{"closest_prior_art":[{"name":"M-Alpha simulated-joint qualification and torque auditing","overlap":"Uses a simulated joint reproducing stiffness and friction, repeated installations, clamp-load measurement, torque-angle traces, and a continuous motor drive to reduce operator-dependent variation.","remaining_difference":"Does not report randomized crossover of multiple technicians across tools, access/compliance inserts, and material lots, with the mechanical drive used as a matched actor-substitution condition.","source_ids":["SRC3"]},{"name":"ISO 16047 torque/clamp-force testing plus experimental torque-tension factor studies","overlap":"Directly tests torque against clamp force and experimentally varies physical conditions including tightening speed, coating, friction, and reuse history.","remaining_difference":"Targets fastener tightening characteristics rather than attribution among technician, tool, fixture geometry/compliance, material lot, and their interactions.","source_ids":["SRC1","SRC2"]},{"name":"Crane tJRS automated joint-rate simulator","overlap":"Provides an automated threaded-fastener bench, variable soft-to-hard joint rate, realistic offline tool testing, and torque-angle measurement.","remaining_difference":"Is primarily a tool-test platform; the retained product description does not show direct axial clamp-load attribution, technician crossover, controlled material lots, or matched human-versus-mechanical cells.","source_ids":["SRC4"]}],"contrastive_claim_falsifier":"The remaining claim would be falsified if a prior method is found that already performs the complete matched technician-by-tool-by-fixture/access-by-material crossover with direct axial preload and a mechanical-drive reference, or if the pilot shows that these added swaps produce no reproducible attribution beyond ordinary simulated-joint torque/tension/angle qualification.","contrastive_claim_remaining":"For one defined surrogate joint, randomized technician crossover across calibrated tools, fixture/access conditions, and controlled fastener-lubricant lots, combined with matched mechanical-drive runs, can reveal reproducible person-following, hardware-following, material-following, or interaction-specific preload patterns beyond those supplied by existing torque/clamp-force qualification and automated joint-simulator practices.","experiment_id":"eoa_inverse_innovation_exp13_second_slot_policy60_20260806","gates":{"adequate_source_search":{"rationale":"Four lanes covered the direct proposal, historical torque-tension and M-Alpha terminology, commercial/standards practice, and combinations of operator, friction, speed, stiffness, clamp force, and mechanical simulation. Exactly four opened sources span ISO, ASME research, PCB/RS Technologies, and Crane Electronics.","source_ids":["SRC1","SRC2","SRC3","SRC4"],"status":"PASS"},"bounded_next_test":{"rationale":"A guarded replica-joint pilot with three technicians, two tools, two inserts, two controlled lots, randomized order, calibrated direct preload, and selected mechanical-drive repeats is finite and can test incremental attribution before any production change. Existing standards and benches support the component measurements and simulation approach.","source_ids":["SRC1","SRC3","SRC4"],"status":"PASS"},"distinct_testable_claim":{"rationale":"The retained art closely covers direct torque/clamp-force testing, physical-factor variation, simulated stiffness/friction, and motorized qualification, but none of the opened sources reports the complete technician crossover plus matched mechanical actor substitution across tool, fixture/access, and material conditions.","source_ids":["SRC1","SRC2","SRC3","SRC4"],"status":"PASS"},"no_obvious_safety_or_authority_stop":{"rationale":"The authorized step is limited to rated surrogate hardware, an unloaded replica, calibrated instruments, qualified consenting participants, guarding and explicit halt conditions. Specifications, production hardware, acceptance, and personnel decisions remain with their existing authorities; no retained source indicates an inherent stop to such bench testing.","source_ids":["SRC1","SRC4"],"status":"PASS"},"supported_problem":{"rationale":"The literature directly shows that equal torque need not imply equal clamp load because friction, tightening speed, coating, reuse, stiffness changes, and operator audit technique affect results. The specific workplace allegation against one technician is not independently documented, but the underlying attribution/confounding problem is technically visible.","source_ids":["SRC2","SRC3"],"status":"PASS"}},"prior_art_disposition":"ADJACENT_PRIOR_ART","problem_evidence":{"finding":"PARTLY SUPPORTED: torque-only readings collapse multiple physical influences, and operator-dependent technique can add