https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/en-USTelligent Community 13https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74707/powerflow-and-duty-cycle-generationMon, 05 Oct 2026 02:15:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:3914398f-8a2f-4350-a185-98a216b83f10Mohit ParmarWhy does "Powerflows in file(s) do not exactly match powerflows in duty cycle" error occur? (This Q&A has been posted by Romax Technical Support team for the benefit of our community members)https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74707/powerflow-and-duty-cycle-generation/1434939Mon, 05 Oct 2026 02:15:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:ede1847e-4612-41a3-8aa7-3e4c7dc678dfMohit ParmarWhen generating loadcases from recorded data in Romax DT, users may encounter the error "Powerflows in file(s) do not exactly match powerflows in duty cycle." Refer to the description below to know more about the cause of this error and how to get around it. The error "Powerflows in file(s) do not exactly match powerflows in duty cycle" usually happens if the loadcase selected as a template has different loadcase names when compared to the powerflow names from the imported csv file. Correct mapping process is explained with the help of an example below, observe loadcase name "1", for this "Wheel 3 - Gear-Clutch" is engaged: csv file that would be imported: The powerflow numbers in the excel (.csv) file are mapped to the respective name of the loadcase and therefore to the clutch engaged for that loadcase. On generating loadcases from recorded data, you can now observe all the powerflows with "1" (1 Load case [no.]) in the csv file are mapped to "Wheel 3 - Gear-Clutch":https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74704/romax-safenet-licensing-and-aws/1434927Wed, 30 Sep 2026 08:15:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:18c7eafa-a1ad-4c7d-8127-8e4557d3bee6Mohit ParmarThis post would be talking about some of the doubts users might have while setting up Romax SafeNet license on AWS (Amazon Web Services). Setting up Romax SafeNet license on AWS (Amazon Web Services) should work, we do not expect there to be any issues or limitations. To lock SafeNet license file we normally use - Disk ID and Ethernet Address. These should be alright for a locking code for AWS. To know more on any special contract requirements, we would recommend reaching out to someone on the commercial side.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74704/romax-safenet-licensing-and-awsWed, 30 Sep 2026 08:14:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:caaa2f5c-26b8-4d98-8e26-d09eecdb40f9Mohit ParmarCan I set up Romax SafeNet licensing with Amazon Web Services (AWS)? (This Q&A has been posted by Romax Technical Support team for the benefit of our community members)https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romaxTue, 29 Sep 2026 14:43:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:993527f8-b1eb-4fe2-93a1-6e05fe3c0933https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/Tue, 29 Sep 2026 14:43:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:6a33a304-2379-4114-8bb4-241a9fef5652https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74333/bearing-internal-clearance/1432831Fri, 04 Sep 2026 03:46:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:a55a59d4-93e1-47bb-a6a1-d564f1803d78Pandurang NaikThe surface roughness of the shaft and housing bore does not directly influence the preload or clearance of the bearing. However, Romax provides a feature to calculate press fit based on the DIN7190 standard, which takes into account the surface roughness of the shaft, housing bore, and the bearing’s inner and outer raceways when determining the press fit. Changes in surface roughness will alter the effective interference or press fit. Users can apply this effective interference as their press fit value. Ultimately, the press fit is a key factor in calculating the bearing’s internal clearance. Note- it should be noted that the surface roughness is defined as part of the Interface definition, rather than using the more general material definitions for the componentshttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74333/bearing-internal-clearanceFri, 04 Sep 2026 03:45:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:5a8ca0a3-28e8-4fdd-a79a-940908ee65b3Pandurang NaikCan we consider shaft/housing roughness in the calculation of internal clearance of bearing? (This Q&A has been posted by Cadence Technical Support for the benefit of our community members)https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74320/a-harmonic-response-problem-considering-gyroscopic-effect-in-romax-software/1432816Sun, 16 Aug 2026 23:04:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:69064ae0-c6e5-479b-86e7-03158568e096Qiang WuDear Bakshi, Thank you very much for your detailed reply. I have mastered the software operation of single-shaft analysis in Romax, using either the Single Shaft Analysis module or the General Dynamic Analysis module. A new disc modeling problem I am addressing is as follows: Fig. 1 three kinds of discs There are three kinds of discs: one type is a keyed disc, which is connected with a shaft by clearance fit, as shown in Fig. 1a; another type is a disc connected with shaft by interference fit, as shown in Fig. 1b; the last type is the integrated shaft-disc. For the integrated shaft-disc, the disc can be modelled by a short beam element. For the keyed disc and the interference-fit disc, how should each type be modeled in Romax software, respectively? Which of the two disc types mentioned above corresponds to the dynamical disc module in Romax, as shown in Fig. 2? Fig.2 the mass module Thank you very much for taking time out of your busy schedule to look into our questions！