Influence of mechanical ventilation and cooling systems on vibrations of high precision machines

The aim of the research was to describe the effects that air and water cooling systems can have on the dynamic behaviour of precise machines. Although much thought is paid to vibration isolation of the ground and isolation of individual effects of machines operating close to each other, it is often forgotten to model or to measure the effects that the ventilation or the machines cooling systems have on the machine itself. This can be especially important for high precision machines used for experimental research and medical equipment. The article shows the effects of ventilation and cooling system on the induction of additional resonant frequencies of the system for the high precision machine like a linear collider. This kind of machine requires special environmental conditions to assure proper beam stability. Due to the dynamic behaviour of typical machines, the presence of the new high amplitude frequencies in the 0-100 Hz range is very dangerous for its stability of work. In the case of high precision machines, it is not only a cause of not optimal working conditions but very often is a cause of serious problems.

Download Full-text

Active vibration isolation of high precision machines

Diamond Light Source Proceedings ◽

10.1017/s2044820110000134 ◽

2010 ◽

Vol 1 (MEDSI-6) ◽

Cited By ~ 7

Author(s):

C. Collette ◽

S. Janssens ◽

K. Artoos ◽

C. Hauviller

Keyword(s):

Active Control ◽

High Precision ◽

Vibration Isolation ◽

Control Strategies ◽

External Disturbances ◽

Single Degree Of Freedom ◽

Single Degree ◽

Atomic Force ◽

Active Vibration ◽

Precision Machines

This paper provides a review of active control strategies used to isolate high-precisionmachines (e.g. telescopes, particle colliders, interferometers, lithography machines or atomic force microscopes) from external disturbances. The objective of this review is to provide tools to develop the best strategy for a given application. Firstly, the main strategies are presented and compared, using single degree of freedom models. Secondly, the case of huge structures constituted of a large number of elements, like particle colliders or segmented telescopes, is considered.

Download Full-text

Design, Fabrication and Testing of Cooling Systems for a Particle Accelerator

Volume 1: Aerospace Heat Transfer; Computational Heat Transfer; Education; Environmental Heat Transfer; Fire and Combustion Systems; Gas Turbine Heat Transfer; Heat Transfer in Electronic Equipment; Heat Transfer in Energy Systems ◽

10.1115/ht2017-4996 ◽

2017 ◽

Author(s):

John D. Bernardin ◽

Walter C. Barkley ◽

Jack Gioia ◽

Pilar Marroquin

Keyword(s):

Cooling System ◽

Electrical Energy ◽

Temperature Data ◽

Particle Accelerator ◽

Water Cooling ◽

Large Structure ◽

Science Center ◽

Cooling Systems ◽

Water Cooling System ◽

Selection Of

This paper discusses the design, analysis, and testing of a Water Cooling System (WCS) for a Drift Tube Linear (DTL) Particle Accelerator structure at the Los Alamos Neutron Science Center (LANSCE). The DTL WCS removes large amounts of dissipated electrical energy in a very controlled manner to maintain a constant temperature of the large structure. First, the design concept and method of water temperature control is discussed. Second, the layout of the water cooling system, including the selection of plumbing components and instrumentation is presented. Next, the development of a numerical nodal network model, used to size the plumbing, pump, control valves, and mixing tank (heat exchanger), is discussed. Finally, empirical pressure, flow rate, and temperature data from a functioning DTL water cooling system are used to assess the water cooling system performance and validate the numerical model.

Download Full-text

Preliminary experimental of GPU immersion-cooling

E3S Web of Conferences ◽

10.1051/e3sconf/20199303003 ◽

2019 ◽

Vol 93 ◽

pp. 03003 ◽

Cited By ~ 1

Author(s):

Nugroho Agung Pambudi ◽

Husin Bugis ◽

Ilham Wahyu Kuncoro ◽

Nova Dany Setiawan ◽

Miftah Hijriawan ◽

...

Keyword(s):

Cooling System ◽

Dielectric Strength ◽

Water Cooling ◽

Cooling Process ◽

Liquid Cooling ◽

Immersion Method ◽

Cooling Systems ◽

Technology System ◽

Immersion Cooling ◽

High Dielectric

A typical information technology system takes around 40% of the total energy used in cooling the system. There are three major classifications of cooling system and they are: water cooling, close loop liquid cooling, and immersion cooling systems. Immersion cooling has been observed to be the latest trend in cooling systems for IT devices. It is a cooling procedure that is carried out through the immersion of all computer components in a dielectric coolant. This research examined the cooling process of GPU using this immersion method. Mineral oil, because of its high dielectric strength, is used as a medium fluid. The temperature difference between the use of fan and immersion cooling was then measured using a benchmark software. The result showed that the immersion cooling produced a lower GPU temperature compared to the conventional fan. The working temperature of the GPU with the use of immersion method was 70°C while it was 80°C with the conventional fan method.

