Design Of Test Bench Research Articles

Design of a fatigue test bench in rotary flexion to evaluate the behavior to cyclical loads

The development of this article shows the process of design, construction and start-up of a fatigue machine in rotary flexion. Fatigue is a subject of considerable relevance and requires adequate equipment for its study, therefore it is sought to contribute to educational and research growth through the development of a functional fatigue machine and where a variety of materials can be studied. The main results were the development of a machine that can carry out a totally inverted stress of 977 Mpa, therefore it can arrive to study steels of high resistance. This machine follows the standards of the normative ASTM E-466 regarding the dimensions of the test specimen. The design of the machine is divided into 3 systems, mechanical system, electrical system and electronic system. When joining these systems obtained a functional and autonomous machine where can make serious and reliable investigations.

Design and evaluation of a research-educational test bench applied to rotor dynamics studies

The rotor dynamics study is critical in the design of rotating machinery. The dynamic modeling of rotors aims to estimate the operating condition of rotating machinery through the evaluation of parameters related to the critical velocity and responses to unbalance. The application of small-scale test bench and the development of dedicated experimental procedures are important for the grounding of complex rotating high power machines behavior phenomena. The experimental evaluation is an important validation of theoretical models, such as those obtained by analytical and numerical models. This work aims the description of an experimental test bench, and later were the object of study to be modeled in several conditions: using analytical, numerical and experimental methods. In the end, with all these results, there is a comparative assessment of the modeling and validation of equipment.

Evaluation of Low-Power Instrument Transformers for Generator Differential Protection

In hydroelectric power plants, which are characterized by particularly high short-circuit current levels and high time constants, conventional current transformer specifications can result in increased equipment dimensions, thus complicating their installation, especially during refurbishment projects. This paper presents a study to assess the potential of various low-power instrument transformers (LPITs) for generator protection applications. Two types of LPITs were evaluated: the optical current transformer (OCT) and the stand alone merging unit (SAMU). To test the OCT, a 65-kA-peak test source was developed using a real-time simulator. This source was used to inject symmetrical and asymmetrical currents into LPITs for the assessment of protection accuracy class. Low-current tests were also performed to assess their metering classes. This paper presents the design of a high-current test bench, measurement uncertainty analysis, and analysis algorithms used for device evaluation. Analysis results are then presented and discussed in terms of their applicability to generator differential protection using SAMUs and OCTs.

ESS Personnel Safety Systems Test Stand

Providing and assuring safe conditions for personnel is a key parameter required to operate the European Spallation Source (ESS). The Personnel Safety System (PSS) primarily prevent workers from the facility’s ionising radiation hazards, but also identify as well as mitigate against all other hazards such as high voltage and oxygen depletion. The PSS test stand is being developed in the ESS Protection Systems (PS) lab. It will be used for simulation, testing and verification purposes of any system, equipment, function and procedure developed by the PSS team. At the later stage of the project it will facilitate preparation for operation, maintenance and periodical testing of PSS, and hence it should be as similar as possible to real system. This paper describes the ESS Personnel safety systems’ test bench design, devices, and implemented functions.

Energy Efficiency Labelling System for Industrial Motors

This paper presents an energy efficiency labelling system for industrial motors used in Sri Lanka. Industrial sector in Sri Lanka consumes 3,880 GWh of electricity, i.e. 33% out of 11,741 GWh of total electricity consumption (2015). Induction motors account for a high share of energy used in industry. The energy efficiency labelling system proposed will enable improved efficiency of industrial motors by reducing energy losses. The automatic efficiency testing program is developed using the LabView development platform based on IEC 60034-2-1 standard. Subsequently, a test bench design was also developed. It will be helpful in purchasing motors from the international market and thereby motor driven systems will achieve the next level of efficiency in the industrial sector. It also helps to cross check the efficiency level of repaired or rewound motors. An economic calculation model (tariff based) is developed to analyse the economic benefits of higher efficiency levels. This economic calculation model assists in decision-making of replacement of a motor or an upgrade of a system.

Design of a comprehensive test bench for hydrostatic transmission

Design of a comprehensive test bench for hydrostatic transmission

Improving the efficiency of the roller screen with circular disks

The design, operation and technical characteristics of the roller screen test bench with movable aprons are described. The results of studies of gravel screening on a roller device with circular disks are presented. The rational parameters of the roller screen plate are obtained: the speed of the rollers with disks, working surface canting angle, the speed of the aprons. Comparative evaluation of the efficiency and productivity of the screening process at the devices with circular and multisided disks is given.

