Test rig for micro gear and experimental analysis on the meshing condition and failure characteristics of steel micro involute gear and metallic glass one

2010 ◽  
Vol 45 (12) ◽  
pp. 1797-1812 ◽  
Author(s):  
M.E. Niza ◽  
M. Komori ◽  
T. Nomura ◽  
I. Yamaji ◽  
N. Nishiyama ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Experimental Analysis ◽  
Test Rig ◽  
Failure Characteristics ◽  
Involute Gear

scholarly journals Experimental Analysis of Power Flows in the Regenerative Vibration Reduction System with a Magnetorheological Damper

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 848
Author(s):  
Bogdan Sapiński ◽  
Paweł Orkisz ◽  
Łukasz Jastrzębski
Keyword(s):  
Experimental Data ◽  
Experimental Analysis ◽  
Vibration Reduction ◽  
Mr Damper ◽  
Magnetorheological Damper ◽  
Test Rig ◽  
Instantaneous Power ◽  
Reduction System ◽  
Inertial Energy ◽  
Regenerative Vibration

The aim of the work is to investigate power flows in the vibration reduction system equipped with a magnetorheological (MR) damper and energy regeneration. For this purpose, experiments were conducted in the test rig compound of the shaker and the vibration reduction system (electromagnetic harvester, MR damper, spring) which are attached to the sprung mass. The experimental data acquired under sine excitations enabled us to analyze instantaneous power fluxes, as well as a rate of inertial energy changes in the system.

Versatile lab‐scale test rig for experimental analysis and heat transfer modelling of thermally activated building systems

2020 ◽  
Vol 2 (5) ◽  
Author(s):  
Ana Tejero‐González ◽  
Eloy Velasco‐Gómez ◽  
Manuel Andrés‐Chicote ◽  
Francisco Javier Rey‐Martínez
Keyword(s):  
Heat Transfer ◽  
Experimental Analysis ◽  
Test Rig ◽  
Thermally Activated ◽  
Building Systems ◽  
Scale Test ◽  
Transfer Modelling

scholarly journals Experimental Analysis of Epoxy Bonded Beams with GFRP Laminates

2019 ◽  
Vol 9 (1) ◽  
pp. 7042-7044
Keyword(s):  
Glass Fiber ◽  
Experimental Analysis ◽  
Crack Pattern ◽  
Flexural Behavior ◽  
Reinforced Concrete Structures ◽  
Failure Characteristics ◽  
Reinforced Beams ◽  
Polymer Sheets ◽  
Increasing Trend ◽  
Concentrated Loading

External wrapping or retrofitting of polymer sheets are used in concrete and reinforced concrete structures is an increasing trend present. This paper evaluates the flexural behavior of beams retrofitted externally with GFRP laminates. Experimental plan deals with static experimental analysis. Reinforced beams of sizes 200×250×3500mm are casted for a grade of M35. Reinforced beams are externally retrofitted with E-glass fiber polymers. Beams are epoxy bonded to the GFRP laminates. Beams are tested under monotonic two point concentrated loading. Load – Deflection characteristics, crack pattern and failure characteristics of beam are analyzed.

Experimental Analysis of the Dynamic Characteristics of a Foil Thrust Bearing

2014 ◽  
Author(s):  
Franck Balducchi ◽  
Mihai Arghir ◽  
Romain Gauthier
Keyword(s):  
Dynamic Characteristics ◽  
Experimental Analysis ◽  
Dynamic Models ◽  
Thrust Bearing ◽  
Dynamic Stiffness ◽  
Excitation Frequency ◽  
Test Rig ◽  
Equivalent Damping ◽  
Start Up ◽  
Foil Thrust Bearing

The paper deals with the experimental analysis of the dynamic characteristics of a foil thrust bearing (FTB) designed following the specifications given by NASA in 2009. The start-up characteristics of the same foil bearing were investigated in a recently published paper. The test rig used for start-up measurements was adapted for dynamic measurements. The paper presents the test rig in detail as well as its identified dynamic models. Measurements of the dynamic characteristics of the bump foil structure were performed for static loads comprised between 30 N and 150 N while measurements for the FTB were performed at 35 krpm for 30 N, 60 N and 90 N. Excitation frequencies were comprised between 150 Hz and 750 Hz. Results showed that the dynamic stiffness of the FTB increase with excitation frequency while the equivalent damping decreases. Both stiffness and damping increase with the static load but are smaller at 35 krpm compared to 0 rpm.

