Marcello Vanali

Marcello Vanali
Università di Parma | UNIPR · Department of Engineering and Architecture

PhD in Applied Mechanics

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100
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825
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Publications

Publications (100)
Chapter
Palazzo Lombardia is one of the tallest buildings in Milan and the site of the regional government. For these reasons, some years ago a monitoring system was installed in order to assure its continuous operation. The system is based on accelerometers and clinometers at different floors used for dynamic and static monitoring, respectively. A statist...
Article
This article addresses the estimation of the effects of human-structure interaction on the dynamic behaviour of slender structures. The paper proposes a method able to provide predictions of human-structure interaction effects in cases in which no models of human dynamic behaviour can be used/are available and only experimental data have to be used...
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Many studies in the literature have already evidenced that pedestrians are able to change the dynamic properties of slender structures (e.g., footbridges and staircases). The aim of this paper is to analyse which pedestrians’ features mostly affect the structure behaviour, in order to properly account for them in a human–structure interaction probl...
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p class="Abstract">Characterising the aeroacoustic noise sources generated by a rotating wind turbine blade provides useful information for tackling noise reduction of this mechanical system. In this context, microphone array measurements and acoustic source mapping techniques are powerful tools for the identification of aeroacoustic noise sources....
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One way to enhance the performance of vibration control with piezoelectric shunt is to use a negative capacitance in the shunt circuit. This component is very effective and provides good results in terms of attenuation improvement without significantly increasing the complexity of the shunt network. However, negative capacitances are built using op...
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The knowledge of the modal capacitance and electro-mechanical coupling factor is essential for a proper design of systems with embedded piezoelectric transducers and materials. In light of this, this paper presents two indirect methods for measuring the piezoelectric modal capacitance and a method to estimate the modal electro-mechanical coupling f...
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This paper shows how to enhance the vibration attenuation obtained by means of piezoelectric resistive shunt coupled to the use of negative capacitances. This improvement is achieved by adding an inductance in the shunt circuit. This additional inductance is not used to the usual purpose of mono-modal control, but to improve the attenuation in a br...
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This paper addresses the vibration attenuation provided by the resonant piezoelectric shunt enhanced by means of negative capacitances. The shunt impedance is composed by one or two negative capacitances, a resistance and an inductance. It is shown that closed analytical formulations, common to all the possible connections of the negative capacitan...
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There are many advanced algorithms used to estimate modal parameters. In this paper, the modal parameters extracted from the Poly-reference Least Squares Complex Frequency (PLSCF) algorithm and the Multi-reference Ibrahim Time Domain (MITD) algorithm, are compared. The former, is widely used in the industry and is known to produce almost crystal cl...
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This paper deals with the monitoring of Palazzo Lombardia, one of the tallest skyscrapers in the city of Milan. The monitoring system collects both dynamic and static data in order to assess the health condition of the whole structure. Accelerometers are used for collecting dynamic data, while static data are obtained from clinometers. Moreover, en...
Article
A new experimental apparatus for performing impact tests is presented, to analyse the wave propagation phenomenon in pure sand and in composite sand-polyurethane specimens, with the final aim to explore the seismic mitigation given by a polyurethane inserted into a real soil under existing structures. Polyurethane layers at three different thicknes...
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This paper addresses a new approach for mono-modal vibration reduction by means of a piezoelectric shunt. It is based on an innovative shunt impedance which allows to improve the attenuation performance and the robustness to mistuning compared to the use of the classical resonant shunt. This result is achieved by building a network, composed of two...
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A wind turbine foundation has been monitored for one year in order to assess the effectiveness of a repair work carried out in 2017. A number of displacement transducers have been installed together with strain gauges and accelerometers to understand the turbine dynamic behavior. One year of data is now available coupled with the machine working pa...
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This paper presents a general approach for modelling human–structure interaction in the case of vertical vibrations that is based on a model of the system and on a solution procedure that is able to account for the most complex dynamic conditions, such as people ascending/descending light staircases. The approach combines the effects of changes in...
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Modal models from operational modal analysis (OMA) lack information about the modal scaling (or, modal mass). Many times, this is not a limitation. However, in some engineering applications, e.g. for structural health monitoring or computational model validation, a scaled modal model may be important. The authors of this paper recently presented a...
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This article deals with the design of an innovative adaptive multi-modal tuned mass damper able to change its eigenfrequencies to recover shifts of the natural frequencies of the primary system which needs to be damped. This is accomplished using systems of shape memory alloy wires connected to a number of masses equal to the number of modes to be...
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Methods for scaling mode shapes determined by operational modal analysis (OMA) have been extensively investigated in the last years. A recent addition to the range of methods for scaling OMA mode shapes is the so-called OMAH technique, which is based on exciting the structure by harmonic forces applied by an actuator. By applying harmonic forces in...
