<div class="section abstract"><div class="htmlview paragraph">Along with the increasing importance of battery electric vehicles for the automotive industry, new challenges have emerged in the development process of the acoustic behavior of the electric powertrain. One concern arises from the high-frequency whining noise, either caused by the electric field of the motor or by the gearbox. Noise is transmitted via two different paths, the structure-borne path and the airborne path. The focus here is on the latter one, which describes the radiated sound from the surface of the motor housing and the transmission through the car body to the driver’s ear.</div><div class="htmlview paragraph">One possibility for reducing the effect of this acoustic radiation is the application of passive acoustic noise control treatments. This is typically done either by attaching secondary treatments on the vehicle-body side or by encapsulating the motor directly. Depending on the applied material concept, the motor-mounted encapsulation approach isolates the motor and/or adds absorption to the engine bay.</div><div class="htmlview paragraph">To implement a process for the prediction of the acoustic isolation effect of encapsulation in the early design stage, an investigation has been undertaken where different material concepts are applied to a generic motor housing (GMH). The isolation performance of these encapsulation concepts is evaluated by exciting the housing with an electrodynamic shaker and measuring the radiated sound power. First, the investigation is performed experimentally; afterward, corresponding simulations are validated by test results. Various conclusions can be drawn from this study for certain aspects of the process and the simulation model.</div></div>

Some improvements of biomagnetic apparatus and measuring procedures have been made such as 2-channel SQUID-magnetometer with changeable base, optimization of antenna, and minimization of power-line disturbances. The future of developed approaches for increasing noise-immunity of devices at unshielded environment have been demonstrated. Experiments in scheme of passive and active location for studying magnetic nanoparticles injected into lab animals have been provided.

In the design of lightweight structures, both the dynamics and durability must be taken into account. In this paper, a methodology for the combined optimization of structural dynamics, lightweight design, and lifetime with discrete vibration engineering measures is developed and discussed using a demonstration structure. A two-sided welded bending beam is excited at the centre and optimal parameters for tuned mass dampers (TMD) are searched, satisfying the requirements for the dynamic behaviour, the overall mass, and the lifetime of the weldings. It is shown that the combination of a reduced order model with the implementation of the structural stress approach at critical welds enables an efficient evaluation of certain design concepts in the time domain. Using this approach, multi-criterial optimization methods are used to identify the best set of parameters of the TMD to reduce the structural vibrations and enhance the durability.