Experimental analysis of control loops with different delay times in the supply air system of a radiator test rig

2011 ◽  
Vol 43 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Yongpan Chen ◽  
Jili Zhang ◽  
Zhen Lu ◽  
Tianyi Zhao ◽  
Hui Liu
Keyword(s):  
Experimental Analysis ◽  
Test Rig ◽  
Control Loops ◽  
Delay Times ◽  
Air System

Fragmentation of Co-Fe-Ta-B Bulk Metallic Glass

2014 ◽  
Vol 782 ◽  
pp. 553-556
Author(s):  
Jozef Miškuf ◽  
Kornel Csach ◽  
Alena Juríková
Keyword(s):  
Fracture Surface ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Metallic Glasses ◽  
Room Temperature ◽  
Amorphous Structure ◽  
External Loading ◽  
Small Particles ◽  
Failure Characteristics ◽  
Crack Propagation Direction

The main limitation of bulk metallic glasses for their application as structural materials is the large brittleness under the external loading. We analyzed the failure characteristics of Co43Fe20Ta5.5B31.5(at.%) bulk metallic glass deformed in a compression at the room temperature and a low strain rate. Under loading the amorphous structure can store high elastic energy. During the failure this energy is released and the alloy breaks into small particles or powder exhibiting a fragmentation mode. The nanoscale fracture surface morphology respects the micromechanisms of failure of the amorphous structure. The fracture surface consists of a smooth mirror cleavage zone and a river pattern zone with the nanosized dimples arranged in lines respecting the periodic corrugation zones oriented perpendicular to the crack propagation direction.

Experimental analysis of the influence of polymer solutions on performances and cavitation of small size pumps for professional appliances

2020 ◽  
pp. 095440892093819
Author(s):  
Fabio Burlon ◽  
Diego Micheli ◽  
Michele Simonato ◽  
Riccardo Furlanetto
Keyword(s):  
Aqueous Solutions ◽  
Control Strategy ◽  
Experimental Analysis ◽  
High Frequency ◽  
Early Stage ◽  
Pure Water ◽  
Test Rig ◽  
Pump Operation ◽  
Performance Curves ◽  
High Frequency Vibrations

Pumps used in professional appliances process a solution of water, soils residues and detergents. These affect vapor tension, viscosity and rheology of the solution, mainly due to the presence of surfactants and polymers. Only a few studies have been found on how these substances can influence pump performances. Therefore, an experimental analysis has been carried out with aqueous solutions of a detergent component, the Polyox WSR 301, in the concentration range of 100–7000 ppm, to evaluate their influence on pump performances and cavitation. Some properties of the solutions have been preliminary characterized with a rheometer. Then, each solution has been tested in a dedicated test rig, to compare the performance curves of a centrifugal pump used in professional warewashing machines with those obtained with pure water. A non-intrusive method, based on the investigation of high frequency vibrations and noise signals, has been developed to detect cavitation at its early stage of inception. It was observed that polymer mitigates cavitating pump vibrations, with a reduction of the acceleration to less than one g. The analysis has provided the data necessary for the successive development of a control strategy for pump operation in professional appliances.

Experimental Analysis of High-Efficient Centrifugal Gas-Liquid Separators

2008 ◽  
Author(s):  
Lixin Zhao ◽  
Baojun Zhu ◽  
Yue Wang
Keyword(s):  
Flow Field ◽  
Experimental Research ◽  
Test Data ◽  
Experimental Analysis ◽  
Normal Gravity ◽  
Test Rig ◽  
Structural Scheme ◽  
Gravity Settling ◽  
High Efficient ◽  
Interior Flow

Application background of gas-liquid separators is introduced. Centrifugal gas-liquid separators have many advantages, which are analyzed by comparing with normal gravity settling facilities. Experimental research was carried out. Test rig and facilities are described. Test prototypes are transparent plexi-glass separators. Through transparent prototypes, interior flow field can be observed clearly. Experimental phenomena of different structure plexi-glass prototypes are compared with and analyzed, some test photos were recorded. Test data of plexi-glass prototypes were obtained. Results show that the separating performance of the centrifugal gas-liquid separators is satisfactory. The structural scheme of high-efficient separator design is concluded.

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