These interfaces are used for simulating one-way interaction of a background fluid flow with an acoustic field. There are different physics interfaces that solve the governing equations under various physical approximations.
The linearized Navier—Stokes interfaces are used for solving for the acoustic variations in pressure, velocity, and temperature. The linearized Euler interfaces are used for computing the acoustic variations in density, velocity, and pressure in the presence of a stationary background mean flow that is well approximated by an ideal gas flow.
Special boundary mode interfaces are available for computing propagating and nonpropagating modes in waveguides and ducts in the presence of a background flow. For simplified analysis, interfaces for linearized potential flow can be used in both the time and frequency domains. To model an unbounded computational domain, you can truncate it using so-called perfectly matched layers PMLs in both time and frequency domains.
Alternative methods include using radiation boundary conditions or an exterior domain modeled using a boundary element method interface. For finite-element-based interfaces, an exterior field calculation feature can be used to determine the pressure in any point outside the computational domain. Dedicated results and analysis capabilities exist for visualizing the radiation pattern of the exterior field near and far field in polar, 2D, and 3D plots. The computational method is based on the FEM discretization of Lighthill's acoustic analogy wave equation.
This formulation of the equations ensures that any solid fixed or vibrating boundaries are implicitly taken into account. The functionality relies on coupling an LES fluid flow simulation, using the CFD Module, to an aeroacoustic flow source for pressure acoustics, available in the Acoustics Module. There is a large variety of boundary conditions available for pressure acoustics, including hard walls and conditions for applying sources.
There are radiation, symmetry, periodic, and port conditions for modeling open boundaries. Impedance conditions include models for different parts of the human ear, human skin, simple RCL circuit models, and more. By using the interface for boundary mode analysis, you can study propagating modes in the cross sections of waveguides and ducts.
The options for modeling idealized sources include built-in options for monopole, dipole, and quadrupole point sources. The interfaces for acoustic—structure interaction apply to phenomena where the fluid pressure causes a load on the solid domain and the structural acceleration affects the fluid domain across the fluid—solid boundary.
This is also known as vibroacoustics. The interfaces include the capability of solving in either the frequency or the time domain. The solids included in the simulations can be isotropic, anisotropic, porous, or piezoelectric. By combining with the Structural Mechanics Module, the structural side of the coupling can additionally include structural shells or membranes.
By combining with the Multibody Dynamics Module, you can include the effects of multiple moving rigid or flexible parts connected through various types of joints. In order to accurately model acoustics in geometries with small dimensions, it is necessary to include thermal conduction effects and viscous losses explicitly in the governing equations.
This capability is included in the interfaces for thermoviscous acoustics, which simultaneously models the effects of pressure, particle velocity, and acoustic temperature oscillations.
Near walls, there are viscous and thermal boundary layers. Here, viscous losses due to shear and thermal conduction become important because of large gradients.
For this reason, it is necessary to include thermal conduction effects and viscous losses explicitly in the governing equations.
Thermoviscous acoustics is, for example, used when modeling the response of small transducers like microphones and receivers, also known as microacoustics.
The interfaces are available for solving in both the frequency and time domains. In the time domain, nonlinear effects can also be modeled. For analyzing transient linear ultrasound devices and processes, you can use the convected wave equation user interface. This interface can be used to efficiently solve large transient linear acoustic models containing many wavelengths in a stationary background flow.
For simulating the propagation of high-amplitude nonlinear acoustic waves, you can use the nonlinear pressure acoustics user interface. This interface includes special functionality for capturing shocks. Both interfaces include absorbing layers that are used to set up effective nonreflecting-like boundary conditions. The interfaces are based on the discontinuous Galerkin method and use a computationally efficient time-explicit solver.
For running simulations in the high-frequency limit, where the acoustic wavelength is much smaller than the characteristic geometric features, you can use the user interfaces for ray acoustics.
In addition, for quick analyses, there is a user interface for solving the acoustic diffusion equation, also known as energy finite elements. Both user interfaces are suited for modeling acoustics in rooms and concert halls. The ray acoustics interface can also be used in outdoor or underwater scenarios, for example.
The ray acoustics interface is used to compute the trajectories, phase, and intensity of acoustic rays. It includes the capabilities of impulse response analysis, showing the level decay curves and computed objective room acoustic metrics, such as EDT, T 60 values, etc. A more approximate way of introducing losses is to use the equivalent fluid models available in the pressure acoustics interfaces. In a homogenized way, this introduces attenuation properties to the bulk fluid that mimic different loss mechanisms.
The fluid models include losses due to bulk thermal conduction, viscosity and relaxation in the atmosphere air and the ocean seawater , and models for simulating the damping in porous materials.
