[{"data":1,"prerenderedAt":112},["ShallowReactive",2],{"vosgPFyQgH94uUDeXKrqikv5MJbJamiNMIO5ie8c0RU":3,"article_aircraft-engine-mount-frequency-vibration-testing_solidworks":10,"_apollo:default":110,"_apollo:identified":111},{"mailchimpAudience":4},{"actionUrl":5,"slug":6,"locale":7,"default":8,"__typename":9},"","aircraft-engine-mount-frequency-vibration-testing","en","https:\u002F\u002F3ds.us3.list-manage.com\u002Fsubscribe\u002Fpost?u=ed4601044e1936748c0d2aa6b&id=e5080ff9fe&f_id=002d4de2f0","MailchimpAudience",{"posts":11},{"nodes":12,"__typename":109},[13],{"id":14,"slug":6,"title":15,"uri":16,"excerpt":17,"locale":18,"featuredImage":21,"tableOfContents":29,"content":30,"date":31,"authorJobTitle":5,"author":32,"masterings":43,"globalTags":47,"products":66,"disciplines":80,"seo":98,"__typename":108},"cG9zdDoxMDE0MQ==","Aircraft Engine Mount – Frequency\u002FVibration Testing","\u002Fproducts\u002Fsolidworks\u002Faircraft-engine-mount-frequency-vibration-testing","\u003Cp>The intention of this article is to describe a portion of the…\u003C\u002Fp>\n",{"locale":19,"__typename":20},"en_US","Locale",{"node":22,"__typename":28},{"large":23,"__typename":24,"medium_large":23,"thumbnail":25,"srcSet":26,"sizes":27},"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-11_11-53-47-2.png.webp","MediaItem","https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-11_11-53-47-2-150x150.png.webp","https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-11_11-53-47-2.png.webp 429w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-11_11-53-47-2-300x173.png.webp 300w","(max-width: 429px) 100vw, 429px","NodeWithFeaturedImageToMediaItemConnectionEdge",[],"\u003Cp>The intention of this article is to describe a portion of the process required to engineer a frame and engine mounting system for a single engine aircraft.\u003C\u002Fp>\u003Cfigure class=\"wp-block-image size-large\">\u003Cimg loading=\"lazy\" decoding=\"async\" width=\"615\" height=\"304\" src=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-11_11-51-37-615x304-1.png.webp\" alt=\"\" class=\"wp-image-10143\" srcset=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-11_11-51-37-615x304-1.png.webp 615w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-11_11-51-37-615x304-1-300x148.png.webp 300w\" sizes=\"auto, (max-width: 615px) 100vw, 615px\" \u002F>\u003C\u002Ffigure>\u003Cp>Figure 1: Many Design Options are available. For example, the above image depicts two options for mounting to the firewall.\u003C\u002Fp>\u003Cp>The mounting system is the primary interface between the powertrain and the frame. Therefore, it is vital to determine the vibration isolation characteristics. Many mounts are available to isolate these frequencies. However, for this project, my client chose an elastomeric mount. This is primarily a rubber mount that can withstand large amounts of deformation under load with the ability to almost retain its original shape when the load is removed. Rubber is a viscoelastic material which enables it to be used as an isolator and as a damper with excellent results. Rubber engine mounts can be implemented through a passive system, or an active system with a control loop adjusting stiffness based on sensor input to the computer. Many times, these are used in conjunction with one another to provide design redundancy.\u003C\u002Fp>\u003Cp>Requirements:\u003C\u002Fp>\u003Col class=\"wp-block-list\">\n\u003Cli>Determine force isolation, often encountered in rotating or reciprocating machinery with unbalanced masses.\u003C\u002Fli>\n\u003Cli>Determine motion isolation……minimize the transmitted vibration amplitude so the mounted equipment is shielded from vibrations coming from the supporting structure.\u003C\u002Fli>\n\u003Cli>Ensure the natural frequency of the air-frame and support equipment is lower than that produced by the power plant.\u003C\u002Fli>\n\u003C\u002Fol>\u003Cp>Goal: \u003C\u002Fp>\u003Cp>Achieve low vibration transmission to the airplane structure and occupants.\u003C\u002Fp>\u003Cp>Mechanical System Considerations:\u003C\u002Fp>\u003Cp>As engineers, we are constantly weighting out design options. For this challenge, mount stiffness must be as low as possible. However, this causes increased static deflection. Also, handling and maneuverability are enhanced with higher stiffness, lower dampened engine mounts.