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Articles by Martti Saarilahti

Category: Article

article id 5477, category Article
Martti Saarilahti. (1992). Skidding by sulky - a literature study. Silva Fennica vol. 26 no. 2 article id 5477. https://doi.org/10.14214/sf.a15638

Speed and load sizes presented in three study reports on sulky skidding were compared with estimates based on ergonomic models. Speed and load size estimates were closely correlated with the observed values, when a 400 W energy expenditure of the subject was used. This corresponds to less than half of his submaximal oxygen intake and matches well with the heart rate given in one of the time studies. It seems possible to develop methods for evaluating the work pace/production rate for sulky skidding in varying terrain conditions.

The PDF includes an abstract in Finnish.

  • Saarilahti, ORCID ID:E-mail:
article id 5340, category Article
Martti Saarilahti. (1988). Development in techniques for studying forest roads on peatlands. Silva Fennica vol. 22 no. 1 article id 5340. https://doi.org/10.14214/sf.a15497

A light seismic method, a short-pulse radar and a microwave probe are tested in assessing the properties of a forest road constructed on peatland. The light seismic method gave reliable values for estimating the bearing capacity of the road. It was found that bearing capacity was mostly dependent on embankment thickness, but quality of fabric might also have an influence. Embankment thickness and peat depth can be measured on the radiogram, and some additional information on road bed and peat obtained. The microwave peat probe permits recording of the continuous moisture profile in situ, which improves accuracy of planning.

The PDF includes a summary in Finnish.

  • Saarilahti, ORCID ID:E-mail:
article id 5308, category Article
Martti Saarilahti, R. E. L. Ole-Meiludie. (1987). Production rate and work strain on workers in cutting of pines in Tanzania. Silva Fennica vol. 21 no. 1 article id 5308. https://doi.org/10.14214/sf.a15465

A team of 2 experienced workers was time-studied and their heart rate recorded under 4 days in clearcutting of a highly self-pruned Pinus patula Schltdl. & Cham. plantation. Task work and bonus payment systems were compared, but there was no difference in production rate, only the workplace time was extended from 2.3 h/d in task work to 3.9 h/d in bonus payment. The heart rate was 115–116 P/min in felling, 105–109 P/min in debranching and 109–114 P/min in bucking. The average heart rate in timber cutting was 108–109 P/min. Work load index was 34–37%, and the workers did not show any symptoms of accumulated stress. The production rate was 3.2 m3/h, (WPT, crew), which corresponds average piecework rate, the comparable walking speed being about 6.0 km/h. There are possibilities to increase the daily task by ergonomic grounds.

The PDF includes an abstract in Finnish.

  • Saarilahti, ORCID ID:E-mail:
  • Ole-Meiludie, ORCID ID:E-mail:
article id 5156, category Article
Martti Saarilahti. (1982). Tutkaluotaukseen perustuva metsäautotien kantavuuden arvioimismenetelmä. Silva Fennica vol. 16 no. 1 article id 5156. https://doi.org/10.14214/sf.a15071
English title: Predicting the bearing capacity of forest roads using a radar sounding.

Good correlation between radar reflection depth when using a FM-CW radar during winter and bearing capacity measurements during spring breakup was found. Therefore, it might be possible to evaluate the bearing capacity of forest roads using the radar sounding technique.

The PDF includes a summary in Finnish.

  • Saarilahti, ORCID ID:E-mail:
article id 5130, category Article
Martti Saarilahti. (1981). Mikroaaltotutka jään paksuuden mittaukseen. Silva Fennica vol. 15 no. 4 article id 5130. https://doi.org/10.14214/sf.a15187
English title: Radar measurement of ice thickness on ice roads and landing.

Light and economic FM-CW radar has been developed for controlling the bearing capacity of ice roads and landings on ice used for timber transportation and storage of timber in Finland. It was tested on natural ice and ice roads of three lakes in Southern Finland and one location on sea on the southren coast of Finland (a total of 166 observations). Ice thickness varied from 0 to 100 cm. Correlation coefficient between auger and radar measured ice thickness was r=0.99 and absolute error varied from -10 to +7 cm. The quality of ice had no influence, but by improving the interpretation of results, also the quality factors might be detected.

The PDF includes a summary in Finnish.

  • Saarilahti, ORCID ID:E-mail:
article id 5126, category Article
Martti Saarilahti. (1981). Koneiden uppoaminen suometsien puunkorjuussa. Silva Fennica vol. 15 no. 3 article id 5126. https://doi.org/10.14214/sf.a15067
English title: Sinkage of forest machines during harvesting operations on peatlands.

Questionnaires were sent out to determine the volume of wood harvested from peatlands during 1978 and the harvesting problems encountered. In total there were 110 responses which accounted for 8 million m3 of wood harvested, of which 1.0 million m3 (14%) was harvested from peatlands. The largest proportion of wood harvested from peatlands was during the winter. Most of the respondents reportet that they wait for the soil frost to set before harvesting is started on peatlands. Respondents indicated a total of 263 machines bogging down in to the soil or, for 1978, a total for Finland of 750 to 1,000 machines.
The PDF includes a summary in English.

The PDF includes a summary in English.

  • Saarilahti, ORCID ID:E-mail:
article id 4994, category Article
Martti Saarilahti. (1978). Seismisten luotausmenetelmien soveltuvuus metsäautoteiden pohjatutkimuksiin. Silva Fennica vol. 12 no. 2 article id 4994. https://doi.org/10.14214/sf.a14848
English title: Seismic survey methods in forest road construction.

The aim of the study was to find out the technical and economical applicability of seismic survey methods of sub-surface earth investigations in forest road planning. Two seismographs, SOIL-TEST MD 1 and BISON 1570, were tested in studyin 31 cuts and 3 gravel areas. The devices proved to be usable in field conditions. Sounding one spot costs about 75 Fmk and methods’ rentability is greatly based on the ration between expected and unexpected events, which depends on the areal geology. It is profitable to purchase the device especially if digging out of unexpected bedrock causes high costs.

The PDF includes a summary in English.

  • Saarilahti, ORCID ID:E-mail:
article id 7623, category Article
Martti Saarilahti. (1982). Tutkimuksia radioaaltomenetelmien soveltuvuudesta turvemaiden kulkukelpoisuuden arvioimiseen. Acta Forestalia Fennica no. 176 article id 7623. https://doi.org/10.14214/aff.7623
English title: Studies on the possibilities of using radar techniques in detecting the trafficability of peatlands.

The possibilities of using microwave techniques in detecting the trafficability of peatlands is discussed. Three microwave methods were tested. 1) A FM-CW radar using 1.01.8 GHz frequency was used to measure the frost thickness of peat layer. It was possible to follow the variations in snow and frost layer thickness. Total reflected power might indicate the wetness class of the peatland, which is also a trafficability factor. 2) A short-pulse radar with 100 MHz frequency was tested in summer condition. Good profiling of peat layers was obtained, giving basic information for trafficability analysis. 3) A mapping of brightness of temperature of peatlands in summer conditions using a 790 MHz radiometer. The measured brightness temperature was correlated with vegetation cover, thus giving some information of trafficability.

The PDF includes a summary in English.

  • Saarilahti, ORCID ID:E-mail:

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