Ground work like blasting, piling and excavation has always had a great influence during the planning phase of a construction project since it can cause damages on adjacent buildings and have severe economic consequences. This thesis deals with how Vibrations caused by ground work influence near-by buildings and what methods geotechnicians and construction entrepreneurs use to handle these risks.The purpose of this thesis is to explain risk management in relation to ground work. In order to achieve this I have used a qualitative method by interviewing a geotechnician and a ground work contractor who possess knowledge and experience useful to this thesis. The result shows that Vibrations from ground work spread through the ground as seismic waves that cause displacements and packing in the ground visible in adjacent buildings as cracks and subsidence damages. Geotechnicians study ground work Vibrations by means of ground investigations and experience from previous projects in order to produce a risk analysis that entrepreneurs can use to reduce damages.

This project has revolved around finding better ways of overseeing Vibrations of the gearbox at a wind power station. The gearbox has been a huge problem at the stations located at Gässlingen and the sooner the warning of an incoming breakdown is at hand the more money you can save from preparations. The work has been carried out together with Askalon AB in cooperation with consults from ÅF. Askalon is a company with a department focused on overseeing Vibrations and it is in collaboration with that department the work has been carried out. During this work, new positions for the sensors and new methods of gathering and analyzing data have been worked out. This was then implemented at a wind power station to be tried out on site.

The problems with train-induced Vibrations are increasing with heavier and faster trains. Therefore the work with propagating Vibrations is of outmost importance, and that is what this thesis relates to.To get a sensible idea of the propagation, calculation models are often used. Propagation calculation models takes into account factors such as distance to the railway, the ground material and the velocity and weight of the train. This work is mainly about finding suitable existing models and, if necessary, adjust them to be more useful with modern trains and railways.The report contains the work of adjusting one such model and does, despite the fully functional adjusted model, describe how much more there can be done within this topic. Finally, a few tips about specific areas that preferably should be studied to get even further knowledge about the troublesome problems from railways..

To design new and high tech products the engineers rely more and more on computer based simulations to investigate the properties and behavior for a component or system.To verify these computer based simulations the dynamic properties for the components of the drivetrain needs to be verified. Therefore measurements of the stiffness and Vibrations for the rear axle has been performed. This report show how the measurements has been implemented and evaluated, along with some interesting results for the rear axles properties.The static stiffness for the drive shaft along with the axle-gear has been determined. It is found that the stiffness for the whole rear axle is near the stiffness for the drive shaft, which means that the drive shaft becomes the dominant component of the system and affects the rear axle stiffness the most. The measured stiffness of the driveshaft is close to its theoretical stiffness.The stiffness for solely the hypoid-gear have been calculated using the stiffness for the rear axle and driveshaft, and thus has a range for the stiffness of the hypoid gear been determined.The backlash for the whole rear axle and for some individual components has been determined, where the backlash between pinion and crown-wheel has negligible impact on the total backlash.Measurements of the crown-wheel and pinion movements have been conducted, where the direction of movement is consistent with the theoretical direction of the forces.The vibration measurements show that the Vibrations are more severe at certain rotational speeds.

Active Vibration Control of a Laser PatternGenerator in Microlithography.

Comfort analyses regarding human induced VibrationsIt is not too common among civil engineers in Sweden to perform comfort analyses considering the Vibrations caused by human activities. In addition, the Swedish standards lack requirements to be used for comfort analyses in design of floor-systems. The demand for large spans in combination with slender slabs, is today a reason to investigate the floor-system constructions, in order to prevent disturbing Vibrations and oscillations.The purpose of this thesis is to create a guide for how a comfort analysis, considering Vibrations, should be implemented. Göran Svedenbjörk who is an expert in structural dynamics has been interviewed where he presents his latest project Värtaterminalen and answers some questions about Vibrations due to human activities.Floor-systems, consisting of concrete slabs supported by steel or concrete beams, have been investigated with simulations in the finite element program Abaqus. In the simulations, the influence of various factors on the natural frequency of floor-systems and the acceleration level caused by dynamic loads, is studied.

Abstract 1.The purpose of this study was to investigate the effects whole body Vibrations on maximal strength, power output and neuromuscular activity in m. pectoralis major during bench press.Participants consisted of 35 male and 9 female military high school students (m=23, 1 years). On the basis of initial maximal performances in bench press the participants was divided into two experiments groups and one control group. Intervention groups performed a specifically designed push up program on a vibrating plate respectively a step board during 12 weeks Initial load at 60 % of 1 RM showed an average of 46, 5 kg. All groups showed an average increase of 13 kg for each person after 12 weeks.

