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A method is described which can be used to calculate dynamic gear tooth force and bearing forces. The model includes elastic bearings. The gear mesh stiffness and the path of contact are determined using the deformations of the gears and the bearings. This gives contact outside the plane-of-action and a time-varying working pressure angle. In a numerical example it is found that the only important

A method to determine the dynamic load between two rotating elastic helical gears is presented. The stiffness of the gear teeth is calculated using the finite element method and includes the contribution from the elliptic distributed tooth load. To make sure that the new incoming contacts which are the main excitation source are properly simulated, the necessary deformation of the gears is determi

In a structural modification problem the mass and stiffness matrices are modified to obtain a desired spectrum. In this paper, this is done by imposing constraints on the structure. The undamped natural vibrations of a constrained linear structure are calculated by solving a generalized eigenvalue problem derived from the equations of motion for the constrained system involving Lagrangian multipli

Popular Abstract in English Among the large variety of experiments performed in science, a common one is to pass a light beam through a sample, the object to be studied, and to study the outcomes of the light-sample interaction. Many light sources have been used for this purpose, like light bulbs and lasers. A modern light source used nowadays is the so-called storage ring. In the storage rings elSynchrotron radiation sources have greatly contributed to the progress in many fields of science. The development of the storage ring technologies has made possible to obtain very low emittance electron beams, which together with the use of undulators allow guiding a very high photon flux into a very small spot required by the experiments. Development of the sources has been accompanied with equa

A boundary integral equation is described for the prediction of acoustic propagation from a monofrequency coherent line source in a cutting with impedance boundary conditions onto surrounding flat impedance ground. The problem is stated as a boundary value problem for the Helmholtz equation and is subsequently reformulated as a system of boundary integral equations via Green's theorem. It is shown

Scattering from an acoustically soft elliptic disk is treated by means of the null field approach. It is shown that in the disk limit of a general ellipsoid the relevant matrix elements have a well-defined limit, and that the formulation is attractive for numerical calculations. In a separate section the low frequency expressions of the total cross section and the far field amplitude are also deri

Within recent years, there has been a renewed focus on sound in urban environments. From sound installations in public space to sound festivals in alternative settings, we find a common interest in sound art relating to the urban environment. Artworks or interventions presented in such contexts share the characteristics of site specificity. However, this article will consider the artwork in a broa

How does the child experience sound environment? 2017-03-17 genomförde Ljudmiljöcentrum det tvärvetenskapliga symposiet "Child & Noise - How does the child experience sound environment?" International interdisciplinary symposium aimed at shedding light on how the sound environment may affect the child, spanning from the prenatal stage to the young person enjoying loud music. We too seldom ask how

https://www.lmc.lu.se/aktiviteter/aktiviteter-2017/child-noise - 2026-06-05

Several room acoustic parameters have to be considered in ordinary public rooms, such as offices and classrooms, in order to present the actual conditions, thus increasing demands on the acoustic treatment. The most common acoustical treatment in ordinary rooms is a suspended absorbent ceiling. Due to the non-uniform distribution of the absorbent material, the classical diffuse field assumption is

https://www.lmc.lu.se/aktiviteter/aktiviteter-2022/ljudmiljocentrum-pa-bokmassan-i-goteborg-2022 - 2026-06-05

Universitetslektor i fri konst Kontaktinformation E-post: youngjae [dot] lih [at] khm [dot] lu [dot] se Mobil: +46 76 575 77 95Organisation Konsthögskolan i Malmö WebbplatsYoungjae Lihs profil i Lunds universitets forskningsportalYoungjae Lih är lektor Publikationer Visar av publikationer. Sorterade efter år och sen titel. Filtrera efter typ AllaBokDel av eller Kapitel i bokKonstnärligt arbeteÖvri

https://www.khm.lu.se/youngjae-lih - 2026-06-06

The transmission of vibrations over the surface of the ground, due to a high-speed moving, vertical harmonic strip load, is investigated theoretically. Consequently, the problem is essentially two-dimensional and the interior of the ground is modelled as an elastic half-space. The transformed solutions are obtained using the Fourier transform on the space variable. A study of a new damping model i

Audio Paper offers a conceptual and practice-based approach for researchers across a wide range of disciplines to integrate auditory culture into their published work in the form of the audio paper.The audio paper is an academic text presented as an audio production. Introducing this new format, the book invites scholars to work in a publication format that integrates aesthetic perspectives and te

https://www.lmc.lu.se/aktiviteter/aktiviteter-2020/underwater-sounds - 2026-06-05

This paper considers elastic wave propagation and vibration transmission in lightweight composite structures. Specifically a spectral finite element method (SFEM) is developed as an effective numerical tool for the analysis of wave motion in uniform laminated elastic media. In short, SFEM combines a standard finite element method in the direction of layering together with analytical solutions for