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This is a collection of analysis examples including the stability (behavior) analysis of washing machines, eigenvalue optimization analysis of magnetic heads, frequency response analysis of traveling wave ultrasonic motors, and induction heating analysis, among others. Additionally, there are analysis cases not included in the collection, so please contact us if you are interested in any specific analysis examples.

This is a collection of analysis examples including model analysis of railway vehicles, sloshing analysis of ships, airflow analysis inside railway vehicles, large-scale finite element analysis of train vehicle dynamics, and hull strength analysis. Additionally, there are analysis cases not included in the collection, so if you are interested in any specific analysis case, please feel free to contact us.

This is a collection of analysis examples including shape optimization analysis, nonlinear transient analysis of brake rotors, pressure distribution analysis of brake pads, and behavior analysis of diaphragm springs through nonlinear static analysis. Additionally, there are analysis cases not included in the collection, so please contact us if you are interested in any specific analysis cases.

**Case Summary** ■Product Name: Simcenter Femap with Nastran ■Industry: Architecture Using high-rigidity lightweight aluminum extrusion materials, various frame structures can be assembled. When designing these structures, it is necessary to investigate the deformations, stresses, and vibration characteristics that occur during use to ensure functionality and safety. In FEM analysis of frame structures, it is common to model using beam elements; however, the cross-section of aluminum extrusion materials is complex, and traditional beam element outputs cannot display the characteristics of detailed sections. On the other hand, modeling thin-walled structures with solid elements is challenging, and creating high-quality meshes results in large models that require significant computational resources and high-performance post-processing. This example demonstrates the applicability of Simcenter Femap with Nastran for such analyses. For more detailed information, please refer to the catalog or contact us directly.

**Case Overview** ■Product Name: Simcenter Femap with Nastran ■Industry: Mechanical Components The super-element feature of Simcenter Nastran reduces computational load by dividing large models for analysis or by simplifying parts of the model (external super-elements), thus making the analysis model smaller and shortening computation time when changes are made to other parts. In this case, we validated the analysis accuracy and evaluated the reduction in computation time by simplifying the unchanged boss section as an external super-element and analyzing it in conjunction with the mesh model of the blade section during the eigenvalue design of the fan blades. This method saves computation time, especially in design phases where performance evaluations and repeated calculations at the component level are common, and the more unchanged parts there are, the more significant the benefits. Additionally, by converting in-house component models into super-elements and providing them to other companies, the shapes can be treated as black boxes, thus enhancing information security. □ For other features and details, please refer to the catalog.

**Case Overview** ■Product Name: Femap Thermal ■Analysis: Thermal Analysis ■Industry: Other In this analysis example, we conducted a thermal radiation transfer analysis within a container composed of multiple radiation areas. In this case, the radiation areas consist of three regions: the interior of the container, which includes the heat source, heated surface, and inner wall; the space between the inner and outer walls; and the area from the outer wall to the environment. The calculation of the form factor is known to be time-consuming due to the exhaustive element-to-element calculations, resulting in a large matrix size. Femap Thermal utilizes the Hemicube method with OpenGL to process the time-consuming form factor calculations quickly. Additionally, with a dedicated interface for thermal analysis, it is easy to set up radiation configurations even for models with multiple enclosures. □ For other features and details, please refer to the catalog.

**Case Overview** ■Product Name: Femap Thermal ■Analysis: Thermal Analysis ■Industry: Mechanical Components Modeling can be challenging when it comes to thermally connecting components due to thermal resistance from contact or thermal conduction at adhesive points. By using the thermal coupling feature, it is possible to define conductive conductance, thermal conductivity, or thermal resistance values between distant meshes that do not share nodes, allowing for thermal coupling between these meshes in calculations. This is an excellent feature that automatically considers the positional relationships of elements and allocates the degree of thermal coupling for each element. In this analysis case, we will analyze the temperature distribution due to heat generation from a chip in a structure consisting of four types of components: chip, substrate, edge guide, and case. The adhesion between the chip and substrate, as well as the edge guide that connects the substrate and case, were modeled using thermal coupling. □ For other functions and details, please refer to the catalog.

**Case Summary** ■Product Name: Simcenter Femap with Nastran ■Analysis: Modal Analysis ■Industry: Railways and Shipping Since railway vehicles operate in a coupled manner, it is necessary to analyze the motion characteristics of the entire train when considering the dynamics of the vehicles. To accurately predict the vibrations generated in various parts of the moving vehicles, a vehicle simulation using a FEM model that closely resembles the actual structure, rather than a uniform beam or equivalent plate structure, is required. On the other hand, such analyses heavily depend on the computational environment, model creation, and result display capabilities, necessitating parallel computing solutions and efficient pre/post-processing software. In this example, a vehicle body was created using Simcenter Femap, and a modal analysis of a 10-car train model was conducted using Simcenter Nastran to determine the natural frequencies up to 20 Hz.

