scholarly journals Simultaneous energy harvesting and tribological property improvement

Friction ◽  
2021 ◽  
Author(s):  
Xiaofan Wang ◽  
Jiliang Mo ◽  
Huajiang Ouyang ◽  
Zaiyu Xiang ◽  
Wei Chen ◽  
...  
Keyword(s):  
Test Bench ◽  
Original System ◽  
Vibration Energy ◽  
Surface Wear ◽  
Friction Test ◽  
Vibration Acceleration ◽  
Piezoelectric Elements ◽  
Two Degree Of Freedom ◽  
Friction Induced Vibration ◽  
Vibration Noise

AbstractIn this study, piezoelectric elements were added to a reciprocating friction test bench to harvest friction-induced vibration energy. Parameters such as vibration acceleration, noise, and voltage signals of the system were measured and analyzed. The results show that the piezoelectric elements can not only collect vibration energy but also suppress friction-induced vibration noise (FIVN). Additionally, the wear of the friction interface was examined via optical microscopy (OM), scanning electron microscopy (SEM), and white-light interferometry (WLI). The results show that the surface wear state improved because of the reduction of FIVN. In order to analyze the experimental results in detail and explain them reasonably, the experimental phenomena were simulated numerically. Moreover, a simplified two-degree-of-freedom numerical model including the original system and the piezoelectric system was established to qualitatively describe the effects, dynamics, and tribological behaviors of the added piezoelectric elements to the original system.

Energy Harvesting for Autonomous Sensing

2007 ◽  
Vol 347 ◽  
pp. 405-410 ◽  
Author(s):  
Daniel J. Inman ◽  
Justin Farmer ◽  
Benjamin L. Grisso
Keyword(s):  
Power Source ◽  
Ambient Vibration ◽  
Vibration Energy ◽  
Computational Algorithms ◽  
Wireless Power ◽  
Sensing System ◽  
Autonomous Sensor ◽  
Damage Monitoring ◽  
Piezoelectric Elements ◽  
External Connections

Autonomous, wireless structural health monitoring is one of the key goals of the damage monitoring industry. One of the main roadblocks to achieving autonomous sensing is removing all wiring to and from the sensor. Removing external connections requires that the sensor have its own power source in order to be able to broadcast/telemetry information. Furthermore if the sensor is to be autonomous in any way, it must contain some sort of computing and requires additional power to run computational algorithms. The obvious choice for wireless power is a battery. However, batteries often need periodical replacement. The work presented here focuses on using ambient energy to power an autonomous sensor system and recharge batteries and capacitors used to run an active sensing system. In particular, we examine methods of harvesting energy to run sensor systems from ambient vibration energy using piezoelectric elements.

scholarly journals Fault Diagnosis for a Class of Robotic Systems with Application to 2-DOF Helicopter

2020 ◽  
Vol 10 (23) ◽  
pp. 8359
Author(s):  
Luis Alejandro Ramírez ◽  
Manuel Alejandro Zuñiga ◽  
Gerardo Romero ◽  
Efraín Alcorta-García ◽  
Aldo Jonathan Muñoz-Vázquez
Keyword(s):  
Fault Diagnosis ◽  
Original System ◽  
Research Area ◽  
Fault Detection And Isolation ◽  
Specific Class ◽  
Sensors And Actuators ◽  
Challenging Research ◽  
Classic Approach ◽  
Generalized Hamiltonian System ◽  
Two Degree Of Freedom

This paper considers a general approach to fault diagnosis using a generalized Hamiltonian system representation. It can be considered that, in general, nonlinear systems still represent a problem in fault diagnosis because there are results only for a specific class of them. Therefore, fault diagnosis remains a challenging research area despite the maturity of some of the available results. In this work, a type of nonlinear system that admits a generalized Hamiltonian representation is considered; in practice, there are many systems that have this kind of representation. Thereupon, an approach for fault detection and isolation based on the Hamiltonian representation is proposed. First, following the classic approach, the original system is decoupled in different subsystems so that each subsystem is sensitive to one particular fault. Then, taking advantage of the structure, a simple way to design the residuals is presented. Finally, the proposed scheme is validated at the two-degree of freedom (DOF) helicopter of Quanser®, where the presence of faults in sensors and actuators were considered. The results show the efficacy of the proposed scheme.

Enhanced Vibration Energy-Harvesting Using Inerter-Based Two-Degree-of-Freedom System

2018 ◽  
Author(s):  
Mingyi Liu ◽  
Wei-Che Tai ◽  
Lei Zuo
Keyword(s):  
Energy Harvesting ◽  
Degree Of Freedom ◽  
Power Stroke ◽  
Specific Power ◽  
Vibration Energy ◽  
Frequency Bandwidth ◽  
Vibration Energy Harvesting ◽  
Sdof System ◽  
Harvesting Systems ◽  
Two Degree Of Freedom

