Tuomo Lindh

Lappeenranta – Lahti University of Technology LUT · Department of Energy

Hybridization of non-road mobile machinery offers benefits for energy efficiency and decarbonization tasks. Hybrid electric power trains combine combustion engines with electric machines and batteries. Thus, it is important to model engine dynamics accurately so that the operation of different kinds of power train systems can be controlled and opti...

Tower cranes are needed to move heavy objects safely around construction sites. In tower cranes, payload oscillations are a typical problem that can cause safety issues, especially if the crane is not operated by an experienced user. Depending on the system, there are different causes for oscillations, e.g., inertial forces from the crane movement...

In this paper, different power balance control methods for hybrid marine vessels are analyzed. First, the power grid of a marine vessel is modeled using MATLAB and Simulink. Simulations are then performed using real power plant load data captured from an actual vessel. Isochronous control is used to control the power of the diesel gensets, and diff...

Electrification of non-road mobile machinery holds immense potential for reducing the high emissions and fuel consumption of such industrial machinery. Detailed real-time physics-based simulation models capable of comparing energy efficiencies of hybrid powertrains in realistic working conditions can aid the development of efficient mobile machiner...

Hybrid powertrains that combine electric machines and internal-combustion engines offer substantial opportunities to increase the energy efficiency and minimize the exhaust emissions of vehicles and nonroad working machines. Due to the wide range of applications of such powertrains, simulation tools are used to evaluate and compare the energy effic...

The tightening of emission standards and related regulations leads to the necessity of the hybridization of mobile machines. The working operation profile of non-road machinery differs for diverse application types and often varies on large scale. Since the series production of mobile vehicles is generally relatively limited, their design can be ta...

This paper proposes a generally applicable method of optimizing the power and energy balance of the main vessel producer and consumer units. The method is also used after an equipment failure as part of the power management process flow. The method proposes that the route plan is divided into distance steps and an optimization algorithm is used to...

The decarbonization, digitalization and automation of global shipping are intensifying due to high pressure and need from the regulatory, environmental, economic and technological perspectives. The INTENS project is one of the ongoing Finnish major R&D efforts towards smart and green shipping, which is an industry-wide collaborative research and in...

Step response-based identification is important topic related to modern process control and diagnostics. Although there are several adequate identification methods available, namely graphical and computational techniques, still there is increasing requirement to develop methods for the diagnostics of electric drives. Particular importance can be fo...

The global food demand is projected to significantly increase. To maintain global food security in the future, protein production needs to become more efficient regarding the use of limited land and water resources. Protein-rich biomass can be produced via direct air capture of CO2 with the help of H2-oxidizing bacteria and renewable electricity in...

The global marine cluster is in major transition to smart and green shipping. The pressure and need for the decarbonization, digitalization and automation in shipping are high from regulatory, environmental, economic and technological perspectives, which poses challenges and opportunities to the cluster. It is imperative for Finland since the hi-te...

Horizontal vacuum belt filters are used for continuous solid–liquid separation in a wide variety of industrial processes. Despite the low pressure difference (usually Δp < 0.8 bar), the high air pumping requirement to maintain the pressure difference results in considerable energy consumption. In this article, the specific energy consumption of vac...

Application of energy storages (ES) in power distribution systems (PDS) of short sea shipping marine vessels is gaining ground. The main drivers are the increasing demand for higher energy efficiency and the decreasing costs of battery energy storage systems (BESS). The feasible chemistry and dimensioning of the BESS depend heavily on the vessel ty...

Many manufacturing processes depend on accurate multi-axis movements. Development of drive technology has replaced the need of mechanical couplings and cams in synchronized manufacturing operations. In this paper motion synchronization of a biaxial linear tooth-belt drive is studied and, especially, the effects of the data communication's speed bet...

Driveline resonances are one of the major reasons for poor vehicle drivability, passenger discomfort, and premature wear of the mechanical parts of the driveline. Adequate models generated by system identification are essential, for instance, in order to analyze resonances, and especially, to design solutions to mitigate these adverse effects by me...

The energy consumption of vacuum filtration operations in cake filtration depends on the properties of the cake, the filtration conditions applied, and the progress of the cake dewatering process. Operating a vacuum filter at a high pressure difference requires a high air flow rate and thus has high energy consumption. By taking the filtered solids...

A proper real-time system identification method is of great importance in order to acquire an analytical model that sufficiently represents the characteristics of the monitored system. While the use of different time-domain online identification techniques has been widely recognized as a powerful approach to system diagnostics, the frequency-domain...

Some of the most widely recognized online parameter estimation techniques used in different servomechanism are the extended Kalman filter (EKF) and recursive least squares (RLS) methods. Without loss of generality, these methods are based on a prior knowledge of the model structure of the system to be identified, and thus, they can be regarded as p...

An electrical and mechanical design process for a traction motor in a hybrid bus application is studied. Usually, the design process of an electric machine calls for close cooperation between various engineering disciplines. Compromises may be required to satisfy the boundary conditions of electrical, thermal, and mechanical performances. From the...