\u003C\u002Fp>\u003Cfigure class=\"wp-block-image size-large\">\u003Cimg loading=\"lazy\" decoding=\"async\" width=\"354\" height=\"263\" src=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-19-08.png.webp\" alt=\"\" class=\"wp-image-10144\" srcset=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-19-08.png.webp 354w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-19-08-300x223.png.webp 300w\" sizes=\"auto, (max-width: 354px) 100vw, 354px\" \u002F>\u003C\u002Ffigure>\u003Cp>Figure 2: Mech Model for Elastomeric Engine Mounts\u003C\u002Fp>\u003Cp>Modeling Setup:\u003C\u002Fp>\u003Cp>Six DOF to be excited due to inertial forces and torque produced by the main crankshaft.\u003C\u002Fp>\u003Cfigure class=\"wp-block-image size-large\">\u003Cimg loading=\"lazy\" decoding=\"async\" width=\"429\" height=\"248\" src=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-11_11-53-47.png.webp\" alt=\"\" class=\"wp-image-10145\" srcset=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-11_11-53-47.png.webp 429w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-11_11-53-47-300x173.png.webp 300w\" sizes=\"auto, (max-width: 429px) 100vw, 429px\" \u002F>\u003C\u002Ffigure>\u003Cp>Figure 3: Engine 6 DOF\u003C\u002Fp>\u003Cfigure class=\"wp-block-image size-large\">\u003Cimg loading=\"lazy\" decoding=\"async\" width=\"305\" height=\"216\" src=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-32-34.png.webp\" alt=\"\" class=\"wp-image-10146\" srcset=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-32-34.png.webp 305w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-32-34-300x212.png.webp 300w\" sizes=\"auto, (max-width: 305px) 100vw, 305px\" \u002F>\u003C\u002Ffigure>\u003Cp>Figure 4: Spring dampener on each axis\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Cp>Supporting Theory:\u003C\u002Fp>\u003Cp> Utilizing Voigt’s & Maxwell’s Model we can accurately depict the system.\u003C\u002Fp>\u003Col class=\"wp-block-list\">\n\u003Cli>The model consists of a single degree of freedom system where the spring and damper are represented by the stiffness ??1 and damping coefficient ??1 (See figure 4). The snubbing effect is considered by adding an additional two linear springs ??2 and ??3 that will be engaged when the displacement amplitude ?? of the isolated mass exceeds the snubbing gap ???? (See figure 5).\u003C\u002Fli>\n\u003C\u002Fol>\u003Cp>2. The equations of motion for the model are as follows:\u003C\u002Fp>\u003Cfigure class=\"wp-block-image size-large\">\u003Cimg loading=\"lazy\" decoding=\"async\" width=\"414\" height=\"114\" src=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-39-02.png.webp\" alt=\"\" class=\"wp-image-10147\" srcset=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-39-02.png.webp 414w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-39-02-300x83.png.webp 300w\" sizes=\"auto, (max-width: 414px) 100vw, 414px\" \u002F>\u003C\u002Ffigure>\u003Cp>?? represents the mass of the isolated system and ?? is the excitation force acting on the system.\u003C\u002Fp>\u003Cp>3. Completed Voight\u002FMaxwell Model:\u003C\u002Fp>\u003Cfigure class=\"wp-block-image size-large\">\u003Cimg loading=\"lazy\" decoding=\"async\" width=\"493\" height=\"391\" src=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-40-07.png.webp\" alt=\"\" class=\"wp-image-10148\" srcset=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-40-07.png.webp 493w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-40-07-300x238.png.webp 300w\" sizes=\"auto, (max-width: 493px) 100vw, 493px\" \u002F>\u003C\u002Ffigure>\u003Cp>Figure 5: Voight model-Minus Snubbing effect damping.\u003C\u002Fp>\u003Cfigure class=\"wp-block-image size-large\">\u003Cimg loading=\"lazy\" decoding=\"async\" width=\"535\" height=\"411\" src=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-41-35.png.webp\" alt=\"\" class=\"wp-image-10149\" srcset=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-41-35.png.webp 535w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_10-41-35-300x230.png.webp 300w\" sizes=\"auto, (max-width: 535px) 100vw, 535px\" \u002F>\u003C\u002Ffigure>\u003Cp>Figure 5: Maxwell-Voight Model with Snubbing effect\u003C\u002Fp>\u003Cp>Additional Considerations:\u003C\u002Fp>\u003Cp>The ol’ adage “garbage in, garbage out” certainly applies to this case study. Capturing and defining accurate load conditions can prove to be the biggest challenge of all, as is the case of many simulation studies (See figure 6).  