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This article addresses piezoelectric shunt damping through a resonant shunt associated with negative capacitances. The main objective of this article is to provide guidelines for choosing the best electrical circuit layout in terms of control performance and possible stability issues. This article proposes general analytical formulations for the tu...
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In this work, the mechanical power transferred from the main gearbox to the cabin of a helicopter is obtained experimentally and used as an input to the vibroacoustic model of the fuselage for interior noise prediction. The estimation of the transmitted mechanical power is based on the experimental evaluation of the coupled mechanical mobility and...
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This paper discusses the monitoring of Palazzo Lombardia, one of the tallest high-rise buildings in Italy. First, the layout of the monitoring system is addressed for a general description of the sensors used. The paper provides details about how data coming from transducers are used. Special focus is put on the use of signals acquired by means of...
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This paper proposes a new model for describing the effect of people on the dynamic behaviour of slender structures. The influence of people is described by using the so-called ground reaction forces. These are split into two types: passive ground reaction forces and active ground reaction forces. This enables to model the influence of both passive...
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This article presents a frequency response coupling technique for the prediction of the complex mechanical power in multi-point-connected structures. The motivation of this study originates from a real industrial application case concerning the evaluation of the power transmission from a large machine (source) to a flexible structure (cabin/receive...
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Structural damage identification is a coral and challenging research topic. Research mainly focuses on identification and detection of linear damage in structures by using modal parameters such as change of natural frequency, frequency response function, mode shape, etc. Transmissibility is conventionally defined as the spectra ratio of two measure...
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This paper addresses a new method for estimating axial load in tie-rods using indirect measurements. This information is of great importance for assessing the health of the tie-rod itself and the health of the entire structure that the beam is inserted into. The method is based on dynamic measurements and requires the experimental estimation of the...
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Health assessment of historical buildings by means of monitoring systems is for sure a fundamental step to preserve architectural heritage, especially for countries as Italy, rich in ancient monuments. Events such as earthquakes or severe weather phenomena constitute a major risk for these buildings because of their age and the related weakness to...
Article
People acting on a slender structure can affect the dynamic behaviour of the structure they occupy, in addition to being a source of forcing. In such cases, the use of the dynamic properties of the empty structure to estimate the structural response can lead to an erroneous estimation of the amplitudes of vibration. This work proposes an approach t...
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This work deals with the common case of large mechanical systems which can be modelled considering two main sub-structures: a source structure, corresponding for example to the engine, and a receiving structure, as the accommodation area/cabin in these machines. Numerical models are highly desired for predicting the vibroacoustic behaviour of the r...
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This paper addresses monoharmonic vibration attenuation using piezoelectric transducers shunted with electric impedances consisting of a resistance and an inductance in series. This type of vibration attenuation has several advantages but suffers from problems related to possible mistuning. In fact, when either the mechanical system to be controlle...
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The analysis of the health condition of a Renaissance Italian Dome gave us the unique possibility to study some interesting, ancient tie-rods. The engineering analysis of the efficiency of these rods enables us to draw inferences about the technological evolution of handcraft, which becomes a mirror of the attitude of the time in approaching such t...
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This paper deals with passive monomodal vibration control by shunting piezoelectric actuators to electric impedances constituting the series of a resistance and an inductance. Although this kind of vibration attenuation strategy has long been employed, there are still unsolved problems; particularly, this kind of control does suffer from issues rel...
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Expo 2015 is about to begin and the theme will be Feeding the Planet, Energy for Life. This exhibition will be focused on the nutrition issue but it is also important because of its economic benefits for the country, mainly for the development of the infrastructures necessary to support the event. For instance, one of the most strategic constructio...
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This work presents an analysis of the measured vibration levels during different events on two different grandstands of the Milano stadium (Giuseppe Meazza). The stands vibration is nowadays measured 24 h a day all year long, providing a huge quantity of data coming from ambient vibration, football matches and live rock concerts. A part of these da...
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Full-text available
It is well known that of people standing or sitting on a structure can change the dynamic behavior of the structure itself. Particularly, when a significant number of people are occupying a structure, high variations of non-dimensional damping ratios and natural frequencies are often experienced. The extent of these changes depends not only on the...
Article
Recent progresses have encouraged researchers to study and develop radar systems capable to perform dynamic measurements. The aim of this work is to investigate advantages and limitations in the use of this technique to perform dynamic measurements in the presence of multiple reflections, such as the ones generated by large civil structures. To thi...