**Case Overview** ■Product Name: Simcenter Femap with Nastran ■Analysis: Nonlinear Static Analysis ■Industry: Mechanical Components Plastic processing primarily involves shaping through contact between tools and workpieces. Among these, the method of forming bottomed containers from metal sheets using a punch and die is called deep drawing. Various factors such as the structure and material of the mold, the shape of the blank, and friction conditions influence the process, causing changes in the stress distribution in different parts of the blank during forming, which can lead to issues like cracking and wrinkling. This analysis example introduces a case of deep drawing for a rectangular box-shaped container. The initial shape of the blank is 200x200 with a thickness of 0.82mm. The die is a rigid flat plate with a square hole measuring 102.5x102.5 and rounded corners with a radius of 10mm. The punch is a rigid body measuring 100x100 with a step, and similarly, the wrinkle suppressor is also a rigid flat plate. □ For other functions and details, please refer to the catalog.

**Case Summary** ■Product Name: Simcenter Femap with Nastran ■Analysis: Frequency Response Analysis ■Industry: Other In this analysis example, synchronous and asynchronous frequency analyses of a rotating body in a fixed coordinate system were conducted. The former is an analysis where the rotation speed and the excitation load frequency match, resulting in a response peak at the danger speed point on the 1P line in the Campbell diagram. The latter involves a rotor rotating at a constant speed with a varying excitation load frequency, leading to rotor resonance at the intersection points of each mode with the vertical line in the Campbell diagram. □ For other features and details, please refer to the catalog.

**Case Overview** ■Product Name: Simcenter Femap with Nastran ■Analysis: Linear Transient Analysis ■Industry: Other Transient response analysis calculates the vibration characteristics of the rotor when increasing the rotational speed and the behavior during passing through the critical speed. In addition to synchronous and asynchronous analyses like frequency analysis, it is also possible to perform analyses where the rotational speed is increased while keeping the rotational speed constant or the excitation frequency constant. This is an analysis along a single point or horizontal line in the Campbell diagram. □ For other features and details, please refer to the catalog.

**Case Overview** ■Product Name: Simcenter Nastran ■Analysis: Modal Analysis of Natural Frequencies ■Industry: Other The vibration characteristics of rotating bodies exhibit whirl motion due to centrifugal force, tilt vibrations, and gyroscopic effects as the axis rotates, resulting in changes in eigenvalues. When the direction of rotation and whirl motion align, it is referred to as forward whirl; when they are opposite, it is called backward whirl. When the rotational speed matches the eigenvalue of the axis, the amplitude of the whirl increases, leading to instability in the rotating system and potential damage to components. The speed at this point is referred to as the critical speed. In this analysis, modal complex eigenvalue analysis was conducted for specified rotational speeds to investigate the whirl modes induced by rotation, changes in damping, and critical speeds. □ For other functions and details, please refer to the catalog.

**Case Overview** ■Product Name: Simcenter Nastran ■Analysis: Eigenvalue analysis, linear transient analysis, frequency response analysis ■Industry: Mechanical components Stable operation is extremely important for various rotating machinery such as turbines, jet engines, generators, fluid equipment, and electric products, and vibration prevention is an essential challenge. In this example, we will introduce the rotating system analysis capabilities of Simcenter Nastran using a representative model of rotor dynamics. □ For other features and details, please refer to the catalog.

**Case Overview** ■Product Name: Simcenter Femap with Nastran ■Analysis: Linear Static Analysis, Modal Analysis, Frequency Response Analysis ■Industry: Other A cantilever is a sensor that detects the interaction force between the probe and the sample in an atomic force microscope by measuring changes in displacement or resonance frequency. It is applied in fields such as precision machining and measurement of nanostructures. Since the detection sensitivity is determined by the mechanical properties of the cantilever, it is very important to determine those properties. However, the spring constant and resonance frequency of the cantilever can vary significantly depending on the environment in which it is vibrated. In this analysis example, we used the virtual fluid capabilities of Simcenter Nastran to investigate the changes in the natural frequency of the cantilever in vacuum, atmospheric, and underwater conditions. □ For other functions and details, please refer to the catalog.

