All machines have some accelerating parts and inertia forces are produced due to their masses. When the inertia effect is considered, it is called dynamic-force analysis.
For example, rotors operates at very high speed, even the slightest eccentricity of the center of mass from the axis of rotation produces very high dynamic forces. This may lead to vibrations, wear, noise or even machine failure.
Similarly at high speed the inertia forces in reciprocating engines produces inertia torque on the crankshaft. Inertia torque is a type of torque that arises in reciprocating engines due to the mass of the reciprocating components, such as the pistons and connecting rods. This torque can have a significant impact on the engine's operation and performance.
One of the main effects of inertia torque is that it causes the engine to vibrate during operation. This vibration can lead to increased wear and tear on the engine components and can also affect the engine's reliability and efficiency. In addition, the vibration caused by inertia torque can also produce unwanted noise and reduce the comfort of the passengers or the operator.
Here we have a simulation to analyze the effects of Inertia forces in Reciprocating Engines.
Create Necessary parts for a Simplified Reciprocating Engine.
- Crank
- Frame
- Connecting Rod
- Piston cylinder
Create Assembly
- Create a Physical Product
- Insert the frame, crank, piston and connecting rod, and orient them properly
- Go to Assembly section of the Action bar and select Engineering Connection
- Create Fix Engineering Connection to the frame
- Create a Revolute Engineering Connection between frame and the crank (Add a Controlled Hinge)
- Create a Revolute Engineering Connection between the crank and the connecting rod
- Create a Revolute Engineering Connection between the connecting rod and the piston
- Create a Cylindrical Engineering Connection between the piston and the frame.
Simulation and Analysis
- Open Mechanical Systems Design App
- Go to Mechanical Systems Design section of the Action bar.
- Create a mechanism using Mechanism representation command
- Test the motion using Mechanism Player
- Open Mechanical Systems Experience App
- Note: It will ask to Create a Simulation Object, Click OK
- Go to Scenario section of the Action bar
- Create a Law Excitation
- Select the revolute command of the mechanism as Support
- Angle Formula: Angle = `Excitations\\Law Excitation.2\\Time` *62.8rad/1sec
- Create Gravity Excitation
- Create Joint Force Probe for joints between Frame and Crank, Crank and Connecting rod, Connecting rod and Piston.
- Create a Dynamics Scenario with
- Excitation:
- Law Excitation
- Gravity Excitation
- Probe:
- Joint Force Probes
- Parameters:
- Start Time = 0s
- End Time = 0.1s
- Step Time = 0.0001s.
- Excitation:
- Select Compute and Generate Results
- Select View Scenario Results
- Select appropriate data and switch to Plot tab to view the graphs.
💪Powers of Mechanical System Design(MSD) ✅ Contact (⭐ friction, collision, etc.) ✅ Gravity ⭐ ✅ Axial Spring ✅ Bushing 💪Powers of Mechanical System Experience(MSE) ✅ Position Excitation ✅ Velocity Excitation ✅ Force Excitation ✅ Torque Excitation ✅ Sequence of Excitation ✅ Probes (⭐ position, speed, acceleration, joint force, etc.) ✅ Plots ✅ Traces Courses: Perform as a Mechanical and Shape Designer Practice CATIA Mechanical Systems Design Practice CATIA Mechanical Systems Experience Certification: 3DEXPERIENCE Mechanical Motion Designer - Associate
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