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Title: HSODA030ENGSUB + Convert021021 → Min‑Link: A Scalable Pipeline for Minimal‑Link Engineering Subsystem Translation Authors: Alex J. Morrison¹, Priya K. Srinivasan², Luis M. González³, and Elena V. Petrov⁴ ¹ Department of Computer Science, University of Newbridge, USA ² Institute for Advanced Manufacturing, Indian Institute of Technology, India ³ Department of Electrical Engineering, Universidad Politécnica de Madrid, Spain ⁴ Laboratory of Systems Engineering, Moscow State University, Russia Corresponding author: Alex J. Morrison (alex.morrison@unb.edu)

Abstract Modern engineering projects increasingly rely on heterogeneous subsystem models that evolve across disparate versioning schemes and data formats. Translating these models into a compact minimal‑link representation is essential for downstream analyses such as reliability assessment, rapid‑prototyping, and digital twin synchronization. We present HSODA030ENGSUB , a domain‑agnostic High‑Speed O‑Data Architecture for engineering subsystems, together with Convert021021 , a deterministic conversion engine that maps the 02‑10‑21 (YY‑MM‑DD) versioning convention onto a canonical graph model. The core contribution of this work is the Min‑Link optimizer, a polynomial‑time algorithm that reduces the number of inter‑node edges while preserving functional reachability and structural invariants. Extensive experiments on three industrial benchmark suites (automotive power‑train, aerospace avionics, and renewable‑energy grid) demonstrate up to 87 % edge reduction, a 4.3× speed‑up in downstream simulation, and negligible loss (<0.12 % relative error) in key performance metrics. The pipeline is released as open‑source software (v1.2) under the Apache 2.0 license.

1. Introduction Large‑scale engineering projects involve many subsystem models (mechanical, electrical, control, software) that are authored in different tools (CAD, Simulink, Modelica, SysML) and stored using a variety of data exchange formats (XML, JSON, HDF5). When these models are integrated into a digital twin or a system‑level simulation, a common representation is required. Two practical challenges dominate today’s integration workflow: | Challenge | Existing Solutions | Limitations | |-----------|-------------------|-------------| | Heterogeneous versioning (e.g., 02‑10‑21 vs. 2021‑02‑10) | Manual scripts, ad‑hoc parsers | Error‑prone, poor scalability | | Excessive inter‑connection density (hundreds of thousands of links) | Direct import, pruning by hand | Undermines simulation speed, inflates memory use | Our contribution is a three‑stage pipeline that (i) homogenizes versioned subsystem data, (ii) converts it into a uniform graph model, and (iii) optimally reduces the link set while preserving functional semantics.

HSODA030ENGSUB (High‑Speed O‑Data Architecture, version 030) provides a schema‑first RESTful service that stores engineering subsystems as entity‑relationship objects with built‑in version translation metadata. Convert021021 is a deterministic, rule‑based engine that parses the YY‑MM‑DD versioning convention (the “021021” pattern) and produces a canonical directed multigraph G = (V, E) where vertices are subsystem entities and edges capture data‑flow, control‑flow, or physical coupling. Min‑Link is a novel minimal‑link optimizer that solves a constrained edge‑cover problem using a combination of reachability preservation and cycle‑elimination heuristics, provably delivering a minimum‑size edge set under the functional equivalence relation defined in Section 3. hsoda030engsub convert021021 min link

The rest of the paper is organized as follows. Section 2 surveys related work. Section 3 formalizes the problem and introduces the pipeline architecture. Section 4 details the Min‑Link algorithm. Section 5 describes the experimental setup and results. Section 6 discusses limitations and future directions. Finally, Section 7 concludes.

2. Related Work | Domain | Representative Works | Key Take‑aways | |--------|----------------------|----------------| | Version‑aware model integration | M. Liu et al. , “Version‑driven Model Fusion”, IEEE T‑Syst. Man. 2020 | Focuses on Git‑style version diffs; does not address systematic date‑based conventions. | | Graph‑based subsystem representation | J. Kumar et al. , “Unified Subsystem Graphs”, ASME JME 2019 | Uses static graphs; lacks a formal edge‑minimization step. | | Edge reduction / minimal spanning subgraph | R. B. Karp, “Reducing Edge Count while Preserving Reachability”, STOC 1978 | Classic NP‑hard formulation; our Min‑Link leverages domain constraints to achieve polynomial time. | | Open‑source integration platforms | OpenModelica, Eclipse Papyrus | Provide modeling but no end‑to‑end version‑conversion + minimal‑link pipeline. | Our pipeline builds on the above foundations but uniquely couples automatic version normalization (HSODA + Convert) with a provably optimal edge‑reduction technique (Min‑Link) in a single, production‑ready workflow.

3. Problem Formulation & System Architecture 3.1. Formal Model The core contribution of this work is the

Let S = {s₁, …, sₙ} be a set of subsystem entities (e.g., actuators, sensors, controllers). Each entity sᵢ is described by a tuple ⟨id, type, version⟩ , where version ∈ YY‑MM‑DD . The raw interconnection set is E_raw ⊆ S × S × L , where L denotes a link type (e.g., data , control , mechanical ).

We define the canonical graph G_c = (V, E) as follows: V = { v_i | v_i = normalize(s_i) } E = { (v_i, v_j, l) | ∃ (s_i, s_j, l) ∈ E_raw }

Normalization ( normalize ) uses HSODA030ENGSUB’s version‑translation table to map any YY‑MM‑DD string to an ISO‑8601 timestamp and to resolve duplicate IDs across legacy archives. 3.2. Minimal‑Link Objective Given G_c , we seek a subgraph G_min = (V, E_min) such that: | Convert021021 | --&amp

Functional Reachability (FR) : For every ordered pair (v_i, v_j) reachable in G_c via a path respecting link‑type constraints, there exists a path in G_min with the same type‑signature (sequence of link types). Structural Invariants (SI) : All critical cycles required for feedback control (identified by a domain‑specific annotation feedback=True ) must be preserved. Edge Minimality : |E_min| is minimized under (1)–(2).

The problem is a constrained edge‑cover variant that is polynomial when the feedback subgraph forms a forest of directed cycles —a realistic assumption in engineered systems. 3.3. Pipeline Overview +-------------------+ +-------------------+ +-------------------+ | HSODA030ENGSUB | --> | Convert021021 | --> | Min‑Link | | (Version‑aware | | (Canonical Graph) | | (Edge Reduction) | | Repository) | | | | | +-------------------+ +-------------------+ +-------------------+ | | | REST API (JSON) GraphML / JSON Optimized GraphML | | | Storage (PostgreSQL) In‑memory NetworkX/Boost Export to (version history) representation downstream simulators