This thesis evaluates an alternative method for creating vibration test fixtures. The new method is based on producing fixtures by utilizing the external forces, that a fixture is subjected to during vibration tests, instead of creating it with estimations and guess-work, as it is done today. The purpose is to be able to create fixtures that have high natural frequencies and are reliable during tests and the goal is to create a computational model that corresponds with the real test conditions. The computational model was defined by applying gravitational loads in all six directions on a static solid model and the computation was solved with topology optimization, to create a structure with the most optimal material distribution. Data was collected in quantities and a model was chosen to work further with to create the version that fulfills the requirements. The final version of the fixture was optimized to an optimal weight of $2.5\;kg$ and produced with additive manufacturing in order to test it on an electrodynamic shaker. The result was a fixture with improved characteristics and a computational model proven valid. Kongsberg Automotive can now create vibration fixtures with higher eigenfrequencies, lower mass and lower manufacturing costs, that are more reliable in vibration tests.