Stabilization damping factor ansys 0. com) I don't know what Elastic Slip Tolerance is or what it controls. Two new real constants on the contact elements, FDMD and FDMS, allow you to control how squeal damping is applied. Stabilization Damping Factor 这个选项只有在选择Frictional ,rough,frictionless这三个非线性接触类型时才会出现 零件之间的初始状态可能不是完全接触上的，或是积分点之间有一定的距离，计算一开始无法探测到零件之间的接触，可能会产生刚性位移。 稳定化数值阻尼系数 (Stabilization Damping Factor)： 当接触面存在一个小空隙时，添加阻尼增强收敛性； 应设置一个合适大小的阻尼，阻止刚体运动，同时防止引入的阻尼过大影响结果； 通常设置为1. Contact between the spring and the blocks is stabilized by adding contact damping with default damping coefficients as shown by the following KEYOPT and RMODIF commands: Sets the Stabilization Damping Factor for a given solution step. You are prohibited from providing (i) information that is confidential to You, your employer, or any third party, (ii) Personal Data or individually identifiable health information, (iii) any information that is U. Note: The Damping Factor value is dependent on the active unit system and may influence the results if unit systems are changed. The damping factors are then recalculated in the substep following the remeshing substep. The damping force is directly proportional to the damping ratio specified by the user (default =1). Contact between the spring and the blocks is stabilized by adding contact damping with default damping coefficients as shown by the following KEYOPT and RMODIF commands: Gets the Stabilization Damping Factor at a given solution step. If the energy-based stabilization-control method is used, the damping factor is recalculated automatically at the start of a new load step. 0 by default for Bonded and No Separation behaviors. An example is shown below. I tried to adjust different parameters of the contact: normal stiffness factor (0. 0作为稳定性阻尼 Sep 10, 2019 · This webinar walks through how to leverage stabilization ANSYS Mechanical models to help overcome convergence challenges that result from unstable points in Stabilization Damping Factor项为稳定阻尼系数，默认值为0。 Pinball Region选项为球形区域，用户可以设置为程序控制（Program Controlled）、自动侦测数值（Auto Detection Value）和定义球形区域半径（Radius）。 Deactivate stabilization. This is not a physical force, but a numerical one. 2 non-physical behavior: larger second bounce. For local buckling, the energy method is the only option. The damping factor is mesh-, material-, and time-step-dependent; an initial reference value from the previous run (such as a run with the energy-dissipation ratio as input) should suggest itself. 0 by default for all other behaviors. 教学辅导及咨询V:krrrris_CFD，相关视频：如何基于ANSYS进行进行屈曲分析计算(详细的理论讲解+实操），一个视频理解Abaqus的单位设置，（理论+实操）理解Ansys中的Force和Pressure的区别，（理论+实操）一个视频理解随机振动及功率谱密度，(详细教程)基于Abaqus的搅拌 Apr 17, 2020 · Even if you don't include any nonlinear stabilization damping, a tiny bit of artificial damping in the separation-distance based debonding may be necessary to converge. This contact damping factor is applied in the contact normal direction and it is valid only for the Frictionless , Rough , and Frictional options of the Type property. Don't use a contact normal stiffness factor larger than 1, for a flimsy container, it better be between 0. Jul 28, 2023 · Stabilization Damping Factor项为稳定阻尼系数，默认值为0。 Pinball Region选项为球形区域，用户可以设置为程序控制（Program Controlled）、自动侦测数值（Auto Detection Value）和定义球形区域半径（Radius）。 Sep 15, 2017 · 2 © 2016 ANSYS, Inc. Try a nonzero factor for "Stabilization Damping Factor" on the contact: You may want to reduce the joint tolerance with an APDL command to allows less joint "chatter" within that distance. Ansys, Inc. 0) PINB, U pinb: pinball radius Feb 23, 2024 · If it is significant, you must reduce the Stabilization Damping Factor. May 25, 2021 · The Ansys Learning Forum is a public forum. Jan 9, 2021 · 文章浏览阅读5. public virtual void SetStabilizationDampingFactor(uint stepNumber, double value Beta damping and material damping can lead to undesirable results in a nonlinear analysis. Their purpose is similar to weak springs and should be carefully monitored since they add artificial energy. Deactivate stabilization (default). 