and critical point drying. In air-drying, the specimens were set out for several days to dry or were placed in an oven (80°F) for several hours. The freeze-dried specimens were frozen by immersion in liquid nitrogen or in isopentane at near liquid nitrogen temperature and then were immediately placed in the freeze-dry vacuum chamber. The critical point specimens were molded in agar immediately after sampling. When the agar had set up the dehydration series, water-alcohol-amyl acetate-CO2 was carried out. The objectives were to compare the fabric plasmas (clays and precipitates), fabricskeletons (quartz grains) and the relationship between them for each drying technique. The three drying methods are not only applicable to the study of treated soils, but can be incorporated into all SEM clay soil studies.

Evaluation of Freezing Methods by Low Temperature X-Ray Diffraction

1977 ◽  
Vol 35 ◽  
pp. 330-333
Author(s):  
T. Gulik-Krzywicki ◽  
M.J. Costello
Keyword(s):  
Biological Materials ◽  
Molecular Organization ◽  
X Ray Diffraction ◽  
Glass Capillary ◽  
X Ray ◽  
Rate Dependent ◽  
Before And After ◽  
Freeze Etching ◽  
Diffraction Patterns ◽  
Set Up

Freeze-etching electron microscopy is currently one of the best methods for studying molecular organization of biological materials. Its application, however, is still limited by our imprecise knowledge about the perturbations of the original organization which may occur during quenching and fracturing of the samples and during the replication of fractured surfaces. Although it is well known that the preservation of the molecular organization of biological materials is critically dependent on the rate of freezing of the samples, little information is presently available concerning the nature and the extent of freezing-rate dependent perturbations of the original organizations. In order to obtain this information, we have developed a method based on the comparison of x-ray diffraction patterns of samples before and after freezing, prior to fracturing and replication.Our experimental set-up is shown in Fig. 1. The sample to be quenched is placed on its holder which is then mounted on a small metal holder (O) fixed on a glass capillary (p), whose position is controlled by a micromanipulator.

Eels Under Standing Wave Conditions

1982 ◽  
Vol 40 ◽  
pp. 492-495
Author(s):  
O.L. Krivanek ◽  
J. TaftØ
Keyword(s):  
Standing Wave ◽  
Wave Conditions ◽  
Set Up ◽  
A Site ◽  
Complex Crystal

It is well known that a standing electron wavefield can be set up in a crystal such that its intensity peaks at the atomic sites or between the sites or in the case of more complex crystal, at one or another type of a site. The effect is usually referred to as channelling but this term is not entirely appropriate; by analogy with the more established particle channelling, electrons would have to be described as channelling either through the channels or through the channel walls, depending on the diffraction conditions.

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