Srs of a half sine impulse half sine impulse 11 ms 0 2 4 6 8 10 12. It is a great choice if your professor is already using it for your course or if you are already familiar with the ansys workbench platform. Prestigious companies in northern california turn to ozen engineering as the singlesource of reliable simulation solutions. A half sine acceleration pulse is applied to pivot shaft and central zone of the disk at the same time. The acceleration may, for example, be 20 g, 50 g, or 100 g g 9. A shock response spectrum srs is a graphical representation of a shock, or any other transient acceleration input, in terms of how a single degree of freedom sdof system like a mass on a spring would respond to that input. Calculation of shock response spectrum vsb tu of ostrava faculty of mechanical engineering. If you have a modal analysis and link the solution of the modal into the setup cell of the transient structural, you will be making it a linear analysis, which is good to do for a first evaluation. Either singlepoint or multipoint response spectrum analysis can be performed. A half sine pulse was provided as an input shock pulse to washing machine with the bottom cushion pad fastened to the shock table. I will sit down with the engineer in my dept tomorrow, i am a designe. The acceleration amplitude, as well as the duration of the shock, can have different values. Standard image export powerpoint slide figure 11 shows the drop hammer experiment results. In this paper, a fe model of the st drive is developed in ansys, which includes pivot bearing, hsa and disk.
Ansys student is used by hundreds of thousands of students globally. A shock pulse can be characterised by its peak acceleration, the duration, and the shape of the shock pulse half sine, triangular, trapezoidal, etc. How does that compare with the frequency of your half sine, which at ms is a 38. Shock response spectrum analysis is a fast and easy way to get started with shock and drop simulations. This is a mode superposition method that requires the model to be. A half sine acceleration pulse is applied to pivot shaft and central zone of the disk at the. The results show that the first twenty natural frequencies can be classified into five families, including the total system vibration mode, singleelement. Hi all,one of our customers has submitted a spec for operating shock and vibration per milstd 167 with certain values. And evaluation of shock response of a mixed flow fan david jonathan gonzalez campos for many engineers that use finite element analysis or fea, it very important to know how to is. Shock is a vector that has units of an acceleration rate of change of velocity. Pdf study of the shock response of the hdd with ansyslsdyna. Im new to ansys fluent, so sorry if this is a basic question. Resonant frequencies are compared with the modal testing results. The transient dynamic model needs to be linear for this to work well i think, so its usually not that big a deal to run a linear transient analysis with the half sinusoid shock load.
The impact is assumed to be a half sine loading with a hand caclulated time duration expressed a a harmonic frequency. Study of the shock response of the hdd with ansys lsdyna. Nuclear power plant buildings and components, for seismic loading airborne electronic equipment for shock loading commercial buildings in earthquake zones types of response spectrum analysis. Research on the shock resistance optimal design of small. How can i define a halfsine, a sawtooth, or a rectangular. My model had a cantilever beam, and my model was meshed totally with solid164 elements. Feb 24, 2004 i did a shock analysis in ansyslsdyna version. Ansys spaceclaim modeling and transient structural fea of camshaftrockervalve assembly. Depending on the results requested in analysis settings for a response spectrum solution, velocity and acceleration results can be obtained, in addition to deflection, stress and strain. After preprocessing in hypermesh, the model is analyzed using lsdyna, a commercially available finite element transient solver. Comparison of transient vs rsdiff mode combinations results. Study of the shock response of the hdd with ansyslsdyna.
The purpose of this report is to explain the shock response spectrum and to give a. The drop height was increased until 400 mm when one straightened suspender failed. For the free online simulation course from cornell university, ansys student 2019 r3 is recommended. Explicit dynamics solution depends only on previous time step requires a very small subs time step limited to problem with duration in milliseconds or less. Calculation of shock response spectrum vsb tu of ostrava. The shock profile can be approximated as a half sine, a sawtooth, or a rectangular pulse. A common description of impact, used in several standards, is a half sine acceleration pulse. Fabrication and characterization of a multidirectional. Transient structural dynamic shock analysis of compressor base. Ansys mechanical workbench supports response spectrum analysis. A study of shock analysis using the finite element method. Xansys view topic xansys dynamic amplification factor.