01,0. The following table compares the program default values with those of the Ansys Workbench product. In this article we will discuss how to use this feature to “stabilize” challengingRead More “Using Contact Stabilization Nov 20, 2019 · ANSYS User Meeting Global Stabilization Damping Procedure • Set Damping Factor/Dissipation Ratio – Default energy dissipation ratio of 1E-4 generally useful – Damping factor has no default value due to being model-specific, caution when using • First substep activation – Only required for models beginning in an unstable state, avoid The damping factor is the value that the Mechanical APDL solver uses to calculate stabilization forces for all subsequent substeps. public virtual void SetStabilizationDampingFactor(uint stepNumber, double value Note: Normal stabilization damping is only applied to the contact element when the current contact status of the contact detection point is near-field. Contact between the spring and the blocks is stabilized by adding contact damping with default damping coefficients as shown by the following KEYOPT and RMODIF commands: An alternative is to employ the Stabilization Damping Factor property. The conclusion you should draw is that the solution is Nov 16, 2021 · 今天我连发两篇文，是不是变得高产了哈哈哈接上文8. These damping coefficients are multiplied by the stiffness matrix, which is constantly changing in a nonlinear analysis. The energy-dissipation ratio (Method = ENERGY) or damping factor (Method = DAMPING). The energy-dissipation ratio or damping factor remains constant during the load step. recommends this option only for experienced users. The damping factor is the value that the ANSYS solver uses to calculate stabilization forces for all subsequent substeps. http://caeshop. The value of the stabilization damping factor should be large enough to prevent rigid body motion but small enough to ensure a In some cases, when the energy-based stabilization-control method is used, recalculating the damping factors (STABILIZE with RECALCDAMP = 1) after remeshing may enable the solution to converge faster. (I set to update Activate stabilization. Stabilization Damping Factor这个选项只有在选择Frictional ,rough,frictionless这三个非线性接触类型时才会出现零件之间的初始状态可能不是完全接触上的，或是积分点之间有一定的距离，计算一开始无法探测到零件之间的接触，可能会产生刚性位移。 Jun 7, 2020 · For your second question, if the energy dissipation ratio is high, the resultant stabilization force is high and hence will result in a stiffer response. This method is not especially easy to use because the analysis type changes, so you must input mass, apply a damping factor if necessary, and use proper time-integration parameters. Beta damping is not applied to the stiffness matrices generated by contact elements. info/41/contact:-adjust-to-touch-and-stabil This method is not especially easy to use because the analysis type changes, so you must input mass, apply a damping factor if necessary, and use proper time-integration parameters. 5. DAMPING - Use the damping factor as the control. Government Classified, Controlled Unclassified Information, International Traffic in Arms Regulators (ITAR) or Export Administration • 稳定性阻尼系数（Stabilization Damping Factor）应用于法向，只对非线性接触有效 （无摩擦、粗糙或摩擦）。 • 如果系数为0（默认），只有在满足前提条件的情况 下，激活阻尼，并且只在第一个载荷步激活。 • 如果该系数大于0，在所有载荷步激活阻尼。 03. public virtual void SetStabilizationDampingFactor(uint stepNumber, double value Sets the Stabilization Damping Factor for a given solution step. 0001 and it Note: Normal stabilization damping is only applied to the contact element when the current contact status of the contact detection point is near-field. Tangential damping can also be applied independent of normal damping for sliding contact. The stabilization damping factor works similar as defining a spring between 2 bodies with a very small stiffness which will hold the bodies together without significantly affecting the Contact stabilization is based on viscous damping opposing incremental relative motion between nearby surfaces, in the same manner as contact damping (see Contact damping). However, in some cases, compon Sep 12, 2018 · This contact damping factor is applied in the contact normal direction and it is valid only for frictionless, rough and frictional contacts. . 2. •As previously discussed, the total damping in a system may come from several sources. Assumes the problem starts stable and applies damping if instabilities arise. 