In rotational electromagnetic generator based vibration energy-harvesting systems, the generator rotor is an inerter. From analysis, it is found that the inerter decreases system frequency bandwidth in single-degree-of-freedom (SDOF) energy-harvesting systems. The maximum electric power output of a SDOF system is limited by mechanical damping and maximum stroke that allowed. Two-degree-of-freedom (2DOF) energy-harvesting systems was proposed in recent years and has been shown to have the potential to have better power, power/stroke ratio, and frequency bandwidth performance compared with SDOF systems. However, extra mass has to be added in most of the case. In this paper, a new design of inerter-based-2DOF energy-harvesting system was proposed by adding a spring in series with the inerter in SDOF system. No extra mass is added compared with its counterpart SDOF system. Optimal specific power at limited stroke were obtained by tuning system parameters, which includes resonance frequency ratio, spring ratio, mass ratio, and damping ratio. The contribution of each parameter to system performance was analyzed. The results show that the proposed inerter-based-2DOF system has better performance compared with the SDOF system. The inerter-based-2DOF can have larger specific power and larger power/stroke ratio over a wider frequency bandwidth. Simulation also show that improved performance not only obtained with sinusoidal excitation with constant displacement amplitude, but also with sinusoidal excitation with constant force amplitude.

Development of a Multifunctional Abrasion and Friction Test Bench with High Ambient Pressure for Seawater Hydraulics

2013 ◽  
Vol 336-338 ◽  
pp. 916-923
Author(s):  
You Sheng Yang ◽  
Qi Zhang ◽  
Song Lin Nie
Keyword(s):  
Deep Sea ◽  
Test Bench ◽  
Material Selection ◽  
Ambient Pressure ◽  
Rotating Cylinder ◽  
Hydraulic Pump ◽  
Friction Test ◽  
Sliding Bearing ◽  
Technical Requirements ◽  
High Ambient Pressure

Seawater hydraulic pump, of which the performances and service life are highly dependent on the structural design and material selection of the friction pairs and sliding bearing, are the power componentof the seawater hydraulic systems. Based on the previous studies, a seawater abrasion and friction test bench with high ambient pressure (≧20MPa) is to be developed for deep-sea (≧2000m) application environments. The technical requirements are presented and comparison analyses have been made between two testing schemes: rotating cylinder-blockscheme and rotating swash-plate scheme. Details are presented on the designs of the three key friction pairs and sliding bearing of the rotating cylinder-block bench. This research provides a test bench for the design of key parts in deep-sea water hydraulic pump/motor and the studies of the related theories (such as the friction and wear theory, lubrication and bearing mechanism).

Study of a Two-Phase Flow Pump and Separator System

2010 ◽  
Author(s):  
Franc¸ois Gruselle ◽  
Johan Steimes ◽  
Patrick Hendrick
Keyword(s):  
Liquid Phase ◽  
Test Bench ◽  
Two Phase Flow ◽  
Original System ◽  
Phase Flow ◽  
Two Phase ◽  
Specific Test ◽  
Efficient System ◽  
Flow Models ◽  
Working Parameters

The Aero-Thermo-Mechanics (ATM) Department of ULB (Universite´ Libre de Bruxelles) is developing an original system to pump and separate a two-phase flow. Many applications need to extract a certain phase of a multiphase flow: oil extraction, flow in nuclear pumps, flow in aircraft lubrication systems, pulp and paper processing, etc. The main objective of this study is to obtain a lightweight, compact and efficient system that can both extract the gas of a two-phase flow and increase the pressure of the liquid phase. Prototypes with different designs were first tested at ULB on a specific test bench using water and air. The current prototype is a kind of axial-centrifugal pump. The axial part is used to separate the two phases of the flow and to collect, in the centrifugal part, the liquid phase only. The test results of the water-air prototypes have allowed to identify the key design and working parameters for efficient separation and pumping. A theoretical model has also been developed to describe the behavior of these prototypes. After successful tests with water-air mixtures, the technology has been implemented for a hot oil-air mixture. The tests with oil-air mixtures are performed on the aeroengine lubrication system test bench that the ATM Department developed and continues developing for other projects. At the same time, the flow field in the pump and separator system is being studied with commercial CFD (Computational Fluid Dynamics) software packages. Several two-phase flow models are considered for this particular application.

scholarly journals Analyzing mechanical vibrations of an aircraft opposed piston engine

2021 ◽  
Author(s):  
Michał Biały ◽  
Łukasz Grabowski ◽  
Bartłomiej Skórzyński ◽  
Grzegorz Barański ◽  
Adam Majczak
Keyword(s):  
Test Bench ◽  
Piston Engine ◽  
Vibration Acceleration ◽  
Mechanical Vibrations ◽  
Drive Unit ◽  
Constant Torque ◽  
University Of Technology ◽  
Diesel Injection ◽  
Diesel Cycle ◽  
Acoustic Evaluation

The paper presents the results of the bench tests to measure mechanical vibrations of a new aircraft opposed piston engine with reciprocating pistons. The PLZ-100 engine is a three-cylinder, six-piston, two-shaft drive unit with a two-stroke diesel cycle. This type of engine is dedicated for powering light aircraft, e.g. autogyros. The tests were carried out on a test bench at the Lublin University of Technology. The engine was loaded with constant torque, for several fixed values of rotational speed of a crankshaft. The angle of the start of diesel injection was changed for each of the rotational speeds. The mechanical vibrations that accompanied the operation of this drive unit were recorded with three measurement transducers and a National Instruments conditioning system. Each of the transducers was mounted on a different axis of the engine. The signals were analyzed from their courses with the DIAdem software. The results were the courses of effective speed and vibration acceleration to conduct a vibration-acoustic evaluation of the PLZ-100, detect and prevent various types of defects or failures.

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