Ask any constructional worker and there is a high probability that this person knows a colleague with pain or other disorders caused by working with power tools.According to the Swedish Work Environment Authority 71 percent of the Swedish constructional workers is exposed to Vibrations at least 25 percent of the working hours. Despite this, the number of reported occupational sicknesses caused by Vibrations is as low as 1, 4 percent.JM Ltd. is one of the largest constructional companies in Sweden. Their main business is new housing and development of residential areas. God quality and low impact on the environment is a part of great importance in the company?s long-term goals.

Thermia Värme AB is one of the market leading manufactures of heat pumps. In order tomaintain this position, the company wants to improve the vibration characteristics of theirproducts. The aim of this thesis is to develop product design changes that lead to a reductionof Vibrations in the heat pump Thermia Diplomat 8.The main cause for Vibrations in the system is flow pulsation and mechanical forces inducedby the scroll compressor. Vibration is transmitted through the compressor piping and receivedby the heat exchangers, from where it is further transmitted to the connection points for theradiator and heat source circuits.A number of design changes in order to improve the vibration characteristics have beenevaluated through calculations and practical experiments. The changes have included thecompressor and heat exchanger mountings, the compressor suction and discharge line pipingand also pulsation dampening.The results of the experiments show that the vibration levels in the connections for the heatingand brine circuits can be decreased strikingly through changes in suction and discharge linepiping.

The goal of this project was to together with Cochlear Bone Anchored Solutions AB develop a new cleaning tool for their Baha?systems. Cochlear BAS AB is a daughter company to Cochlear Limited based in Sydney, Australia. Cochlear BAS AB is situated in Gothenburg and with its 150 employees develop and manufacture the Baha?system.

This project is about the development of a application to aid deafblind people with time understanding. The application is written in C# language and have multiple functions to alarm the user. The application can alarm deafblind persons through a combination of sounds, pictures and Vibrations. This makes the application very flexible and can be used by many different groups like deaf, blind and older people. This application have been evaluated by staff from Mo Gård resurscenter..

SAMMANFATTNINGBakgrundEn del av företagssköterskans arbetsuppgifter är att arbeta förebyggande och se olika typer av problematik som finns hos arbetstagare och arbetsgivare. Omvårdnad av människan ska stå i fokus och rikta sig mot arbetslivet där en säker och god omvårdnad ges (SOU 2011:63). Vibrationsexponering av händer och åtföljande effekter utgör ett betydande arbetsmedicinskt problem där kyrkvaktmästare utgör en exponerad yrkesgrupp.SyfteSyftet med studien var att kartlägga besvär i händer och armar hos kyrkvaktmästare och deras kunskaper kring riskerna med Vibrationsexponering.Metod 50 kyrkvaktmästare besvarande två enkäter, en om symtom och en om arbetsmiljö vid Vibrationsexponering av handhållna verktyg och dess risker och skador. Resultatet presenterades som deskriptiva data.Resultat Köldkänsla 40 %, vita fingrar 38 % och kramp 38 % var de vanligaste symtomen. Symtom var vanligare bland dem som arbetat minst 10 år i Vibrations exponerade arbete.De hade lite kunskap om riskerna med arbetet.

Concrete floors have traditionally had no problems with annoying Vibrations. However with the demand for larger spans the floors need to be made more slender with a higher degree of utilization and lower mass. Therefore new floors may have problems with vibration serviceability. This thesis studies the vibration characteristics of hollow core slabs. The analysis was made in the finite element program Ansys. The hollow core slab was subjected to a varying force simulating one person walking across the slab.

Autoliv Electronics AB utvecklar, tillverkar och säljer produkter till fordonsindustrin. När en produkt utvecklas utförs en rad olika miljötålighetstester. Dessa miljötålighetstester skall simulera alla miljöfaktorer som produkten stöter på under sin livscykel. Miljöfaktorerna som testas är mekaniska, kemiska, elektriska och termiska.De mekaniska miljöfaktorerna innefattar vibrationer, stötar, fall och slag. När vibration och stöttest utförs används en vibrator.

The Secret Fashion Council blends spirituality with fashion, art and design. This jewellery collection shows the connections between parapsychology and quantum physics, based on the study of matter and energy, that everything in the universe is built of Vibrations. Many believe psychics have the ability to sense this. By using the skills of a psychic, the Secret Fashion Council invites the wearer to have the jewellery ?read? and evaluated in a most special way, tracing the wearer?s spiritual past, present and future.