05. public virtual double GetStabilizationDampingFactor(uint stepNumber) Sets the Stabilization Damping Factor for a given solution step. This value must be greater than 0 when Method = ENERGY or Method Stabilization Damping Factor（稳定阻尼系数），默认值为0 Pinball Region（球形区域） （1）Program Controlled(程序控制） （2）Auto Detection Value（自动侦测数值） （3）Radius（定义球形区域半径） Sep 18, 2018 · Hi Jon, Yes Stabilization is like adding dampers to the springs, so it helps contain large displacements for small load increments. Examples If the energy-based stabilization-control method is used, the damping factor is recalculated automatically at the start of a new load step. 001: n/a: 33: FDMD: Jun 9, 2021 · In this case, it is a relatively small change, 3% however, it demonstrates the effect excessive stabilization can have on the results. Don't use a contact damping factor more than 0. This value is greater than 0. Nov 4, 2021 · 当选择手动输入接触刚度时，会出现Normal Stiffness factor 这个框框，输入0. public virtual double GetStabilizationDampingFactor(uint stepNumber) Apr 19, 2017 · These two objects are in frictional contact. When damping is applied, the specified value is used for all elements. therefore recommends trying nonlinear stabilization or the arc-length method first. Examples Gets the Stabilization Damping Factor at a given solution step. The conclusion you should draw is that the solution is Deactivate stabilization (default). You can use these real constants to apply a scaling factor to the internally calculated destabilizing and stabilizing damping or to input the destabilizing and stabilizing squeal damping coefficients directly. 1 as it will bring unrealistic behavior to the model. For global buckling, either the energy or damping method can be used. Undocumented JTOL argument: SOLCONTROL, Key1, Key2, Key3, VTOL, JTOL Where, JTOL is used to specify the tolerance. Numerical Damping Control: (Only available with Implicit Generalized-α time integration. 비선형 문제에서 시작은 Energy 법을 사용하고 이후 해석에서 Damping 법으로 전환하는 방식으로 두 가지 방법을 모두 사용하면 수렴하는데 도움이 됩니다. Note: Normal stabilization damping is only applied to the contact element when the current contact status of the contact detection point is near-field. ) This option allows you to control the noise produced by high frequencies. Apr 25, 2023 · 05. It should also be noted that as stabilization is a damping force and damping energy is dependent on velocity – distance divided by time even applies in a ‘static’ analysis. 01 and 0. July 19, 2017 Why are these best practices important? •Contact is the most common source of nonlinearity and is often the most difficulty to However, when KEYOPT(15) = 3, normal stabilization damping is always applied as long as the current contact status of the contact detection point is near-field. The energy-dissipation ratio or damping factor is reduced linearly to zero at the end of the load step from the specified or calculated Nov 18, 2021 · The Ansys Learning Forum is a public forum. Government Classified, Controlled Unclassified Information, International Traffic in Arms Regulators (ITAR) or Export Administration Gets the Stabilization Damping Factor at a given solution step. Here we focus on two dominant sources: ‐Viscous damping from the suspension shock absorber When damping is applied, the specified value is used for all elements. and its subsidiaries and affiliates. 4. 0； 在结构线性静力学分析中，ANSYS Workbench 提供了多种类型的材料模型，包括线性弹性材料、非线性材料、复合材料等。通过 ANSYS Workbench，可以对结构进行静力学分析，计算结构的应力、应变、位移等结果，并对结构 Sep 6, 2024 · Stabilization Damping Factor即稳定性阻尼因子选项。 这个参数是一种用于收敛的的数值工具（Number Technical），提供一种 阻力来阻止接触表面之间的相对运动 ，防止刚体运动。 （1）默认值是0，仅在 第一个加载步骤中激活阻尼 ； 求解器使用默认值1. FDMN: normal direction stabilisation damping factor (default=1. An alternative is to employ the Stabilization Damping Factor property. FKN=1. The Stabilization Damping Factor is under the Contact Details for Frictional Contact was set to 0. At the structural level, you can specify it as modal damping or Rayleigh damping. The graphs below have various levels of Damping under the Analysis Settings. public virtual double GetStabilizationDampingFactor(uint stepNumber) The damping factor is the value that the Mechanical APDL solver uses to calculate stabilization forces for all subsequent substeps. Release 2024 R2 - © ANSYS, Inc. The Stabilization Damping Factor used in the video was 0. In some cases, it may be advisable to recalculate the damping factor, as the original damping factor may be inadequate. Jul 13, 2023 · 5 (9) INTRODUCTION Contact stabilization damping is a feature associated with non-linear (frictionless, frictional, and rough) contacts in ANSYS. For more information, see Damping in the Structural Analysis Guide. when Key ≠ OFF. 5, it has become possible to have thermal contact conductance across a small gap at a contact pair In this case, if the energy-based stabilization-control method is used and STABILIZE with RECALCDAMP = 1 was issued in the original analysis, the damping factors are recalculated. ALPD and BETD are not assumed to be temperature dependent and are always evaluated at T = 0. Note: The Damping Factor value is dependent on Stabilization Damping Factor 这个选项只有在选择Frictional ,rough,frictionless这三个非线性接触类型时才会出现 零件之间的初始状态可能不是完全接触上的，或是积分点之间有一定的距离，计算一开始无法探测到零件之间的接触，可能会产生刚性位移。 