**Case Overview** ■Product Name: Simcenter Femap with Nastran ■Analysis: Nonlinear Static Analysis ■Industry: Other Buckling is a deformation that exhibits very strong nonlinear characteristics. When buckling occurs, the strength and stiffness of the structure decrease sharply, leading to instability. Thin-walled shell structures, like the one shown in the right diagram, have many local failure modes in addition to overall compressive buckling. During the buckling process, there is also contact within the shell itself. This analysis example presents the nonlinear analysis results for the nonlinear buckling problem of shell structures. □ For other features and details, please refer to the catalog.

**Case Overview** ■Product Name: Simcenter Femap with Nastran ■Analysis: Nonlinear Static Analysis ■Industry: Mechanical Components Buckling is a deformation that exhibits very strong nonlinear characteristics. When buckling occurs, the strength and stiffness of the structure decrease sharply, leading to instability. Thin-walled frame structures, like the one shown in the right diagram, have many failure modes, and buckling can cause extremely large deflections in the frame. Since part of the model may transition from an elastic state to a plastic state and back from plastic to elastic, the analysis becomes quite complex. This analysis example presents the nonlinear analysis results for the elasto-plastic buckling problem of frame structures. □ For other features and details, please refer to the catalog.

**Case Summary** ■Product Name: Simcenter Femap with Nastran ■Analysis: Linear Static Analysis ■Industry: Railways and Shipping Finite element method strength calculations are widely used in hull design. The hull structure, composed of many components such as decks, side plating, double bottoms, bulkheads, and longitudinal and transverse strength frames, is complex, making it difficult to analyze just a part of it. This example created a full model close to the actual structure and conducted a strength analysis of the entire hull model. - The mesh generation feature of Simcenter Femap allows for the creation of complex hull FEM models. - Creation and management of loads such as static/dynamic water pressure and cargo conditions. - Improved computational efficiency through continuous analysis of multiple load cases. - The parallel processing capability of Simcenter Nastran enables analysis of large-scale models. □ For other features and details, please refer to the catalog.

**Case Summary** ■Product Name: Simcenter Femap with Nastran ■Analysis: Modal Analysis and Frequency Response Analysis ■Industry: Architecture Indoor acoustic characteristics are very complex, and the influence of standing waves on acoustic properties is significant. The acoustic analysis of Simcenter Nastran is a fluid-structure interaction analysis that examines the vibrations within a container filled with fluid. In this analysis, the standing waves in a rectangular room were calculated, and the frequency characteristics of the acoustics driven by a point sound source were determined. *Note 1: Simcenter Nastran includes elements for sound absorption and damping (acoustic absorbers/acoustic barriers), but this analysis does not take them into account. The walls of the room are considered to be perfect reflectors.* □ For other features and details, please refer to the catalog.

**Case Overview** ■Product Name: Simcenter Femap with Nastran ■Analysis: Frequency Response Analysis ■Industry: Electrical and Electronics Ultrasonic motors are actuators that generate ultrasonic vibrations in the stator through piezoelectric elements, driving the rotor via frictional force. They feature low speed and high torque without gears, fast response, high holding torque, quiet operation, and non-magnetic properties. Practical applications are being advanced in various fields such as optical devices, precision instruments, information equipment, medical devices, and transportation equipment. In this analysis, two bending vibrations with a 90° phase difference were excited in the stator of disk-type and ring-type traveling wave ultrasonic motors, and the behavior of the traveling wave and the elliptical trajectory of arbitrary points on the vibrating body were confirmed. *Note: Since Simcenter Nastran does not have piezoelectric analysis capabilities, excitation was performed using force loading instead of voltage drive.* □ For other functions and details, please refer to the catalog.

【Case Overview】 Containers for storing liquids, such as water tanks and oil tanks, experience a sloshing phenomenon where the free surface of the liquid inside the container oscillates at relatively low frequencies when subjected to vibrations. In this analysis, we utilized the virtual fluid boundary and phantom elements of Simcenter Nastran to analyze the characteristics when the bottom of the tank is excited in the horizontal direction. *Note: It is possible to model fluids without creating elements.* □ For other features and details, please refer to the catalog.

◆◆Publication Content◆◆ ○Analysis of large-scale models using cluster machines 　 (Simcenter Nastran SOL101 SOL103) ○Keywords: Cluster machines, parallel computing, large-scale models 　　　　　　　 Train vehicles, distributed memory parallel processing ○Case Overview ●For other features and details, please refer to the catalog.

◆◆Publication Content◆◆ ○ Stability analysis of the spin basket using rotor dynamics (Simcenter Nastran) ○ Keywords: Rotor dynamics, spin basket, washing machine, vibration, dangerous speed ○ Case Summary When spinning in a washing machine, the spin basket experiences intense vibration before stabilizing its rotation. This occurs as it passes through a dangerous speed, which is an essential factor for considerations such as noise reduction. In this analysis example, the spin basket was modeled, and the motion from a stationary state to a steady rotational state (5 revolutions per second) was calculated over time. ● For other features and details, please download the catalog.

