Design procedure according to Eurocode 7 and analysis of the test results

2020 ◽  
pp. 275-303
Author(s):  
C. Bauduin
Keyword(s):  
Design Procedure ◽  
Test Results ◽  
Eurocode 7

Numerical Design of Stepped Compound Horn with Longitudinal-Torsional Vibration under Single Acoustic Excitation

2014 ◽  
Vol 621 ◽  
pp. 385-391
Author(s):  
Jian Xin Zheng ◽  
Jie Han ◽  
Chuan Shao Liu
Keyword(s):  
Acoustic Wave ◽  
Torsional Vibration ◽  
Longitudinal Vibration ◽  
Design Procedure ◽  
Geometrical Parameters ◽  
Acoustic Excitation ◽  
Test Results ◽  
Acoustic Wave Propagation ◽  
Element Analysis ◽  
Geometrical Dimensions

The mechanism of longitudinal-torsional vibration (LTV) realized by using converter with multiple diagonal slits (MDS) was analyzed based on the acoustic wave propagation when acoustic wave enters obliquely from steel to air. The influences of geometrical parameters of the stepped compound horn with multiple diagonal slits on natural frequencies of LTV were studied with finite element analysis (FEA). The design procedure of stepped compound horn with LTV was provided. The vibration characteristics of actual horn were analyzed with simulation and test. The FEA results show that LTV of the output end of the stepped compound horn may be realized when the input end is excited by longitudinal vibration at certain natural frequency if suitable geometrical dimensions are selected, and the amplitude of the horn is periodical; the trajectory of the particle in the output end is helical curve. The test results indicate that LTV may be realized by stepped compound horn under single acoustic excitation, and the vibration frequency is close to the simulation result, and its vibration properties are good. This method may be applied to design the acoustics system of ultrasonic machining with LTV under single acoustic excitation.

Earthquake-induced hydrodynamic forces on reservoir roofs

2010 ◽  
Vol 37 (8) ◽  
pp. 1107-1115 ◽  
Author(s):  
Michael Isaacson
Keyword(s):  
Laboratory Test ◽  
Storage Tank ◽  
Water Surface ◽  
Design Procedure ◽  
Hydrodynamic Forces ◽  
Surface Elevation ◽  
Test Results ◽  
Hydrodynamic Loads ◽  
Laboratory Test Results ◽  
New Formulation

The present paper describes the hydrodynamic loads on the roof of a water-filled reservoir or storage tank due to earthquake-induced sloshing. Initially, the paper summarizes available solutions for the water surface elevation in a rectangular reservoir subjected to harmonic and earthquake base motions, and as well an available formulation for the force on the roof of a rectangular reservoir. With this background, a new formulation for the force on the roof is developed, and selected results based on this are presented. A recommended design procedure is thereby proposed, and an example application is provided. The potential extension of the proposed formulation to other reservoir configurations is discussed. Although a validation of the proposed formulation based on laboratory test results is needed, it is suggested that in the interim the proposed formulation is adopted for design.

Performance Investigations of Large Capacity Centrifugal Compressors

1978 ◽  
Author(s):  
H. Mishina ◽  
I. Gyobu
Keyword(s):  
Pressure Ratio ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Design Procedure ◽  
Test Results ◽  
Three Dimensional Flow ◽  
Loss Analysis ◽  
Area Distribution ◽  
Specific Speed ◽  
Sectional Shape

An experimental investigation concerning the optimum relative velocity distribution within impellers, the optimum diffusion ratio of vaned diffusers and the optimum circumferential area distribution, sectional shape of scrolls was carried out using high specific speed shrouded impellers with backward leaning blades. A performance design procedure based on loss analysis and quasi-three-dimensional flow analysis was also developed and modified by introducing experimental results. The design procedure was applied to a 7900-kw four-stage air compressor to demonstrate the usefulness. Field test results of the complete machine showed that the maximum isothermal efficiency was 75 percent with the pressure ratio of 5.96 and the flow rate of 29.3 m3/s.

scholarly journals Predict of Asphalt Rutting Potential Based on IDT and Validation with ANN

2019 ◽  
Vol 9 (2) ◽  
pp. 131-138
Author(s):  
Hassan Divandari
Keyword(s):  
Low Cost ◽  
Permanent Deformation ◽  
Design Procedure ◽  
Mix Design ◽  
Test Results ◽  
Simple Test ◽  
Short Term ◽  
Time Saving ◽  
Simple Method ◽  
Main Method

Abstract Rutting occurs due to accumulation of incrementally small permanent deformations from each load application and it can cause irreparable problems in pavements. On the other hand, the Marshall Mix design which is known as the main method in Iran, the lack of a simple test to determine specimen resistance to permanent deformation as the major reason for asphalt rutting is noticeable. Although today many devices are used for rutting measurement, none of them have the ability to use in wider field. In addition, prevalent methods of evaluating rutting potential are usually costly and time consuming. Mentioned parameters illustrate the necessity of developing a simple method, not only having fine precision, but also are able to predict rutting performance with low cost in the short term in laboratory. In this research, after performing the main tests on specimens, IDT test results and Marshall Parameters were used to develop a mathematical model to estimate specimen rut depth. The model is validated by using ANN and makes it possible to evaluate mixtures rutting potential while OBC is being determined in laboratory. So not only is there no need to use expensive instruments of rutting test, but also a remarkable time saving in mix design procedure is achievable.

scholarly journals Enhancing Vibration Reduction on Lightweight Lower Control Arm

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Alessandro Messana ◽  
Alessandro Ferraris ◽  
Andrea G. Airale ◽  
Alessandro Fasana ◽  
Massimiliana Carello
Keyword(s):  
Mechanical Performance ◽  
Dynamic Properties ◽  
Damping Ratio ◽  
Vibration Reduction ◽  
Design Procedure ◽  
Test Results ◽  
Hybrid Lca ◽  
Original Solution ◽  
Lower Control Arm ◽  
Real Behavior

