Defense

RecurDyn Multibody Dynamics Software seamlessly integrates the efficiency of a highly optimized recursive solver with advanced contact technology, delivering unparalleled simulation performance. Specifically tailored for applications in the defense sector, RecurDyn excels in reproducing zero- or low-gravity environments, enabling virtual simulations without compromising safety. It facilitates the validation of diverse algorithms through co-simulation with controllers, optimizing energy consumption by quantitatively evaluating operational energy requirements. The software proves instrumental in verifying the stability during take-off and landing of aircraft, spacecraft, helicopters, and drones. Additionally, it is employed for validating various industrial products, including simulations of landing gear, opening/closing mechanisms, and fixtures. RecurDyn further enables in-depth analyses of wing flap and slat mechanisms, and ensures the operational validation of deployable devices like solar panels and antennas on satellites. The software is also indispensable for conducting Noise, Vibration, and Harshness (NVH) analyses on intricate mechanisms such as helicopter rotor blades.

Tracked Vehicle

RecurDyn offers two toolkits completely dedicated to tracked vehicles. One is dedicated to low mobility vehicles (i.e. low speed vehicles) whereas the second one to high mobility vehicles (i.e. high speed). In the present example a tracked bulldozer has been simulated to evaluate the dynamic behavior of the vehicle on different terrains and obstacles. The model can be used to calculate the loads on the vehicle structure and to analyze in detail the forces acting between the links. The toolkit contains several entities which can be automatically included in the model and personalized based on user data. Furthermore RecurDyn solver offers unparalleled performances when solving this kind of problems, delivering reliable results in short time.

Changing law of launching pitching angular velocity of rotating missile

In order to provide accurate launching pitching angular velocity (LPAV) for the exterior trajectory optimization design, multi-flexible body dynamics (MFBD) technology is presented to study the changing law of LPAV of the rotating missile based on spiral guideway. An MFBD virtual prototype model of the rotating missile launching system is built using multi-body dynamics modeling technology based on the built flexible body models of key components and the special force model. The built model is verified with the frequency spectrum analysis. With the flexible body contact theory and nonlinear theory of MFBD technology, the research is conducted on the influence of a series of factors on LPAV, such as launching angle change, clearance between launching canister and missile, thrust change, thrust eccentricity and mass eccentricity, etc. Through this research, some useful values of the key design parameters which are difficult to be measured in physical tests are obtained. Finally, a simplified mathematical model of the changing law of LPAV is presented through fitting virtual test results using the linear regression method and verified by physical flight tests. The research results have important significance for the exterior trajectory optimization design.

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A rigid flexible coupling dynamics simulation of one type of tracked vehicle based on the RecurDyn

In order to get the load and stress of the key parts of the tracked armored vehicle. A rigid flexible coupling dynamics model of tracked armored vehicle is established, also the simulation road is established based on typical test field. The simulation analysis accurately simulated dynamic characteristics of vehicle, and the transient response of torsion bar in typical road excitation is obtained. It is important that the dynamic load and dynamic stress history of the torsion bar are obtained. It avoids the difficulty of torsion bar load testing, and provides a new idea for the acquisition of complicated structure load and stress of tank and armored vehicle, also provides an important dynamic load and time stress data for the following fatigue calculation.

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Tracked Vehicle Dynamics Modeling and Simulation Methodology, with Control, using RecurDyn Software

Many Army vehicles require tracks in order to meet the tough mobility requirements for the Army mission profile. Modeling and Simulation (M&S) provides a large cost-savings and offers a quick turnaround when addressing vehicle performance issues. Once a baseline model is built for a given system, the model can be changed quickly to address different load or usage profiles and to determine the overall affect on the vehicle and its performance. Tracked vehicles present a number of challenges, however, due to the large number of interactions between all the track and suspension components. Prior methods for analyzing tracked vehicle performance through M&S led to either simplified vehicle models or very long compute times due to the level of detail required to properly model tracked vehicles.

RecurDyn offers a number of potential benefits by using a recursive dynamic formulation which takes advantage of the fact that every track shoe is the same and that each track segment is connected to one another in the same manner. The software exploits this symmetry to greatly reduce model development times, complexity, and computational run times. RecurDyn features a user-friendly, graphical user interface (GUI), or front end, and a track-building toolkit (a.k.a. Trackbuilder). This front end saves time building the models by eliminating repeated processes, allowing the user to define one track segment and repeat it around the track loop. The software package also includes a built-in control program called CoLink, which can be used to control and drive vehicle models. 

A methodology and library of standard templates were developed by the author to enhance the usability of RecurDyn specific to tracked vehicles. The end result is a dramatic decrease in tracked vehicle model build and run times, which in many cases makes simulation a faster, more cost effective option than the build-test-break-fix-test cycle of the past. These methodologies and templates are intended to serve as a reference for future TARDEC engineers learning to model tracked vehicles. To date, these templates include: path following terrain profiles, NATO double lane change, side slopes, performance on grades, and steady state turning circles. Additional events will be programmed as needed and added to the library. The final conclusion of this effort is that RecurDyn is both useful and powerful, and that RecurDyn may be the future for 3-Dimensional multi-body dynamics M&S work for tracked vehicles.

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