橋本優花,本田知己,持田裕介,杉山和彦,中村由美子,南東智佳子
日本機械学会論文集(2018) DOI:10.1299/transjsme.18‑00275
撞機械学習を用いたしゅう動画状態監視システムに関する研究
Machine equlPment uSually compnses many mechanical elements

Oil and used multヰe sensors to collect data regarding the frictionthat can f証l because of functional deterioration and飾、Ction. Fbrforce, the electrical contact resistance, the acoustic emission IAE)

正bo‑elements like plane bea元ngs, 1t lS eXtremely important to diag細Signal, and vibration・ An approprlate leamng sample was selected

nose血e abnormal conditions and prevent such parts缶om break‑usmg k‑fold cross‑Validation・ The electrical contact resistance wasdown caused by wear However; diagnosmg tribo‑elements requlreS

found to contribute relalvely little to血e detection of abnormalities,

expensive diagnostic equ甲ment and expe正se・ This study aims toWhereas the紅ction coe組cient con正buted greatly Furthermore,

PrOPOSe a COSt‑ and time漢e能cdve system血at detect血e signs of

the AE signal and血e vibration detected local changes on血e s皿ng

breakdovm du五ng equlPment OPeradon by usmg maChine leammg

Surface. Consequently we found that machine leammg Can judge

to iden軍y abnormalides. W: COnducted wear tests in contaminatedWhe血er monito五ng data are normal or alJnOrmal.

MoDTC渦中における水素含有DしC膜の異常摩耗メカニズム大久保光,前田寛陽,川田将平,田所千治,佐々木信也
日本機械学会論文集(2018) DOI:10.1299/transjsme.17‑00564
The wear acceleration mechanism of a DLC創m lubrica′ted withtammg tribo皿ms, Which were much harder than DLC used in thisMoDTC solution was investigated by usmg m‑Sltu and ex‑Situ an‑Study Therefore, the MoDTC‑induced wear acceleration of thealytical techniques: RamarしSPeCtrOSCOPy; SEM賀EDS, rIbF‑SIMS,

DLC皿m is caused by hard Mo‑Carbide contammg正bo創ms on aand nano‑indenteL Ffom血e results,血e structural change of thecounter漢face steel surface.

DLC珊m strongly related to the formation of Mo‑Carbide con‑

折れ部を有する曲面の端部から発生するフィードバック音のプラズマアクチュエータを用いた制御宮本孟宜,横山博史,飯田明由
日本機械学会論文集(2018) DOI:10.1299/trans]Sme.18‑00121
Intense sound is radiated due to aeroacoustic feedback loop fromwhile this control e鯖もct is more e能℃tive for the counter‑flow con‑a flow around the tra址ng edge of a curved plate with a kink shape

figuration・ The measured velocity fluctuations present that thesuch as a bomet of an automob血e. Ibr the reduction of this noise,

POWer in broadband缶equency range in the downstream of the目早卜三三l葦二塁︽三宝∴∴∴暗部射撃轟音Ⅲ

the control by a plasma actuator (RA) was investigated・ The aim

actuator becomes larger by the control with both con丘gurations・Of this investigation is to clarify血e e邸ects of flow control by theThe predicted results show that sma皿漢SCale vo正ces are shed nearPA on noise reduction and the noise reduction mechanism. Tb

the wall around the actuator due to the large counter‑flow induced

do this, Wind tunnel experiments with a halfscale bomet model

且ow This introduction of the vortices and the intensi丘cation ofand direct numerical simulations of flow and sound五elds werePerformed・ The investigation of the e耽cts of the position forthe broadband velocity fluctuations lead to the suppression of theflow separation・ AIso, the development of the power of the veloc‑

the installation of the PA on the control presents that the control

ity fluctuations at the fundamentaユfrequency of the baseline tonal

at the position dose to the flow separation pomt arOund the kinksound is weakened by the suppression of the且ow separation・ Thisis e純血ive for the noise reduction. AIso, the control e純3CtS Were

SuPPOrtS the predicted results of the suppression of the two‑di‑

COmPared between co‑flow and counter‑flow con宜gurations re‑mensional vortices contributing to the acoustic radiation aroundgarding the direction of the mean induced flow by the actuator tothe re‑attaChment point by血e control・ Consequently the controI

the freestream・ The mean velocity pro皿es showed that the且ow

Can lead to the suppression of the feedback loop of the radiating

SeParation was suppressed by the controI with bo血con丘gurations,mechanism of tonal sound.