Michael Sturm

• PhD
• Engineer at Robert Bosch Automotive Steering LLC & University of Salford

In noise and vibration engineering, a structure’s passive dynamic properties are often quantified by frequency response functions (FRFs). This paper focuses on acquiring FRFs from experimental tests, considering both, translational (x, y, z) and rotational (e.g. moments around these axes) terms. In practical applications, test structures may not al...

Transfer Path Analysis (TPA) is a test-based methodology used to analyse the propagation of noise and vibration in complex systems. In this paper we present a covariance based framework for the propagation of experimental uncertainty in classical, blocked force, and component-based TPA procedures. The presence of both complex and correlated uncerta...

A major challenge in automotive NVH engineering is to approach complex structure-borne sound and vibration problems with sufficient accuracy but reasonable experimental effort. Typical issues encountered are poor correlation between objective component performance criteria tested for during bench validation and corresponding subjective targets eval...

Transfer path analysis (TPA) is an established and valuable tool in automotive industry to determine the contributions of structure-borne and airborne sound sources to receiver responses at target positions. The classical TPA approach is based on contact forces at the interface between source and receiver to characterise the dynamic loads induced b...

A detailed case study on using in-situ blocked forces for advanced NVH development of automotive structure-borne sound sources is presented. The discussed approach provides a realistic auralization of a steering system virtually operated in a vehicle using in-situ blocked forces from a bench with vehicle transfer paths allowing reliable subjective...

The in-situ blocked force method is a valuable tool to characterise dynamic loads induced by a vibrational source into a passive receiver independent from the characteristics of the receiver. For the success of the method it is crucial to determine frequency response functions (FRF) between degrees of freedom (DOF) at the contact interface and resp...

Vibro-acoustic source characterization is a substantial task in the development of robust products for the automotive industry. Ideally, such characterization should be receiver-independent so that intrinsic information of the source can be acquired from experimental tests on component test rigs without the need to conduct vehicle measurements. The...

The vibro-acoustic behavior of systems and components in modern vehicles play an increasingly important role in the development process of high quality products in automotive industry. In order to characterize the numerous mechanical, electrical and mechatronic systems, many of which embody significant sources of structure-borne sound and vibration...

An adaptive time domain algorithm is derived being capable of recursively reconstructing simultaneous multi-channel force signatures for structures with multi degree of freedom exci-tation, given the structure's impulse response functions and operational response time histories. It is shown that the method facilitates robust calculation of time dom...

Identi�cation of dynamic forces acting on technical structures is a critical aspect of structure-borne sound and vibration problems. Many situations require indirect methods since either the excitation location is not accessible for direct force measurements or the interfacial conditions, on which the actual forces depend, may change due to instrum...

Identification of dynamic forces acting on technical structures is a critical aspect to structure-borne sound and vibration problems. Many situations require indirect methods since either the excitation location is not accessible for direct force measurements or the interfacial conditions, on which the actual forces depend, may change due to instru...