Structural Dynamics
Dynamic design of engineering structures under natural, human or machine-induced dynamic alternating loads. Investigation, computational analysis and root cause analysis of structural dynamics problems and vibration phenomena of all kinds, including earthquake safety.
Dynamic loads, design criteria
Structures are exposed to a wide range of dynamic influences—such as traffic, machinery, wind, or seismic events. Key aspects of structural dynamics analysis include determining natural frequencies and mode shapes, avoiding resonance, and limiting vibration speeds and accelerations. Depending on the application, design considerations include human perception of vibrations, the vibration sensitivity of machinery and equipment, or safety-related aspects of structural systems.
Analysis, Design
Our services include both the design of new structures and the assessment and optimization of existing ones. In doing so, we take into account not only standards and guidelines but also, and in particular, project-specific requirements. Our work includes numerical simulations, dynamic and frequency-dependent calculations, vibration predictions, and the performance of vibration measurements.
Prognosis, measurements
As early as the planning phase, we prepare well-founded vibration forecasts to identify potential conflicts of use at an early stage. In addition, we conduct targeted vibration and shock measurements on existing structures and facilities using our extensive range of measuring equipment. These measurements serve to calibrate and verify calculations, preserve evidence, or assess environmental impacts and their effects on people, machinery, and structures.
Optimization, retrofitting
If unacceptable vibrations are detected in existing buildings (e.g., due to changes in use), we develop targeted measures to reduce them. These include structural modifications, localized reinforcements, structural natural frequency tuning, and/or the use of damping and decoupling systems. For renovations or changes in use, we assess how existing structures can be adapted to new requirements with minimal intervention.
Vibration control / Decoupling
A key component of structural dynamics is targeted vibration isolation. A distinction is made between source isolation (reducing vibrations generated by a system) and receiver isolation (protecting sensitive areas or equipment). Depending on the requirements, tailored mountings, damping systems, or structural separations are used.
Expert services
As practice-oriented specialists with many years of experience, we support building owners, designers, engineers, and machinery manufacturers in all matters related to structural dynamics. The independent assessment provided by our experts brings clarity to complex issues. Our reports are based on our own measurements and/or calculations and are professionally evaluated thanks to our extensive experience and up-to-date technical expertise. In some cases, we specifically focus only on analyzing time-dependent effects—as support for the civil engineer—and “translate” dynamic and impulse loads into standard parameters.
Earthquake Specialists
Thanks to intensive research and extensive experience, suitable tools for seismic design are now available. Consultation during the design phase is of paramount importance: a professional structural and conceptual development of the load-bearing structure is essential. An assessment of seismic safety (visual inspection, verification calculations, measurement of relevant structural and soil parameters, etc.), as well as the selection of a retrofitting strategy tailored to the specific situation, are often influenced by highly restrictive technical and economic constraints. Detailed analyses help identify weaknesses and develop practical solutions.
Measuring Instruments
References
Turbine Test Cell 2, SR Technics
Airport Zurich, Switzerland
Reactivation of a Turbine Engine Test Cell
Design of the test cell, vibration control measures
Eawag FLUX
Dübendorf, Switzerland
New laboratory building
Structural dynamics design
Research Platform Human Movement
GLC, ETH, Zürich
Decoupling and strengthening of the platform
Expert assessment, supervision