A5102979758- Remote Sensing and LiDAR Applications
- Forest ecology and management
- Forest Ecology and Biodiversity Studies
- Magnetic Bearings and Levitation Dynamics
- Tribology and Lubrication Engineering
- Gear and Bearing Dynamics Analysis
- Structural Health Monitoring Techniques
- Remote Sensing in Agriculture
- Advanced Measurement and Metrology Techniques
- Machine Fault Diagnosis Techniques
- Hydraulic and Pneumatic Systems
- Vibration Control and Rheological Fluids
- Image Processing and 3D Reconstruction
- 3D Surveying and Cultural Heritage
- Botany and Plant Ecology Studies
- Ecology and biodiversity studies
- Marine and coastal ecosystems
- Fish Ecology and Management Studies
- Forest Management and Policy
- Mechanical Failure Analysis and Simulation
- Geology and Paleoclimatology Research
- Surface Roughness and Optical Measurements
- Control Systems in Engineering
- Modeling, Simulation, and Optimization
- Freshwater macroinvertebrate diversity and ecology
Häme University of Applied Sciences
2009-2025
Aalto University
2018-2021
Airborne scanning LiDAR is a promising technique for efficient and accuratebiomass mapping due to its capacity direct measurement of the three-dimensionalstructure vegetation. A combination individual tree detection (ITD) an area-basedapproach (ABA) introduced in Vastaranta et al. [1] map forest aboveground biomass(AGB) stem volume (VOL) was investigated. The main objective this study totest usability accuracy biomass mapping. nearest neighbourmethod used ABA imputations estimation...
<ja:p>In this paper we examine the feasibility of data from unmanned aerial vehicle (UAV)-borne imagery in stand-level forest inventory. As airborne sensor platforms, UAVs offer advantages cost and flexibility over traditional manned aircraft remote sensing applications small areas, but they lack range endurance larger areas. On other hand, advances processing digital stereo photography make it possible to produce three-dimensional (3D) canopy on basis images acquired using simple...
During the last few decades organic matter concentrations and water colour values have increased in a large number of lakes rivers Eurasia North America. The upward shift colour, often called browning, shortage mobile cations been linked to recovery catchments from acid deposition precipitation. Here, long-term chemistry responses 33 boreal forest atmospheric catchment scale drivers were studied small drainage basin southern Finland. longest data series cover four starting 1979, thus include...
Abstract Airborne laser scanning (ALS) has been used in recent years to acquire accurate remote-sensing material for carrying out practical forest inventories. Still, much of the information needed management planning must be collected field. For example, proposals are often determined field by an expert. In present study, statistical features extracted from ALS data were logistic regression models and nonparametric k-MSN estimation predict thinning maturity stands. The research consisted...
Mass unbalance is one of the most prominent faults that occurs in rotating machines. The identification case large flexible rotors crucial because industrial applications such as paper machines and roll grinders, high vibrations can adversely affect quality end product. objective this research to determine location, magnitude phase for a rotor with few measured coordinates. To end, an established force-based method comprising modal expansion equivalent load minimization applied. Due...
The mounting of a rotating machine affects the dynamic behavior machine. Typically in large machines, support structures have lower stiffness on actual site than acceptance tests conducted by manufacturers. In this research, method is developed for identification an in-situ using simulation-data-driven, deep learning algorithm. novel approach aims to utilize transfer first teach algorithm vibration response data generated from simulation model rotor-bearing-support system, and then test it...
Vibration problems have been observed after the installation of large rotating machines, such as electric machines and generators paper machine rolls. One possible cause can be differences between foundation stiffness location testing platform where is balanced optimized. Foundation exerts a significant effect on behavior system, above-mentioned major unexpected changes at natural frequencies, thus resonance. The problem typical for due to their mass, which leads low frequencies. This...
The thickness variation of a large bearing ring is an important measure effecting on the rotational accuracy and partly defining dynamic properties bearing. For example, when inner installed rotor shaft, final roundness profile sum shaft variations possible conical adapter sleeve. In present study, device method for measuring roller element rings was presented. To enhance measurement quality, each consisted 20 rounds data, which were averaged in frequency domain after Fast Fourier Transform....
Large rotating machinery is prone to subcritical vibration. One of the most critical excitations at that frequency range bending stiffness variation, which excites rotor two times per revolution and leads resonance half speed. The excitation variation a result uneven material distribution, if otherwise linearly elastic homogeneous. In this research, these assumptions are made, focus on effect cross-sectional distribution variation. analytic study, artificially generated profiles were used...
To achieve acceptable dynamical behavior for large rotating machines operating at subcritical speeds, the balancing quality check planned service speed in installation location is often demanded such as turbo-generators or high-speed machines.While most studies investigate critical only a few have investigated this aspect using numerical methods operational speed.This study proposes novel, model-based method inversely estimating initial residual unbalance one and two planes after grade...
In the paper industry, dynamic characteristics of flexible rotors has been widely investigated for decades. Rotor vibrations induce noise, decrease lifespan bearings, produce additional load to structures, and can directly affect end product as in a production. Therefore, vibration must be avoided reduced its minimum.Accelerometers are commonly used measure frequencies amplitudes vibrations. Anyway, accelerometers not capable detecting forces like periodic radial bearing created by rotor...
Bending stiffness variation (BSV) is a common problem causing vibration in large rotating machinery. BSV describes lateral bending and its as function of the rotational angle. It has been observed that causes excitation exactly twice per revolution, which leads to problems, especially at half critical speed. caused by rotor geometry errors if material assumed be homogeneous linearly elastic. Therefore, study investigated with harmonic roundness components, are commonly used industry describe...
Constant rotor system monitoring enables timely control and maintenance actions that decrease the likelihood of severe malfunctions end product quality deficits. Soft sensors represent a promising branch solutions enhancing monitoring. A soft sensor can substitute malfunctioning physical provide estimates quantity is difficult to measure. This research demonstrates based on bidirectional long short-term memory (LSTM), training procedure for at high sampling frequency varied operating...