Performability of automated manufacturing systems with centralized material handling

We present a framework for performance evaluation of manufacturing systems subject to failure and repair. In particular, we determine the mean and variance of accumulated production over a specified time frame and show the usefulness of these results in system design and in evaluating operational policies for manufacturing systems. We extend this analysis for lead time as well. A detailed performability study is carried out for the generic model of a manufacturing system with centralized material handling. Several numerical results are presented, and the relevance of performability analysis in resolving system design issues is highlighted. Specific problems addressed include computing the distribution of total production over a shift period, determining the shift length necessary to deliver a given production target with a desired probability, and obtaining the distribution of Manufacturing Lead Time, all in the face of potential subsystem failures.

Riorganizzazione della manutenzione in ottica TPM: il caso Toyota Material Handling Manufacturing Italy

Il presente lavoro di tesi nasce dall'attività di stage svolto presso la Toyota Material Handling Manufacturing Italy S.p.A. di Bologna, azienda specializzata nella produzione di carrelli elevatori. Lo scopo prefissato di questo elaborato è quello di fornire una visione globale della Total Productive Maintenance, andando successivamente ad illustrare gli strumenti e le metodologie impiegate in un contesto reale e quindi i risultati ottenibili nel medio-lungo termine. La prima parte dell’elaborato va ad illustrare lo scenario moderno nel quale le imprese sono chiamate a confrontarsi e a competere per raggiungere i propri obiettivi. Nella seconda parte viene trattato il tema della “manutenzione dei sistemi produttivi” con particolare attenzione agli approcci risolutivi e alle politiche intraprese nel corso degli ultimi anni per poi analizzare il principale strumento di gestione della manutenzione utilizzato in scala mondiale, ovvero la Total Production Maintenance. L’ultima parte, dopo un capitolo riservato alla presentazione dell’azienda, si concentra sulle attività svolte presso l’azienda, sugli strumenti e tecniche utilizzate, per poi analizzare i risultati ottenuti ed ottenibili grazie al percorso intrapreso.

Equipment improvement report and maintenance summary for TARCOM equipment : tank-automotive, commercial, construction, and material handling equipment (MHE).

"1 June 1977."

Organizational maintenance repair parts and special tools lists : truck, cargo, 8 ton, 4x4, M520 w/winch NSN 2320-00-873-5422, truck, cargo, 8 ton, 4x4, M520 w/o winch NSN 2320-00-191-1310, truck, cargo, 8 ton, 4x4, M877 w/winch, w/material handling crane NSN 2320-01-010-4956 ....

"September 1985."

Direct support and general support maintenance repair parts and special tools lists (including depot maintenance repair parts and special tools lists) : truck, cargo, 8 ton, 4x4, M520 w/winch NSN 2320-00-873-5422, truck, cargo, 8 ton, 4x4, M520 w/o winch NSN 2320-00-191-1310, truck, cargo, 8 ton, 4x4, M877 w/winch, w/material handling crane NSN 2320-01-010-4956 ....

"October 1985."

Direct support and general support maintenance repair parts and special tools lists (including depot maintenance repair parts and special tools lists) : truck, cargo, 8 ton, 4x4, M520 w/winch NSN 2320-00-873-5422, truck, cargo, 8 ton, 4x4, M520 w/o winch NSN 2320-00-191-1310, truck, cargo, 8 ton, 4x4, M877 w/winch, w/material handling crane NSN 2320-01-010-4956 ....

Includes index.

Hand receipt covering contents of Components of End Items (COEI), Basic Issue Items (BII) and Additional Authorization List (AAL) for truck, cargo, 8 ton, 4x4, M520 w/winch (NSN 2320-00-873-5422), M520 w/o winch (NSN 2300-00-191-1310), M877 w/winch, w/material handling crane (NSN 2320-01-010-4956), M877 w/o winch, w/material handling crane (NSN 2320-01-010-4957), truck, wrecker, 10 ton, 4x4, M553 (NSN 2320-00-873-5426), truck, tanker, fuel servicing, 2500 gallon, 4x4, M559 w/winch (NSN 2320-00-873-5420), M559 w/o winch (NSN 2320-00-445-7250).

"May 1983."

French good practice guidelines for management of the risk of low back pain among workers exposed to manual material handling: Hierarchical strategy of risk assessment of work situations

International audience

Aufbau hochfunktionaler Intralogistik-Knoten mittels kleinskaliger Module als Cognitive Conveyor

Kleinskalige, multifunktionale Module haben ein hohes Potential bei der wirtschaftlichen und flexiblen Gestaltung intralogistischer Systeme mit hoher Funktionalität. Durch dezentrale Steuerung und eigener Intelligenz der Module ist das System frei skalierbar und der Installationsaufwand wird minimiert. Mittels eines neuartigen Konzeptes der Datenkommunikation für Stetigförderer erfolgt der Informationsaustausch drahtlos mit Hilfe optoelektrischer Elemente. Die Kleinskaligkeit der Transportmodule gegenüber der Transporteinheit im Zusammenhang mit dem Steuerungskonzept erlaubt eine selektive Beschaltung der Module nach Bedarf und damit eine optimierte Energieausnutzung im Betrieb. Prototypen auf Basis von Schwenkrollen mit integrierter Antriebstechnik und Steuerung lassen das Potential des Prinzips erkennen. Das neu entwickelte Konzept der Schrägscheibe hilft bei der anspruchsvollen Integration der Antriebstechnik in das Modul durch das Prinzip der koaxialen Aktoren. Durch omnidirektionalen Funktionsumfang der Module entsteht im Zusammenschluss zu einer Modulmatrix ein hochflexibel einsetzbares Intralogistik-Modul. Die Vernetzung dieser hochfunktionalen Knoten durch einfache Fördertechnik bietet die Möglichkeit einfacher Planung flexibler Logistiksysteme.

Simulation-based baggage handling system merge analysis

This paper details the investigation into the design and control of merging bottlenecks of conveyor-based baggage handling systems, encompassing the merging control algorithm and the impact of the merge's physical layout. A methodology for the analysis of simulation model results is presented. Results show that the layout of the merge influences bag throughput and when the physical configuration is in a preferred position, input variance has no effect on bag throughput performance. These results have potential application to other material handling systems, such as those used in manufacturing and warehousing.

Effective diffusivity and evaporative cooling in convective drying of food material

This article presents mathematical models to simulate coupled heat and mass transfer during convective drying of food materials using three different effective diffusivities: shrinkage dependent, temperature dependent and average of those two. Engineering simulation software COMSOL Multiphysics was utilized to simulate the model in 2D and 3D. The simulation results were compared with experimental data. It is found that the temperature dependent effective diffusivity model predicts the moisture content more accurately at the initial stage of the drying, whereas, the shrinkage dependent effective diffusivity model is better for the final stage of the drying. The model with shrinkage dependent effective diffusivity shows evaporative cooling phenomena at the initial stage of drying. This phenomenon was investigated and explained. Three dimensional temperature and moisture profiles show that even when the surface is dry, inside of the sample may still contain large amount of moisture. Therefore, drying process should be carefully dealt with otherwise microbial spoilage may start from the centre of the ‘dried’ food. A parametric investigation has been conducted after the validation of the model.