This paper describes the design procedure to enhance the damping properties of a multimaterial lightweight suspension arm for a C-segment vehicle. An innovative viscoelastic material has been used to join carbon fiber with steel that has a function of passive constrained layer damper and adhesive simultaneously. Therefore, the hybrid technology applied has been focused on reducing the LCA mass, diminishing the steel thickness, and adding a CFRP tailored cover without compromising the global mechanical performance. Particular attention has been paid to the investigation of the dynamic response in terms of vibration reduction, especially in the range of structure-borne frequencies of 0–600 Hz. Two different viscoelastic materials have been evaluated in such a way to compare their stiffness, damping, and dynamic properties. The experimental test results have been virtually correlated with a commercial FEM code to create the respective material card and predict the real behavior of the LCAs (original and hybrid). The experimental modal analysis has been performed and compared on both the arms highlighting a very good correlation between virtual and experimental results. In particular, the hybrid LCA allows an interesting improvement of damping ratio, about 3,5 times higher for each eigenmode than in the original solution.

A Fatigue-Life Model of a Rubber Bushing

1980 ◽  
Vol 53 (5) ◽  
pp. 1226-1238 ◽  
Author(s):  
H. L. Oh
Keyword(s):  
Fatigue Life ◽  
Energy Balance ◽  
Design Procedure ◽  
Test Results ◽  
Performance Requirement ◽  
Life Model ◽  
Rubber Bushing

Abstract A major performance requirement for a rubber bushing is durability. The model for fatigue life of a bushing given in Equation (4) was derived using an energy balance concept (energy available versus energy required to extend a tear). This model agreed well with test results. A design procedure was developed from the model which gives the optimum insert geometry for maximum bushing life.

scholarly journals Design Procedure of Robust QFT-Based Controller for Continuous-Flow Grain Dryer Plant

2011 ◽  
Vol 328-330 ◽  
pp. 2318-2323
Author(s):  
H. Mansor ◽  
S.B. Mohd Noor ◽  
R.K. Raja Ahmad ◽  
F.S Taip
Keyword(s):  
Continuous Flow ◽  
Pid Controller ◽  
Design Procedure ◽  
Industrial Applications ◽  
Test Results ◽  
Robust Controller ◽  
Plant Uncertainty ◽  
Product Output ◽  
Better Than

Quantitative Feedback Theory (QFT) is a well known robust controller that deals with plant uncertainty. QFT has been applied to many industrial applications, however it never been applied to any types of grain dryer plant. Grain dryer plant prone to parameter uncertainty and needs a robust controller in order to maintain a good quality of product output. The objective of this paper is to explain step-by-step design procedure of QFT design for a continuous-flow grain dryer plant. The designed QFT-based controller is also tested and compared with PID controller via simulation. The test results showed that the QFT-based controller works better than PID controller in terms of shorter settling time and smaller percentage of overshoot for the grain dryer plant under study and at the same time insensitive to parameter changes i.e. input and output disturbances.

scholarly journals A Contribution to the Study of the Design of an Industrial Centrifugal Compressor

1984 ◽  
Author(s):  
K. D. Papailiou ◽  
G. Bois
Keyword(s):  
Centrifugal Compressor ◽  
Design Procedure ◽  
Test Results ◽  
Interesting Point ◽  
Axial Part ◽  
Starting Point ◽  
Compressor Design ◽  
The Impact ◽  
Geometrical Dimensions ◽  
New Machine

The present work has had as a starting point an already existing high hub/tip ratio industrial centrifugal compressor design. An effort was undertaken to design a first new machine using theoretical methods, keeping, however, the overall geometrical dimensions, issued from the experience of the industry. The new design was manufactured and tested. The test results were found to be rather good, compared with the current industrial experience. Additionally, a second new design was undertaken which had as aim to diminish the axial part length, leaving untouched the hub/tip ratio. If this effort was successful, it would mean that the length of the shaft for a multistage arrangement could be diminished and, thus the need for such a high hub/tip ratio, resulting from the shaft diameter. It was found, actually, possible to reduced the axial length of the inducer by a factor of two, approximately. The second new design was manufactured and the resulting machine, when tested, was found to have the same performances as the first new design. A rather interesting point of the whole design procedure was the fact that a boundary layer calculation method was used in the blade-to-blade surface, which could take into account the influence of the Coriolis force and blade curvature on turbulence. The impact of this influence on the whole design was found to be decisive. The calculation procedure, the two designs and the overall test rests are described in the present work.

Debonding Limit of the Externally Glued FRP Reinforcements Applied on Clay Brick Substrate: Statistical Assessment of a Design Formula

2014 ◽  
Vol 624 ◽  
pp. 486-493
Author(s):  
Pietro Carrara ◽  
Francesco Freddi
Keyword(s):  
Design Procedure ◽  
Fiber Reinforced Polymer ◽  
Test Results ◽  
Clay Brick ◽  
Present Contribution ◽  
Clay Bricks ◽  
Reinforced Polymer ◽  
Alternative Formula ◽  
Testing Approach ◽  
Composite Fabrics

The present contribution aims to statistically assess a design procedure to estimate the bond resistance of composite fabrics externally glued on clay brick masonry substrates. Based on recent experimental campaigns a database of bond test results between fiber reinforced polymer and clay bricks is collected and an alternative formula is proposed starting from theoretical and experimental evidence. Then, its characteristic value is evaluated following the "Design Assisted by Testing Approach" suggested in the Eurocode 0. The capabilities of the proposed method are statistically evaluated and the advantages with respect to existing formulas are discussed.

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