In addition to the Thermoviscous Acoustics interface that simultaneously models the effects of pressure, particle velocity, and acoustic temperature oscillations, the Pressure Acoustics interface can also account for thermoviscous boundary layer losses. Narrow-region acoustics can be used in narrow ducts and waveguides of constant cross sections, while the thermoviscous boundary layer impedance BLI condition is applicable for geometries larger than the boundary layer.
When applicable, the equivalent fluid and homogenized models are computationally very efficient. However, for representing losses in porous materials with higher fidelity, you can combine pressure acoustics with the effects of poroelastic wave propagation.
Dynamix can be applied to any rotating or reciprocating machine in your facility, while configured to monitor each machine uniquely and provide the most meaningful information. This system can provide data for many different applications - to protect or to monitor an asset, to improve or deliver quality objectives, or to enable a condition-based maintenance or a predictive maintenance program.
Emonitor software provides you with a comprehensive suite of tools for long-term trending, plotting and alarming capabilities to detect the earliest possible indicators of developing machine faults. Our Condition Monitoring Sensors support vibration and position measurements for most applications in extreme temperatures environments and hazardous locations. Our Bulletin Series Accelerometer sensors are used to measure vibration on industrial machinery.
They can support your predictive maintenance efforts and provide key machinery vibration diagnostics. The solution is based on the Grafana open source project which was enhanced by Dewesoft to support features like vector display FFT and selective loading of historical data which dramatically speeds up the loading of long term data in the displays.
Cloud Software infrastructure is available for graphical representation of the machine state. Visualization and monitoring technology of long-term trends is available. On top of that thresholds and alarms are available to be used in combination with e-mail or SMS notifications. The user interface can be easily customized according to customer's requirements.
The database can run on a local server or in the cloud. Several industrial interfaces and protocols are open either to serve or read data. Any number of the acquired channel can be integrated acceleration to velocity or derived displacement to velocity.
Acceleration, velocity, and displacement channels are preconfigured for machine monitoring needs. The software offers a very simple way to display and visualize acceleration, velocity, and displacement waveform, and spectrum plots, all in real-time. DewesoftX 3D graph visual component is, therefore, an indispensable tool for continuous condition monitoring.
The order tracking software module supports both typical analysis types:. The monitoring software automatically detects the operation mode and provides order domain data over time during continuous operation and over RPM during run-up and coast-down. Order amplitude values over time or over RPM can be extracted in their own channels that can be used for further computation. The software allows for simple identification of machine parts in the frequency spectrum:.
Machine parts are defined by their characteristic multiplier of the base RPM. Harmonic markers help distinguish between harmonic and base frequencies. Markers can be used with any quantity on the horizontal axis:. Enveloped acceleration is used to demodulate high-frequency acceleration spikes into the characteristic bearing and gear mesh frequencies. The software module identifies the frequencies of interest in the spectrum for each part of the bearing.
Check out the Bearing envelope analysis brochure from Dewesoft. The extracted channel can be converted into the frequency domain and subtracted from the original spectrum. This allows the user to remove frequency bands specific to a certain machine part from the spectrum and analyze only the remainder of the spectrum in a separate channel. After the monitoring software detects unbalance, the Dewesoft X DAQ software offers a rotor balancer module that provides an intuitive step-by-step approach to balance the rotors:.
Octave band analysis is used for condition monitoring based on a machine sound footprint over a wide frequency range. Torsional vibrations are quite often a source of issues and faults on long shafts. Rotational and torsional vibration module provides in-depth analysis into torsional angle behavior between two ends of a shaft as well as into vibration of the rotating velocity. Orbit analysis is a necessary tool for vibration analysis of rotating machinery. The process is essentially an extension of time waveform analysis plotting time-domain data from a pair of orthogonal probes on an orbit graph with consideration for the physical location of the proximity probes.
Out of the box, Dewesoft Orbit Analysis Solution packs the entire set of industry-proven analysis metrics, supporting calculation and graphical representation of:. Precise rotor movement measurements and advanced analysis tailored for turbomachinery applications. Dewesoft Orbit Analysis is a complete solution that will help you improve the operating efficiency, lower wear, and prevent any potential critical failures of your machine.
Dewesoft orbit analysis system is a great investment and comes with lifetime FREE software updates bringing all future updates free of charge. Order analysis is a technique for analyzing noise and vibration signals in rotating or reciprocating machinery that runs at a steady or varying speed.
It can provide complete diagnostics of generators, combustion engines, compressors, turbines, pumps, and rotating shafts. The Dewesoft solution is extremely powerful. In combination with other measurement and analysis features like orbit analysis , torsional vibration , combustion engine analysis , and power analysis , it is the only available solution on the market that provides a complete set of tools for rotating machinery analysis.
Dewesoft offers a real-time, simple-to-use order tracking analysis solution at an attractive price, bundled with an industry-leading 7-year warranty , lifetime FREE software updates, and FREE technical support.
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