Translation of "Sound flow" in German

Twelvth, the sound attenuator box is actually suitable for practically all tasks of sound attenuation in flow channels.

Adjustment values, pressure drop, sound and flow data – all is there for you to analyse.

In order to reduce sound conductance in flow ducts, for example, in intake and exhaust ducts, ventilating ducts in automotive vehicles in air conditioners, etc., a sound-insulated flow duct is proposed according to this invention which is characterized in that the walls are made up of a composite of an elastic thermoplastic, primarily closed-cell foam material as the outer layer or ply and an open-cell, elastic soft foam material as the inner layer or ply.

Sound-insulated flow ducts of any desired shape can be produced in accordance with the requirements by using the inventive process and construction of a composite material.

The sound-insulated flow duct, according to this invention, does not require any additional external wrappings, but rather represents a very lightweight component which can be connected without problems.

The method of acoustical leakage monitoring under consideration herein is based on the fact that liquids, vapors or gases produce structure-borne sound as they flow out of a leak and in case of vapors or gases expand.

In that respect, the height of the sound inlet is particularly desirably smaller than its length, in which case the sound flow takes place along the longitudinal direction of the sound inlet and the length of the sound inlet is in turn smaller than the width thereof.

The method of acoustical leakage monitoring under consideration herein is based on the fact that liquids, vapors or gases produce structure-borne sound as they flow out of a leak and in case of vapors and gases expand.

A device that measures a physical, chemical or electrochemical quantity (e.g., temperature, pressure, light, sound, motion, flow rate, or pH) and turns it into a electrical signal.

There is still this symbiotic expressiveness, in which composed, improvised and parts freely associated from pure sound organically flow into each other.

Each headphone or even speakers uses resistive parts in the design to dampen the sound flow pneumatically.

Very different in their artistic approach, on their vision of sound, intonation, or flow of musical time, the virtuoso soloists fused into a superb ensemble, delighted in passing the sublime Schubert themes to each other, every time painting them with new colors and emotions.

The invention is thus based on the consideration that the sound-related alternating flow in the gas current is especially well damped when a branch closed at its end is directed into the main stream of flowing gas in such a way that the gas current impinges frontally on the branch.

In this arrangement part of the sound-related alternating flow can enter through the openings in the region of the branch closed off by the cover element.

Experiments with the silencer constructed in accordance with the invention have shown that the sound-related alternating flow of the gas current is decidedly reduced not only in the silencer and/or on the downstream side of the silencer, but that this reduction of the sound-related alternating flow also applies upstream of the silencer, as far as the compressor.

The fact that the silencer also has a pronounced action in the reverse direction, i.e., on the sound-related alternating flow in the outlet of the compressor or the vacuum pump itself, can be explained as follows.

The gas current flowing into the silencer 11 through the entrance 12 impinges frontally on the branch 17, which causes an effective damping of the sound-related alternating flow.

The constriction 27 defined by the annular gap 53, brings about a stepwise impedance change for the gas current on which sound-related alternating flow impinges.

Thus part of the effectiveness of the described silencer may not be ascribable only to the described mechanisms of operation, but also to breakdown of the sound-related alternating flow, i.e., the superimposed pressure-pulsation component, by a perforated plate with a very effective dissipative action, while before reaching the perforated plate the main current is diverted away from the direction in which the pulsation propagates, and nevertheless undergoes only a slight loss of pressure, because the main current does not flow through the perforated plate.

As a result of sound propagation at the speed of sound plus the flow speed, caused for physical reasons, embodiments of the invention are also able to detect downstream the occurring flow parameters for damage analysis and for identifying the damage to blades.

At least two of the following measuring quantities are detected for example as physical measuring quantities: thermal conductivity, heat capacity, thermal diffusivity, density, flow velocity, mass flow, sound velocity, dielectric constant, viscosity, infrared absorption, pressure and temperature, wherein this list is not exhaustive.

The measuring apparatus for determining specific quantities for the gas quality or energy consumption according to the present invention comprises an evaluation unit which is set up for carrying out a method according to one of the aforementioned embodiments and variants, and an ultrasonic flow sensor for measuring sound and flow velocity, a pressure sensor for measuring the pressure, a temperature sensor for measuring the temperature, and a microthermal sensor for measuring the thermal conductivity and either the thermal capacity or a quantity of the gas or gas mixture dependent on the thermal capacity.