Author Affiliations
1Northwest Institute of Nuclear Technology, Xi’an 710024, China2State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Xi’an 710024, Chinashow less
Fig. 1. Structure of the 8-stage Marx generator
Fig. 2. Structure of one stage module
Fig. 3. First mode of the 8-stage Marx generator
Fig. 4. Second mode of the 8-stage Marx generator
Fig. 5. Schematic diagram of the vibration experiment system
Fig. 6. Acceleration curve of frequency sweep before and after the vibration experiment on x axis
Fig. 7. Broken angle iron after random vibration experiment
Fig. 8. Acceleration power spectral density curve at observation point M10 in horizontal direction
Fig. 9. Structure of the Marx generator before and after optimization
Fig. 10. Monitoring results of the Marx generator in transportation vibration on y axis
material | Young’s modulus/GPa | Poisson ratio | density/(kg·m−3)
| stainless steel | 190.0 | 0.33 | 8000 | glass fiber reinforced plastics | 37.2 | 0.25 | 2440 | MC nylon | 31.9 | 0.40 | 1150 |
|
Table 1. Parameters of the material
position | total root mean square acceleration/g | vertical extraction | lateral extraction | longitudinal extraction | U-shape support pole | 2.01 | 1.55 | 0.99 | support board of glass fiber | 2.59 | 1.29 | 0.50 | switch | 1.58 | 0.89 | 0.23 | random load | 1.36 | 0.58 | 0.37 |
|
Table 2. Acceleration response at several points of the Marx generator
position | total root mean square stress/MPa | vertical extraction | lateral extraction | longitudinal extraction | swtich connector | 32.2 | 12.6 | 7.4 | segregation board between
two modules
| 9.8 | 1.3 | 6.4 | angle plate that connects the angle iron
and U-shape support pole
| 6.8 | 2.3 | 1.4 | U-shape support pole | 0.4 | 0.1 | 0.2 | angle plate that connects the U-shape support pole and support board of glass fiber | 13.3 | 3.8 | 4.9 |
|
Table 3. Acceleration response of the Marx generator
testing positions | root mean square of
random vibration/g | magnification
factor
| 1st sweep frequency/Hz
| before vibration | after vibration | support board of glass fiber | 0.57 | 2.8 | 87.8 | 87.8 | angle iron of glass fiber | 1.29 | 6.5 | 97.9 | 96.1 | U-shape support pole | 0.73 | 3.7 | 87.8 | 87.8 | switch connector of the 1st module
| 2.06 | 10.3 | 88.6 | 87.8 | switch and capacitor connectors of the 1st module
| 2.00 | 10.0 | 88.6 | 88.6 | switch and capacitor connectors of the 4th module
| 1.09 | 5.5 | 88.6 | 87.8 |
|
Table 4. Random vibration results of the improved 8-stage Marx pulser in vertical direction
modes | frequency/Hz | | modal descriptions | before modification | after modification | before modification | after modification | 1st order
| 15.4 | 19.7 | | longitudinal vibration on upper Marx | longitudinal vibration on upper Marx | 2nd order
| 26.7 | 30.7 | | local vibration in switch | local vibration in switch and over all vibration |
|
Table 5. Mode characteristic comparison before and after improvement of the Marx generator