variation, but the supplied station-specific concentration of outliers and its personnel response remain proposal assertions rather than publicly corroborated observations.","source_ids":["SRC2","SRC3"],"status":"PARTLY_SUPPORTED"},"research_id":"eoa_inverse_innovation_exp13_light_screen_20260806","schema_version":1,"screen_id":"E13P081","screen_survival":true,"search_lanes":{"component_combination":{"no_result_note":"No opened result combined direct axial preload, multiple-technician crossover, interchangeable access/compliance conditions, controlled lots, and a matched mechanical-drive substitute in one attribution experiment.","queries":["manual bolted joint operator variability clamp load torque angle load cell crossover technician study","bolt tightening test rig operator effect preload scatter torque tension mechanical drive","manual tightening operator variability test rig torque angle clamp force study DOE"],"source_ids":["SRC2","SRC3"]},"direct_problem_and_intervention":{"no_result_note":"Direct searches found closely overlapping measurement and simulated-joint qualification methods, but not the complete proposed attribution design.","queries":["manual bolted joint operator variability clamp load torque angle load cell crossover technician study","bolt tightening test rig operator effect preload scatter torque tension mechanical drive","different operators bolt preload"],"source_ids":["SRC2","SRC3","SRC4"]},"products_practices_and_standards":{"no_result_note":null,"queries":["site:iso.org ISO 16047 torque clamp force testing official","bolt tension calibration test bench torque angle clamp force operator first party product joint simulator","torque wrench joint simulator load cell operator training first party"],"source_ids":["SRC1","SRC3","SRC4"]},"synonyms_and_historical_terms":{"no_result_note":"Historical terms such as torque-tension testing, joint qualification, M-Alpha auditing, joint-rate simulation, soft/hard joint, and continuous-drive testing retrieved adjacent methods but no complete actor-structure crossover.","queries":["operator influence torque wrench tightening speed preload study manual assembly bolted joints","operator technique bolt tightening preload","M-Alpha simulated joint qualification continuous drive torque tension angle"],"source_ids":["SRC2","SRC3","SRC4"]}},"sources":[{"claims_supported":["ISO 16047 specifies conditions for torque/clamp-force testing of threaded fasteners and related parts.","Direct torque/clamp-force testing is established standardized practice."],"publisher":"International Organization for Standardization","source_id":"SRC1","source_type":"OFFICIAL_STANDARD","title":"ISO 16047:2005 — Fasteners — Torque/clamp force testing","url":"https://www.iso.org/cms/%20render/live/en/sites/isoorg/contents/data/standard/02/77/27788.html"},{"claims_supported":["Experimental torque-tension work varies tightening speed, coating, and repeated tightening.","Clamp load and torque-tension behavior are sensitive to thread and bearing-surface friction."],"publisher":"American Society of Mechanical Engineers","source_id":"SRC2","source_type":"PRIMARY_RESEARCH","title":"Effect of Tightening Speed on the Torque-Tension and Wear Pattern in Bolted Connections","url":"https://openurl.ebsco.com/contentitem/doi%3A10.1115/1.2749290?id=ebsco%3Adoi%3A10.1115%2F1.2749290&sid=ebsco%3Aplink%3Acrawler"},{"claims_supported":["Torque alone is insufficient to determine clamp load and is sensitive to friction and operator audit technique.","Joint qualification can use a simulated joint reproducing stiffness and friction, direct torque-tension-angle monitoring, repetitions, and a continuous motor drive.","The method is close prior art but does not disclose the complete multi-technician physical crossover."],"publisher":"PCB Piezotronics / RS Technologies","source_id":"SRC3","source_type":"FIRST_PARTY_PRODUCT","title":"An Advanced Torque Auditing Method: The Magic of M-Alpha","url":"https://www.pcb.com/Contentstore/mktgcontent/WhitePapers/WPL_18_Advanced_Torque_Audit.pdf"},{"claims_supported":["A commercial automated threaded joint simulator supports realistic offline tool testing.","The bench varies joint rate from soft to hard and measures torque and angle under automated repeated tests."],"publisher":"Crane Electronics","source_id":"SRC4","source_type":"FIRST_PARTY_PRODUCT","title":"tJRS Joint Test Bench","url":"https://www.crane-electronics.com/product/tjrs-joint-test-bench/"}],"world_novelty_boundary":"This bounded four-source screen supports only an adjacent-prior-art disposition and a narrow remaining experimental contrast. It cannot establish world novelty, patentability, freedom to operate, market size, expert acceptance, production transferability, or realized safety, quality, personnel, or economic value."}