The thesis proposes an all-round description of an on-demand shared mobility service for the joint transportation of people and parcels, which is then tested through numerical quantitative analysis. The thesis includes a literature review that let emerge how the study of joint on-demand shared transportation has a limited amount of contributions. Moreover, not a single paper has been identified which combines an urban consolidation centre and a shared demand responsive system. Hence, the thesis focuses on a first description on the ideal operativity of the service and its main decision and operational variables. Then, the formal mathematical definition of the problem is provided, using as references the SARP and SARPLP models. Next, the Agent-Based model which aims at representing the dynamicity of the service it self. To test the goodness of the model of the presented mobility solution, a numerical quantitative analysis has been performed on the Agent-Based Model. For the basic scenario the performances related to profitability, sustainability and service level were considered. Those results were then compared to the one obtained from simulating two comparable mobility services which conceived separate transportation services for people and parcels. The last step of the quantitative analysis was the sensitivity analysis performed on the model, by changing the variables related to fleet dimension, spatial distribution of demand, passengers’ maximum waiting time, maximum on-vehicle time of passengers. The numerical results gained after 24100 runs of the simulation, show how the model developed is profitable in all the situations tested. At the same time, it was not the best performing system in all dimensions of analysis compared to the other service. But, it was the only profitable service with low emissions and a satisfying service level. Concerning managerial implications, the implementation of a shared on-demand mobility for people and parcels delivery should be considered as a possible transportation alternative to already existing mobility services. Mainly, due to its milage efficiency and the higher level of profitability of this typology of system.
La tesi propone una descrizione globale di un servizio di mobilità condivisa e flessibile per il trasporto congiunto di persone e pacchi, il quale viene poi testato attraverso un'analisi numerica quantitativa. La tesi comprende una revisione della letteratura, la quale ha fatto emergere come lo studio del trasporto condiviso e flessibile abbia un numero limitato di contributi. Inoltre, non è stato individuato un solo articolo accademico che combini un centro di consolidamento urbano e un sistema di mobilità condiviso e flessibile. La ricerca si concentra quindi su una prima descrizione dell'operatività del servizio. Successivamente, viene fornita la definizione matematica formale. A seguire, il modello Agent-Based viene definito con lo scopo di rappresentare la dinamicità del servizio. Per testare la bontà del modello e della soluzione di mobilità presentata, è stata eseguita un'analisi quantitativa sul modello ad agenti. Per lo scenario di base sono state considerate le prestazioni relative a profittabilità, sostenibilità e livello di servizio. Questi risultati sono stati confrontati con quelli di due servizi di mobilità che prevedevano servizi di trasporto separati per persone e pacchi. L'ultimo passo è stata l'analisi di sensitività, modificando le variabili del modello relative alla dimensione della flotta, alla distribuzione spaziale della domanda, al tempo massimo di attesa di un passeggero, al tempo massimo di permanenza dei passeggeri a bordo. I risultati numerici ottenuti dopo 24100 esecuzioni della simulazione, mostrano come il modello sviluppato sia profittevole in tutte le situazioni testate. Tuttavia, il sistema non sì è dimostrato il più performante in tutte le di analisi. Eppure, è stato l'unico servizio redditizio con basse emissioni e un livello di servizio soddisfacente. Per quanto riguarda le implicazioni manageriali, l'implementazione di una mobilità condivisa su richiesta per la consegna di persone e pacchi dovrebbe essere considerata come una possibile alternativa di trasporto ai servizi di mobilità già esistenti. Soprattutto per la sua efficienza chilometrica e per il maggior livello di redditività di questa tipologia di sistema.
On-demand shared mobility and parcel delivery : scenario analysis with a simulation model
CAVINA, FRANCESCO
2021/2022
Abstract
The thesis proposes an all-round description of an on-demand shared mobility service for the joint transportation of people and parcels, which is then tested through numerical quantitative analysis. The thesis includes a literature review that let emerge how the study of joint on-demand shared transportation has a limited amount of contributions. Moreover, not a single paper has been identified which combines an urban consolidation centre and a shared demand responsive system. Hence, the thesis focuses on a first description on the ideal operativity of the service and its main decision and operational variables. Then, the formal mathematical definition of the problem is provided, using as references the SARP and SARPLP models. Next, the Agent-Based model which aims at representing the dynamicity of the service it self. To test the goodness of the model of the presented mobility solution, a numerical quantitative analysis has been performed on the Agent-Based Model. For the basic scenario the performances related to profitability, sustainability and service level were considered. Those results were then compared to the one obtained from simulating two comparable mobility services which conceived separate transportation services for people and parcels. The last step of the quantitative analysis was the sensitivity analysis performed on the model, by changing the variables related to fleet dimension, spatial distribution of demand, passengers’ maximum waiting time, maximum on-vehicle time of passengers. The numerical results gained after 24100 runs of the simulation, show how the model developed is profitable in all the situations tested. At the same time, it was not the best performing system in all dimensions of analysis compared to the other service. But, it was the only profitable service with low emissions and a satisfying service level. Concerning managerial implications, the implementation of a shared on-demand mobility for people and parcels delivery should be considered as a possible transportation alternative to already existing mobility services. Mainly, due to its milage efficiency and the higher level of profitability of this typology of system.| File | Dimensione | Formato | |
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https://hdl.handle.net/10589/195216