4 results about "Noise minimization" patented technology

The invention relates to the technical field of automobile air conditioner system design and optimization, in particular to an automobile air conditioner HVAC system multi-target design method based on sensitivity analysis and collaborative optimization. Screening out design variables which are respectively strongly related to the air volume and the aerodynamic noise; kriging approximation models are constructed for the two subjects of air volume and noise respectively, single-target optimization is carried out by adopting a multi-island genetic algorithm, and the optimal solution of each target in a design space is determined; an improved collaborative optimization strategy framework is constructed, a system-level optimization target is set as a weighted normalization function of air volume maximization and noise minimization, a relaxation factor is introduced to relax consistency constraint from an equation to an inequality, and minimization of difference of design variables between a system level and a subject level is taken as a subject-level target. Iterative optimization is carried out, and finally the optimal balance design of the centrifugal fan of the HVAC system is obtained.

A high-intensity focused ultrasound generation device includes an integrated electrode including a ultrasound radiation frame, a transducer holder, and a transducer to allow electromagnetic interference (EMI) noise having focused only on the transducer to flow into the ultrasound radiation frame so as to minimize noise and thus is advantageous in that a signal loss due to the noise is prevented and an RF signal may be more stably applied. Furthermore, the ultrasound radiation frame, the transducer holder, and the transducer are included in the integrated electrode and thus a negative electrode of a power supplier may be connected to a negative electrode of a singular transducer or the ultrasound radiation frame so that a circuit structure may be very simple compared to a structure connected to each of a plurality of transducers.

The present invention relates to a short-axis direction horizontal linear vibration actuator, and more particularly, to a short-axis direction horizontal linear vibration actuator that effectively controls a strong vibration force by concentrating a geomagnetic field, thereby minimizing driving noise. Accordingly, as the market for virtual reality (VR) and augmented reality (AR) expands beyond the mobile phone market, the short-axis direction horizontal linear vibration actuator can be applied to various goods such as car electronics, home appliances, and beauty products.

A method of controlling an electric aircraft that has a plurality of actuators that includes a plurality of electric propulsion units includes: receiving force and moment commands for the electric aircraft; determining control commands for the plurality of actuators based on the desired force and moment commands by solving an optimization problem that comprises a noise minimization term for minimizing noise generated by the electric propulsion units; and controlling the plurality of actuators according to the determined control commands to meet the force and moment commands for the electric aircraft.