The　lumped　parameter　model　(LPM)　is　a　common　modeling　method　for　simulating　the　vibration　signal　of　the　planetary　gearbox.　Generally,　the　simulation　results　are　not　directly　used　for　the　subsequent　analysis,　because　two　factors　need　to　be　considered:　the　transmission　paths　of　vibration　signals　and　the　amplitude　modulation　effect　of　the　carrier.　However,　both　of　these　factors　are　subjectively　affected.　In　order　to　overcome　this　problem,　a　new　method　for　generating　the　gearbox　vibration　signal　is　proposed.　Based　on　LPM,　the　vibration　displacement　of　each　component　is　solved,　and　meshing　forces　of　the　internal　gear　pairs　are　calculated.　Then,　the　ring　gear　with　bolt　constraints　is　simplified　to　the　Euler-Bernoulli　beam,　and　the　vibration　signal　of　any　point　on　the　ring　gear　is　established　by　solving　the　vibration　of　the　beam.　Subsequently,　based　on　the　new　signal　model,　the　transmission　mechanism,　the　amplitude　modulation　and　the　overlapping　phenomenon　of　the　vibration　signal,　and　the　effect　of　bolt　constraint　on　the　vibration　of　the　gearbox　are　analyzed.　Finally,　the　correctness　of　the　new　method　and　the　effect　of　bolt　constraint　on　the　vibration　signal　are　verified　by　experiments.　(c)　2021　Published　by　Elsevier　Ltd.