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[b]Soyuz TMA-M manned transport vehicle of a new series[/b] Major Modifications Five new devices of the total mass of ~42 kg (instead of 6 devices of the total mass of ~101 kg) are installed in the guidance, navigation and control system of the new series vehicle. In this case GN&CS power consumption is reduced up to 105 W (instead of 402 W). Central computer (CC) with the interface device of the total mass of ~26 kg and power consumption of 80 W is used as part of GN&CS modified. The central computer capacity is 8 M operations/s, random-access memory (RAM) capacity is 2000 KB. The operation life which is 35 thou. hours is significantly increased. A 50% computer power margin is envisaged. In OMS the following is installed: 14 new devices of the total mass of ~28 kg (instead of 30 devices of the total mass of ~70 kg) at the same data rate. The mode of data exchange with OC is inserted. The OMS power consumption is reduced: in the direct telemetry information transmission mode - up to 85 W (instead of 115 W), in the record mode - up to 29 W (instead of 84 W) and in the display or reproducing mode - up to 85 W (instead of 140 W). Attendant Modifications [b]Thermal Control System (TCS):[/b] [list][*]liquid thermostatting of GN&CS OC devices is provided by installation of three cold plates in the vehicle instrument module (IM); [*]TCS strap-on radiator loop is modified to connect the cold plates in order to provide thermostatting of new devices of the guidance, navigation and control system, located in the instrument module; [*]electric pump unit of the increased capacity is installed in TCS strap-on radiator loop; [*]liquid-to-liquid heat exchanger is replaced in order to improve the vehicle liquid thermostatting at the launch site due to the incorporation in the vehicle of new devices requiring thermostatting.[/list] [b]Guidance Navigation and Control System:[/b] [list][*]automatic control unit of berthing and attitude thrusters (ACU BAT) is upgraded in order to provide compatibility with new onboard computers; [*]software for the vehicle descent module computers is upgraded.[/list] [b]Onboard Complex Control System (OCCS):[/b] [list][*]command processing unit and command matrix are upgraded in order to provide the given control logic of GN&CS and OMS devices incorporated; [*]circuit breakers in power switching units are replaced for power supply of GN&CS and OMS devices incorporated.[/list] [b]Cosmonaut Panel:[/b] [list][*]new software is introduced which consideres the command and signal data change during the onboard systems modernization.[/list] [b]Modifications of the Vehicle Structure and Interfaces with the ISS:[/b] [list][*]magnesium alloy of IM instrument frame is replaced by aluminum alloy to improve technological effectiveness; [*]duplicated multiplex channels are inserted for data exchange between the vehicle OC and the ISS Russian Segment OC.[/list] Modification Results [list][*]36 obsolete devices are replaced by 19 devices of new development; [*]OCCS and TCS are modified with regard to provision of control, power supply and thermostatting of new devices incorporated; [*]vehicle structure is additionally modified to improve the vehicle technological effectiveness; [*]mass of the vehicle structure is decreased by 70 kg that will allow to provide further upgrading of the vehicle operational capabilities.[/list]
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