Consult solidworkss entire streamlining design with realworld. Create graphs of the resonant frequencies versus the mass participation factors. Mass participation factor is indicative of how much of the structures mass is taking part in a certain vibration mode. Vibration analysis with solidworks simulation 2017. Dynamic structural design of offshore directdrive wind. No boundary condition, no fixtures i need it in a free environment. With this square millimeter to square meter converter you can convert the mm2 into m2. You are right in your appreciation of the unrestrained model and how it correlates to rigid body modes which have a mass participation. Goengineer delivers software, technology and expertise that enable. To list contact or friction forces, rightclick results and select list result force. There have been many updates to the leading 2d software package, including the phaseout of the free version and the transition into draftsight standard.
Jul 02, 2015 in solidworks simulation 2015, there were three additional frequency plot options added that are beneficial to conveying your natural frequency analysis results. In most software simulation tools, you can find this response before doing the. As you can see, the solidworks simulation optimization tool gives you real time data to help you find the optimum weight settings for a design, minimizing production costs without sacrificing quality. Define damping modal or rayleigh, check sw help for recommendations example. Practical testing shaker bed testusing an impact hammer 2. Negative mass participation factor transient1 mechanical op 30 may 07 14.
Apr 02, 2015 go to tools mass properties or click at the mass properties icon. When you click override mass properties, the new override mass properties dialog box appears. The software discussed in this document is furnished under a license and may be used or copied only in accordance with the terms of the license. The software defines a remote mass at the engines center of gravity cg and connects it to the highlighted faces with rigid bars. With solidworks simulation 20, you can use the material.
Solidworks services solidworks consulting solidworks implementation solidworks. All warranties given by ds solidworks as to the software. Although solidworks optimization does not does not do freeform shape change, design insight hints at where material may be removed. With your help i know now a little bit more about modal mass and participation factors. An overview of solidworks and its associated analysis programs prepared by prof. How to measure a surface area, volume or mass in solidworks. Reduce product weight with solidworks simulation optimization. In several studies llately i am having a hard time getting to the 0. The universally accepted level of mass participation for a linear dynamic study is 0.
The prescribed curve goes up to a maximum of 500 hz. Shape improvement of a gearbox housing using modal analysis. Aug 23, 2016 learn how to get the cumulative mass participation factor using a frequency analysis in solidworks simulation. Mass participation factor when you want to perform a linear dynamic problem small displacement analysis with linear elastic materials, the technique used in solidworks simulation is. Understanding mass participation factor results in. Definition of modal participation factor typical modal equation.
Solidworks simulation software offers three unique packages simulation standard, simulation professional, and simulation premium. Nov 21, 2019 when conducting a frequency or linear dynamics study in solidworks simulation, a highly recommended, bestpractice post processing technique is to investigate both the effective mass participation factor empf and the cumulative effective mass participation factor cempf of the output mode shapes. The eigrl card is just a way to enter the parameters for the modal analysis, which are in general. Mass participation factor and its role in modal anlysis. Those plots, or frequency response graphs, are mode number, effective mass participation factor empf and cumulative effective mass participation factor. Solidworks simulation premium dynamics course this course is targeted for the users who would like to become productive in analyzing structures subjected to various types of. One useful check is to plot the mass participation factors. Example of how to use the mass participation factor in. The rigid bars transfer the weight of the engine to the frame. With this simple model we will apply all four kinds of linear dynamic techniques. Topic 6 structural dynamics iii analysis of elastic mdof systems. Down towards the bottom of the design tree, click on mass participation factor.
Rightclick results and click list resonant frequencies or list mass participation. Mass participation normalized 2018 solidworks help. Pdf study on the simulation of an alloy steel ultrasonic. All warranties given by ds solidworks as to the software and documentation are set forth in the license. Note that milstd1540c and milstd810e require this format for. Controlling software costs is a major concern for all companies. Modal analysis or natural frequency analysis is usually carried out for complex structures by 2 means 1. Understanding mass participation factor results in frequency studies. A mode with large effective mass is typically a substantial contributor to the dynamic system response and must be avoided or passed as quickly as possible. Designed for users who would like to become productive fast, the advanced course offers handson experience on the use of the solidworks simulation dynamics module included with solidworks simulation premium. Another is that a cumulative mass participation factor of 0. You need to assess whether any mdoes in the directions you are low on are even relevant. In the past, many people have asked me if you could optimize a part by using material as a variable. Linear dynamics four methods worth knowing the solidapps blog.
Jan 24, 20 the assigned mass properties option has been replaced by the override mass properties button. I wanted something like a get function for automatically reading the modal mass. I presented the results that you can obtain using that software. We can also define a rigid body mass m r in a similar way to a generalized mass. We can also define a rigid body mass m r in a similar way to a generalized mass as but so md tm. Designed for users who would like to become productive fast, the advanced course offers handson experience on the use of the solidworks simulation dynamics module included with solidworks. The engine is treated as a remote mass connected to the highlighted faces. Understanding mass participation factor results in frequency. You can check part mass by assigning part material first, example for this bracket. Each package focuses on different structural analyses such as. In the mass properties box you can find many material properties.
Cosmosworks a design analysis system fully integrated with solidworks. May 29, 2009 by plotting the mass participation you can see just how important each mode is. Solidworks simulation help defines empf as follows. The effective mass participation factor represents the percentage of the system mass. In solidworks simulation 2015, there were three additional frequency plot options added that are beneficial to conveying your natural frequency analysis results. The material covered includes the time dependent analysis force loads as well as motion shock loading examples, harmonic analysis and random vibration analysis milstd810f example is included. Natural frequency analysis computer aided technology.
