{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:AOJGVZ2DOWGNXRXUISZRUCU4ZE","short_pith_number":"pith:AOJGVZ2D","canonical_record":{"source":{"id":"2605.20778","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2026-05-20T06:18:03Z","cross_cats_sorted":[],"title_canon_sha256":"aafd064bab8462500d8531b4ad966ce0b8df0a83d698823f428464adc98ab01e","abstract_canon_sha256":"b6e9e5cca9f8be1c1bcce609325b2c00b8c78ecfcdad0589f2865657ff8e0c3e"},"schema_version":"1.0"},"canonical_sha256":"03926ae743758cdbc6f444b31a0a9cc90eafbe78aba82a78efcf2cb45853573e","source":{"kind":"arxiv","id":"2605.20778","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.20778","created_at":"2026-05-21T01:04:53Z"},{"alias_kind":"arxiv_version","alias_value":"2605.20778v1","created_at":"2026-05-21T01:04:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.20778","created_at":"2026-05-21T01:04:53Z"},{"alias_kind":"pith_short_12","alias_value":"AOJGVZ2DOWGN","created_at":"2026-05-21T01:04:53Z"},{"alias_kind":"pith_short_16","alias_value":"AOJGVZ2DOWGNXRXU","created_at":"2026-05-21T01:04:53Z"},{"alias_kind":"pith_short_8","alias_value":"AOJGVZ2D","created_at":"2026-05-21T01:04:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:AOJGVZ2DOWGNXRXUISZRUCU4ZE","target":"record","payload":{"canonical_record":{"source":{"id":"2605.20778","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2026-05-20T06:18:03Z","cross_cats_sorted":[],"title_canon_sha256":"aafd064bab8462500d8531b4ad966ce0b8df0a83d698823f428464adc98ab01e","abstract_canon_sha256":"b6e9e5cca9f8be1c1bcce609325b2c00b8c78ecfcdad0589f2865657ff8e0c3e"},"schema_version":"1.0"},"canonical_sha256":"03926ae743758cdbc6f444b31a0a9cc90eafbe78aba82a78efcf2cb45853573e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-21T01:04:53.755900Z","signature_b64":"M9GpR+cUCk0XxECDidh9UM3Qree8O8ySTjnNN5nOWfgDoj0PbRdI5vMCQw/1dfMvOKMY5MFrAkeIwp0+Y23nAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"03926ae743758cdbc6f444b31a0a9cc90eafbe78aba82a78efcf2cb45853573e","last_reissued_at":"2026-05-21T01:04:53.755090Z","signature_status":"signed_v1","first_computed_at":"2026-05-21T01:04:53.755090Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.20778","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-21T01:04:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uFngDjKy1Ja+PH+6dXcj1X/MpYM9f65X0yXE9fuuDnhXYh9dp+HQLfT3eVrfzJQJ/ZbeaIOSgl1UWtsrizggBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T04:46:58.777805Z"},"content_sha256":"776d8ba78e3469edc89912f8dc429e03fa3450ee2120218ec98d3229a281d6d6","schema_version":"1.0","event_id":"sha256:776d8ba78e3469edc89912f8dc429e03fa3450ee2120218ec98d3229a281d6d6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:AOJGVZ2DOWGNXRXUISZRUCU4ZE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Deep Reinforcement Learning Discovers a Novel Control Algorithm for Mitigating Flow-Induced Vibrations in Underactuated Tandem Cylinders","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.flu-dyn","authors_text":"Hussam Sababha, Mohammed Daqaq","submitted_at":"2026-05-20T06:18:03Z","abstract_excerpt":"This study presents the first experimental implementation of deep reinforcement learning (DRL) for the active real-time suppression of flow-induced vibrations in simultaneously vibrating tandem cylinders using rotary actuation, considering fully actuated and underactuated configurations. In the fully actuated case, where both cylinders are independently controlled, the DRL agent discovers a high-frequency, phase-locked bang-bang control strategy that suppresses the vibrations of both cylinders by more than 95\\%. Analysis of the training dynamics reveals a physically interpretable learning proc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.20778","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.20778/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-21T01:04:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"h6fYtBUbPi/wGkLYBwBq4UV0P4PmagEhsHxtrlDed7v+FDn1E8+ElyH5ByQpTWfxyxRUrn2tIRoaOCvecVjYCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T04:46:58.778175Z"},"content_sha256":"c1dfce925c625853dbacdaa7f68baf4a022599c65913afcd1454cd57b34b8cf8","schema_version":"1.0","event_id":"sha256:c1dfce925c625853dbacdaa7f68baf4a022599c65913afcd1454cd57b34b8cf8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AOJGVZ2DOWGNXRXUISZRUCU4ZE/bundle.json","state_url":"https://pith