Design and fabrication of powder bed test bench and analysis of powder behavior by recoating

Design and fabrication of powder bed test bench and analysis of powder behavior by recoating

BANCO DE ENSAYO PARA VALIDAR EL MODELO COMPUTACIONAL DE UN CUARTO DE COCHE CON AMORTIGUADOR RECUPERADOR DE ENERGÍA

The validation of computer models through experiments is essential and is the basis for the credibility of the results obtained from simulations. This paper presents a flexible, low-cost test bench design and a computer model of a quarter car system fitted with a regenerative energy suspension called BS-EHSA (Ball-Screw Energy Harvesting Shock Absorber). A good correlation between experimental results and simulations is obtained. Based on this validated model, a study of the influence of the different BS-EHSA design parameters is carried out in order to obtain optimal values for ride comfort, road handling, energy recovery and energy efficiency. An average power of 15.13 W is attained when the vehicle is driven at 70 Km/h on a road profile ISO 8608 standard class C roughness index. Key Words: Energy Harvesting Shock Absorber, Suspension, EHSA, Damper, Vehicle.

Preliminary validation of a dynamic electrochemical biodegradation test bench in pseudo-physiological conditions

There is a growing interest in the development of next-generation stent materials. In vitro tests that accurately predict in vivo conditions are desired. In this manuscript, a novel approach for the design of a dynamic electrochemical test bench is evaluated for potential characterisation of biodegradable metallic stent materials. The designed dynamic test bench allows for real-time corrosion testing with easy variation of temperature, shear stress and simulated body fluids (SBF), with minimal complications of test sample fabrication. Preliminary tests have shown Tafel generation is feasible and stable. Effect of SBF, shear stress and temperature were evaluated. Variances in the dynamic test bench were higher with the incorporation of temperature and shear stress, with no notable difference between SBF. This dynamic test bench showed to be relatively stable under temperature and SBF modification; however, further optimisation is needed to decrease variances seen throughout fluid velocity analysis.

Design and development of a PV-T test bench based on Arduino

In this work, the development of a test bench for a thermal photovoltaic panel (PV-T) is presented. A PV-T panel has been designed and it is necessary to develop a test bench to obtain experimental data for thermal and electrical modelling. Data acquisition of the different sensors and actuators on the test bench is done using a self-developed Open Source system based on Arduino platform. The system is implemented in the town of Marín, province of Pontevedra (Spain). In this paper the parameters to be controlled, and the instrumentation chosen, as well as the operation of the Arduino based system, are explained. Finally, a sample of the obtained experimental results is presented.

Accelerated lifetime tests on e-textiles: Design and fabrication of multifunctional test bench

The development of e-textiles and conductive fabrics is strongly supported by the rapid growth of wearable electronics. Unfortunately, the fast development of production technologies for smart textiles has not been followed by standard design methods and validation procedures to certificate the electro-mechanical reliability of e-textiles. Then, the design of test procedures able to control the sources of failure in combination with cross-talk effects (e.g. between load and wear, cyclic loads and current flow, etc.) is crucial. Standard tests already used for traditional fabrics are not satisfactory in predicting the lifetime of e-textiles. This paper introduces the design of innovative machine to assess the performances and reliability of smart fabrics under fully controllable conditions.

Design of Quarter Car Test Bench to Measure Forces on the Tire Contact Path

Suspension system that located between vehicle body and wheels are designed to absorb shock from road surface. The dynamic behavior of the suspension and tire is depends on many factors. Some of the main factors are the vehicle load, speed, steering angle and the magnitude of the elasticity of the tire. The position of the tire-road contact is also always changed when the vehicle running make it difficult to observe the dynamic response of tires. To overcome this problem, in this paper, an in-door test-rig model is designed and evaluated experimentally. This study was conducted by five methods, namely; design, simulation, production, and experimentally test. The dynamic response evaluated includes geometric change of tires and the change of camber angle. The model build consist of framework components, the sprung mass as a representation of aquarter car body and un-sprung mass which are components of the suspension system, wheels and tires. The results show that the proposed design construction is not only saved to handle all forces and moments but alsocan fulfilled functions to simulate the dynamic response of ¼ car model.

Design of Feed-forward Controller with Stick-slip Friction Modeling in Electro-mechanical Brake System

Electro-Mechanical Brake ( EMB ) is expected to be one of the future brake system. Feedback controller with sensor measuring is commonly used for control of EMB. However, this controller has some issues like delayed response and extra cost about sensor installation. In this paper, Feed-forward controller in EMB is proposed for solving these problems of feedback control. Also, it is very necessary to describe dynamical phenomenon of friction in actual EMB system. The actual EMB system shows stick-slip friction of mechanical parts which is difficult to model and apply to design of controller. This research is focused on exquisitely describing this stick-slip friction. In order to do this, the experiment about EMB is proceeded in the open loop system with the motor current command and data from the experiment is used for identification of model parameters during stiction. Then, parameters during slip is estimated in the closed loop system. Finally, developed friction model of EMB is proposed and it is utilized for design of feed-forward controller. Matlab Simulink is used for design of EMB simulation model and EMB test bench is utilized for experiment. Performance of proposed control system is compared with that of feedback control system.