◆◆Publication Content◆◆ ○Casting cooling simulation using heat transfer and thermal stress analysis (Simcenter Nastran SOL 159/SOL 401) ○Keywords: Nonlinear thermal stress analysis, casting heat transfer, cooling rate, residual stress, shrinkage cavity, solidification shrinkage cavity ○Case Summary ●For other features and details, please refer to the catalog.

NASTRAN is an analysis program born from a space program where failure is not an option, and for over 40 years, it has maintained high reliability and a proven track record in meeting the stringent demands of various fields such as aerospace/defense, construction, automotive, shipbuilding, machinery, and electrical/electronics. Simcenter Nastran inherits this high reliability and proven track record while incorporating the latest analysis technologies, making it a solution suitable for the 21st century. 【Features】 - Supports large-scale problems and advanced nonlinear analysis - Flexible selection of the number of implementations based on analysis content - Operates on multiple operating systems such as Windows, UNIX, and Linux - Supports 64-bit modules, memory-shared parallel processing, and parallel processing on cluster machines 【Available Analyses】 - Linear static analysis: SOL101 - Eigenvalue analysis: SOL103 - Buckling analysis: SOL105 - Steady-state heat conduction analysis: SOL153 - Transient heat conduction analysis: SOL159 - Linear transient analysis: SOL109/112 - Frequency response analysis: SOL108/111 - Response spectrum analysis: SOL109/112, etc. *There are also various other modules available, so please contact us for more detailed information.

We will introduce a case study of control system analysis using nonlinear transient analysis with Simcenter Femap and Nastran.

We will introduce a case study of analysis using Simcenter Femap with Nastran, focusing on the vibration characteristics simulation of dental instruments - ultrasonic scalers.

【Case Overview】 ■Product Name: Simcenter Femap with Nastran There has been an image that Super Elements (SE) are only applicable in the aerospace and automotive fields and can only be used by a few dedicated analysts. There has been no pre-post that fully supports SE analysis, and the data creation process has been complicated, which has hindered its widespread adoption until now. Simcenter Femap supports external Super Elements from Simcenter Nastran, making SE analysis accessible to everyone.

**Case Overview** ■Product Name: Simcenter Femap with Nastran ■Industry: Mechanical Components Simcenter Nastran allows for various analyses considering pre-tensioned bolts (linear static analysis, nonlinear static analysis SOL601, linear buckling analysis, etc.). Using the Simcenter Femap interface, modeling of bolt connections with beam elements, bar elements, and solid elements, as well as the setting of bolt loads, can be done easily. This case modeled the bolts with bar elements and solid elements and compared the results from both. Two brackets with a surface static friction coefficient of 0.15 were fastened with M10 bolts. The axial force was set to 150 kgf, one side was fixed, and linear static analysis was performed (Figure 1). From the comparison of the results of the bar elements and solid elements, it was found that the maximum and minimum Mises stress and maximum and minimum displacement of the two brackets were the same for both methods. ● For other features and details, please refer to the catalog.

This is a collection of analysis examples including seismic motion analysis of structures, wind analysis of high-rise buildings, analysis of liquid storage tanks under seismic conditions, natural frequency and frequency response analysis of reinforced concrete (SRC) structures, and acoustic analysis of audio rooms. Additionally, there are analysis cases not included in the collection, so please contact us if you are interested in any specific analysis cases.

This is a collection of case studies on structural analysis, buckling analysis, thermal analysis, and more of mechanical elements. Additionally, there are analysis cases not included in the collection, so please contact us if you are interested in any specific analysis case.

**Case Overview** ■Product Name: Simcenter Fema with Nastran ■Industry: Construction There are many structural forms for containers that store liquids and their supports. During an earthquake, the sloshing of the liquid surface inside the tank generates dynamic liquid pressure that acts on the container's side walls and bottom plate, leading to tank damage and rocking vibrations that can cause parts of the bottom plate to lift, resulting in tank damage. This case study utilized the virtual fluid boundary and phantom elements of Simcenter Nastran to perform transient response analysis on three types of tanks, as shown in the right diagram, using the seismic waves from the 2011 Great East Japan Earthquake (M9). Below, we present the sloshing behavior and dynamic liquid pressure distribution during the earthquake. * Downloaded from K-NET For more detailed information, please refer to the catalog or contact us directly.