Functions/GenXdev.Helpers.Physics/Get-ResonantFrequencyByLengthAndSpeed.cs
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// ################################################################################
// Part of PowerShell module : GenXdev.Helpers.Physics // Original cmdlet filename : Get-ResonantFrequencyByLengthAndSpeed.cs // Original author : René Vaessen / GenXdev // Version : 3.26.2026 // ################################################################################ // Copyright (c) 2026 René Vaessen / GenXdev // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // ################################################################################ using System.Management.Automation; namespace GenXdev.Helpers.Physics { [System.ComponentModel.Description(@" .SYNOPSIS Calculates resonant frequency for a closed pipe. .DESCRIPTION Uses f = v / (4 L) for fundamental frequency. .EXAMPLE ```powershell Get-ResonantFrequencyByLengthAndSpeed -LengthInMeters 0.5 -Medium ""air"" -As ""kilohertz"" ``` Calculates the resonant frequency for a 0.5 meter pipe in air, output in kilohertz. .EXAMPLE ```powershell Get-ResonantFrequencyByLengthAndSpeed 1 -SpeedInMetersPerSecond 343 ``` Calculates the resonant frequency for a 1 meter pipe with wave speed 343 m/s. ")] [Cmdlet(VerbsCommon.Get, "ResonantFrequencyByLengthAndSpeed")] [OutputType(typeof(double))] public class GetResonantFrequencyByLengthAndSpeedCommand : PSGenXdevCmdlet { /// <summary> /// Length in meters /// </summary> [Parameter( Mandatory = true, Position = 0, HelpMessage = "Length in meters")] public double LengthInMeters { get; set; } /// <summary> /// Wave speed in m/s /// </summary> [Parameter( Mandatory = true, Position = 1, ParameterSetName = "BySpeed", HelpMessage = "Wave speed in m/s")] public double SpeedInMetersPerSecond { get; set; } /// <summary> /// The medium /// </summary> [Parameter( Mandatory = true, Position = 1, ParameterSetName = "ByMedium", HelpMessage = "The medium")] [ValidateSet("air", "water", "seawater", "steel", "glass", "lead", "gold", "copper", "rubber", "vacuum", "helium", "co2", "methane")] public string Medium { get; set; } /// <summary> /// Output unit for frequency /// </summary> [Parameter( Mandatory = false, Position = 2, HelpMessage = "Output unit for frequency")] [ValidateSet("hertz", "kilohertz", "megahertz")] public string As { get; set; } = "hertz"; /// <summary> /// Begin processing - initialization logic /// </summary> protected override void BeginProcessing() { // Check if using ByMedium parameter set if (ParameterSetName == "ByMedium") { // Set speed based on medium switch (Medium.ToLower()) { case "air": SpeedInMetersPerSecond = 343; break; case "water": SpeedInMetersPerSecond = 1480; break; case "seawater": SpeedInMetersPerSecond = 1530; break; case "steel": SpeedInMetersPerSecond = 5960; break; case "glass": SpeedInMetersPerSecond = 4540; break; case "lead": SpeedInMetersPerSecond = 1210; break; case "gold": SpeedInMetersPerSecond = 3240; break; case "copper": SpeedInMetersPerSecond = 4600; break; case "rubber": SpeedInMetersPerSecond = 60; break; case "vacuum": SpeedInMetersPerSecond = 0; break; case "helium": SpeedInMetersPerSecond = 965; break; case "co2": SpeedInMetersPerSecond = 259; break; case "methane": SpeedInMetersPerSecond = 430; break; } // Write verbose message WriteVerbose($"Using wave speed in {Medium}: {SpeedInMetersPerSecond} m/s"); // Check for vacuum if (SpeedInMetersPerSecond == 0) { // Throw terminating error for vacuum ThrowTerminatingError(new ErrorRecord( new Exception("No wave propagation in vacuum"), "VacuumError", ErrorCategory.InvalidArgument, null)); } } } /// <summary> /// Process record - main cmdlet logic /// </summary> protected override void ProcessRecord() { // Calculate frequency using f = v / (4 * L) double frequency = SpeedInMetersPerSecond / (4.0 * LengthInMeters); // Store frequency for end processing this.frequency = frequency; } /// <summary> /// End processing - cleanup and output logic /// </summary> protected override void EndProcessing() { // Convert frequency using GenXdev\\Convert-PhysicsUnit var scriptBlock = ScriptBlock.Create( "param($value, $fromUnit, $toUnit) " + "GenXdev\\Convert-PhysicsUnit -Value $value -FromUnit $fromUnit -ToUnit $toUnit"); // Invoke the script block var results = scriptBlock.Invoke(frequency, "hertz", As); // Get the result as double double result = (double)results[0].BaseObject; // Write the result WriteObject(result); } // Private field to store frequency between ProcessRecord and EndProcessing private double frequency; } } // ############################################################################### |