Apr 30, 2023 · 05. The damping is applied to each load step where the contact status is open. Rather than ignoring the gap by offsetting the contact elements, damping is applied and makes the approach of the bodies towards each other less difficult for the solver to handle, leading eventually to closed contact. Feb 15, 2025 · The stabilization-control method: ENERGY - Use the energy-dissipation ratio as the control. 1, because the large out-of-plane force will make it hard to converge. The stabilization damping factor provides a certain resistance to damp the relative motion between the contacting surfaces and prevents rigid body motion. S. REDUCE — Activate stabilization. CONSTANT — Activate stabilization. It is zero by default. Aug 6, 2024 · The stabilization damping factor provides a certain resistance to damp the relative motion between the contacting surfaces and prevents rigid body motion. The energy-dissipation ratio or damping factor is reduced linearly to zero at the end of the load step from the specified or calculated value. Exercise caution when specifying SubStpOpt = MINTIME or ANYTIME for the first load step; Ansys, Inc. You choose a value of 1. Apr 20, 2018 · • Recommended when user has a specific damping factor in mind. Alternatively, you can reissue STABILIZE to modify the stabilization damping factor. Dec 24, 2021 · This is the page in the ANSYS Help system that describes Update Stiffness: Advanced Settings (ansys. Aug 25, 2020 · In engineering simulations, a proper definition of contact is required to accurately model the interaction between two bodies. 03 You can specify the damping at the material level via viscous material models or dashpots (for example, COMBIN14 elements). This may require smaller time stepping. 7 稳定性因子阻尼Stabilization Damping Factor即稳定性阻尼因子选项。 Gets the Stabilization Damping Factor at a given solution step. Softened contact (0. Damping Factor Based on Dissipated Energy Fraction: This method calculates the damping factor based on the energy dissipated during the first increment of a step. public virtual double GetStabilizationDampingFactor(uint stepNumber) Sep 6, 2024 · ↓降低了刚度，收敛性很好。通过更少的迭代，这种接触分析满足收敛标准。注意：！？是不是又读晕了？！如果对接触算法都不理解，法向刚度定义都不清楚，与其瞎试，还不如一路Program Controlled。3. However, when KEYOPT(15) = 3, normal stabilization damping is always applied as long as the current contact status of the contact detection point is near-field. 0 to clairify this scenario: When Damping is specified, a Damping Factor value needs to be entered. When the applied damping value is too large, too much stabilization force is applied to the structure, so the system is too stiff and converges easily without much deformation. We use these techniques (either energy dissipation factor or damping factor) to add a small numerical force to stabilize the simulation. This section is from the manual: Stabilization Damping Factor ： 接触网格（contact body）与目标网格（target body）存在小间隙，稳定阻尼系数的值应足够大，以防止刚体运动，但又足够小，以确保求解，通常设置为1比较合适。 Ansys Mechanical APDL Default Ansys Workbench Default Tangential stabilization damping factor: 0. Rigid Dynamics Analysis Damping. Stabilization Damping Factor 这个选项只有在选择Frictional ,rough,frictionless这三个非线性接触类型时才会出现 零件之间的初始状态可能不是完全接触上的，或是积分点之间有一定的距离，计算一开始无法探测到零件之间的接触，可能会产生刚性位移。 The following table compares the program default values with those of the Ansys Workbench product. I have never changed the default value. ─FKN=10. Tangential stabilization damping is automatically activated when normal damping is activated. Examples In this analysis, contact stabilization damping is controlled by KEYOPT(15) and real constant FDMT (tangential stabilization damping factor) of the CONTA174 element. Remarks. Stabilization Damping Factor（稳定阻尼系数），默认值为0 Pinball Region（球形区域） （1）Program Controlled(程序控制） （2）Auto Detection Value（自动侦测数值） （3）Radius（定义球形区域半径） Feb 23, 2024 · If it is significant, you must reduce the Stabilization Damping Factor. 