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This work proposes a method to predict changes in modal parameters of a generic structure due to the presence of passive people. The method requires to accurately know the modal model of the empty structure, i.e. natural frequencies, damping ratios and mode shapes. No restriction on the number of degrees of freedom of the structure is required. Eac...
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Adding periodicity to structures leads to wavemode interaction, which generates pass- and stop-bands. The frequencies at which stop-bands occur are related to the periodic nature of the structure. Thus structural periodicity can be shaped in order to design vibro-acoustic filters for reducing vibration and noise transmission. The aim of this paper...
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Full-text available
The Palazzo Lombardia Tower, located at the heart of the city of Milan, Italy, recently was completed. At 161.30 m high, the new building is currently the tallest in Italy and one of the most prominent features of the city skyline for many years to come. Given the strategic importance and the strong impact of the new building, it was decided to per...
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This paper deals with semi-active vibration reduction by means of piezo-actuators shunted to time-variant impedances. Particularly, attention is focused on the Synchronized Switch Damping on Inductance technique applied to single mode control in presence of a random disturbance. Drawbacks of the mentioned method are evidenced, showing that sometime...
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This paper is concerned with the problem of identifying the tensile axial force of metallic tie-rods used in civil structures. Tie-rods are generally used to transfer a tensile force between different structural elements. Specifically in civil structures, they are often used to unburden the lateral load exercised by the vaults and arcs on walls or...
Chapter
Adding periodicity in structures leads to wavemode interaction, which generates pass- and stop-bands. Stop-bands are related to the periodic nature of the structure. Thus structural periodicity can be shaped in order to design vibro-acoustic filters to reduce vibration and noise transmission. The aim of this paper is to investigate numerically and...
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The Oglio flyover is one of three major flyovers belonging to the new BreBeMi highway in Northern Italy. The flyover consists of two separate ways, each of which made of hollow core prestressed elements with unbounded tendons, supported by hollow core circular piers. Friction pendulum isolators are used at the supports to disconnect the deck from t...
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The ‘Altra Sede’ Tower is one of the most recent buildings in Milan, but it has already become one of the strongest features of the city skyline. On 22 January 2010, an opening ceremony dedicated the skyscraper to the citizenship as the base of the ‘Regione Lombardia’ government. A helicopter landing surface was built for institutional use beside t...
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There is experimental evidence that the people interacting with structures are not only an active load but also affect the structural properties. Particularly, considerable damping ratio value changes are often experienced. This fact assumes a relevant importance in assessing the structure serviceability against vibrations due to pedestrian induced...
Article
This work proposes the dynamic analysis of a pedestrian walkway. This walkway is placed within the 'Ospedale di Circolo' Hospital complex in Varese. In order to prevent any vibration serviceability issue a dynamic analysis has been committed. Ambient vibration data and vibration data in operating conditions, that is, while people walked along the f...
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This paper deals with vibration attenuation by use of piezo-actuators connected to a Negative Capacitance circuit, generally formed by a synthetic impedance based on operational amplifiers. The goal of this paper is to investigate the means to improve vibration attenuation performances and to avoid instability applying proper choices of the values...
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This paper describes an image processing algorithm in support of infrared based nondestructive testing. The algorithm aims at analyzing the raw thermal infrared images obtained by using the nondestructive evaluation method of the laser spot thermography. In the study presented in this paper, a laser was used to scan a test specimen through the gene...
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The paper deals with the analysis and optimization of a semi-passive multi-modal vibration attenuation technique exploiting piezo-benders actuators. Although there are different methods available in the literature, attention has been focused on the current flowing technique as it has a number of advantages with respect to the other approaches. In t...
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The use of radar techniques to perform static (slowly moving) structural measurements is a well known task and most radar systems are limited to this kind of measurements. Recent progresses in this kind of techniques, however, have encouraged researchers to study and develop radar systems capable to perform dynamic measurements. The main advantage...
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In this paper the problem of human structure interaction is faced considering the case of a lightly damped steel staircase. People are a source of excitation forces and an added mass for structures but not only. It is well known human presence affects damping properties too. The aspect authors are interested in is the dependency of structure modal...
Chapter
The ‘Palazzo Lombardia’ Tower, located at the heart of the city of Milan, Italy, has been recently completed. The new building, 161.30m high, is currently the tallest in Italy, and one of the strongest features in the city skyline of the for many years to come. Given the strategic importance and the strong impact of the new building, it was decided...
Article
Noise generated by railway vehicles is nowadays one of the most important concerns in the railway engineering community and sometimes becomes one of the key points in the discussions preceding the design of a new line. Many researchers have contributed to achieve important improvements in the reduction of railway wheel noise during recent years. On...
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Slender pre-tensioned concrete structures are nowadays of common use, due to their unique features. Slender beam can be used to sustain large structures and important loads leaving the architects a lot possibilities in the structure design. The health of such structures is strictly related to the conditions of the tendon that, in many cases, are no...
