Tommaso Tamarozzi

KU Leuven | ku leuven · Department of Mechanical Engineering

Accurate numerical models are pivotal throughout the design and whole operation life cycle of a mechanical system. Ideally, such models should be efficient in terms of both their computational and updating time. These requirements are often contrasting. For flexible multibody models, computational efficiency is commonly achieved by employing Model...

Tracking the evolution in time of parameters, input and states of a structural dynamic system is often difficult, since their direct measurement can be problematic or even impossible. It is of great interest to estimate these quantities based on output-only data from a limited set of sensors. This work proposes an estimation technique for states, i...

This paper presents a physics-based virtual sensing approach to estimate the full-field pressure responses during direct field acoustic excitation testing (DFAX) through MIMO random control. It makes use of a system level physics based model that consists of an electro-mechanical lumped parameter model of the speaker and a finite element model to d...

This research paper presents a novel gear contact element for straight bevel gears, which aims to deliver a fast, accurate and user-friendly gear contact element that was specially designed to handle the complex nature of gear tooth meshing in straight bevel gear drives. The presented element has been implemented in a multibody simulation code to s...

div class="section abstract"> Executable Digital Twins (xDT) are starting a revolution in the industry, where high fidelity simulation models extend their usage from the design and validation phases to in-operation and service phase. Two critical technology blocks in this revolution are Model Order Reduction and Smart Virtual Sensing. The former al...

The direct measurement of the external loads acting on a mechanical component represents often a challenge in many engineering applications. In this context, the attention of many researchers is focused on the field of inverse load identification. Several techniques are proposed in literature to address this problem by means of experimental methodo...

A novel model order reduction technique for the elastohydrodynamic problem consisting of the Reynolds equation and the elasticity equation is proposed that drastically reduces the dimensionality of the problem and the computing time. The method is developed for stationary Newtonian isothermal line contacts. It employs the Galerkin projection method...

Virtual sensing procedures have gained increased adoption to combine sensor data with simulation models to estimate physical quantities for which the direct measurements are not feasible, due to cost, accessibility or other restrictions. This is achieved by means of state estimator technology based on linear or non-linear versions of Kalman filters...

When simulating elastohydrodynamic lubrication, two main approaches are usually followed to predict the pressure and fluid film thickness distribution throughout the contact. The conventional approach relies on the Reynolds equation to describe the thin lubricant film, which is coupled to a Boussinesq description of the linear elastic deformation o...

A penetration-based gear contact model for accurate and numerically efficient tooth contact analysis of spiral bevel gears is used to investigate the simulation of gear alignment errors. The developed gear contact model with surfaces of roll angles, computed for the gear pair’s tooth flanks in the absence of misalignments, is shown to be well capab...

Virtual sensing is an emerging technology with a wide application potential for the industry. The combination of sensor measurement data with simulation models allows the estimation of physical quantities, of which a direct measurement is not feasible, for reasons of, e.g., cost and accessible space. The estimated physical quantities can be system...

An increasing complexity of models used to predict real-world systems leads to the need for algorithms to replace complex models with far simpler ones, while preserving the accuracy of the predictions. This three-volume handbook covers methods as well as applications. This third volume focuses on applications in engineering, biomedical engineering,...

We are currently facing a substantial transformation of our industrial world and the way our economics are organized. This transformation, known as digitalization, is driven by the systemic integration of information technology in all kinds of devices, machines, and factories such that new smart networks are formed and new smart products have the a...

The knowledge of the dynamic behavior of a mechanical system in a certain operating scenario is essential in many industrial applications. In particular, nowadays, the accurate and concurrent identification of the response fields and external loads represents a challenging target. Several experimental techniques, some exploiting a coupling with sim...

Environmental tests are typically conducted in order to reproduce the operational response of a system. Non-realistic excitation mechanisms and mismatches between operational and test boundary conditions, represent relevant limitations of the currently adopted testing procedures. The Boundary Condition Challenge (BCC) addresses the assessment of a...

Durability prediction of suspension systems in vehicles has always been a critical parameter in quest of more performant, efficient, and safe cars. Since the experiments with fully instrumented vehicles on the road are very expensive, tests are typically performed in a laboratory environment. Using time waveform replication (TWR), the control signa...

The interaction between the rotating blades and the external fluid in non-axial flow conditions is the main source of vibratory loads on the main rotor of helicopters. The knowledge or prediction of the produced aerodynamic loads and of the dynamic behavior of the components could represent an advantage in preventing failures of the entire rotorcra...

This work proposes an augmented extended Kalman filter based state-input estimator for mechanical systems defined by implicit equations of motion which is then applied to estimate the six wheel center loads and the strain field on a vehicle suspension test rig. Implicit equations of motion typically arise in the definition of flexible multibody mod...

The potential of the Augmented Kalman Filter algorithm is tested in this paper for joint state-input estimation in structural dynamics field. In view of inverse load identification, the filter is compared with the Transfer Path Analysis Matrix Inversion technique, commonly used for industrial applications. An existing Optimal Sensor Placement strat...