The load cases are extremely dynamic on an airplane. Through each phase of flight (Taxi, Takeoff, Cruise, Landing), conditions are constantly being modified. Then there’s environmental considerations. Analogous to an unbalanced spinning wheel, g-loading in “chop” (turbulence) can create conditions known as “Whirl Mode”, in which the application of a gyroscopic moment to the powerplant provides an excitation of a bending resonant frequency of the powerplant \u002F mount system.\u003C\u002Fp>\u003Cfigure class=\"wp-block-image size-large\">\u003Cimg loading=\"lazy\" decoding=\"async\" width=\"590\" height=\"598\" src=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-11_11-52-21.png.webp\" alt=\"\" class=\"wp-image-10150\" srcset=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-11_11-52-21.png.webp 590w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-11_11-52-21-296x300.png.webp 296w\" sizes=\"auto, (max-width: 590px) 100vw, 590px\" \u002F>\u003C\u002Ffigure>\u003Cp>Figure 6: Load case during touchdown\u003C\u002Fp>\u003Cp> To properly model this will require multiple studies using several specific FEA studies. For this article, I chose the most common engineering requirement…\u003Cem>Natural Frequency Analysis\u003C\u002Fem>.\u003C\u002Fp>\u003Cp>Static Modal Results\u002FSetup: (Figures 7,8,9,10,11)\u003C\u002Fp>\u003Cp>-Study Type:\u003C\u002Fp>\u003Cp>\u003Cem>Natural Frequency response study.\u003C\u002Fem>\u003C\u002Fp>\u003Cp>-Excitation Frequency\u003C\u002Fp>\u003Cp>\u003Cem>Engine at idle RPM’s\u003C\u002Fem>\u003C\u002Fp>\u003Cp>-Load Case\u003C\u002Fp>\u003Cp>\u003Cem>Standard g-loading acceleration applied.\u003C\u002Fem>\u003C\u002Fp>\u003Cp>-Software\u003C\u002Fp>\u003Cp>\u003Cem>SOLIDWORKS Premium and Simulation Professional.\u003C\u002Fem>\u003C\u002Fp>\u003Cfigure class=\"wp-block-image size-large\">\u003Cimg loading=\"lazy\" decoding=\"async\" width=\"236\" height=\"362\" src=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_12-13-08.png\" alt=\"\" class=\"wp-image-10151\" srcset=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_12-13-08.png 236w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_12-13-08-196x300.png 196w\" sizes=\"auto, (max-width: 236px) 100vw, 236px\" \u002F>\u003C\u002Ffigure>\u003Cp>Figure 7: Study Setup\u003C\u002Fp>\u003Cfigure class=\"wp-block-image size-large\">\u003Cimg loading=\"lazy\" decoding=\"async\" width=\"545\" height=\"281\" src=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-19_13-22-31.png\" alt=\"\" class=\"wp-image-10152\" srcset=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-19_13-22-31.png 545w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-19_13-22-31-300x155.png 300w\" sizes=\"auto, (max-width: 545px) 100vw, 545px\" \u002F>\u003C\u002Ffigure>\u003Cp>Figure 8: Confirm Mass Participation- Use this to qualify results.\u003C\u002Fp>\u003Cp>May require many modes. 80% mass participation if optimal.\u003C\u002Fp>\u003Cfigure class=\"wp-block-image size-large\">\u003Cimg loading=\"lazy\" decoding=\"async\" width=\"615\" height=\"308\" src=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_12-13-24-615x308-1.png.webp\" alt=\"\" class=\"wp-image-10153\" srcset=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_12-13-24-615x308-1.png.webp 615w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_12-13-24-615x308-1-300x150.png.webp 300w\" sizes=\"auto, (max-width: 615px) 100vw, 615px\" \u002F>\u003C\u002Ffigure>\u003Cp>Figure 9: SOLIDWORKS Mode Compare-Helps identify Axis of oscillation.\u003C\u002Fp>\u003Cfigure class=\"wp-block-image size-large\">\u003Cimg loading=\"lazy\" decoding=\"async\" width=\"528\" height=\"294\" src=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_12-14-58.png.webp\" alt=\"\" class=\"wp-image-10154\" srcset=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_12-14-58.png.webp 528w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_12-14-58-300x167.png.webp 300w\" sizes=\"auto, (max-width: 528px) 100vw, 528px\" \u002F>\u003C\u002Ffigure>\u003Cp>Figure 10: List Modes to identify Natural Freq- 427.63htz was my first natural frequency.