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This paper deals with the study of the uncertainty associated to operational modal analysis parameter estimation. The main aim is to analyse how different key factors such as frequency resolution and average number can affect the accuracy of the estimated eigenfrequencies, non-dimensional damping ratios and mode shapes of a structure. This is consi...
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The ‘Altra Sede’ Tower, located in the heart of the city of Milan, has recently been completed. On January 22, 2010 an official ceremony marked the end of the construction phase and unveiled the new building to the citizens of Milano, a building which is currently the tallest in Italy, and one of the strongest features of the skyline of the city fo...
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This article deals with semi-passive multi-modal vibration control by means of piezo-benders, particularly on an already available method: the Current Flowing technique, which has a number of advantages with respect to the other methods presented in literature. Such a technique relies on the link between the bender and an electrical impedance, whic...
Article
Full-text available
In this paper an algorithm for the analysis of raw thermal infrared images is proposed. The images are obtained by using the nondestructive evaluation method of the laser spot thermography and aim at detecting the presence of surface defects. A laser is used to scan a test specimen through the generation of single pulses. The temperature distributi...
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Structural Health Monitoring techniques based on the study of the evolution of modal parameters aim to detect a structural modification relying on the results of a modal parameter estimation algorithm. Basically, a change in modal parameter values may indicate a structure evolution and possibly an ongoing damage situation. Beside structure changes...
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The interaction between civil structures and people has been a widely studied topic in the last years and the comprehension of the whole system dynamics is considered a valuable tool to the purpose of structural health monitoring. This paper is intended to give evidence of people effects on the modal behaviour of very lowly damped civil structures,...
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In the last years an increasing interest has been devoted to all the topics related to security and safety of people. Particular attention has been paid to health monitoring of large civil structures hosting lot of people, like high-rise buildings and stadia. The vast scientific literature confirms the possibility to relate structural health to the...
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A study was conducted to demonstrate the design of entirely new structural health monitoring (SHM) system for the Giuseppe Meazza stadium in San Siro, Milan, Italy. The study focused on on new data acquisition strategies made possible from FPGA devices and real-time controllers. The system was essential for the stadium, as it consisted of a number...
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This paper introduces a measurement technique aimed at reducing or possibly eliminating the spatial aliasing problem in the beamforming technique. Beamforming main disadvantages are a poor spatial resolution, at low frequency, and the spatial aliasing problem, at higher frequency, leading to the identification of false sources. The idea is to move...
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Full-text available
Stadia structures, like the G. Meazza in Milano, nowadays host many events that they were not originally designed for. Apart from the traditional football matches many live rock concerts and other public happenings are hosted. In this paper a comparison is made in order to classify the different kind of events in terms of vibration serviceability a...
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Motor vehicle riding comfort is mainly affected by volumetric engine inertial unbalances. Those propagate till the rider passing via engine mounts, main frame and auxiliary sub systems physically in contact with driver. On-road traction vehicle's engines are mainly characterized by transient exercise. Thus, a width frequency range of excitation occ...
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Motor vehicle riding comfort is mainly affected by volumetric engine inertial unbalances. Those propagate till the rider passing via engine mounts, main frame and auxiliary sub systems physically in contact with driver. On-road traction vehicle's engines are mainly characterized by transient exercise. Thus, a width frequency range of excitation occ...
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The interest about all the topics related to security and safety of people is increasing. In particular great attention is devoted to the health monitoring of large civil structures like high-rise buildings and sports arenas. Among these the Giuseppe Meazza is one of the biggest stadium in Italy and the municipality decided to develop and implement...
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Full-text available
During the last years the increasing reliability of OMA techniques has made ambient vibration modal testing and analysis a good tool to monitor the structural health conditions and to improve maintenance strategies. A large number of robust output-only modal identification techniques are available in the literature; among these methods, the Stochas...
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Railway noise emission and its reduction are considered among the most important topics in the future development of transportation systems, as they have a strong impact, which comes with a new line, on the people living nearby. Many elements contribute to the overall noise emission, but it has been evidenced that the most critical factor is the in...
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In the last years an increasing interest has been devoted to all the topics related to the security and safety of people. Particular attention has been paid to health monitoring of large civil structures hosting many people, such as high-rise buildings and stadiums. Some extraordinary events, such as the Millennium Bridge oscillations in London, ex...
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For many years the problem of noise generated by trains has had an increasing importance; in this paper, attention is focused on the noise generated by the train wheels due to their vibration. Today there are many kinds of railway wheels which are affected by different noise generation mechanisms. If the traditional and well known solid wheel is co...