How many modes should i run in a modal natural frequency. Each package focuses on different structural analyses such as linear, nonlinear static, and dynamic techniques for each stage of the manufacturing process. Those plots, or frequency response graphs, are mode number, effective mass participation factor empf and cumulative effective mass participation factor cempf. The purpose of this report is to explain the shock response spectrum and to give a. Pdf shape improvement of a gearbox housing using modal analysis. The effective mass participation factor represents the percentage of the system mass that participates in a particular mode. It concurrently introduces the reader to vibration analysis and its implementation in solidworks.
But if the first six modes only contribute 60% mass participation, and above 12 th mode also if for mode the mass participation factor is higher should we check with compressor harmonics upto that or not. Study on the simulation of an alloy steel ultrasonic horn using solidworks software. Analysis and design of footbridges for the dubai metro. Accessing the tutorials to start the online tutorials, click help, solidworks tutorials, all solidworks tutorials. Topic 6 structural dynamics iii analysis of elastic mdof. It takes a unique approach by bridging the theory of mechanical vibrations with examples showing the practical implementation of vibration analysis. Modal effective mass fraction versus modal effective mass. The amount of mass is normalized and the retrieved value is known as the effective mass participation factor or empf priestley et al. The solidworks simulation premium dynamics course includes topics for time dependent. Note that milstd1540c and milstd810e require this format for certain shock environments. Check cumulative effective mass participation factor cempf, in general 80% at minimum include frequencies of at least twice max. Solidworks simulation finding mass participation factor. Table 5 lists t he mass participation factors for the original housing and the modified geometry housing. An overview of solidworks and its associated analysis programs.
Solidworks users with an embedded, stateoftheart finite element modeling tool. Units in effective mass vs mode number xy plots by madjerry on. One common rule of thumb is that a mode should be included if it contributes more than 2% of the total mass. How can i view modal participation factor after carrying out. In this article, we looked at the parametric optimization tools in solidworks. You also can check it volume, surface area and center of mass. Dec 14, 2017 this tutorial focuses on the following. Understand the response of a structure over time during and after the application of a load.
The surface area of the squeezer is 40091mm2 as you can see in the orange rectangle. Mass participation ratios are important in determining the adequacy of the calculated modes to solve dynamic problems with base motion. The shock response spectrum is a useful tool for estimating the damage potential of a shock pulse, as well as for test level specification. Originally developed by nasa, nastran is a finite element analysis fea system used for structural analysis in the automotive, aerospace, and marine industries. Motion instructor guide 3d cad design software solidworks. Eigenvalue analyses to derive mode shapes and mass participation factors assisted the design of large number of footbridges in a timely and efficient manner the red and green lines of the dubai metro. Avoid resonance by varying the frequency either by adding or removing the material from the structure. How can i view modal participation factor after carrying. Vibration analysis with solidworks simulation 2017 goes beyond the standard software manual. Solidworks simulation premium dynamics course this course is targeted for the users who would like to become productive in analyzing structures subjected to various types of dynamic loading. As in previous releases, you can override values for mass and center of mass. Solidworks simulation premium dynamics course solidworks.
Vibration analysis with solidworks simulation 2015 7 before you start notes on handson exercises and functionality of simulation this book goes beyond a standard software manual. For real systems there is often mass participating in the forcing function such as the mass of ground in an earthquake and mass participating in inertia effects the mass of the structure itself, m eq. Understanding the mass participation factor engineer jau. Xue university of calgary solidworks a solid modeling cad tool. Oct 06, 2011 the universally accepted level of mass participation for a linear dynamic study is 0. Sep 06, 2012 till now we are not considering the mass participation factor for targeting the modes. List the resonant frequencies and mass participation factors. Example of how to use the mass participation factor in solidworks. Mass participation normalized you can list mass participation ratios in the global x, y, and z directions normalized with respect to the total mass after running a frequency study. Check cumulative effective mass participation factor cempf. Solidworks simulation is a companion resource and is supplemented by the solidworks simulation online tutorials.
Rightclick the results folder and select list mass participation figure 1. Mass participation factor is also critical for the validity of the results. An overview of solidworks and its associated analysis. Solidworks simulation premium offers a great set of tools dealing with. Quick tip presented by arvind krishnan of goengineer. Never forget to plug in the damping in the system else the results have little value. Cadnative analysis and optimization offer powerful methods for streamlining part design. Nov 18, 2016 some fea software call the input for modal analysis an eigl card for fea basics. Modal effective mass indicates the mass participation of each mode in each of the 6 rigid body motions t1 to r3. Many codes require that at least 80% of the mass of the system. Mode shapes mass participation factor modal effective mass natural frequencies parametric design. When you want to perform a linear dynamic problem small displacement analysis with linear elastic materials, the technique used in solidworks simulation is called modal analysis and requires a frequency analysis to be run first. Because each mode is characterized by its mass participation, a frequently followed rule is to consider enough modes to reach at least 80% of the total mass participation.
How to optimize your parts automatically with solidworks. Solidworks simulation finding mass participation factor youtube. Solidworks simulation premium dynamics training course. Why is the displacement so big when i make a modal analisys. Cosmosworks a design analysis system fully integrated with solidworks, providing one screen solution for stress, frequency, buckling, thermal, and optimization analyses. The software lists the x, y, and zcomponents of the specified force on the selected entities and on the entire model as well. Select the percent used in this direction for each degree of freedom x, y, z, rx, ry, rz for older versions of simulation mechanical, the mass participation information can be found towards the bottom of the log file. It provides a measure of the energy contained within each resonant mode.
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