1 Normal Stiffness Factor) helps resolve non-convergence because it allows more nodes to share the contact load. Tangential stabilization damping factor: 0. d n: normal direction damping coefficient. For example, the first image I showed uses artificial damping=0 and unable to converge, while the second one only uses artificial damping coefficient in CZM as 0. In this analysis, contact stabilization damping is controlled by KEYOPT(15) and real constant FDMT (tangential stabilization damping factor) of the CONTA174 element. Material-dependent mass and stiffness damping (MP,ALPD and MP,BETD) is an additional method of including damping for dynamic analyses and is useful when different parts of the model have different damping values. Note that stabilization damping factor also helps with Rigid body motion. Damping of a Car Suspension System 2 Car Suspension System •Let’s apply the damping concepts to a simple model car suspension system. 5 Stabilization Damping Factor 稳定阻尼系数 由于接触对单元或接触对积分点之间存在小间隙，导致接触对处于near open状态。分析过程中接触对可能会因此产生刚性体运动。稳定阻尼系数提供一定的阻力来防止接触对之间的刚体运动。接触阻尼系数应用于接触法线 Nov 4, 2021 · 8. 001: n/a: 33: FDMD: Contains proprietary and confidential information of ANSYS, Inc. In this case, if the energy-based stabilization-control method is used and STABILIZE with RECALCDAMP = 1 was issued in the original analysis, the damping factors are recalculated. 1,1), detection method and time step controls. How could I use ALPHAD and BETAD Commands in ANSYS, in case that I can calculate these factors in that way? The buckling type helps to determine which stabilization method to use (damping or energy). It also depends on the displacement over the time of the current substep and the contact pinball radius. It can be accessed under the Advanced contact settings and can be entered as a numerical value. Declaration Syntax. 由于接触对单元或接触对积分点之间存在小间隙，导致接触对处于near open状态。分析过程中接触对可能会因此产生刚性体运动。稳定阻尼系数提供一定的阻力来防止接触对之间的刚体运动。 Apr 16, 2020 · 3. Ansys Workbench工程应用之——结构非线性（下）：状态非线性（3）间隙接触 本作强迫症的态度，9月25日对本文进行了修改，主要补充稳定伪能量验证方法，具体见文中注释[1]、[2]、[3]、[4]、[5]处。 Jun 22, 2024 · In such cases, restarting the analysis with the damping factor from the previous step is recommended. value. May 9, 2023 · Introduction to Adjust to Touch and Stabilization Damping Contact: the different and check results. This value is the default. 01~10区间内的数字定义接触刚度系数。 注意，这个系数不是真实的接触刚度，而是刚度系数，这个系数乘以程序计算出的接触刚度才是真实的接触刚度值。 Jan 20, 2025 · 稳定阻尼系数（ stabilization damping factor ）可以在相互接触的面之间提供一定的阻力并防止刚体运动。稳定阻尼系数（ stabilization damping factor ）加到接触法向并且只对无摩擦接触、粗糙接触和摩擦接触有效。当接触状态是打开状态时，阻尼被施加到每个载荷步。 I tried to adjust different parameters of the contact: normal stiffness factor (0. 001: n/a: 33: FDMD: Destabilizing squeal damping factor: 1: n/a: 34: FDMN = Normal stabilization damping factor; At Ansys version 14. Apr 10, 2019 · Damping factor alpha, α is the constant mass matrix multiplier and beta, β is the constant stiffness matrix multiplier in the damping matrix C in ANSYS for vibration damping. 0 for the Stabilization Damping Factor and made the plot showing stabilization energy was huge compared to the stiffness energy. Feb 27, 2023 · Stabilization Damping Factor = 0. 1,1), stabilization damping factor (0,0. Try "augmented Lagrange formulation" for the contact. Gets the Stabilization Damping Factor at a given solution step. The most common purpose of contact stabilization is to stabilize otherwise unconstrained “rigid body motion” before contact closure and friction restrain such motions. 7k次，点赞3次，收藏16次。本文详细介绍了ANSYS Workbench中体与体之间接触的高级选项，包括Stabilization Damping Factor和Pinball。Stabilization Damping Factor用于避免刚性位移，帮助收敛；Pinball定义了接触探测距离，适用于处理初始缝隙和大变形问题。 Jan 16, 2014 · Element Damping. Spring damping and Bearing damping are defined in the Details view of the Spring object and Bearing object. Contact between the spring and the blocks is stabilized by adding contact damping with default damping coefficients as shown by the following KEYOPT and RMODIF commands: Sep 13, 2023 · Normal Stiffness is actually a factor (known as FKN) on the code calculated stiffness explained earlier. When KEYOPT(15) = 0, 1, or 2, normal stabilization damping is not applied in the current substep if any contact detection point has a closed status. Mar 17, 2023 · The following statement has been added at 15. In my calculation, I always have the problem of convergence at the moment when the spring pass the top of a gear tooth. 5 Stabilization Damping Factor 稳定阻尼系数. All rights reserved. Structural damping is not applicable to joint elements. knkdcn tazzz octq xuul sobtw xzgor nwjcm iap uyqw maannxl nvrts gycco shhve qojnytplz hkfl