https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74323/gears/1432802Tue, 04 Aug 2026 03:49:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:c5176357-aae8-4254-8ff5-2561d84e1fefPandurang NaikThe film thickness in the ISO/TR 15144 model is influenced by several factors, even if the formula does not explicitly include surface roughness "Ra". The roughness factor affects the mean coefficient of friction, which in turn impacts the contact temperature θB,Y. Changes in contact temperature affect various parameters in the equation, such as the oil viscosity and pressure-viscosity coefficient. These parameters are part of the material parameter (Gm), local velocity parameter (Uy), and sliding parameter (Sgfy) in Equation (4). As these parameters vary with temperature, the calculated oil film thickness changes as a result. Please see ISO 15144 section 12 to 14 for more detailed explanation.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74323/gearsTue, 04 Aug 2026 03:48:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:37d9c631-9022-48fa-a7b5-9cbe4f6081ebPandurang NaikWhy does the film thickness result change when the surface roughness "Ra" is altered in the ISO/TR 15144 model, even though the formula (4) does not explicitly include "Ra"? (This Q&A has been posted by Cadence Technical Support for the benefit of our community members)https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74320/a-harmonic-response-problem-considering-gyroscopic-effect-in-romax-software/1432797Fri, 31 Jul 2026 01:54:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:791bbfa3-bc3b-453a-a000-c48e4cc963fbVaishali BakshiHello Qiang Wu, Thank you for contacting us! I believe you are looking for single shaft dynamic analysis. Romax Spectrum provides below analysis options for achieving the same. If you need more information on them, kindly reach out the support portal.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74320/a-harmonic-response-problem-considering-gyroscopic-effect-in-romax-softwareWed, 29 Jul 2026 22:24:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:7ae41850-45bf-4db6-9bcb-9575ac11064bQiang WuDear Experts on Romax Software, I have recently modeled a single shaft with two rigid connections, two discs and two dynamic unbalanced loads, as shown below: The corresponding harmonic response computation yields both frequency response curves and the corresponding resonance peaks. When I ran the same simulation in a rotordynamics software from the Professor Friswell M.I (《Dynamics of rotating machines》), I found that the resonance peak amplitude of Romax is essentially the same as the result from Friswell software when the gyroscopic effect of the dynamic discs is not considered , rather than when it is taken into account. How is the gyroscopic effect of a dynamic rotor disc configured in Romax? How is the gyroscopic effect of a shaft configured in Romax? Thank you very much for taking the time to read my question!gyroscopic effectDynamic Analysishttps://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74318/shaft-nodesMon, 27 Jul 2026 22:13:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:9584c091-85ec-4df7-80da-120fab0f0df7Vaishali BakshiHow Nodes are Generated on Shafts in RomaxDT? (This Q&A has been posted by Cadence Technical Support for the benefit of our community members)https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74318/shaft-nodes/1432792Mon, 27 Jul 2026 22:13:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:0b63906f-da44-49f3-9021-e86c69d8e78dVaishali BakshiWhen components such as bearings are placed, nodes are created accordingly. However, additional nodes are automatically generated along the shaft. Node generation along a shaft is governed by the Timoshenko beam theory, which requires dividing long shaft sections for accurate static analysis. The 'Max length to diameter ratio for parallel section' setting (under Analysis settings) controls how many nodes are created. Lowering this ratio increases node count, while raising it decreases nodes. Disabling this setting stops extra node generation, but keeping it enabled is recommended for accuracy.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74309/safety-factorTue, 14 Jul 2026 05:01:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:5838347b-1196-49bd-9f8b-cf34a258c4a4Pandurang NaikWhat is the difference between duty cycle safety factor and load case safety factor of a gear? (This Q&A has been posted by Cadence Technical Support for the benefit of our community members)https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74309/safety-factor/1432772Tue, 14 Jul 2026 05:01:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:91f8f885-9fc1-4fcd-b84a-561b0b8c150ePandurang NaikLoad case safety factor is calculated by considering permissible (allowable) stress and actual stress. Load case safety factor is = Permissible stress / Actual stress. Duty cycle safety factor is calculated by iterative method. Romax ensures that the total damage from all load cases equals 100% by applying an iterative method that uses a scaling factor. This scaling factor is referred to as the duty cycle safety factor. Please refer ISO 6336-6 section 5.4. If the combined damage from all load cases exceeds 100%, Romax applies a scaling factor less than 1 to reduce the total damage to exactly 100%. The specific scaling factor at which the sum of damages equals 100% is defined as the duty cycle safety factor.https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74307/mean-finished-profile-shift-for-splines/1432768Fri, 10 Jul 2026 07:30:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:613e8137-90d1-407e-a0dc-04d8f2e0a610Mohit ParmarThe "Mean finished profile shift" is given in units of " mm ", it is due to - Mean finished profile shift = profile shift coefficient × normal module Spline Coupling Properties > Design tab > "Mean finished profile shift:":https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74307/mean-finished-profile-shift-for-splinesFri, 10 Jul 2026 07:28:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:8cbc69cc-24b5-42d7-8048-c5c5e4c4f02aMohit ParmarWhat is the mean finished profile shift for splines? (This Q&A has been posted by Romax Technical Support team for the benefit of our community members)https://community.cadence.com/cadence_technology_forums/physical-system-simulation/romax/f/romax/74306/effect-of-planet-pin-interference-fit-on-tooth-load-distribution/1432766Thu, 09 Jul 2026 20:38:00 GMT75bcbcf9-38a3-4e2e-b84b-26c8c46a9500:7b2f4e1c-6a33-40a7-b3e5-e878e3a99b2eshuang muThank you for taking the time to reply. I appreciate your help, and I will try this approach next.