Ansys have a number of different mode combinations methods. A correlation was developed between linear and rotary shock tests. Ansys apdl commands objects after response spectrum analysis. A flat disc with a central mass is subjected to a shock test. The finite element model fem analysis package, ansys, is used to calculate the natural frequencies and vibration modes of the drive system. Shock pulse width effects in operational drop test simulation. Timehistory analysis of simple structures under shock. I have done a quick test using ansys mechanical by applying a global acceleration of 500ms2 to the disk and fixing the outer bosses. It depicts ansys workbench transient dynamic shock analysis.
People who resort this problem with lsdyna or ansyslsdyna will be normally directed to the default element technology, which is reduced integration constant stress or ri. Then the head slap behavior of the slider in the nonoperating state is simulated with the implicittoexplicit analysis function of ansys. Singlepoint response spectrum a single response spectrum excites all specified points in the model. Mechanical effects due to pulse width variation of shock inputs. Apr 17, 2017 analysis for shock absorber in ansys r16 i am. Performing shock response spectrum calculation from a acceleration time history signal free download at. A halfsine acceleration pulse is applied to pivot shaft and central zone of the disk at the same time. The applied half sine shock acceleration with different amplitudes can be obtained by adjusting the predetermined height of the dropping table. Among the many parameters start programs ansys release 7. Drop test and finite element analysis of test board. I want to know how to define it in ansys function editor. Base acceleration in harmonic analysis using ansys mechanical. Can the stress analysis perform what i need to simulate. Halfsine wave shock loads with various initial velocities to the base.
Functional shock test per milstd810 equivalent static load mechengdude mechanical op. Since the finite element software cannot directly input the half sine wave load in explicit analysis, total 19 time steps to approximate the half sine curve into 18 intervals were applied for the varied acceleration. Vibration analysis of a twostep sine movable tooth drive. The student community is a public forum for authorized ansys academic product users to share ideas and ask questions. If you are doing sine onrandom mixed mode testing, it is often useful to be able to convert between psd and sine amplitude and vice versa. Shock response spectrum f n1 shock is recorded in digital form, commonly as acceleration signal.
Allen and bogy 2 studied the shock res ponse at the componen t level for the disk, the su spension and the slider. Jun 24, 2014 performing shock response spectrum calculation from a acceleration time history signal free download at. Ansys mechanical apdl and mechanical workbench can perform harmonic analysis on a structure, determining the steadystate sinusoidal response to. Case study for northrop grumman information systems lx course. Shock analysis of a new ultrasonic motor subjected to halfsine. Functional shock test per milstd810 equivalent static load. Download scientific diagram halfsine wave shock loads with various initial.
The shock response spectrum is a useful tool for estimating the damage potential of a shock pulse, as well as for test level specification. If so, share your ppt presentation slides online with. Although ozen engineering is headquartered in the heart of silicon valley, we collaborate with bestinclass companies worldwide to optimize product design performance and improve product development processes for our clients wherever they are located and across a wide. Xansys view topic xansys struc how to apply damping. A half sine pulse of acceleration was applied to the model by edload command. Shock and vibration analysis using ansys mechanical normal.
Ive used this technique to do half sinusoid shock test simulation on electronics equipment, and gotten good correlation with ansys transient results. Conformable hydrogen tanks need for standards development. The half sine wave impulse was to replace impact response of disk drive. I basically want to model a shock tube, where pressurized air is kept behind a diaphragm in an enclosed tube, and at t0 the diaphragm bursts and the pressurized air propagates in the enclosed tube. The disk is fixed to a rig which subjects it to a half sine acceleration pulse which lasts for 6ms 0. The unit g or g represents multiples of the acceleration of gravity and is conventionally used. The shock is simulated as half sine wave acceleration applied at the enclosure base of the hard disk drive. Shock analysis using the pseudo velocity shock spectrum part 1 is the property of its rightful owner. A study of shock analysis using the finite element method verified with euler bernoulli beam theory. Element analysis fea with the ansys software was conducted to obtain the relative displacement of a key point of the motor. A semi sine acceleration pulse is applied to the shaft and the central zone of the disk at the same time. Drop test simulation made easy with ansys simulation.
These equations strictly apply only in the linear region of response. Halfsine shock earth gravity ansys student community. In this study, a 3d model of a twostep sine movable tooth drive is developed in the ug software. Its usually defined as half sine wave, otherwise described differently by companys specification. Ansys spaceclaim modeling and transient structural fea of camshaftrockervalve assembly duration. Sep 23, 2019 the student community is a public forum for authorized ansys academic product users to share ideas and ask questions. Shock analysis on a packaged washing machine from damage. The shock tests were repeated twice at a 400 mm drop height.
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