Multibody Dynamics Module
多体动力学模块是 结构力学模块 的扩展，为使用有限元分析（FEA）设计和优化多体动力学系统提供了一组高级工具。使您可以仿真由柔体和刚体组成的混合系统，其中每个体均有可能发生很大的旋转或平移。此类分析有助于确定多体系统中的关键点，从而使您可以执行更细致的元件级结构分析。多体动力学模块还使您可以自由地分析结构的各个部分受到的力，以及柔性组件中产生的应力，这可能导致由于大形变或疲劳而发生破坏。
- Model of a truck crane used for handling large loads. The simulation analyzes rigid body movement and predicts forces on the crane's axles and hydraulic cylinders. Results are used to optimize the position of link mechanisms in the base.
- A swashplate mechanism is used to control the orientation of helicopter rotor blades. This example shows an application derived from the model where only the pitch of the blades can be changed, but where both transient and eigenfrequency analyses can be presented.
- Model of a three-cylinder reciprocating engine, having both rigid and flexible parts, is used for maximizing the engine power and the design of structural components.
与 疲劳模块 组合对关键柔体进行疲劳分析
Three-Cylinder Reciprocating Engine
In this example, a dynamic analysis of a three-cylinder reciprocating engine is performed to investigate stresses generated during operation, thereby permitting identification of the critical components. Demand for high power output relative to the weight of the engine requires careful design of its components. This model of a reciprocating ...
Dynamics of a Double Pendulum
This is a tutorial model that shows how to model a hinge joint and use additional functionality including constraints, locking, spring-damper and prescribed motion. The model illustrates the nonlinear dynamics of the double pendulum. Locus of the tip of the lower arm and the phase space curve are plotted to demonstrate the chaotic behavior ...
Helicopter Swashplate Mechanism
This model illustrates the operation of a swashplate mechanism used in helicopters to translate the input of helicopter flight control into the motion of the rotor blades, and hence controls the orientation of the rotor blades. In this model, the rotor blades are modeled as either rigid bodies or flexible bodies in two different cases. All other ...
Stresses and Heat Generation in a Landing Gear Mechanism
This model simulates the dynamics of the shock absorber used in a landing gear mechanism of an aircraft. It analyses the stresses, as well as the heat generated in the landing gear components due to the energy dissipated in the shock absorber. A prismatic joint, with spring and damper, is used to model the shock absorber assembly.
Mechanical Assembly with Hinge Joint
This example illustrates how to model a barrel hinge connecting two solid objects in an assembly. In this model, the details of the connection are not the focus of the analysis, therefore, the hinge joint is modeled using a Joint feature in the Multibody Dynamics Module. The connected parts can be either rigid or flexible or a combination as shown ...
Spring Loaded Centrifugal Governor
A centrifugal governor is used to control the speed of rotating machinery. One of the most common applications is in controlling the RPM of an engine by regulating the fuel supply. This model illustrates the functioning of a spring loaded centrifugal governor. The dynamics of the governor are analyzed under the influence of a centrifugal ...
Slider Crank Mechanism
This is a benchmark model to test the numerical algorithms in the area of multibody dynamics. This model simulates the dynamic behavior of the slider crank mechanism. This mechanism goes through singular positions during its operation. The acceleration at a point is compared with the results from the reference.
Modeling Gyroscopic Effect
Gyroscopes are used for measuring the orientation or maintaining the stability of airplanes, spacecraft, and submarines vehicles in general. They are also used as sensors in inertial guidance systems. This model demonstrates the modeling of a mechanical gyroscope. It analyzes the response of the spinning disc to an external torque coming on the ...
Shift into gear
This model demonstrates the ability to simulate Multibody Dynamics in COMSOL. It comprises a multilink mechanism that is used in an antique automobile as a gearshift lever. It was created out of curiosity to find out how large forces are on the individual components. The model uses flexible parts, i.e. the Structural Mechanics Module was used ...
Dynamic Behavior of a Spring Loaded Rotating Slider
This model illustrates the modeling of slider motion caused by a base rotation. The motion of the slider is analyzed under various forces such as inertia force, centrifugal force, spring force and damping force. The prismatic joint, which is used to connect the two components, is spring loaded and also includes damping effects. The motion of ...