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COMSOL Multiphysics 案例库模型来自广泛的应用领域,包括电气、机械、流体和化工等行业。您可以下载现成即可使用的模型,以及详细的建模步骤说明,作为您建模工作的起点。请使用“快速搜索”查找与您的专业领域相关的模型,并登录或创建一个与有效的 COMSOL 许可证相关联的 COMSOL Access 帐户,下载模型文件。

Microphone grid free-field level correction curve for plane-wave incidence

This is a conceptual model of a microphone placed in an infinite baffle (flush mounted). The purpose is to determine the free-field level correction curve of the setup, which includes the exterior domain, microphone grid, and volume between the grid and the diaphragm. The microphone diaphragm is characterized with a simple RCL impedance and the open radiation condition is modeled with a Perfectly ...

MEMS Pressure Sensor Drift due to Hygroscopic Swelling

Modern integrated circuits are available as plastic encapsulated microcircuits (PEM). These devices are molded out of polymeric materials and epoxy resins in order to protect the internal semiconductors. Unfortunately, polymeric mold compounds absorb moisture when exposed to a humid environment, thus swelling and causing undesired strains, which can be as high as thermal strain. This model ...

Harmonic Content of the Power Deposition into a Dual Frequency Capacitively Coupled Plasma

Energy transfer from the time varying electrostatic field to electrons in a capacitively coupled plasmas (CCP) does not exclusively occur at twice the RF frequency. Due to the highly nonlinear mechanism of power transfer from the fields to the electrons, power deposition occurs at frequencies higher than twice the driving frequency. For dual frequency CCP reactors the harmonic content of the ...

Thin Layer Chronoamperometry

The common electroanalytical method of exhaustive amperometric detection in a microscopic thin layer is modelled as a 1D-symmetric diffusion problem. The simulated result agrees with the analytical Cottrell equation at short times, and deviates as expected at long times when the diffusion layer spans the thin layer cell.

Lorenz Attractor

A Lorenz attractor can be described by a system of ordinary differential equations: the Lorenz system. In the early 1960s, Lorenz discovered the chaotic behavior of this system for certain parameter values and initial conditions. The solution, when plotted as a phase space, resembles the figure eight. This example uses the Dormand-Prince explicit method for solving the ODEs and a Point ...

Ultra-high Vacuum, Chemical Vapor Deposition

Chemical vapor deposition (CVD) is a process often used in the Semiconductor industry to grow layers of high-purity solid material on top of a wafer substrate. CVD is achieved using many different techniques and across a range of pressures from atmospheric, to ultrahigh vacuum (UHV/CVD). UHV/CVD is performed at pressures below 10-6 Pa (10-8 Torr), so gas transport is achieved by molecular flow ...

Modeling a Conical Dielectric Probe for Skin Cancer Diagnosis

The response of a millimeter wave with frequencies of 35 GHz and 95 GHz is known to be very sensitive to water content. This model utilizes a low-power 35 GHz Ka-band millimeter wave and its reflectivity to moisture for non-invasive cancer diagnosis. Since skin tumors contain more moisture than healthy skin, it leads to stronger reflections on this frequency band. Hence the probe detects ...

Parameter Estimation for Nonideal Reactor Models

Real reactors can be modeled as combinations of ideal reactors. In this example the so-called "Dead zone model" is utilized. Two ideal CSTRs with interchange are set up to model the real reactor. One CSTR represents the highly agitated region and the other the less agitated region. For this, two parameters relating the volume and exchange rate of the two regions need to be found by comparing the ...

Programming of a Floating Gate EEPROM Device

This model calculates the current and charge characteristics of a floating gate Electrically Erasable Programmable Read-Only Memory (EEPROM) device. A stationary study demonstrates the effects of varying the charge stored on the floating gate by computing Current-Voltage curves as a function of the control gate voltage for two different amounts of stored charge. Time dependent studies are then ...

Wavelength Tunable LED

This application computes the emission properties of a AlGaN/InGaN LED. The emission intensity, spectrum, and efficiency are calculated for an applied voltage or as a function of voltage over a selected range. The indium composition in the light-emitting InGaN region can be varied in order to control the emission wavelength. When the emission occurs within the visible spectrum the corresponding ...