\u003C\u002Fp>\u003Cfigure class=\"wp-block-image size-large\">\u003Cimg loading=\"lazy\" decoding=\"async\" width=\"615\" height=\"332\" src=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_12-11-43-615x332-1.png.webp\" alt=\"\" class=\"wp-image-10155\" srcset=\"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_12-11-43-615x332-1.png.webp 615w, https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F02\u002F2018-09-13_12-11-43-615x332-1-300x162.png.webp 300w\" sizes=\"auto, (max-width: 615px) 100vw, 615px\" \u002F>\u003C\u002Ffigure>\u003Cp>Figure 11: Mode Compare Visual\u003C\u002Fp>\u003Cp>In conclusion, SOLIDWORKS Simulation was able to successfully replicate multiple load cases, similar to different conditions the aircraft is likely to receive on a normal flight. My client was also able to capture natural frequency modes, and adjust geometry, or materials accordingly to avoid these ranges of frequencies.\u003C\u002Fp>\u003Chr class=\"wp-block-separator\">\u003Cp>\u003Cem>By: Rob Stoklosa • SOLIDWORKS Application Engineer • TPM\u003C\u002Fem>\u003C\u002Fp>","2018-10-24T10:00:56",{"node":33,"__typename":42},{"nicename":34,"description":35,"slug":36,"name":37,"firstName":5,"lastName":5,"avatar":38,"__typename":41},"mstaples","TPM, Inc. is the Carolina’s largest 3D CAD provider and a leading technology company proud of its reputation of providing cutting-edge solutions to the engineering and design community for the past 40 years.  Founded in 1973, TPM Inc. serves more than 3,000 customers across the Southeast each year. Inspired by our founder, Jerry Cooper, we are committed to offering our clients the best: 3D Design Software, 3D Printing and Scanning Options, Data and Document Management Solutions, Large-Format Graphics, Wide-Format Plotters and Office Equipment, and Reprographics.","lwilson","TPM",{"url":39,"__typename":40},"https:\u002F\u002Fblog-assets.solidworks.com\u002Fuploads\u002F2025\u002F12\u002Ftpm-blog-thumb-shaded1.jpg.webp","Avatar","User","NodeWithAuthorToUserConnectionEdge",{"nodes":44,"edges":45,"__typename":46},[],[],"PostToTaxonomy_masteringConnection",{"nodes":48,"__typename":65},[49,55,60],{"id":50,"name":51,"slug":52,"uri":53,"__typename":54},"dGVybTo5NjAx","3D CAD","3d-cad","\u002Ftags\u002F3d-cad\u002F","Taxonomy_tag",{"id":56,"name":57,"slug":58,"uri":59,"__typename":54},"dGVybTo5NjI4","3D Modeling","3d-modeling","\u002Ftags\u002F3d-modeling\u002F",{"id":61,"name":62,"slug":63,"uri":64,"__typename":54},"dGVybTo5NjA3","Simulation","simulation","\u002Ftags\u002Fsimulation\u002F","PostToTaxonomy_tagConnection",{"edges":67,"nodes":77,"__typename":79},[68],{"isPrimary":69,"node":70,"__typename":76},false,{"id":71,"name":72,"slug":73,"uri":74,"__typename":75},"dGVybTo1Ng==","SOLIDWORKS","solidworks","\u002Fproducts\u002Fsolidworks\u002F","Taxonomy_product","PostToTaxonomy_productConnectionEdge",[78],{"id":71,"name":72,"slug":73,"uri":74,"__typename":75},"PostToTaxonomy_productConnection",{"nodes":81,"edges":93,"__typename":97},[82],{"id":83,"name":62,"slug":63,"uri":84,"parentId":85,"disciplines":86,"__typename":92},"dGVybTo4NQ==","\u002Fdisciplines\u002Fsimulation\u002F",null,{"nodes":87,"__typename":91},[88],{"title":62,"uri":89,"parentId":85,"__typename":90},"\u002Fdisciplines\u002Fsimulation","Discipline","Taxonomy_disciplineToDisciplineConnection","Taxonomy_discipline",[94],{"isPrimary":69,"node":95,"__typename":96},{"parentId":85,"id":83,"name":62,"slug":63,"uri":84,"__typename":92},"PostToTaxonomy_disciplineConnectionEdge","PostToTaxonomy_disciplineConnection",{"canonical":5,"title":99,"metaDesc":5,"opengraphAuthor":5,"opengraphDescription":100,"opengraphTitle":15,"opengraphUrl":101,"opengraphSiteName":102,"opengraphPublishedTime":103,"opengraphModifiedTime":104,"twitterTitle":5,"twitterDescription":5,"readingTime":105,"metaRobotsNoindex":106,"__typename":107},"Aircraft Engine Mount – Frequency\u002FVibration Testing - Blog Solidworks","The intention of this article is to describe a portion of the…","\u002Fproducts\u002Fsolidworks\u002Faircraft-engine-mount-frequency-vibration-testing\u002F","Blog Solidworks","2018-10-24T14:00:56+00:00","2025-02-11T06:02:04+00:00",3,"noindex","PostTypeSEO","Post","RootQueryToPostConnection",{},{},1776256788591]