Download Full-text

Improving the cooling system of ship equipment

MORSKIE INTELLEKTUAL`NYE TEHNOLOGII ◽

10.37220/mit.2020.49.3.015 ◽

2020 ◽

Author(s):

А.В. Фомин ◽

Е.В. Фомин

Keyword(s):

Power Plants ◽

High Efficiency ◽

Cooling System ◽

Heat Removal ◽

Normal Operation ◽

Water Cooling ◽

Cooling Systems ◽

Start Up ◽

Membrane Type ◽

Water Cooling System

В статье представлены результаты исследования эффективности работы системы охлаждения корабельного оборудования и предложены конструктивные решения, позволяющие модернизировать данную систему. В настоящее время, для обеспечения нормальной работы корабельного оборудования, применяются системы охлаждения. В корабельных энергетических установках распространены системы водяного охлаждения из-за целого ряда преимуществ. К ним относится и высокая эффективность теплоотвода, и меньшее влияние внешней среды, а также более надежный пуск и возможность использования энергии отводимого тепла для других нужд. Одним из основных элементов в таких системах является расширительный бак гравитационного типа, обеспечивающий правильную циркуляцию дистиллированной воды во внутреннем контуре и расположенный в верхней точке системы. Однако практика испытаний и эксплуатации показала, что есть и серьезный недостаток в таком расположении бака – в случаи его перелива или разрыва может пострадать дорогостоящее оборудование, расположенное ниже. В связи с этим, определены направления по совершенствованию системы водяного охлаждения корабельного оборудования, которые связаны с применением расширительного бака мембранного типа и использования воздухоудаляющих клапанов. The article presents the results of a study of the efficiency of the cooling system of ship equipment and offers design solutions that allow to modernize this system. Currently, to ensure the normal operation of ship's equipment, cooling systems are used. Water cooling systems are common in ship power plants due to a number of advantages. These include high efficiency of heat removal, less influence of the external environment, as well as more reliable start-up and the ability to use the energy of the heat being withdrawn for other needs. One of the main elements in such systems is a gravity-type expansion tank that ensures proper circulation of distilled water in the internal circuit and is located at the top of the system. However, the practice of testing and operation has shown that there is a serious drawback in this arrangement of the tank – in cases of overflow or rupture, expensive equipment located below may suffer. In this regard, the directions for improving the water cooling system of ship equipment, which are associated with the use of an expansion tank of the membrane type and the use of air-removing valves, have been identified.

Download Full-text

THE ANALYSIS OF BALANCING WATER COOLING SYSTEMS AND MAKING MANAGEMENT DECISIONS REGARDING OFFICE BUILDINGS

Mokslas - Lietuvos ateitis ◽

10.3846/mla.2010.101 ◽

2010 ◽

Vol 2 (5) ◽

pp. 109-114

Author(s):

Andrius Timofejevas ◽

Kęstutis Čiuprinskas

Keyword(s):

Flow System ◽

Cooling System ◽

Electricity Price ◽

Operating Costs ◽

Water Cooling ◽

Constant Flow ◽

Cooling Systems ◽

Public Building ◽

Variable Flow ◽

Control Valves

The paper analyses a cooling system installed using 268 fan coils and having an area of 7900 m2 in a public building situated in Vilnius city. A comparison between a constant flow system having three way valves, a variable flow system having manually balanced valves and a variable flow system having automatically balanced control valves is made. The analysis has been performed to find out initial investments, installation costs and operating costs during 10 year period. Calculation has showed advantages of the variable flow. The overall cost of the system having manually balanced and two way control valves is 20% lower than that of the constant flow system. The overall cost of the system having automatically balanced control valves is 37% lower than that of the constant flow system. The marked differences may increase in case of growth in electricity price.

Download Full-text

Control of mussel Mytilus galloprovincialis Lamarck fouling in water-cooling systems using plasma discharge

Water Science & Technology ◽

10.2166/wst.2019.361 ◽

2019 ◽

Vol 80 (6) ◽

pp. 1125-1133

Author(s):

Hui Ge ◽

Hongcheng Wang ◽

Zhiying Gao

Keyword(s):

Mytilus Galloprovincialis ◽

Cooling System ◽

Low Frequency ◽

Input Energy ◽

Water Cooling ◽

Cooling Systems ◽

Liquid Discharge ◽

Distribution Mode ◽

Water Cooling System ◽

Discharge Center

Abstract To prevent marine macrofouling, the anti-fouling effect of liquid discharge on mussels Mytilus galloprovincialis Lamarck was investigated in a simulated water-cooling system. The effects of input energy, mussel distance from discharge center, continuous discharge time, and discharge energy distribution mode on mussel response (death or detachment) were systematically studied. The results showed that excellent anti-fouling effects could be achieved by increasing input energy, but the detachment rate and mortality of mussels decreased sharply when the mussels were farther away from the discharge center. Low frequency discharge for a long, continuous time and multiple stimuli at long intervals improved the anti-fouling effect. Shock waves are the most likely cause of mussel eradication, and the threshold values of peak pressure to prevent mussel settlement and to cause death were 0.02 MPa and 0.05 MPa, respectively.