.science/pith/AOJGVZ2DOWGNXRXUISZRUCU4ZE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AOJGVZ2DOWGNXRXUISZRUCU4ZE/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-02T04:46:58Z","links":{"resolver":"https://pith.science/pith/AOJGVZ2DOWGNXRXUISZRUCU4ZE","bundle":"https://pith.science/pith/AOJGVZ2DOWGNXRXUISZRUCU4ZE/bundle.json","state":"https://pith.science/pith/AOJGVZ2DOWGNXRXUISZRUCU4ZE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AOJGVZ2DOWGNXRXUISZRUCU4ZE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:AOJGVZ2DOWGNXRXUISZRUCU4ZE","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"b6e9e5cca9f8be1c1bcce609325b2c00b8c78ecfcdad0589f2865657ff8e0c3e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2026-05-20T06:18:03Z","title_canon_sha256":"aafd064bab8462500d8531b4ad966ce0b8df0a83d698823f428464adc98ab01e"},"schema_version":"1.0","source":{"id":"2605.20778","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.20778","created_at":"2026-05-21T01:04:53Z"},{"alias_kind":"arxiv_version","alias_value":"2605.20778v1","created_at":"2026-05-21T01:04:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.20778","created_at":"2026-05-21T01:04:53Z"},{"alias_kind":"pith_short_12","alias_value":"AOJGVZ2DOWGN","created_at":"2026-05-21T01:04:53Z"},{"alias_kind":"pith_short_16","alias_value":"AOJGVZ2DOWGNXRXU","created_at":"2026-05-21T01:04:53Z"},{"alias_kind":"pith_short_8","alias_value":"AOJGVZ2D","created_at":"2026-05-21T01:04:53Z"}],"graph_snapshots":[{"event_id":"sha256:c1dfce925c625853dbacdaa7f68baf4a022599c65913afcd1454cd57b34b8cf8","target":"graph","created_at":"2026-05-21T01:04:53Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2605.20778/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"This study presents the first experimental implementation of deep reinforcement learning (DRL) for the active real-time suppression of flow-induced vibrations in simultaneously vibrating tandem cylinders using rotary actuation, considering fully actuated and underactuated configurations. In the fully actuated case, where both cylinders are independently controlled, the DRL agent discovers a high-frequency, phase-locked bang-bang control strategy that suppresses the vibrations of both cylinders by more than 95\\%. Analysis of the training dynamics reveals a physically interpretable learning proc","authors_text":"Hussam Sababha, Mohammed Daqaq","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2026-05-20T06:18:03Z","title":"Deep Reinforcement Learning Discovers a Novel Control Algorithm for Mitigating Flow-Induced Vibrations in Underactuated Tandem Cylinders"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.20778","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:776d8ba78e3469edc89912f8dc429e03fa3450ee2120218ec98d3229a281d6d6","target":"record","created_at":"2026-05-21T01:04:53Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"b6e9e5cca9f8be1c1bcce609325b2c00b8c78ecfcdad0589f2865657ff8e0c3e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.flu-dyn","submitted_at":"2026-05-20T06:18:03Z","title_canon_sha256":"aafd064bab8462500d8531b4ad966ce0b8df0a83d698823f428464adc98ab01e"},"schema_version":"1.0","source":{"id":"2605.20778","kind":"arxiv","version":1}},"canonical_sha256":"03926ae743758cdbc6f444b31a0a9cc90eafbe78aba82a78efcf2cb45853573e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"03926ae743758cdbc6f444b31a0a9cc90eafbe78aba82a78efcf2cb45853573e","first_computed_at":"2026-05-21T01:04:53.755090Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-21T01:04:53.755090Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"M9GpR+cUCk0XxECDidh9UM3Qree8O8ySTjnNN5nOWfgDoj0PbRdI5vMCQw/1dfMvOKMY5MFrAkeIwp0+Y23nAw==","signature_status":"signed_v1","signed_at":"2026-05-21T01:04:53.755900Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.20778","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:776d8ba78e3469edc89912f8dc429e03fa3450ee2120218ec98d3229a281d6d6","sha256:c1dfce925c625853dbacdaa7f68baf4a022599c65913afcd1454cd57b34b8cf8"],"state_sha256":"6b9d9e2484c37c121deb5b0383b8bc4c0e5a986a844033b18eb6cb7d1b7a769d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ogqvw2SRamIE5fpm88CXYAgosQYRkpTN0FrNIWX2OlWYg6pVRzO2IO+NeowYRBZNqkjvHajt76KF2QyNxR1wBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T04:46:58.780127Z","bundle_sha256":"45d26d4504cf5aa3232e7f856a994c7906903426f2bdd1fb42839742bdb19b4a"}}