Publications by Lennart Rubbert

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Classical mechanical watch plain bearing pivots have frictional losses limiting the quality factor of the hairspring-balance wheel oscillator. Replacement by flexure pivots leads to a drastic reduction in friction and an order of magnitude increase in qual ...

In previous work, we showed that two degree of freedom oscillators can be advantageously applied to horological time bases since they can be used to eliminate the escapement mechanism. We subsequently examined planar two degree of freedom oscillators based ...

Compliant mechanisms are of great interest in precision engineering. In this paper we propose a higher order continuation method to help their rigid-body kinematic design. The method helps to investigate the choice of a mechanism configuration through the ...

Manipulation at the sub-micron scale often requires force-sensing capabilities of milli-to nanonewton forces. This article presents a novel design of a compliant load cell with mechanically adjustable stiffness. The system enables adapting force sensitivit ...

We define isotropic springs to be central springs having the same restoring force in all directions. In previous work, we showed that isotropic springs can be advantageously applied to horological time bases since they can be used to eliminate the escapeme ...

The mechanical isotropic harmonic oscillator comprises at least a two degree of freedom linkage supporting an orbiting mass with respect to a fixed base with springs having isotropic and linear restoring force properties. The oscillator may be used in a ti ...

The mechanical isotropic harmonic oscillator comprises at least a two degrees of freedom linkage supporting an orbiting mass with respect to a fixed base with springs having isotropic and linear restoring force properties wherein the mass has a tilting mot ...

A mechanical isotropic harmonic oscillator including a frame, a mass configured to oscillate, and three flexure rods, each flexure rod connecting the mass to the frame. ...

Lennart Rubbert

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Gravity-Insensitive Flexure Pivot Oscillators

Theory and design of spherical oscillator mechanisms

Higher-order continuation method for the rigid-body kinematic design of compliant mechanisms

Design of a compliant load cell with adjustable stiffness

Isotropic springs based on parallel flexure stages

Xy isotropic harmonic oscillator and associated time base without escapement or with simplified escapement

General 2 degree of freedom isotropic harmonic oscillator and associated time base without escapement or with simplified escapement

General 2 degree of freedom isotropic harmonic oscillator and associated time base without escapement or with simplified escapement