In this paper the transmission error and the strain field are analysed for two gear pairs, with different lightweight designs, reflecting the common industrial practice. The methodology used for the analysis is based on a hybrid FE-Analytical approach implemented in a multibody solver which allows to achieve a good accuracy with a low computational...

Der Bericht ist ausschließlich als PDF-Dokument erschienen! Drei Konferenzen in einer, auf 1.874 Seiten finden Sie jede Menge aller neueste Informationen zum Thema Gears. Die beiden anderen Konferenzen waren: 3rd International Conference on High Performance Plastic Gears 2019 und 3rd International Conference on Gear Production 2019 Achtung: Dieser...

Der Bericht ist ausschließlich als PDF-Dokument erschienen! Drei Konferenzen in einer, auf 1.874 Seiten finden Sie jede Menge aller neueste Informationen zum Thema Gears. Die beiden anderen Konferenzen waren: 3rd International Conference on High Performance Plastic Gears 2019 und 3rd International Conference on Gear Production 2019 Achtung: Dieser...

An analytical model that allows for a computationally efficient analysis of face-milled spiral bevel gears, is presented. The methodology builds on the consideration that the mating tooth flanks are designed to transmit motion in a nearly conjugate manner. A multibody approach to tooth contact analysis is proposed that assumes contact between rigid...

In the automotive sector the knowledge of so-called Wheel Center Loads (WCLs), i.e. the loads acting on the center of the vehicle wheels, is required in order to perform durability analyses. Those loads, which are due to the interaction with the road, are indeed the principal cause of damage to the vehicle structural integrity and correctly quantif...

Recently a methodology was presented to obtain gear tooth flanks of spiral bevel gears with zero unloaded transmission error. The gear tooth flanks differ from those of classical face-cut spiral bevel gear elements. The presented work focuses on the loaded tooth contact analysis of the proposed gear pair by means of nonlinear finite element simulat...

As the vibro-acoustic requirements of modern products become more stringent, the need for robust identification methods increases proportionally. Sometimes the identification of a component is greatly complicated by the presence of a supporting structure that cannot be removed during testing. This is where substructure decoupling finds its main app...

Design engineers of gear boxes may recall from past projects the tedious process to model and parameterize their gear box in a multibody simulation environment. An expert user needed to spend up to several days to just to create a correct model. It is only after that milestone that the value-added time of design engineers begins: enabling him/her t...

In this paper we present a novel method to efficiently solve gear contact simulations in a flexible multi-body environment. Semi-analytical contact approaches have been recently used in Finite Element (FE) simulations for describing the displacement field in the contact zone and eliminating the need for highly refined FE meshes. In the proposed met...

Simulation models are the basis of modern product design engineering. Extending their application to the testing phase opens new opportunities for test data exploitation and allows measuring previously unmeasurable quantities and designing reduced test configurations. A common workflow is followed: a validated multiphysics system model provides a p...

In this work we present a novel method for the solution of gear contact problems in flexible multi-body. These problems are characterized by significant variation in the location and size of the contact area, typically requiring a high number of degrees of freedom to correctly capture deformation and stress fields. Therefore fully dynamic simulatio...

The knowledge of external loads acting on a vehicle is necessary in order to perform design analysis. While performing durability analysis for instance, the encountered loads due to the interaction with the road have to be known. Specific physical devices are normally used by test engineers in order to measure those quantities, but these devices ha...

Latest trends in the industry of mechanical transmissions demands for a new set of design tools, able to work beyond the assumption of the traditional analytical formulation. Recent progress in the field of model order reduction schemes finally made feasible to deal with dynamic 3D simulations of contact problems for both gears and bearing componen...

Recent trend in the field of mechanical engineering designs promote the use of flexible multibody dynamics simulations as a crucial tool, in order to perform the required design analysis, especially when dealing with contact problems. Although parametric model order reduction techniques demonstrated great potential to deal with contact simulations,...

Gearbox failure is among the highest causes of downtime in a wind turbine, causing a significant loss to the wind energy sector, especially in the complex offshore environment. Quite often, the cause of these gearbox and drivetrain errors, as well as other undesired noise and vibrations issues, is premature bearing failure. Therefore, developing mo...

Durability testing and customer load acquisition campaigns typically involve a large amount of load sensors, which in many cases are expensive, intrusive and difficult-to-instrument. This work investigates an efficient alternative procedure, which consists of using less expensive, " easier " sensors in combination with a numerical model of the syst...

Input force evaluation is always a crucial step for the adequate design of any kind of mechanical system. Direct measurements of input forces typically involve devices that are expensive, intrusive or difficult to calibrate. This is also the case for Road Load Data Acquisition (RLDA) testing campaigns, where the loads due to the road excitations ac...

Input force evaluation is always a crucial step for the adequate design of any kind of mechanical system. Direct measurements of input forces typically involve devices that are expensive, intrusive or difficult to calibrate. This is also the case for Road Load Data Acquisition (RLDA) testing campaigns, where the loads due to the road excitations ac...

