## 3 The Dataset  
### Data Collection Process  
In order to obtain data, a model of a hydraulic power unit (HPU) was built. The model is based on an axial piston pump, as it is one of the most popular types of pumps used in industrial installations. Pump model used is HSP10 VO45 DFR, Hydraut Europe S.R.L., Gallarate (VA), Italy. This is a nine-piston variable displacement pump with an inclined swash plate. Nominal parameters of the pump are as follows:  
* displacement: 45 cm\({}^{3}\)/rev. * max. continuous pressure: 280 bar
* peak pressure: 350 bar  
The pump cross-section is shown in Figure 1. The valve plate is marked yellow for better visualization. The cylinder block (marked blue) is the element that rotates and slides on the valve plate surface on the oil film. This allows cyclic displacement of oil by pistons from suction to the output port in the end cover of the pump. The valve plate is the element that allows cooperation between the cylinder block and end cover. It acts as a slide bearing. In the first stage of building the HPU model, a hydraulic diagram of the system was prepared, including appropriate measurement sensors. The diagram is shown in Figure 2 and all the components used in test HPU are presented in Table 1. The test HPU built for the research uses a pump (10) driven by an electric motor (3). As a load for the pump, a hydraulic motor (14) was used. Further, motor (14) was driving another electric motor (16), which was acting as an adjustable brake for which a specific torque value could be set. The torque value was measured by a torque meter (15). Process parameters for the pump were measured by temperature (1, 4, 8), pressure (2, 5, 9) and flow (6, 11) sensors. Check valve (7) is used as a safety relief valve for the pump leak port in case of flow-meter (6) clogging. Temperature and pressure sensors (12, 13, 18, 19) for hydraulic motors (14) are used for diagnostic and safety monitoring purposes. As a standard element in hydraulic systems, a return oil filter (17) is also used. The electric motor working as a brake is powered by a frequency inverter, which is then controlled by a PLC controller and a computer system. The test unit is shown in Figure 3.  
The built model allows the collection of data both for correct operating and damaged condition pumps. \begin{table}
\begin{tabular}{c l l l} \hline \hline
**Pos.** & **Description** & **Symbol** & **Manufacturer** \\ \hline
1 & Temperature sensor Pt1000 150 \({}^{\circ}\)C & TA2105 & IFM, Germany \\
2 & Pressure sensor \(-1\dots 1\) bar & PA3509 & IFM, Germany \\
3 & Electric motor 37 kW & FCOMP 225S-4/PHE & AC-Motoren, Germany \\
4 & Temperature sensor Pt1000 150 \({}^{\circ}\)C & TA2105 & IFM, Germany \\
5 & Pressure sensor 400 bar & PT5400 & IFM, Germany \\
6 & Turbine flow meter & PPC-04/12-SFM-015 & Stauff, Germany \\
7 & Check valve & SSA1.0 & Ponar, Poland \\
8 & Temperature sensor Pt1000 150 \({}^{\circ}\)C & TA2105 & IFM, Germany \\
9 & Pressure sensor 10 bar & PT5404 & IFM, Germany \\
10 & Piston pump & HSP10 VO45 DFR & Hydraut, Italy \\
11 & Gear wheel flow meter & DZR-10155 & Kobold, Germany \\
12 & Temperature sensor Pt1000 150 \({}^{\circ}\)C & TA2105 & IFM, Germany \\
13 & Pressure sensor 10 bar & PT5404 & IFM, Germany \\
14 & Hydraulic motor & F12 060 MF & Parker, USA \\
15 & Torque meter & T22/1 KNM & HBM, Germany \\
16 & Electric motor 170 kW & LSRPM250 ME1 & Emerson, USA \\
17 & Filter & FSI & Ponar, Poland \\
18 & Pressure sensor 250 bar & PT5401 & IFM, Germany \\
19 & Temperature sensor Pt1000 150 \({}^{\circ}\)C & TA2105 & IFM, Germany \\ \hline \hline \end{tabular}
\end{table} 
Table 1: HPU components. Figure 1: Pump cross section. Source: [[https://www.ponar-wadowice.pl/tuploads/attachments_prod/hg_metaris_ma10](https://www.ponar-wadowice.pl/tuploads/attachments_prod/hg_metaris_ma10) vo_technicalcatalog_web.pdf]([https://www.ponar-wadowice.pl/tuploads/attachments_prod/hg_metaris_ma10](https://www.ponar-wadowice.pl/tuploads/attachments_prod/hg_metaris_ma10) vo_technicalcatalog_web.pdf) (accessed on 25 June 2024).