A Comprehensive Study on Fuel Injector Test Bench for Heavy Duty Engine

Abstract This study discusses a fuel injector test bench containing a mechanical type fuel supply system for heavy duty dieselengine. The main focus of this study was to evaluate the design stability of the test bench, which basically measures theinjector durability of a multi-hole heavy duty injector by using pure diesel as a test fuel. In this experiment, diesel spraywas controlled by a specially designed control box and all the experiments were carried out to measure e.g. fuel injectionpressure and fuel injection quantity to understand the injection status which is interlinked with the stability factor of totaltest bench design. Also, the durability test was performed to understand the heavy duty operation lastingness of thedesigned system and the flow rate of the installed distributor pump in the fuel supply system of this studying test benchwas compared with LO-1 and LO-2 pump. The results of the above mention tests revealed that the injector test benchdesign and control system can serve the purpose for heavy duty injector.

Automatic Single Event Effects Sensitivity Analysis of a 13-Bit Successive Approximation ADC

This paper presents Analog Fault Tolerant University of Seville Debugging System (AFTU), a tool to evaluate the Single-Event Effect (SEE) sensitivity of analog/mixed signal microelectronic circuits at transistor level. As analog cells can behave in an unpredictable way when critical areas interact with the particle hitting, there is a need for designers to have a software tool that allows an automatic and exhaustive analysis of Single-Event Effects influence. AFTU takes the test-bench SPECTRE design, emulates radiation conditions and automatically evaluates vulnerabilities using user-defined heuristics. To illustrate the utility of the tool, the SEE sensitivity of a 13-bits Successive Approximation Analog-to-Digital Converter (ADC) has been analysed. This circuit was selected not only because it was designed for space applications, but also due to the fact that a manual SEE sensitivity analysis would be too time-consuming. After a user-defined test campaign, it was detected that some voltage transients were propagated to a node where a parasitic diode was activated, affecting the offset cancelation, and therefore the whole resolution of the ADC. A simple modification of the scheme solved the problem, as it was verified with another automatic SEE sensitivity analysis.

A Review on Thermal Energy Storage Unit for Solar Thermal Power Plant Application

In the present scenario of a huge energy demand, dependency on fossil fuels only, certainly creates crisis in future especially for developing country. Although renewable resources of energy like solar energy is being utilized on a broad scale now a days but the problem comes in law and economy i.e. social and acceptability. Main reasons of this kind of difficulties are low density of solar radiation on earth's surface and if it is available then fluctuating in nature with time of the day and the day of the year. To remove these kinds of difficulties solar energy storage unit must be introduced in solar thermal power application. In this paper, literatures on thermal energy storage unit with phase change material has been rigorously studied to select the best suitable PCMs and materials for the design of test bench of the thermal energy storage unit.

Design of the 15 GHz BPM test bench for the CLIC test facility to perform precise stretched-wire RF measurements

The Compact Linear Collider (CLIC) requires a low emittance beam transport and preservation, thus a precise control of the beam orbit along up to 50 km of the accelerator components in the sub-μm regime is required. Within the PACMAN (Particle Accelerator Components Metrology and Alignment to the Nanometer Scale) PhD training action a study with the objective of pre-aligning the electrical centre of a 15 GHz cavity beam position monitor (BPM) to the magnetic centre of the main beam quadrupole is initiated. Of particular importance is the design of a specific test bench to study the stretched-wire setup for the CLIC Test Facility (CTF3) BPM, focusing on the aspects of microwave signal excitation, transmission and impedance-matching, as well as the mechanical setup and reproducibility of the measurement method.

Design and implementation of a low cost test bench to assess the reliability of FPGA

One of the challenges of Very Large Scale Integration (VLSI) technology is the high cost of reliability characterization of digital integrated circuit. Benefits from the latest downscaling technology and the exibility of the Field Programmable Gate Array (FPGA) architecture, allow developing a new low cost test bench to assess reliability depending on the operation condition. This work explains how we developed a low cost test bench which can be implemented on up to 32 FPGAs and monitored in real time by a supervisory software. We carried out different stress type tests of Look-up tables (LUTs) on modern FPGA devices and obtained a useful characterization of the LUT aging processes.

Modelling of linear test bench for short distance measurements

To perform the calibration of total stations under laboratory conditions, lack of space is a common issue. The paper presents the analysis of applied solutions for short distance measurements and assumptions of the construction development of a linear test bench for cyclic error determination. Various aspects of improvement are explained in the paper and the preliminary design of a linear test bench being developed at Vilnius Gediminas Technical University is presented.