Stochastic analysis of flexible multibody system for uncertain parameters typically requires a large number of simulation runs for example for Monte-Carlo simulation. However, as the computational load of a regular flexible multibody model is typically rather high, this is often infeasible. A solution to this high computational load is model reduct...

This work presents a semi-analytic approach that allows to efficiently solve the large sliding or rolling contact problems characteristically associated with the dynamic simulation of flexibly supported ball bearings. The approach separates the bulk deformation, represented by a reduced order model, and the analytically described nonlinear local He...

Modern wind turbines are designed to cope with their increased size and capacity. One of the most expensive components of these machines is the gearbox. Its design is more complex than a mere upscaling exercise from predecessors. The stress levels experienced by the different gear stages, the dynamic effects induced by their size and the unparallel...

This paper investigates the problem of how to use Computer-Aided Engineering (CAE) tools to properly assess the influence of vehicle body stiffness on handling performance. One of the challenges in this context is related to the accuracy of the Body-In-White (BIW) model. The amount of degrees of freedom should be minimal without losing the necessar...

During the last decade economies of scale have driven wind energy industries and policy makers towards the installment of turbines of increased size and capacity. These turbines are equipped with expensive gearboxes whose components are sub- jected to stress levels that are unparalleled in traditional gearbox design. The lack of engineering expe...

Model order reduction is frequently used to keep computational effort affordable at the expense of a minimal loss of accuracy. One particularly challenging problem that yet needs to be solved satisfactorily in this regard is the efficient treatment of time-varying multiple-input/multiple-output behaviour. Recent developments in the field of paramet...

SUMMARYA novel nonlinear parametric model order reduction technique for the solution of contact problems in flexible multibody dynamics is presented. These problems are characterized by significant variations in the location and size of the contact area and typically require high-dimensional finite element models having multiple inputs and outputs...

In view of the tendency towards ever lighter and more powerful machines and even shorter design cycles, it becomes essential to have virtual prototyping tools that allow for fast and reliable numerical simulations. Current state-of-the-art structural dynamics and flexible multibody simulation techniques usually involve the solution of matrix system...

Contact modeling is an active research area in the field of multibody dynamics. Despite the important research effort of the last decades, two main challenging issues, namely accuracy and speed, are far from being jointly solved. One main issue remains the current lack of model order reduction schemes capable of efficiently treat systems where mult...

Contact modeling is an active research area in the field of multibody dynamics. Despite the important research effort, two main challenging issues, namely accuracy and speed, are not yet jointly solved. One main issue remains which is the lack of model order reduction schemes capable to efficiently treat systems where multiple, a priori unknown, in...

This paper investigates the problem of how to use Computer-Aided Engineering (CAE) tools to properly assess the influence of vehicle body stiffness on handling performance. One of the challenges in this context is related to the accuracy of the Body-In-White (BIW) model. The amount of degrees of freedom should be minimal without losing the necessar...

Today the time-to-market in the automotive industry is decreasing whereas the quest for improvements of conflicting performance criteria (static and dynamic behavior, crashworthiness, NVH, etc.) is ever increasing. New efficient Computer Aided Engineering (CAE) tools are requested by the designer to evaluate the functionality and the quality of dif...

This paper deals with the integration of a vehicle body concept modeling methodology, based on reduced models of beams, joints and panels, with flexible Multi-body (MB) representation of the chassis of a passenger car. The aim is to enable ride and handling simulations in the initial phases of the vehicle design process, where the availability of p...

Many applications require fast and even real-time multibody simulations. Until recently, strongly simplified models were used in order to reach real-time constraints. A novel system-level model reduction technique, namely Global Modal Parameterization (GMP), enables the reduction of a complex mechanism, incorporating flexibility. This technique gro...

Body flexibility is of ever-increasing importance in multibody simulation. The current state-of-the-art simulation techniques typically have difficulties with systems in which flexible bodies can be loaded in many degrees of freedom (DOFs). However, in many applications, loading is possible in many DOFs but only few are loaded simultaneously at any...

This paper presents a methodology for an integrated analysis (based on LMS Virtual .Lab Motion and Matlab/Simulink) to perform the combined simulation of a multi-body vehicle model with mechatronic control system (i.e. ABS), running analyses of the influence of the flexibility of suspension elements during emergency braking. A rigid full vehicle mu...

This paper discusses and further investigates a new methodology, “Static Modes Switching” (SMS), improving computational efficiency for elastic multibody (EMBS) systems. This method focuses on mechanisms in which loading is possible in many degrees of freedom, but only few of them are simultaneously loaded at a given moment in time (e.g. sliding el...

The paper presents a vehicle body concept modeling methodology based on reduced models of beams, joints and panels. The aim of the approach is to enable accurate Noise, Vibration and Harshness (NVH) simulations of the vehicle Body in White (BIW) already in the initial phases of the vehicle design process, when the detailed geometry information has...

The use of Computer Aided Engineering (CAE) tools in the automotive industry is nowadays a confirmed approach to predict the various functional performance attributes (ride and handling, NVH, crashworthiness, etc.) and adapt the design based on the outcome of virtual simulations. In particular, reduction of the time to market has been one of the ma...