Download Full-text

Optimized Design of Diesel Generators Based Chilled Water Cooling System for Intelligent Hospitals and Hotels

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.c8536.019320 ◽

2020 ◽

Vol 9 (3) ◽

pp. 1649-1656

Keyword(s):

Carbon Dioxide ◽

Co2 Emissions ◽

Cooling System ◽

Load Management ◽

Water Cooling ◽

Cooling Systems ◽

Saving Ratio ◽

Chilled Water ◽

Diesel Generators ◽

Water Cooling System

For the intelligent applications like Hotels and Hospitals, there is requirement of efficient chilled water system in terms of energy consumption reduction, cost minimization, reduction in Carbon Dioxide (CO2 ) emissions. As the loads in hotels and applications increases, the performances of water cooling systems becomes the worst that leads to excessive consumption of energy and emission of CO2 , thus it needs the efficient load management strategies as well. In this paper, we first analysed the challenges of energy and CO2 efficiency of water cooling system in the intelligent hospitals and hotels from systematic point of view and then introduced the effective scheduling strategies for both hotel and hospitals. Further, the key focus in this paper is to design water cooling system using the diesel generators by considering the real time applications hospitals and hotels. Since the coolant temperature is having the significant effects on the performance of cooling engine and the CO2 emissions, therefore we introduced the diesel generators with coolant system to investigate such effects. For the cold water supply load management, we designed the Particle Swarm Optimization (PSO) based scheduling strategy at last. This paper exhibits the plan and its simulation results that analysed in terms of ESR (Energy Saving Ratio), CSR (Cost Saving Ratio), and CRR (Carbon dioxide Reduction Ratio) for the Internal Combustion Engine (ICE) capacity on heating and cooling systems.

Download Full-text

Assessment of thermal behavior of a cooling system to reduce thermal fatigue cracks in aluminum injection molds

Revista Liberato ◽

10.31514/rliberato.2020v21n35.p75 ◽

2020 ◽

pp. 75-86

Author(s):

Sergio Antonio Camargo ◽

Lauro Correa Romeiro ◽

Carlos Alberto Mendes Moraes

Keyword(s):

Thermal Fatigue ◽

Cooling System ◽

Fatigue Cracks ◽

Cooling Water ◽

Thermal Conditions ◽

Thermal Gradients ◽

Ansys Software ◽

Cooling Systems ◽

Thermal Fatigue Cracks ◽

Number Of Cycles

The present article aimed to test changes in cooling water temperatures of males, present in aluminum injection molds, to reduce failures due to thermal fatigue. In order to carry out this work, cooling systems were studied, including their geometries, thermal gradients and the expected theoretical durability in relation to fatigue failure. The cooling system tests were developed with the aid of simulations in the ANSYS software and with fatigue calculations, using the method of Goodman. The study of the cooling system included its geometries, flow and temperature of this fluid. The results pointed to a significant increase in fatigue life of the mold component for the thermal conditions that were proposed, with a significant increase in the number of cycles, to happen failures due to thermal fatigue.

Download Full-text

Dynamic characteristics of squeeze-type mount using magnetorheological fluid

Proceedings of the Institution of Mechanical Engineers Part K Journal of Multi-body Dynamics ◽

10.1243/146441905x10005 ◽

2005 ◽

Vol 219 (1) ◽

pp. 27-34 ◽

Cited By ~ 5

Author(s):

Y K Ahn ◽

J-Y Ha ◽

Y-H Kim ◽

B-S Yang ◽

M Ahmadian ◽

...

Keyword(s):

Dynamic Characteristics ◽

Experimental Analysis ◽

Vibration Isolation ◽

Dynamic Behaviour ◽

Electrical Current ◽

Magnetorheological Fluid ◽

Test Set ◽

Mr Fluid ◽

Set Up ◽

Stiffness And Damping

This paper presents an analytical and experimental analysis of the characteristics of a squeeze-type magnetorheological (MR) mount which can be used for various vibration isolation areas. The concept of the squeeze-type mount and details of the design of a squeeze-type MR mount are discussed. These are followed by a detailed description of the test set-up for evaluating the dynamic behaviour of the mount. A series of tests was conducted on the prototype mount built for this study, in order to characterize the changes occurring as a result of changing electrical current to the mount. The results of this study show that increasing electrical current to the mount, which increases the yield stress of the MR fluid, will result in an increase in both stiffness and damping of the mount. The results also show that the mount hysteresis increases with increase in current to the MR fluid, causing changes in stiffness and damping at different input frequencies.

Download Full-text