The interest in using hybrid technology in Non-Road Mobile Machinery (NRMM) has increased significantly in the late 2000s due to tightening emission regulations (Tier 4). In general, utilization of hybrid technology can simplify the vehicle driveline compared to conventional mechanical and hydraulic power transmissions. On the other hand, hybrid te...

This study introduces indirect water cooling systems and their improvements utilized in proto typing of vehicle machines. Due the vehicle machines require high torque at acceleration they are often equipped with indirect liquid cooling. One common method to implement liquid cooling is a water jacket inside machine frame as well as on the end plates...

This paper presents a novel method to generate surface dynamometer cards of a sucker rod pump by applying torque and rotational speed estimates of a variable speed induction motor drive and a pumping process identification run.

Four methods for estimating chipping quality or chip length in a rough turning process are compared in this paper. In two of the methods, chip break frequency is detected from the spectrum of the acoustic emission signal. In the third, chip length is analyzed based on features in a time domain signal. And in the final method, the statistics of the...

Tooth belt drives with directly connected permanent magnet servo motors are mechanically very flexible systems, and the resonances of the system change significantly as function of cart position and load. This paper addresses issues in identification of a linear tooth belt-drive with limited stroke. Particular attention is paid to detecting the cha...

Chatter is an unfavorable phenomenon in turning operation causing poor surface quality. Active chatter elimination methods require the chatter to be detected before the control reacts. In this paper, a chatter detection method based on a coherence function of the acceleration of the tool in the x direction and an audio signal is proposed. The metho...

This paper analyzes the functionality of a sensorless traction control system for hydrid electric vehicle. The traction control system was developed using a multibody dynamics simulator, and it is based on a fuzzy logic controller. The system is introduced and the functionality is then verified by using an experimental vehicle. Simulation results f...

This paper discusses the problems that arise when analyzing mechatronic systems that are driven by controlled electrical drives. Both the drive and mechanics contribute to the dynamics including various sources of nonlinearities and time-varying components. The paper discusses various different means of simulating such systems, with a special refer...

Designing the drive train for a hybrid working machine necessitates totally new methods compared to traditional diesel operated working machine design as dimensioning the diesel, the energy storage and the electric drive is much more complicated than just selecting the diesel according to the peak power demand as in traditional ICE drives. Preparin...

This paper focuses on the control developing for directly connected energy storage (ES) in diesel electric vessel drives and on analysis of the application benefits. The energy storage reduces load variations of diesel and generator. This can lead to fuel consumption savings, especially during dynamic positioning mode of offshore supply vessel. Ene...

This paper considers stability issues in a low-voltage direct current (LVDC) electricity distribution network with a directional power flow. The network is based on power electronic devices, which bring a well-known instability factor, that is, negative impedance to the system. Each network inverter is designed to be stable when operating alone and...

This paper presents a new method to improve cutting efficiency for steel rough turning. To date, most efforts aimed at improving productivity during cutting operations have concentrated on optimizing material handling to and from the machinery. Here, the focus is on improving the efficiency of the turning operation itself. The approach is to contro...

This research project developed an adaptive chip control system for rough turning. Continuous chips are detected with the help of acoustic emission signals during machining. The system monitors the breaking of chips, estimates the length of the chips and eliminates continuous chips if those are formed by stopping the feed and then restarting it at...

Abstract— Small scale or micro scale hydroelectric power production is characterized by high investment costs compared to operation costs. In addition, the repayment time is often long, more than ten years (if not subsidized heavily) which requires that a small-scale hydropower plants can be profitable only if both the investment costs and the runn...

Pump drives account for nearly a quarter of the electric energy consumption in the European industry (Almeida and Fonseca, 1997). Furthermore, their reliability has a strong impact on the production in paper industry. Hence, the optimization of energy consumption and maintenance can lead to substantial cost savings. By applying pump drive life cycl...

This paper discusses the requirements set to permanent magnet generators directly connected to electrical network especially when used in hydro electric plants. The influences of the requirements on the permanent magnet generator design parameters are discussed.

A prototype of a wireless ZigBee-based torque sensor for underwater power generator was built and installed. The torque measurement is implemented using strain gages. A measuring unit and strain gages are rotating with the rotor and sending measurements over wireless ZigBee link to the receiver unit located at the stator. The measurements are sent...

In this paper we compare different remote controlling methods for a small-scale hydropower plant in terms of cost efficiency, complexity and capability to provide information. In addition, requirements of each solution for hardware software and communication media are discussed. Examples of different solutions are presented by implementations in la...

information. In the utility sector, many enterprises provide services that allow customers to analyse their energy consumption and billing data. Web-based services can also be used for the collection of measurement data and for the control of devices. The implementation of services connected to actual processes of an industrial company sets quite m...

Rotating machinery maintenance cost is a signifi- cant part of total expenses of industrial plants. Current needs to reduce such expenses has risen the importance of condi- tion monitoring. Condition monitoring and diagnostics allow the maintenance that is based on current condition instead of the maintenance based on statistically estimated lifeti...

Diss. -- Lappeenrannan teknillinen yliopisto.