To　consider　the　impact　of　time　effects　during　collision　on　the　vibration　reduction　performance　and　mechanism　of　a　non-packed　particle　damper　(NPPD),　an　equivalent　single　particle　mechanical　model　based　on　the　contact　element　method,　EISM-CE　(equivalent　inertia　single-particle　model　based　on　contact　element　method),　was　proposed　on　the　basis　of　the　existing　mechanical　model　EISM　(equivalent　inertia　single-particle　model),　and　a　corresponding　solving　algorithm　for　the　motion　state　of　the　NPPD-single　degree　of　freedom　structure　was　suggested　based　on　the　Runge-Kutta　algorithm.　The　shaking　table　test　of　a　single-layer　steel　frame　structure　with　additional　NPPD　was　also　designed　and　conducted.　The　influence　of　the　filling　ratio　on　the　frequency　response　curve　of　structural　displacement　was　explored.　Further　validation　and　comparative　analysis　of　the　EISM-CE　model　was　conducted　based　on　the　proposed　model　parameter　determination　principle.　After　verifying　the　rationality　of　the　equivalent　model,　the　numerical　analyses　on　the　vibration　reduction　effect　and　energy　change　situation　under　free　vibration,　harmonic　excitation,　and　recorded　strong　ground　motion　were　carried　out　subsequently.　The　results　show　that　the　EISM-CE　model　and　the　corresponding　principle　of　model　parameters　determination　are　more　reasonable　and　effective　than　the　existing　EISM.　The　results　of　the　numerical　analysis　show　that　the　NPPD　has　good　damping　performance　under　different　excitations.　The　damping　performance　and　mechanism　of　the　EISM-CE　model　are　somewhat　different　from　those　of　the　EISM　when　considering　the　collision　time　effect.　©　2024　Chinese　Vibration　Engineering　Society.　All　rights　reserved.